小原歯車工業 List of Products and Services

"GRSW" is software that allows for easy and speedy selection of rack and pinion systems simply by entering the usage conditions. It can also create additional machining drawings, enabling integration into assembly drawings or direct request for quotations. This software is useful for those who have struggled with selecting rack and pinion systems, those seeking to improve selection efficiency, and those considering adoption in the future. 【Features】 ■ Easy and speedy selection by simply entering usage conditions ■ Selection of desired rack and pinion from standard products ■ Immediate access to drawings and strength calculations for selected rack and pinion ■ Ability to create additional machining drawings for selected rack and pinion, allowing for integration into assembly drawings or direct request for quotations *For more details, please refer to the PDF document or feel free to contact us.

• Other information systems

Our company has developed a series of finished fastening gears that are custom-processed from standard gears according to our unique specifications. We can provide high-quality products with short delivery times through our JIT production line, thanks to our abundant inventory. 【Product Lineup Introduction】 ＜Key Fastening Gears J Series＞ 　■ Based on standard gears with pre-drilled holes, we custom-process the hole diameter, keyway, and mounting hole dimensions. 　■ Many large items with a module of 4 or higher. ＜Bushing-integrated Friction Fastening Gears F Series＞ 　■ Based on standard gears with pre-drilled holes, we custom-process bushing-integrated gears. 　■ Reduces play between the shaft and gear during fastening. ＜Pinions for Servo Motor Reducers R Series＞ 　■ Custom-processing of mounting holes for various flange-type reducers. 　■ High rigidity prevents gear deflection, making it suitable for rack and pinion applications. ＜Bushing-integrated Friction Fastening Gears E Series＞ 　■ Easily attachable to the shaft with a single bolt using ETP-E Plus. 　■ High precision with a concentricity of 0.02mm, resulting in zero backlash between the shaft and gear. *For more details, please refer to the materials. Feel free to contact us with any inquiries.

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The stainless steel boss assembled with PSA plastic spur gear has been made into the J series. No processing drawings are required for the stainless steel boss and PSA plastic gear for assembly. This alleviates concerns about the strength of the keyway in the plastic gear. The plastic spur gear with stainless steel boss can be completed within 2 working days (excluding the order date) after receiving the order, based solely on the catalog symbol.

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• Food Processing Equipment

Standardizing JIS Class 0 ground spiral bevel gears. The material used is SCM415, with the tooth part subjected to carburizing and quenching, achieving high strength, high precision, durability, and the highest level of quietness perfected by KHK technology. With the introduction of the state-of-the-art grinding machine 280HG and the gear measuring machine 350GMS, we can now process high-precision ground spiral bevel gears in a short time by combining a three-dimensional measuring machine and a tooth surface grinding machine. Carburization prevention is applied to all parts except the tooth section, and all machining reference surfaces are finished with polishing for easy centering and precision maintenance. The outer end tooth tip diameter is flattened for easier chucking, ensuring stable additional machining accuracy. We have an immediate delivery system for stock products ranging from module 2 to 4, and we can also accommodate custom gears outside of standard specifications. These gears can be widely used as components in high-speed rotating parts of machine tools, precision feeding mechanisms, and robot joints.

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Using the ETP-E Plus hydraulic shaft locking bush manufactured by Miki Pulley Corporation. The hydraulic shaft locking bush ETP-E Plus is adopted for SSG gear ground spur gears, KHG gear ground helical gears, etc., allowing for easy installation onto the shaft with just one bolt in 19 seconds. The backlash between the shaft and the gear is zero, and the concentricity is highly precise at 0.02mm. This significantly reduces the number of work steps and contributes to shortening lead times. Positioning is easy and flexible, and centering work is unnecessary.

