帝国製鋲 List of Products and Services

♦P.C. Tie Rod Trapezoidal Screw Bolt♦ The "trapezoidal screw/bolt" for concrete ties is manufactured using the "hot-rolled rolling method," which offers superior strength compared to cutting processes. It has already been successfully used in numerous instances in the Shinkansen maintenance and can also be used for securing parts of civil engineering, such as the hanging sections of concrete walls in underground areas. ★Please feel free to consult us regarding other applications or prototypes. We also design "male threads." 【Features of the Hot-Rolled Rolling Method】 - Maintains the fiber structure of the steel, providing excellent strength - High precision with no eccentricity - Suitable for mass production - Custom products for irregular/trapezoidal screws are also available ♦Connection Plate Bolt and Nut♦ Standard steel connection plate bolts and heat-treated connection plate bolts. 【Features】 - Heat-treated connection plate bolts are produced in three grades: 5.6, 8.8, and 10.9 - Obtained JIS display permission (certification) ◆Prototype Forged Parts◆ If you provide us with drawings, we can design and prototype molds regardless of quantity! This allows for rough processing through forging, not only for bolts but also for complex shapes or when you want to reduce excess material in lathe processing. *For more details, please contact us or refer to the catalog.*

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Introducing the "High Strength Hex Bolt" from Teikoku Seibou, a manufacturer of fastening components related to large machinery and railways. In strength categories "8.8" and "10.9", we use machine structural alloy steel (SCM435) and low-carbon boron steel as materials. We offer a lineup of 9 sizes: M16, M20, M22, M24, M27, M30, M33, M36, and M39. 【Features】 ■ High strength is achieved through heat treatment, ensuring stable quality. ■ When combined with nuts, stable torque management is possible during tightening. *For more details, please refer to the materials. Feel free to contact us with any inquiries.

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At Teikoku Seibou Co., Ltd., we have been dedicated to each product with reliable technology and a trustworthy system. To further respond to the "next needs," we have developed a system that utilizes the characteristics of both hot and cold forging techniques cultivated up to today, allowing us to accommodate orders for standard bolts as well as special shapes and irregular bolts, regardless of the lot size. In the "21st Century Product Catalog," we include not only "company history," "JIS approved items," "production steel materials," and "main production and inspection equipment," but also a wide range of products such as "10.9 high-strength bolts," "10.9 hex socket bolts," "dog nails and stop nails," "rail screws," "rail fastening bolts," "gauge adjustment fittings," and "splice plate bolts." *For urgent or emergency inquiries, or for technical questions, please contact us directly through our website.

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At Teikoku Seibou Co., Ltd., we develop automation equipment for self-tapping screws and strive daily to improve our technology, producing better products at lower costs, and receiving support in various fields and areas. We have been manufacturing bolts, screws, and nails, which are essential for social infrastructure such as railways, construction, civil engineering, and shipbuilding, for a century. With the motto "We want to meet the next needs," the entire company is united in contributing to society and advancing into the future as "Teikoku Seibou, an old yet new company." In our "Business Introduction," we sincerely respond to user needs with "technical capabilities" backed by solid technology and a robust system, high productivity utilizing years of knowledge and experience in "production systems," and "quality control" that provides peace of mind through rigorous inspections. Additionally, in the "Product Lineup Introduction," we feature a variety of products including "dog nails," "gauge blocks," "long-headed studs," "SS bolts," "epoxy powder coating," "10.9 and 8.8 high-strength bolts," and "stainless steel hex socket bolts." *For urgent or emergency matters, or technical inquiries, please contact us directly through our website.

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At Teikoku Seibou, a leading company in rail fastening components, we handle "dog spikes" used for fastening rails to wooden and synthetic sleepers. The commonly used standard dog spike "Dog Spike (Standard) JISE-1108" was established as a JIS in 1990 and is available for general use and for N rails. In addition, we offer "Dog Spike (Round Head Spike)" for use with N rail switches (using wit screws), floor plates for expansion joints, and switch-type plates for fastening sleepers, as well as "Dog Spike (Square Head Spike)" for use with N rail switches (using metric screws) and floor plates for expansion joints and switch-type plates for fastening sleepers. 【Features】 <Dog Spike (Standard)> ■ The commonly used standard dog spike ■ Established as JIS in 1990 (JIS-E1108) ■ Available for general use and for N rails *For more details, please refer to the PDF document or feel free to contact us.

