Last Updated： Aggregation Period:Sep 16, 2026～Oct 13, 2026
This ranking is based on the number of page views on our site.
Last Updated： Aggregation Period:Sep 16, 2026～Oct 13, 2026
This ranking is based on the number of page views on our site.
Last Updated： Aggregation Period:Sep 16, 2026～Oct 13, 2026
This ranking is based on the number of page views on our site.
571～600 item / All 1147 items
Safety design that meets the high hiring standards of major companies. Can rotate under load. Passed 20,000 uses at a load 1.5 times the working load.
Safety factor of 5 times. Side lifting, inversion, and pulling up are possible during loading. Passed 20,000 usage tests.
The screw sizes available include M36, M42, M48, M56, M64, M72, and many more!
We would like to introduce the "Hex Bolts (Partially Threaded)" that we handle. The materials available are iron, SNB7, brass, stainless steel, SUS316, SUS316L, SUS310S, aluminum, and titanium. We offer a range of thread sizes from M3 to M80. Please feel free to contact us if you have any requests. 【Thread Sizes (Partial)】 ■M3 ■M4 ■M5 ■M6 ■M8 *For more details, please feel free to contact us.
Cap screws made of materials such as SUS316L, SUS310S, SUS430, titanium, and 64 titanium!
We would like to introduce the "Hex Socket Bolts" that we handle. The screw sizes range from M1.4 to M42. The materials available include iron, stainless steel, SUS316L, SUS310S, SUS430, aluminum, titanium, and 64 titanium. Please feel free to contact us if you have any requests. 【Screw Sizes (Partial)】 ■M1.4 ■M1.6 ■M2.5 (M2.6) ■M3 ■M4 *For more details, please feel free to contact us.
Lightweight, non-magnetic, and highly corrosion-resistant. Prototype arrangements are also possible. Cost reduction through trading company routes during mass production.
It is suitable for harsh usage conditions such as precision machinery, marine and chemical fields, and ultra-low temperature environments. Its specific gravity is 4.51, achieving about 60% of the weight of iron. In addition to preventing magnetic interference due to its complete non-magnetic properties, it exhibits excellent corrosion resistance that surpasses stainless steel due to its strong oxidized surface, making it resistant to seawater and chemicals. 【Convenience of Procurement】 During the prototype and verification stages, arrangements can be made immediately from just one piece. When transitioning to mass production, we utilize our unique procurement routes as a specialty screw trading company to efficiently source equivalent products that meet design specifications. We aim to optimize costs and delivery times.
Ideal shape that is hard to loosen - ActiveX
The unique shape that creates a cavity in the flange section absorbs vibrations, which are the cause of screw loosening, allowing for high fastening strength. It maintained high fastening strength without loosening for 17 minutes during the NAS3350 standard vibration test. Loosening prevention measures can be implemented simply by changing the bolts, without the need for specialized bits or additional locking materials. Furthermore, it is not necessary to change all bolts, washers, and nuts; simply changing any one of them to ActiveX will demonstrate effectiveness.
We can establish wireless communication even in harsh on-site environments.
The Anybus Wireless Bolt can provide a wireless interface for devices such as PLCs and HMIs. It can be installed on control panels and equipment (such as machine tools, packaging machines, and semiconductor manufacturing equipment) to connect Ethernet or serial communication wirelessly. The wireless communication methods are WLAN and Bluetooth. Additionally, it is possible to use your PC, tablet, or smartphone as an HMI. The top of the unit is rated IP67, making it excellent for dust and water resistance.
No need for counterbore processing! Ideal for areas where you want to minimize the protrusion of the screw head or reduce weight.
The "Ultra Low Head CAP" is a hex socket bolt with an even lower head than a low head bolt. It is suitable for areas where you want to minimize the protrusion of the screw head or reduce weight. Since countersinking is not required, it allows for a reduction in work processes and time. We can also accommodate various additional processing requests as needed. 【Features】 ■ Head height is even lower compared to low head CAP ■ No countersinking required, minimizing head protrusion ■ Additional processing such as various surface treatments and anti-loosening treatments is also available *For more details, please refer to the related links or feel free to contact us.
