特殊発條興業 (トクハツ) List of Products and Services

We have introduced the large precision press machine "ZEN Former" MPS8500DS. We can also accommodate the production of precision parts. Parts that were previously handled by cutting processes, as well as all shearing processes that require precision, can now be manufactured using press processing thanks to the introduction of the "ZEN Former." 【Features of the "ZEN Former"】 ■ Press capacity: 500t ■ Maintains parallelism of the slide with respect to eccentric loads (variable slide) ■ Capable of generating maximum pressing force at all stroke positions ■ Micron-level repeatability at the bottom dead center (inspection results: 1μm) ■ Equipped with a double slide mechanism to accommodate complex shapes ■ One-shot molding that consolidates multiple processes into one *For more details, please download the PDF or feel free to contact us.

• Axle parts

In conventional press processing, such as bar rolling, significant thinning occurs in the drawn parts. At Tokuhatsu, we have reduced thinning by controlling the flow of material during the pressing process. At Tokuhatsu, we can help solve the following concerns: - Securing seating area: We want to maximize the seating area to reduce surface pressure. - High precision is required for the bar rolling diameter. - Costs are increasing due to forging and cutting. *For more details, please refer to our catalog or feel free to contact us.*

• Axle parts

Many companies that manufacture hydraulic components for automobiles, construction machinery, and agricultural machinery may use drilling processes during production. In such settings, common issues are often heard, such as: ■ Long lead times... ■ High costs... ■ Increased man-hours... With Tokuhatsu's pressing and processing technology, these problems can be resolved! By transitioning from drilling to pressing through integrated molding, we have achieved reduced lead times, decreased man-hours, and cost savings! 【Commonly Used Applications】 Air and oil relief holes 【Commonly Used Industries】 Automotive / Construction Machinery / Agricultural Machinery *For more details, please download the materials or feel free to contact us.

• Axle parts
• others

In a typical situation, when pinning is done, pins are crimped onto press-formed parts; however, since crimping is performed based on the press-formed hole, the positional accuracy of the holes and pins is poor, leading to risks of tilting and falling out, and it tends to be high-cost. At Tokushu Hatsuryou Kogyo, we have achieved significant cost reduction and improved precision by realizing integrated molding. Additionally, through high-strength drawing processing, we have improved the accuracy of positional and perpendicularity by integrating from coil material. 【VA Proposal Example】 ■ Method: Pin + Pressed Parts → Press Processing ■ Product Name: Bracket ■ Application: Transmission Parts *For more details, please refer to the catalog or feel free to contact us.

• Axle parts

At Tokuhatsu, we utilize a variety of press processing technologies such as blanking, bending, drawing, shaving, and cold forging to produce high-quality products. We have achieved a process conversion using progressive presses without dedicated press machines. While different processing methods typically require specialized presses, our company designs molds to enable all manufacturing with general-purpose press machines. This booklet introduces examples of cost reduction and quality improvement achieved through process conversion leveraging our years of experience and know-how. [Contents (partial)] - Increased thickness processing - High-strength drawing processing - Transforming "forging + cutting" into "press processing" - Processing of irregular wire *For more details, please download the PDF or feel free to contact us.

• Axle parts

At Tokuhatsu, we utilize a variety of press processing techniques such as punching, bending, drawing, shaving, and cold forging to produce high-quality products. Additionally, we assist in reducing costs and man-hours for formed parts and improving yield through VA proposals that leverage our many years of experience and know-how in process conversion! [Included in the case study collection] - Thickening processing - High-strength drawing processing - Converting "forging + cutting" to "press processing" - Irregular wire processing *For more details, please refer to our catalog or feel free to contact us.

• Axle parts

Tokuhatsu improves the significant sagging that occurs in the drawing process with conventional bar processing through press processing! At Tokuhatsu, we utilize a variety of press processing technologies such as punching, bending, drawing, shaving, and cold forging to produce high-quality products. Additionally, we assist in reducing costs and man-hours for formed parts and improving yield through VA proposals that leverage our many years of experience and know-how in process transformation! [Included in the case study collection] - Increased thickness processing - High-strength drawing processing - Transforming "forging + cutting" into "press processing" - Irregular wire processing *For more details, please refer to the catalog or feel free to contact us.

• Axle parts

Clip Nut, Spring Nut, Nut Spring The "Clip Nut" is a thin plate spring handled by Tokushu Hatsujou Kogyo Co., Ltd., which manufactures and sells thin plate springs, washers, and functional springs. It allows for temporary fixation in the previous process and securely fastens the target object. It also possesses excellent vibration resistance and durability. It is used for fixing resin parts and metal parts such as bumpers, front panels, and license plates. 【Features】 ■ Temporary fixation possible in the previous process ■ Excellent vibration resistance ■ Excellent durability *For more details, please refer to the catalog or feel free to contact us.