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At Teikoku Seibou, a leading company in rail fastening component manufacturing, we handle "rail screws." The intended uses are for fixing rails and fastening tie plates. To increase the pull-out resistance of the nails, we have cut threads. With the spread of synthetic sleepers, there are often cases where screws with thinner shaft diameters or smaller head diameters, as well as variations in shape depending on the usage location, are produced compared to conventional rail screws. Once we receive your drawings, we will start with mold design and proceed to manufacturing, so please feel free to consult us. 【Features】 ■ High precision and strong threaded parts due to hot rolling method ■ Thread cutting to increase the pull-out resistance of the nails ■ JIS mark certification product (JIS E1109) *For more details, please refer to the PDF materials or feel free to contact us.

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The "dog nail and trapezoidal screw" is shaped remarkably like a dog's head and can be used for a wide variety of purposes. Please get creative with its use as decorative elements for building exteriors or as hooks for hanging items. If you require it as a commemorative item, engraving text or dates is also possible. 【Features】 ■ Can be used as decorative elements for building exteriors or as hooks for hanging items ■ Engraving text or dates is also possible *For more details, please refer to the PDF document or feel free to contact us.

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At Teikoku Seibou, which has been producing bolts, screws, and nails essential for social infrastructure such as railways, construction, civil engineering, shipbuilding, and aircraft for about 100 years, we handle "joint plate bolts and nuts" used in railway applications. Our company manufactures ordinary steel joint plate bolts and heat-treated joint plate bolts based on JIS E1107 Appendix 1 (regulations) for Whitworth thread joint plate bolts and nuts. 【Types and Uses of Bolts】 ■ Type A - For 30kg (A30) rails: Ordinary joint plate - For 37kg (A37) rails: Ordinary joint plate - For 50kg (A50) rails: Ordinary joint plate ■ Type B - For 30kg (B30) rails: Heat-treated joint plate - For 37kg (B37) rails: Heat-treated joint plate - For 40kgN (B40N) rails: Ordinary joint plate/Heat-treated joint plate - For 50kg (B50) rails: Heat-treated joint plate - For 50kgN (B50N) rails: Ordinary joint plate/Heat-treated joint plate *For more details, please refer to the PDF document or feel free to contact us.

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The bolts for railway switches (points) are manufactured using a hot forging system. A variety of chock bolts and various shaped bolts related to signals and electrical components are produced using the hot forging system. We manufacture different types of screws, including metric screws and Whitworth screws (inch-based), according to customer requests. Based on our outstanding technical capabilities, we also produce a wide range of items. *For urgent or emergency cases, or for technical inquiries, please contact us directly through our website.

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Electrolytic corrosion is a phenomenon where metal rapidly dissolves due to the flow of electricity from natural phenomena on the surface of the metal. Iron structures are painted, and these paints contain a lot of zinc, which provides rust prevention effects. However, there are many areas of corrosion on bolts that have been hot-dip galvanized and are subjected to repeated wetting and drying, or are located in humid environments. To help address these issues, we also sell bolts that have been treated with coatings such as nylon-based and epoxy-based. *For urgent or emergency cases, or for technical inquiries, please contact us directly through our website.*

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High-strength hex bolts (M12 to M30), which are actively used in steel frame and bridge construction, are one of our main products. High-strength hex bolts play an important role as components for construction machinery, supporting the future of the construction industry. We use special steel materials for high-strength hex bolts, such as low-carbon manganese, chromium, and boron steel, ensuring stable mechanical properties of the products. Our consistent production process, utilizing advanced bolt forming equipment (for diameters of 27mm or less), guarantees stable quality. Leveraging years of experience in hot forging technology, we also manufacture large-diameter high-strength hex bolts (M33 to M76). We mass-produce products with stable quality through strict lot management based on JIS B1186. We maintain a rich inventory of standard products and respond quickly to orders. *For urgent or emergency inquiries, or technical questions, please contact us directly through our website.