![[Technical Information] The Mechanism of Super Bolts and the Principle of Preventing Breakage](https://image.mono.ipros.com/public/product/image/e9e/2000890558/IPROS12338474004561614480.png?w=280&h=280)
A bolt tensioner that can be tightened with just hand tools! A bolt that ensures reliable axial force.
This document introduces the reduction of the risk of fracture for super bolts. It explains the causes of fracture in large-diameter bolts and provides a detailed explanation of the process of generating axial force in super bolts and the absence of torsional stress. Our company has a dedicated support department. Please make use of it for product selection. [Contents] ■ What is a super bolt ■ Main causes of fracture in large-diameter bolts ■ Reducing fracture risk with super bolts ■ Summary *For more details, please refer to the PDF document or feel free to contact us.
![[Case Study] Cost Reduction through Changes in the Manufacturing Method of Mass-Produced Screws](https://image.mono.ipros.com/public/product/image/90e/2000999157/IPROS26112908317921160821.png?w=280&h=280)
A case where the manufacturing method was changed from cutting processing to forging processing, resulting in a 70% cost reduction in the customer's purchase price.
We would like to introduce a case where we proposed "reducing the manufacturing process and increasing production lots" to an industrial machinery manufacturer. The customer was purchasing low-head type special-shaped hexagon socket bolts M2 from an e-commerce site, but due to high unit prices and an increasing quantity needed, they expressed a desire to reduce costs. We proposed a change in the manufacturing method, which was adopted without any issues and was equivalent to or better than the conventional products, resulting in significant cost reductions. [Case Overview] ■ Issues - Costs had become excessively high - The shape was not particularly difficult to manufacture, despite being outside JIS standards ■ Requirements for Solving the Issues - Reduction of costly machining processes - Establishing a production lot that ensures stable lead times *For more details, please refer to the related links or feel free to contact us.
![[Case Study] Coating the Head of a Left-Hand Thread Hex Socket Bolt](https://image.mono.ipros.com/public/product/image/bbe/2000999175/IPROS61313075676963499293.png?w=280&h=280)
Production completed in time for the desired delivery date! A case of proposing alternatives for discontinued products from the manufacturer.
We would like to introduce a case where we proposed an alternative for a left-handed hex socket bolt that has been discontinued by the manufacturer and is no longer available in the market for a textile machinery manufacturer. The M3×7 uncoated hex socket bolt (left-handed) used in textile machinery was discontinued, and without finding an alternative product, the production line would come to a halt, impacting sales. We proposed machining the dimensions of the left-handed hex socket bolt and painting the head, allowing for the selection of right-handed and left-handed screws without changing the screw size, and we were able to deliver the product by the desired deadline. [Overview of the Issue] - The M3×7 uncoated hex socket bolt (left-handed) was used in textile machinery, but production by the manufacturer has ended, and it has been discontinued. - If an alternative product cannot be found, the production line will stop, affecting sales. *For more details, please refer to the related links or feel free to contact us.
![[Case Study] Investigation and Measures for Causes of Loosening](https://image.mono.ipros.com/public/product/image/d1e/2000999176/IPROS20880013365007596894.png?w=280&h=280)
A case study proposing investigation and countermeasures for the loosening of embedded bolts used to secure tire wheels.
We would like to introduce a case where we proposed the identification of the cause of loosening and permanent countermeasures through hypothesis establishment and dimensional inspection using an image measurement device for an industrial vehicle manufacturer. There was an issue where the embedded bolts used to secure the tire wheels of forklifts were falling off after being delivered to the customer. We shared knowledge regarding the threaded parts' dimensional measurement using the image measurement device and proposed clearly stating tolerances on the drawings to ensure accurate communication of information among design, quality control, procurement, and suppliers. [Overview of the Issue] ■ The embedded bolts used to secure the tire wheels of forklifts were falling off after being delivered to the customer. ■ If they fall off while in operation, it could lead to a serious accident, so it must be resolved urgently. *For more details, please refer to the related links or feel free to contact us.