• Spring
• Axle parts
• Other Auto Parts

Disc springs, disc springs for functional use, precision disc springs, machined disc springs These products are used in components integrated into automotive transmissions and shafts, serving to mitigate the impact during gear changes. It is also possible to design them to maintain a constant preload within the deflection range. 【Features】 ■ In-house mold and product specification design is available ■ Design to maintain a constant preload within the deflection range is also possible *For more details, please refer to the catalog or feel free to contact us.

• Spring
• Axle parts
• Other Auto Parts

"Wavespring" is a functional spring handled by Special Spring Industry Co., Ltd., which manufactures and sells thin plate springs, washers, and functional springs. Compared to disc springs, this product allows for design in narrow spaces and can be designed for various loads depending on its shape. It is used for preloading in automotive clutches and shaft components, as well as for shock absorption in lever operations. 【Features】 ■ Various designs are possible ■ Shock absorption is possible ■ Pressure adjustment is possible *For more details, please refer to the catalog or feel free to contact us.

• Spring
• Axle parts
• Other Auto Parts

Snap rings, retaining rings, C-shaped retaining rings, concentric retaining rings Used in various machines including automobiles, construction machinery, heavy equipment, agricultural machinery, and construction, they serve to prevent the shaft hole from moving in the thrust direction. 【Processing Materials】 Hard steel wire, stainless steel wire (deformed wire) 【Possible Processing Diameters】 Outer diameter: 40–150 mm Thickness: 0.5–10 mm Outer diameter: Φ10–Φ800 mm 【Features】 ■ Deformed cross-section wire processed into ring shape ■ Oval-shaped retaining rings can also be manufactured ■ Wave processing can be done simultaneously with coiling *For more details, please refer to the catalog or feel free to contact us.

• Spring
• Axle parts
• Other Auto Parts

The "coil wave spring" is a functional spring handled by Tokushu Hatsujou Kogyo Co., Ltd., which manufactures and sells flat springs, washers, and functional springs. It allows for complex load designs and designs that provide flexibility while saving space. It can be used similarly to coil springs and disc springs, and is utilized in various machines, such as clutch return springs. 【Features】 ■ Capable of complex load designs ■ Design allows for flexibility while saving space ■ Can be used similarly to coil springs and disc springs *For more details, please refer to the catalog or feel free to contact us.

• Spring
• Axle parts
• Other Auto Parts

Goodbye spring washers, spring washers equivalent to JIS B1251 Type 1 and Type 2, special sizes also available. For screw and bolt manufacturers, spring washers equivalent to JIS B1251 Type 1 and Type 2, with agents available, special sizes (high precision, improved flatness, surface roughness) also available. *For more details, please refer to the catalog or feel free to contact us.

• Spring
• Axle parts
• Other Auto Parts

Clip Nut, Spring Nut, Nut Spring The "Clip Nut" is a thin plate spring handled by Tokushu Hatsujou Kogyo Co., Ltd., which manufactures and sells thin plate springs, washers, and functional springs. It allows for temporary fastening in the previous process and securely fastens the target object. It also has excellent vibration resistance and durability. It is used for fixing resin parts and metal parts such as bumpers, front panels, and license plates. 【Features】 ■ Temporary fastening possible in the previous process ■ Excellent vibration resistance ■ Excellent durability *For more details, please refer to the catalog or feel free to contact us.

• Spring
• Axle parts
• Other Auto Parts

SW No. 2 and No. 3, produced in-house with domestic materials. Spring washers manufactured at the latest smart factory, Mita Plant, which started operations in 2015. Spring washers - SW No. 2 and No. 3, equivalent to JIS B1251. Custom sizes are also available upon request. *For more details, please refer to the catalog or feel free to contact us.*

• Spring
• Axle parts
• Other Auto Parts

SPAK Wave Spring Washer - Super Lock Washer - SLW Boasting one of the world's highest production volumes, it is used to prevent loosening in all types of screw fastenings. Compared to spring washers, it is lightweight and has a strong reactive force, making it less likely to damage the mating surface during tightening and preventing loosening due to cutting edges during return. 【Features】 - High spring reaction force: approximately 12 times that of SW2 (compared to our products) and about 5 times that of SW3 (compared to our products) - Lighter than spring washers: 64% of SW2 (compared to our products) and 52% of SW3 (compared to our products) when compared in M8 size - Uniform spring reaction force (please refer to the catalog diagram) - Less likely to damage the mating surface - Allows for shorter bolts (please refer to the catalog diagram) - One of the world's highest production volumes *For more details, please refer to the catalog or feel free to contact us.