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Stainless steel is excellent in design, corrosion resistance, and durability, and has been widely used in various fields for a long time. High-strength hex bolts used for stainless steel structural materials are regulated by JIS B1186 "Set of High-Strength Hex Bolts, Hex Nuts, and Flat Washers for Friction Joints." However, since the chemical composition and manufacturing methods of the material are not specified here, high-strength hex bolts made of stainless steel are manufactured based on the standards of the Stainless Steel Structural Engineering Association, SSBS301 "Set of High-Strength Hex Bolts, Hex Nuts, and Flat Washers for Structural Stainless Steel" (10T-SUS, 10-SUS, 35-SUS). *For urgent or emergency cases, or for technical inquiries, please contact us directly through our website.

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The high-strength hex bolts with hot-dip galvanized coating from Teikoku Seibou Co., Ltd. have undergone examination based on the Building Standards Act regarding corrosion resistance, mechanical properties, tightening function, delayed fracture characteristics, and construction performance, and have obtained general certification from the Minister of Land, Infrastructure, Transport and Tourism. The coating weight of the bolts, nuts, and washers is over 550g/m². Furthermore, the coating weight of the components is managed under the same standards, ensuring maintenance-free corrosion resistance over the long term. In the zinc plating process, we avoid pickling as much as possible to prevent hydrogen intrusion, eliminating concerns about delayed fracture. The nuts are treated with a special lubrication process, guaranteeing stable axial force during tightening construction using the nut rotation angle method. *For urgent or emergency cases, or for technical inquiries, please contact us directly through our website.*

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TM truss bolts are used in the spherical joint sections of the TM spatial truss (by Taiyo Kogyo Co., Ltd.), which creates an ideal space without columns. TM bolts are made from chromium-molybdenum steel (SCM435) and nickel-chromium-molybdenum steel (SNCM439), heat-treated to achieve high strength using advanced heat treatment equipment. Additionally, they undergo special corrosion-resistant treatment to prevent delayed fracture. Teikoku Seibou Co., Ltd. can provide high-quality, high-strength, and corrosion-resistant treatment for bolts of various sizes (with a maximum neck length of 1,000 mm). *For urgent or emergency inquiries, or technical questions, please contact us directly through our website.

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The production of drift pins requires advanced heat treatment technology. If heat treatment management is insufficient, issues such as chipping or bending of the pins may occur. At Teikoku Seibyo Co., Ltd., we manufacture drift pins with excellent heat treatment technology and strict steel selection, earning immense trust from our customers. *For urgent or emergency cases, or for technical inquiries, please contact us directly through our website.*

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There are two types of hexagon head bolts based on the size of the width across the flats: 1. Standard hexagon bolts (regular hexagon bolts), and 2. Small hexagon bolts (hexagon bolts with a head width across the flats smaller than that of standard ones). The applicable strength grades are 4.6, 8.8, and 10.9. Teikoku Seiko Co., Ltd. can manufacture bolts of all sizes according to user needs. Additionally, since October 1993, Teikoku Seiko Co., Ltd. has been producing high-strength hexagon bolts with a diameter of 10.9 (JIS standard) using advanced heat treatment technology that leverages hot forging technology (with a maximum shank length of 1,000 mm possible). *For urgent or emergency inquiries, or for technical questions, please contact us directly through our website.

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Hexagon socket head bolts are generally used without nuts, so the term "screw" is more accurate. However, since the name "hexagon socket bolt" has become widespread, they are also referred to as cap bolts. The applicable strength grades are 8.8, 10.9, and 12.9. They are tightened with a hexagon rod wrench (with a maximum shank length of 1,000 mm). Compacting of devices. Improvement of equipment design performance. Application in narrow spaces and enhanced workability. Increased reliability due to prevention of loosening with high tightening force. *For urgent or emergency cases, or for technical inquiries, please contact us directly through our website.*

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The stainless steel bolts manufactured by Teikoku Seibou Co., Ltd. are produced based on years of accumulated technology and achievements. All products are made to order. The manufacturing process includes hot forging, solution treatment, NC cutting, thread rolling, and surface treatment, all carried out under strict quality control and with extensive experience in each process. The range of thread rolling is wide, accommodating small to large diameters, meeting all kinds of needs (with a maximum neck length of up to 1,000mm). *For urgent or emergency inquiries, or technical questions, please contact us directly through our website.