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Standardization of aluminum frame transport devices in collaboration with SUS Corporation. This unit allows customers considering rack and pinion transport to use it with confidence without spending time on design and verification. It is also adopted by Hasegawa Machinery Co., Ltd., a manufacturer of lathes and machining tools. It is superior in load capacity, speed, long length, and dust resistance compared to ball screws and belt types, and it offers excellent balance. ■ Product Features 1. Can be freely designed within a maximum stroke of 3800 mm. 2. Capable of transporting a wide range of items from lightweight to heavy loads. 3. Delivery time for transport device examples is 30 working days (consultation required for specification changes). ■ Standard Specifications RU-800 Stroke: 800 mm RU-1300 Stroke: 1300 mm RU-1800 Stroke: 1800 mm RU-3800 Stroke: 3800 mm * The stroke range can be manufactured from 500 mm to 3800 mm. Length adjustments are made in 100 mm increments.

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In November 2024, we published the new comprehensive catalog "KHK2025." We have significantly expanded the lineup of standard gear specifications, including the J series and hardened plus, and enhanced the fastening series tailored to applications, such as the F, R, and E series. Additionally, QR codes are included for each item, allowing access to the web catalog on our website! We hope you will make full use of this new catalog linked with the web. If you would like to receive a printed catalog, please contact us using the "Contact Button" below. You can also download it from the "PDF Download" below, so feel free to do so.

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• Gear cutting machine/Gear finishing machine

The "R Series" is a standardized series for mounting holes on various flange-type reducers sold by reduction gear manufacturers. Please specify the standard hole for the reducer flange (mounting boss diameter of the R Series). ★ R Series for Nabtesco GH Type Reducers ★ Pinion gears that perfectly fit the flanges of GH7 to 100 series reducers have been standardized. You can choose from SSG ground spur gears, SSCPG ground spur gears, and ZSTP ground helical gears combined with racks. Once the model number of the reducer is determined, proceed to selection with KHK's R Series! Manufacturer completion is possible within 2 working days after order receipt. 【Features】 ■ Matches the mounting holes of compatible reducer series ■ Set bolts are included for immediate use ■ High rigidity due to flange mounting, preventing gear deflection ■ Suitable products as mating pinions for racks * For more details, please refer to the PDF materials or feel free to contact us.

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We manufacture and sell KHK standard gears and various custom gears. Our company also offers "semi-custom standard products" that accommodate large tooth counts not listed in the catalog. Newly added to our lineup are the SSG gear ground spur gears and SS spur gears. Semi-custom standard products are made to order and are not stock items. Prices and delivery times will be provided separately. 【Features】 ■ No design hassle ■ Short delivery times ■ Reliable quality *For more details, please refer to the PDF document or feel free to contact us.

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The "J Series" consists of 50 items and 12,400 types of products based on standard gear underhole products, with hole diameters, key grooves, and mounting hole dimensions standardized according to KHK's unique specifications. We pursue production efficiency and quality, providing highly reliable products through additional processing performed by manufacturers. We quickly respond from our standard gear product inventory to JIT production lines, completing orders within 2 to 7 working days from the day after the order is received. We deliver in a short lead time. 【Lineup】 ■ SSG Gear Ground Spur Gears ■ SSAG Gear Ground Spur Gears ■ SS Spur Gears ■ SSA Spur Gears ■ SUS・SUSA Stainless Steel Spur Gears, etc. *For more details about the products, please refer to the PDF materials. Feel free to contact us with any inquiries.

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The "Rack & Pinion Lubrication System" is a suitable lubrication system for rack and pinion used in open environments. A small amount of grease is automatically supplied through the lubricating gears. It can be integrated with the control system of the machinery in use, allowing for adjustment of the lubricant amount according to the application. The polyurethane lubricating gears apply grease, forming a uniform lubrication film. 【Features】 ■ Can be integrated with the control system of the machinery in use ■ Allows adjustment of the lubricant amount according to the application ■ Applies grease using polyurethane lubricating gears ■ Forms a uniform lubrication film ■ Reduces maintenance costs *For more details, please refer to the PDF document or feel free to contact us.

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The "SRF-HL" is a low-distortion hardening rack that applies laser technology to tooth surface hardening. By standardizing tooth surface laser hardening and controlling costs and distortion, it increases tooth surface strength by more than twice compared to conventional SRF racks. 【Features】 ■ Standardized hardening H series ■ Lineup of total lengths 1000, 1500, and 2000 mm ■ 21 types of modular types standardized (m1.5~6) ■ 12 types of CP types standardized (CP5~20) ■ D type with mounting holes is also available. *For more details, please refer to the PDF document or feel free to contact us.