• Spring
• Axle parts
• Other Auto Parts

Special Washers Flat washers, washers for high-strength bolts, and custom sizes are available. High precision [improved flatness and surface roughness] and proposals to prevent rotation can be provided. "Flat washers" are handled by Special Spring Industry Co., Ltd., which manufactures and sells thin plate springs, washers, functional springs, and more. Our products are used as flat washers for high-strength bolts and in automotive suspension systems. They reduce seating pressure and prevent loosening due to sinking. 【Features】 ■ Used for flat washers for high-strength bolts, etc. ■ Reduces seating pressure ■ Prevents loosening due to sinking *For more details, please refer to the catalog or feel free to contact us.

• Spring
• Axle parts
• Other Auto Parts

"Various thin plate springs" are thin plate springs, washers, functional springs, etc., manufactured and sold by Tokushu Hatsujou Kogyo Co., Ltd. They facilitate fastening between resin and resin, as well as resin and metal. They are used in all kinds of machinery, including automobiles, office equipment, and electrical devices. 【Features】 ■ Usable in all types of machinery ■ Easily fastens resin to resin ■ Easily fastens resin to metal ■ A wide variety of shapes available *For more details, please refer to the catalog or feel free to contact us.

• Spring
• Axle parts
• Other Auto Parts

Our company utilizes a variety of press processing technologies, such as punching, bending, drawing, shaving, and cold forging, to produce high-quality products. By leveraging our know-how in high-speed and mass production, we achieve cost reduction. Furthermore, we offer a wide range of products through diverse equipment, including multi-forming and polishing. Generally, different processing methods require specialized presses; however, we design our molds so that everything can be manufactured using general-purpose presses. 【Features】 ■ Multi-row high-speed processing - Flatness of washers: achievable within 30μm - Burr-free processing - Punching without fracture surfaces - Spherical washers ■ Achieving process conversion with progressive presses without using specialized presses *For more details, please refer to our catalog or feel free to contact us.

• Press Dies
• Other processing machines

Our company possesses the technology to manufacture a wide range of springs from wire materials through "wire processing." In particular, coil wave springs can achieve a broad range of spring characteristics through combinations of wave counts, parallel winding, and series winding, allowing for fine adjustments to spring properties. We can also design and manufacture according to your specified requirements. 【Features】 ■ Manufacturing of rings and coil waves on a consistent line with ring machines - C-type concentric retaining rings can be molded to specified sizes, from JIS standard products to custom dimensions - Design and manufacturing can be tailored to your specified requirements ■ Streamlining of wave spring washer manufacturing line - Thorough rationalization through inline manufacturing enhances cost competitiveness - Capable of accommodating special dimensions beyond standard products *For more details, please refer to our catalog or feel free to contact us.

• Other processing machines

Our company possesses heat treatment technology that can flexibly respond to small quantities and a variety of products. By applying heat treatment to steel, it is reborn as springs. Using our quenching and tempering furnaces, austempering furnaces, and tempering furnaces, we create characteristics suited to the application based on the material and specifications of the product. 【Features】 ■ Continuous quenching and tempering furnace - Ideal for flat washers, disc spring washers, etc. ■ Continuous austempering furnace - Offers advantages for springs like thin plate springs that cannot tolerate deformation during heat treatment - Capable of handling small lot sizes ■ Press tempering - Applied to products that require even higher dimensional accuracy than the above heat-treated items ■ Various nitriding treatments - Optimal for sliding components *For more details, please refer to our catalog or feel free to contact us.

• Other processing machines

This is the technical documentation regarding "Saravane" from Tokushu Hatsujo Co., Ltd. *For more details, please refer to the catalog or feel free to contact us.

• Spring

At Special Spring Industry, which has contributed to the development of various industries by supplying a wide range of spring products, including various types of washers, we are proposing VA (Value Analysis) through a method transition to press processing. In the case of existing products, due to significant deformation occurring at the burring section during conventional press processing, we had been using a method of "hot forging + cutting." By controlling the flow of material during the press forming process, we have achieved a reduction in deformation. This allows us to maximize the seating area and successfully lower the surface pressure. 【VA Proposal Example】 ■ Method: Forging + Cutting Parts → Press Processing ■ Product Name: Retainer ■ Application: Washer for ball bush fastening *For more details, please refer to our catalog or feel free to contact us.

• Axle parts