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Teikoku Seibou Co., Ltd. has been dedicated to each and every task with reliable technology and a trustworthy system. Furthermore, in order to respond to the "next needs," we have established a system that leverages the characteristics of the hot and cold forging technologies we have cultivated up to today, enabling us to accommodate all types of orders. Whether it’s standard bolts or special shapes and irregular bolts, please feel free to reach out with any inquiries or requests for quotes, regardless of the quantity, including questions like "Can you make something like this?" or "Can it be produced more economically?" *For urgent or emergency matters, or technical inquiries, please contact us directly through our website.

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The "pure titanium" and "titanium alloy" forging services from Teikoku Seibou are top-class services for forging, cutting, and screw processing of titanium, a non-ferrous metal that is lightweight and strong, meaning it has a high tensile strength value per unit density. Due to its excellent corrosion resistance and heat resistance, it has the advantage of being usable in harsh environments. *For urgent or emergency inquiries, or technical questions, please contact us directly through our website.

• Processing Contract

The "Large Machine Hex Bolt" from Teikoku Seibou is a hex bolt made from chromium-molybdenum steel (SCM435, 440) and nickel-chromium-molybdenum steel (SNCM439). 【Features】 ◆ The high strength is achieved through advanced heat treatment equipment, ensuring stable quality. ◆ When combined with nuts, it allows for stable torque management during tightening. ◆ The hex head bolts are available in two types based on the width of the two flat sides: - Standard hex bolt (regular hex bolt) - Small hex bolt (hex bolt with a head width smaller than that of the standard hex bolt) - Applicable strength classifications are 4.6, 8.8, 10.9. *For urgent or emergency inquiries, or technical questions, please contact us through our website.

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"High-strength hex bolts 8.8 and 10.9" are large bolts ranging from M30 to M60, finished through hot forging. Despite their large size, they achieve high strength classified as 8.8 or 10.9 according to JIS standards. Customization is possible for special dimensions in length and thickness, as well as for changes in head shape to special forms. ◎ Prototyping is also possible upon request. 【Features】 ■ Customization for special dimensions and shapes is available ■ Used in machine tools, wind power generation, and various construction materials ■ Made of alloy steel and low-carbon boron steel *For urgent or emergency inquiries, please contact us through our website for technical questions.

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The "stainless steel high-strength hex bolt" is a material that excels in design, corrosion resistance, and durability, and has been widely used in various fields for a long time. Customization to special shapes with unique dimensions in length and thickness, as well as changes to the shape of the head, is possible. ◎ Various stainless steel bolts can also be manufactured according to your requests. 【Features】 ■ Manufactured under strict quality control with abundant experience in all processes ■ Customization to special dimensions and shapes is possible ■ The range for rolling is wide, from small diameters to large diameters (maximum underhead length of 1,000mm is possible) *For urgent or emergency inquiries, or technical questions, please contact us directly through our website.

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The production of dog spikes has walked alongside Japan's long railway history. Even today, they are highly regarded both domestically and internationally for use in securing rails for wooden and synthetic sleepers. "Dog spike (standard)" is defined as JIS and comes in general and N-rail types. The N-rail type "dog spike (round head)" is used for securing sleepers in turnouts, expansion joints, and turnout-type plates, while the "dog spike (square head)" is also available for securing sleepers in turnouts and expansion joint floor plates. 【Features】 ○ General use - The angle under the head is 13° ○ N-rail use - The angle under the head is 1:10 ○ Square head spike - The angle under the head is 1:6 - Designed considering the shortcomings of the round head spikes listed below. *For urgent or emergency inquiries, please contact us through our website for technical questions.