![[Technical Column] Do you know the difference between implant bolts and double-ended bolts?](https://image.mono.ipros.com/public/product/image/4b8/2001076428/IPROS88895185154833002507.png?w=280&h=280)
Actually different! I summarized the specific differences between "insert bolts" and "double-threaded bolts."
The embedded bolt and the double-ended bolt both lack heads and have threads cut on both ends, and they are sometimes thought to be the same product, but in fact, they are different items. Recently, I received a consultation stating, "There was a loosening in the double-ended bolt that is securing the machine." It seems that the person was not aware that the effective diameter of the threaded part on the embedded side of the embedded bolt is slightly thicker, which caused the loosening. If such an issue is discovered after mass production, it can lead to serious problems. To prevent this, let's recognize the differences between the "embedded bolt" and the "double-ended bolt." *For more details on the column, you can view it through the related link. Please feel free to contact us for more information.*
![[Technical Column] Causes of Failure in Large Diameter Bolts Over M30](https://image.mono.ipros.com/public/product/image/0a5/2001076437/IPROS11740370992873478770.png?w=280&h=280)
Causes of thick diameter bolts breaking! Explanation of countermeasures using a product called Super Bolt.
I believe that large-diameter bolts are often used for securing components such as tie rods and cover bolts for pressure vessels. Have you ever experienced a large-diameter bolt breaking? When a bolt breaks, it requires a lot of effort to address the issue, and in some cases, it can halt the machinery, resulting in loss costs. In this column, we will explain the causes of large-diameter bolt breakage and the countermeasures using a product called Superbolt. *You can view the detailed content of the column through the related links. For more information, please feel free to contact us.*
Packed with information on the basic structure of screws and helpful tips for product selection! Technical materials are available to assist with component selection during product manufacturing!
Understand in 3 minutes! Technical materials on screws are available for download! Please feel free to download and take a look. ■ Screw Encyclopedia We have compiled products that are relatively commonly used in the market. ■ Overview of Resins Used for Plastic Screws - Overview of resin materials - Characteristics of each type - Mechanical properties by type of resin - List of physical properties of resin materials - List of chemical resistance of resins ■ Differences Between Embedded Bolts and Double-Ended Bolts We have summarized the tolerances for "length" and "thread length," which are particularly prone to causing trouble when using embedded bolts and double-ended bolts, according to the standards for embedded bolts (JIS B 1173) and the tolerances for fastening components (JIS B 1021). - Comparison table of differences between embedded bolts and double-ended bolts - Standards for embedded bolts (JIS B 1173) - Tolerances for fastening components (JIS B 1021) - How much difference is there between JIS B 1173 and JIS B 1021? *For more details, please refer to the PDF materials or feel free to contact us.
Construction-related products High-strength hex bolts
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.
It is manufactured under strict quality control with extensive experience in all processes.
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.
Free DVD giveaway of "Forging Technology" from Teikoku Seiko, supporting social infrastructure!
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.
Introducing the know-how of forged products essential for the development of infrastructure such as railways, civil engineering, shipbuilding, and construction! Get a free booklet now!
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.
We offer screws with high precision and strong threaded parts using the hot rolling method!
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.
Numerous shock bolts and various shaped bolts related to signals and electricity.
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.
Bolts treated with coatings such as nylon-based and epoxy-based.
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.*
High-strength hex bolts, which are active in steel frame and bridge construction, are also one of our main products.
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.
It has excellent design, corrosion resistance, and durability, and is widely used in various fields.
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.
High quality, high strength, and corrosion-resistant treatment is available for bolts of various sizes.
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.
We can manufacture bolts of all sizes according to user needs.
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.
It is manufactured under strict quality control with extensive experience in all processes.
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.
With reliable technology and a trustworthy system, we have carefully worked on each and every one.
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.
High-strength tempering with advanced heat treatment equipment! Hex bolts for large machinery.
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.
For general sections, laying sections, and frozen sections! Spikes for fastening sleepers.
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.
High fastening strength! Screws for rails that are resistant to loosening.
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.