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The "SSAG Flat Gear" is a gear commonly used in reduction gears. Since it is a standard gear, there is no hassle of estimates or drawing production. Furthermore, without the need for bossless processing, both delivery time and costs can be reduced. 【Features】 ■ No need for bossless processing ■ Matches the mounting holes of compatible reduction gear series ■ Set bolts are included for immediate use ■ High rigidity due to flange mounting, preventing gear deflection ■ Suitable product as a counterpart pinion for racks ■ No need for estimates or drawing production since it is a standard gear ■ 66 types of gears are standardized *For more details, please refer to the catalog or feel free to contact us.

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• Power Transmission Equipment

The "F Series" is a friction-locked gear that uses bushings to secure the shaft and gear. Based on standard gear products with pilot holes, we have developed a series of bushing-integrated gears in KHK's unique specifications, offering a lineup of 3 items and 2,100 variations. With new machinery and a JIT production line, we pursue production efficiency and quality. We solve issues such as "the play between the gear and shaft during fastening is troublesome!" and "the runout after additional processing is a problem!" through reliable additional processing performed by the manufacturer. 【Features】 ■ Manufacturer completion in 2 working days ■ No play between the shaft and gear during fastening ■ Can be installed in any position and easy to align ■ Easy to install and remove, reusable multiple times ■ In case of overload, the bushing slips to reduce damage to the gear *For more details, please refer to the catalog. Feel free to contact us with any inquiries.

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• Power Transmission Equipment

The "SSA flat gear" is a flat-shaped gear that has been lightened by cutting the boss. In addition to the J series with a finished shaft hole, we also offer the F series, which uses a bushing to fasten the shaft and gear through friction, and the hardened plus, which has high-frequency hardening added to the tooth surface. 【Features】 ■ Black oxide surface finish ■ Additional processing available ■ Machined finish *For more details, please refer to the catalog. Feel free to contact us with any inquiries.

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The "SS Spur Gear" is a versatile spur gear available in a wide range of modules and tooth counts at a low price. We also offer the F series of friction-joined gears that use bushes to secure the shaft and gear. The surface is treated with black dye, and additional processing is possible. With a rich lineup of sizes, we can promptly respond to your needs. 【Features】 ■ m0.5 to m10, a wide range of modules; semi-custom options are also popular. ■ Additional processing available ■ Machined finish *For more details, please refer to the catalog. Feel free to contact us with any inquiries.

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KHK's "Standardized Hardening H Series" features high-frequency hardening on the tooth surface. With increased strength, it achieves an astonishing weight reduction and compactness of 26.8 kg. For immediate delivery due to standardized hardening, please inquire about custom hardening as well. We also have a variety of mating pinions available; please choose from KHK's standard gears. 【Features】 ○ Cost performance ○ Reliable Made in Japan For more details, please contact us or download the catalog.

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• rack

SRG/SRGF/SRGFD/SRGFK [CP] The gear rack is a product of accuracy grade: KHK R 001 Class 3. - Module 0.5 to 6 - Circular pitch 5 to 20 - Available lengths: 100, 300, 500, 1000 - D-type with mounting holes also available The tooth profile is straight, the pressure angle is 20°, and the material is S45C-D. Additional machining is possible outside of the tooth area. 【Features】 ○ Heat treatment: High-frequency hardening of the tooth surface ○ Tooth surface hardness: 50 to 55 HRC ○ Surface treatment: Blackening except for the tooth area ○ Tooth surface finishing: Grinding ○ Gear rack reference surface: Bottom surface For more details, please contact us or download the catalog.

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The CBX bevel box standardizes products with 24 different shaft configurations based on the direction and rotation of the shaft. By selecting the shaft configuration, any installation is possible (although it may not be usable in its standard form). The case is made of high-quality cast iron, the bearing section uses tapered roller bearings, and spiral bevel gears are made from carburized and hardened special steel. 【Features】 ○ Robust ○ Low noise and high efficiency ○ Free installation direction ○ Lubricant pre-filled (shipped with high-quality oil) ○ Speed ratio (gear ratios of 1/1 and 1/2 can be selected according to application) For more details, please contact us or download the catalog.