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The "rail screw nail" is a screw that has been threaded to increase the resistance to pull-out of the nail. Its purpose is the same as that of a dog nail, which is to secure the rail and tie plate. With the widespread use of synthetic sleepers, there are many cases where screws with thinner shaft diameters or smaller head diameters than conventional rail screw nails are manufactured in different shapes depending on the application. Upon receiving the drawings, our company will start with the design of the mold and proceed with manufacturing. 【Features】 ○ Provides a higher fastening force to wood and synthetic sleepers, making it less likely to loosen. ○ Has a high-precision and strong screw section due to the hot rolling method. *In urgent cases, please contact us through our website for technical inquiries.

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"Joint plate bolts and nuts" refer to ordinary steel joint plate bolts and heat-treated joint plate bolts. Our company manufactures these based on JIS E1107 for Whit threads in joint plate bolts and nuts. JIS E1107, E1113, and E1114 have been integrated and announced as the new JIS E1107. 【Features】 ○ Heat-treated joint plate bolts are produced in three types: 5.6, 8.8, and 10.9 ○ Obtained JIS display permission (certification) *For urgent or emergency inquiries, please contact us through our website for technical questions.

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The "PC sleeper trapezoidal screw bolt" is a bolt that fastens the rail to a sleeper embedded with a synthetic resin plug that serves as the female thread, using a spring. Our company manufactures the threaded part of the bolt using a hot rolling method. As a result, unlike cutting methods, the fiber structure of the steel material is maintained without being severed. It has been adopted in many new shinkansen lines, including the Sanyo Shinkansen. 【Features of the hot rolling method】 - Excellent strength due to the intact fiber structure - High precision with no eccentricity - Suitable for mass production - Custom products for various shapes and trapezoidal threads are also available - Thread processing for special steel and stainless steel is possible *For urgent or emergency inquiries, please contact us through our website for technical questions.

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"Hex bolts (4.6 to 12.9)" are bolts used in large machinery, civil engineering, and shipbuilding. Hex head bolts come in two types based on the width across the flats: standard hex bolts and small hex bolts. Our company can manufacture bolts of all sizes according to user needs (with a maximum shank length of 1,000mm). 【Features】 ○ Hex bolts (8.8, 10.9) are made from chromium-molybdenum steel (SCM435, 440) and nickel-chromium-molybdenum steel (SNCM439). ○ The use of advanced heat treatment equipment ensures high strength and stable quality. ○ When combined with nuts, stable torque management during tightening is possible. ○ Applicable strength grades: 4.6, 6.8, 8.8, 10.9, 12.9. *For urgent or emergency inquiries, please contact us through our website for technical questions.

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The "hex bolt (6.8)" is a bolt used in large machinery, civil engineering, and shipbuilding. Hex head bolts come in two types based on the width across the flats: standard hex bolts and small hex bolts. In addition to hex bolts (6.8), we also offer hex bolts (4.6, 8.8, 10.9, 12.9). Our company can manufacture bolts in various sizes according to user needs. (The maximum length of the neck can be up to 1,000mm.) 【Features】 - The quality is stable due to high-strength tempering with advanced heat treatment equipment. - By combining with nuts, stable torque management during tightening is possible. *For urgent or emergency inquiries, please contact us through our website for technical questions.

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"Hex bolts (8.8, 10.9)" are bolts used in large machinery, civil engineering, and shipbuilding. Hex head bolts come in two types based on the width across the flats: standard hex bolts and small hex bolts. Our company can manufacture bolts of all sizes according to user needs (with a maximum shank length of 1,000 mm). 【Features】 ○ Hex bolts (8.8, 10.9) are made from chromium-molybdenum steel (SCM435, 440) and nickel-chromium-molybdenum steel (SNCM439). ○ They are heat-treated with advanced equipment for high strength, ensuring stable quality. ○ When combined with nuts, they allow for stable torque management during tightening. *For urgent or emergency inquiries, please contact us through our website for technical questions.

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The "Hexagon Socket Bolt JISB1176" is a bolt used in large machinery, civil engineering, and shipbuilding. Hexagon socket head bolts are generally used without nuts. The applicable strength grades are 8.8, 10.9, and 12.9. They are tightened with a hexagon rod wrench (with a maximum shank length of 1,000 mm). Our company has established a system that leverages the characteristics of hot and cold forging technology to accommodate all orders. 【Features】 ○ Compact design of equipment ○ Improved design performance of devices ○ Application in narrow spaces and enhanced workability ○ Increased reliability through prevention of loosening with high tightening force *For urgent or emergency inquiries, please contact us via our website for technical questions.