• Other machine elements

The ring rail gear is a product with a low-friction structure. It features a lubricator specification for efficient lubrication. There is minimal play between the ring rail and the bearings. The large open central section can accommodate other components. For more details, please contact us or download the catalog.

• Other machine elements

The SMSG spiral miter module 1 is a product that requires a high level of precision and technical skill. We confidently offer the industry's first standard gear, the ground spiral miter. 【Features】 - Standardization of fine pitch ground spiral miter - Gleason tooth profile - Excellent strength and wear resistance - Capable of transmitting high torque with a compact design For more details, please contact us or download the catalog.

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KHK's "Gear Workshop" is KHK's original order system that customizes KHK standard gears according to customer requests and delivers them as finished products. The Gear Workshop accepts orders from one piece to mass production. Heat treatment and surface processing are also available. Please feel free to contact us. We always have "standard gears" in stock, and they are immediately transported to the JIT line for additional processing after receiving an order. 【Features】 ○ Guaranteed delivery on the promised date ○ Delivered as finished products ○ Providing peace of mind with ready-to-use products ○ A "Gear Workshop" label certifying "Trusted Additional Processing" is affixed at the time of shipment → Delivering quality along with the label For more details, please download the catalog.

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The method for selecting gears varies depending on which factors are prioritized in the design, such as strength, size, precision, and reduction ratio. Here, we will introduce "selection based on strength" and "selection based on intended use" as guidelines. 【Selection Based on Strength】 ○ Determine the actual load torque on the gear and the appropriate type of gear for the intended purpose. ○ Make a preliminary selection based on the load torque from the allowable torque tables in the comprehensive catalog or web catalog. ○ Conduct strength calculations under actual usage conditions to evaluate the appropriateness of gear strength. 【Selection Based on Intended Use】 ○ High-speed rotation ○ High strength (compact) ○ Backlash ○ Indexing and positioning ○ Cost performance ○ Machinability ○ Large reduction ratio ○ Rust prevention measures

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F～Fine Pitch～ is a product line uniquely developed by KHK, featuring popular sizes of m0.5 and 0.8. The KHK Group is committed to producing reliable products. Small gears do big work. 【Features】 ○ 300 new items added ○ A new lineup of 570 types, focusing on small modules For more details, please contact us or download the catalog.

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The KRGF-H/KRGFD-H/KRGCPF-H/KRGCPFD-H tooth grinding rack standardizes high-frequency hardening of the tooth surface for heat-treated materials. By standardizing, we can offer it at a lower price. This product has a 50% increase in tooth surface strength compared to the conventional KRGF and KRGCPF heat-treated tooth grinding racks. - Module 1.5 to 3 - Circular pitch 5, 10 - Available lengths of 500 and 1000 - D-type with mounting holes also available 【Features】 ○ Accuracy grade: KHK R 001 Class 1 ○ 50% increase in tooth surface strength compared to conventional KRGF and KRGCPF heat-treated tooth grinding racks ○ Series For more details, please contact us or download the catalog.

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KHK standard gears, SSG gear ground spur gears, are products that can undergo additional processing with hardened tooth surfaces. To allow users to freely select the optimal gears according to their applications, we offer a wide variety of materials, shapes, modules, and number of teeth. Additionally, we provide products that can be freely modified to match design specifications, such as hole diameter, keyway, and tapping, enabling a broader range of designs. 【Features】 ○ These products have hardened tooth surfaces but can still undergo additional processing. ○ We have prepared finished products in the J series. *For more details, please contact us or refer to the catalog.

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【Features】 ○ This is a stainless steel spur gear made of SUS303, which is resistant to rust. ○ We have prepared the completed J series. To allow users to freely select the optimal gear according to their applications, we offer a wide variety of materials, shapes, modules, and number of teeth. Additionally, we provide products that can be freely modified to match design specifications, such as hole diameter, keyways, and taps, enabling a broader range of designs. *For more details, please contact us or refer to the catalog.

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PS・PSA plastic gears are made of MC nylon, which can be used without lubrication, making them ideal for food machinery. We offer a wide variety of materials, shapes, modules, and number of teeth so that users can freely select the optimal gear for their applications. Additionally, we provide products that can be freely customized with hole diameters, keyways, taps, etc., according to design specifications, allowing for a broader range of designs. 【Features】 ○ Made of MC nylon, suitable for use without lubrication, ideal for food machinery. ○ We also offer the completed J series. *For more details, please contact us or refer to the catalog.

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The SUKB stainless steel boss is an assembled boss made from rust-resistant stainless steel. It is a perfect match for PSA plastic spur gears and is ideal for food machinery and similar applications. This product is economically excellent, effectively utilizing expensive materials. 【Features】 - Made from rust-resistant stainless steel as an assembled boss. - Increased strength in the keyway section. - Best match for PSA plastic spur gears, ideal for food machinery and similar applications. - Economically excellent product that effectively uses expensive materials. *For more details, please contact us or refer to the catalog.

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KHG gears are products designed with considerations for quiet operation, compact design, and cost-effectiveness, suitable for high-speed rotation in various industrial machines such as machine tools and reducers. They excel in strength and wear resistance, allowing for a more compact design. When selecting gears, please check the specifications and dimensions of each product according to your intended application. 【Features】 - Usable with the assembly distance of spur gears. * - Products designed with considerations for quiet operation, compact design, and cost-effectiveness. - Suitable for high-speed rotation in all types of industrial machinery, including machine tools and reducers. - Excellent in strength and wear resistance. - Allows for a compact design. * Usable with the assembly distance of spur gears. KHG gears adopt a "right angle" module. The assembly distance is the same as that of spur gear sets with the same module and number of teeth. This results in increased strength and improved quietness, receiving positive feedback for power enhancement from spur gears. For more details, please contact us or refer to the catalog.

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【Features】 - A wide range of modules from 0.5 to 10, with various lengths available at low prices, offering versatility. Circular pitch options from 2.5 to 20 are also included. → Responds promptly to user needs. - D-type with mounting holes is also available. - J series is also available. *For more details, please contact us or refer to the catalog.

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- Modules 1 to 4 - Circular pitch 5, 10 - Total length 500 mm, 1000 mm - D type with mounting holes is also available. 【Features】 ○ Made of SUS304, making it ideal for food machinery and other applications where rust is undesirable. *For more details, please contact us or refer to the catalog.*

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- Modules 1 to 3 - Total lengths of 100mm, 500mm, and 1000mm - J series (with mounting holes) also available 【Features】 ○ High precision, high strength, quiet operation, and excellent wear resistance in a high-quality product *For more details, please contact us or refer to the catalog.

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【Features】 ○ Circular pitch: 5, 10 ○ Total length: 1000 mm ○ J series (with mounting holes) D type is also available. ○ The counterpart pinion can be adjusted for backlash amount when set with KTSCP. ○ Products designed for positioning in linear motion. *For more details, please contact us or refer to the catalog.

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【Features】 ○ Stainless steel rack with the same shape as SRO ○ Suitable for use with machines that dislike rust ○ A product capable of high-precision linear motion For more details, please contact us or refer to the catalog.

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A bevel gear with a tooth ratio of 1:1 and an axis angle of 90° is commonly referred to as a "miter." 【Features】 ○ Gleason tooth profile ○ Excellent strength and wear resistance ○ Capable of transmitting high torque with a compact design *For more details, please contact us or refer to the catalog.

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A bevel gear with a tooth count ratio of 1:1 and an axis angle of 90° is commonly referred to as a "miter." 【Features】 ○ A finished product that can be used without additional processing ○ Three types of hole diameters are available ○ Gleason tooth profile ○ Excellent strength and wear resistance *For more details, please contact us or refer to the catalog.

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To adjust the backlash of a worm gear, it is common to change the assembly distance, which previously required extensive modifications such as working on the gear case to alter the already assembled distance. However, by using a multi-lead worm gear, it becomes possible to adjust the backlash without changing the assembly distance of the gear case, greatly improving workability and maintenance convenience. 【Features】 ○ Module 1.5 to 4 ○ High-strength, high-precision multi-lead worm Moving the worm axially allows for any desired backlash ○ Multi-lead worm wheel with first-class pitch accuracy and excellent wear resistance The wheel is made of aluminum bronze, which has excellent anti-friction properties *For more details, please contact us or refer to the catalog.