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"Hot-dip galvanized high-strength bolts" are bolts used for construction machinery. High-strength hex bolts (M12 to M30), which are active in steel frame and bridge construction, are also one of the main products. The use of special steel materials for high-strength hex bolts, such as low-carbon manganese, chromium, and boron steel, ensures stable mechanical properties of the products. We have a rich inventory of standard products and will respond quickly to your orders. 【Features】 ○ Utilizing state-of-the-art equipment for bolt forming (φ27mm or less) for consistent production, ensuring stable quality. ○ Leveraging years of experience in hot forging technology, we also manufacture large-diameter high-strength hex bolts (M33 to M76). ○ Mass production of products with stable quality through strict lot management (based on JIS B1186). *For urgent or emergency inquiries, please contact us through our website for technical questions.

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Titanium can be broadly classified into "pure titanium" (there are four types according to JIS) and "titanium alloys." "Pure titanium" refers to commercially high purity, and is also abbreviated as CP titanium (Commercially Pure Titanium). Titanium alloys are divided into those primarily aimed at improving "corrosion resistance" and those aimed at enhancing "mechanical strength" and "workability." 【Features】 ○ Lightweight and strong titanium alloys ○ Excellent corrosion resistance ○ Excellent heat resistance *In case of urgent or emergency situations, please direct technical inquiries through our website.

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As a leading company in the rail fastening component manufacturing industry, we have been dedicated to the development of unique automation equipment and the improvement of technology, allowing us to produce better products at lower costs. We would like to introduce the forging technology of Teikoku Seibou. With our expertise in forging technology, we assist companies in various industries, including JR companies, municipal transportation bureaus, and private railways, in bringing their products to market. *For more details, please download the catalog. *For urgent matters or technical inquiries, please contact us directly through our website.

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Teikoku Seibou Co., Ltd. is a fastener manufacturer that has both hot and cold forging equipment, utilizing the characteristics of each to support many companies with standard bolts, as well as irregular bolts and special steel bolts, regardless of the lot size. Additionally, we are equipped with processing facilities that can consistently handle post-processing of bolts. We respond to various fastener needs. We are offering a DVD that introduces our forging technology for free. The DVD provides an overview of hot and cold forging techniques. *Companies wishing to receive the "DVD" should contact us and specify "DVD request" in their inquiry. *For urgent matters or technical questions, please contact us directly through our website.

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Stainless steel bolts are manufactured based on years of our accumulated technology and achievements. Additionally, there are processes such as hot forging, solution treatment, NC cutting, thread rolling, and surface treatment, all of which are carried out under strict quality control and with extensive experience. The range of rollable diameters is wide, from small to large, catering to all kinds of needs. *For urgent or emergency inquiries, please contact us through our website for technical questions.

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In addition to standard bolts, we have established a system to respond to various orders by leveraging the characteristics of our hot and cold forging technologies that we have developed up to today, in order to meet the "next needs" for special items, irregular shapes, and forged products. For forged parts and irregular items, regardless of the quantity, please feel free to reach out with inquiries such as "Can you make something like this?" or "Is there a more economical way to produce this?" for consultations and estimates. *For urgent or emergency cases, please contact us through our website for technical inquiries.

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We would like to introduce our "Hex Bolts," which are heat-treated to high strength and possess stable quality. There are two types of hex head bolts based on the width across flats. The applicable strength grades are 4.6, 8.8, and 10.9. At Teikoku Seiko, we can manufacture bolts in various sizes according to user needs. Additionally, since October 1993, we have been producing high-strength hex bolts with a diameter of 10.9 (JIS standard) using advanced heat treatment technology that leverages hot forging techniques (with a maximum shank length of 1,000 mm). 【Features】 ■ Hex bolts (8.8, 10.9) are made from chromium-molybdenum steel (SCM435, 440) and nickel-chromium-molybdenum steel (SNCM439). ■ The high-strength heat treatment performed with our state-of-the-art equipment ensures stable quality (8.8, 10.9). ■ When combined with nuts, stable torque management during tightening is possible. ■ JIS mark certification (JIS B1180). *For more details, please refer to the PDF document or feel free to contact us.

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Hexagon socket bolts (caps) are generally used without being paired with nuts, so referring to them as screws is more accurate. However, since the name hexagon socket bolt has become widespread, they are also referred to as cap bolts. The applicable strength grades are 10.9 and 12.9. They are tightened with a hexagonal rod wrench (with a maximum length of 1,000 mm possible). *For urgent or emergency situations, or for technical inquiries, please contact us directly through our website.

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Special products, irregular products, and wit screws have established a system that leverages the characteristics of our hot and cold forging technology, cultivated up to today, to respond to the "next needs." We are prepared to accommodate all orders, not only for standard bolts but also for irregular products and irregular bolts, regardless of the quantity. Please feel free to reach out with inquiries such as "Can you make something like this?" or "Is there a more economical way to produce it?" for consultations and estimates. *For urgent or emergency cases, please contact us with technical questions through our website.

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Stainless steel is excellent in design, corrosion resistance, and durability, and has been widely used in various fields for a long time. At Teikoku Seibou, we manufacture "stainless bolts" based on years of accumulated technology and achievements. The range of rollable diameters is broad, from small to large sizes, meeting various needs (with a maximum neck length of 1,000mm possible). All products are made to order. 【Features】 ■ All products are made to order ■ Manufactured under strict quality control and with extensive experience in all processes including hot forging, solution treatment, NC machining, thread rolling, and surface treatment ■ The rollable range is broad, from small to large diameters (with a maximum neck length of 1,000mm possible) *For more details, please refer to the PDF document or feel free to contact us.

• bolt
• stainless

Stainless steel bolts are manufactured based on years of our accumulated technology and achievements. Additionally, there are processes such as hot forging, solution treatment, NC cutting, thread rolling, and surface treatment, all carried out under strict quality control and with extensive experience in each process. The range of rollable diameters is wide, from small to large, meeting all kinds of needs. *For urgent or emergency inquiries, please contact us through our website for technical questions.

• nut

Hexagon socket bolts (caps) are generally used without being paired with nuts, so referring to them as screws is more accurate. However, since the name hexagon socket bolt has become widespread, they are also called cap bolts. The applicable strength grades are 8.8, 10.9, and 12.9. They are tightened with a hexagon rod wrench (with a maximum shank length of 1,000 mm). *In urgent or emergency cases, please direct any technical inquiries through our website.

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High-strength hex bolts (M12 to M30) are actively used in steel frame and bridge construction. 【Features】 - Coated with a surface treatment to prevent rust in highly corrosive environments such as coastal and offshore areas. - Made from special steel materials (developed by Sumitomo Metal Industries, Ltd.) such as low carbon manganese, chromium, and boron steel, ensuring stable mechanical properties of the products. - Utilizing advanced equipment for bolt forming (up to φ27mm), we conduct consistent production, ensuring stable quality. - Leveraging years of hot forging technology, we also manufacture high-strength hex bolts (M33 to M76). - We mass-produce products with stable quality through strict lot management based on JIS B1186. - We maintain a large inventory of standard products and respond quickly to orders. *For urgent or emergency inquiries, please contact us through our website for technical questions.

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• bolt

At Teikoku Seibou, a leading company in rail fastening component manufacturing, we handle "dog spikes and rail screws." "Dog spikes" are used for fastening rails to wooden and synthetic sleepers. In addition to the commonly used standard dog spike "Dog Spike (Standard) JIS-E1108," we offer dog spikes (round head) and dog spikes (square head) in our lineup. "Rail screws" are used for securing rails and fastening tie plates, and we provide types A, B, and C according to the application. 【Features of Dog Spike (Standard)】 ■ Currently widely used standard dog spike ■ Available for general use and N rails (the difference is the angle under the head of the dog spike) ■ Certified product under the JIS mark display system (JIS E1108) *For more details, please refer to the PDF document or feel free to contact us.

• nut
• Other machine elements