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A compact mechanism that easily achieves a large reduction ratio (high torque) is best accomplished with a worm gear. 【Features】 ○ A worm made of stainless steel that is resistant to rust. ○ Optimal for use with DG and PG wheels. ○ The completed J series is also available. *For more details, please contact us or refer to the catalog.

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A rack with the same tooth width and height in European size. It is a compact and low-cost product. 【Features】 ○ Module 1.5–4 ○ Total length 1000 mm ○ Rack with square-shaped end surface processing ○ Compact size with the same tooth width and height ○ Offered at a low price ○ J series (with mounting holes) is also available. *For more details, please contact us or download the catalog.

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Prepare modules 1.5 to 5, with total lengths of 500 and 1000 mm. Prepare circular pitches of 5 and 10, with total lengths of 500 and 1000 mm. KHK standard racks have an R-shaped finish on the tooth tips for safety and to prevent scratches and dents. This R-shaped profile is patented by KHK and is applied to all products except for BSR and PR racks due to its noise-reducing effect. The "KRF hardened rack" is made from SCM440 material that has been hardened to enhance gear strength. The J series (with mounting holes) is also available. 【Features】 ○ Module 1.5 to 5 ○ Circular pitch 5 and 10 ○ Hardened SCM440 material to enhance gear strength ○ J series also available *For more details, please contact us or refer to the catalog.

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"KHK Genuine GJS Gear Lubrication Spray" is a spray-type lubricant that incorporates molybdenum in its extreme pressure additives. We have prepared three types of sprays according to their applications. 【Product Lineup】 《GJS-0801 Base Spray》 This product contains a high concentration of molybdenum disulfide in its extreme pressure additives, making it an optimal lubricant for high-load gears. 《GJS-0901 Dry Coat Spray》 This is a dry-type lubricant, but it contains a high concentration of molybdenum disulfide, just like the paste spray, providing excellent lubrication effects. It can also be used in a vacuum. 《GJS-1001 Super Spray Grease》 This is a light yellow grease that incorporates organic molybdenum in its extreme pressure additives. It can be used universally for gear grease lubrication. *For more details, please contact us or refer to the catalog.

• gear
• Lubricants

This is a hardened tooth ground helical rack manufactured by Schöneberger. The dimensions of the rack are in European specifications, adopting a special twist angle of 19°31′41″, resulting in a movement of 200, 250, 300, 400 mm... in whole millimeters for one rotation of the pinion. Additionally, the pinion gear is designed as a plus displacement gear to enhance strength, while also ensuring that the assembly distance is in whole millimeters, prioritizing user-friendliness for our customers. Due to high-frequency hardening of the tooth surface, additional machining such as mounting holes can be freely added outside of the tooth area. The J series (with mounting holes) is also available. *For more details, please contact us or refer to the catalog.

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The "ZST-GL Assembly-Only Gauge" is an assembly-only gauge for the hardened tooth ground helical rack manufactured by Schneeberger. The material is S45C, and the accuracy is KHK R 001 Class 2. 【Features】 ○ Module 1.5 to 6 (CP5 to 20) ○ Assembly-only gauge for the hardened tooth ground helical rack manufactured by Schneeberger *For more details, please contact us or refer to the catalog.

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The carburized tooth grinding rack "MRGF/MRGFD" is a high-strength and high-precision tooth grinding rack that has undergone carburizing hardening only on the tooth parts and has been ground on the tooth surfaces. All four long sides of the rack are ground, and the maximum deflection is finished to 0.05 mm over a total length of 500 mm. - Module 1.5 to 3 - Circular pitch 5, 10 - D-type with mounting holes also available 【Features】 ○ High-strength and high-precision tooth grinding rack ○ Since only the tooth parts are carburized, the mounting holes can be freely processed ○ J series also available *For more details, please contact us.

• Other machine elements