Bolt Product List and Ranking from 23 Manufacturers, Suppliers and Companies

Last Updated： Aggregation Period:Jan 14, 2026～Feb 10, 2026
This ranking is based on the number of page views on our site.

Bolt Manufacturer, Suppliers and Company Rankings

Last Updated： Aggregation Period:Jan 14, 2026～Feb 10, 2026
This ranking is based on the number of page views on our site.

  1. トーネジ（ 旧 東京ネジ製作所） 東京本社 Tokyo//Building materials, supplies and fixtures manufacturers
  2. 大津鉄工 Aichi//Other construction industries
  3. ノルトロックジャパン Osaka//Building materials, supplies and fixtures manufacturers
  4. 4 岡井鉄工所 Osaka//Building materials, supplies and fixtures manufacturers
  5. 5 池田金属工業 Osaka//Building materials, supplies and fixtures manufacturers
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Bolt Product ranking

Last Updated： Aggregation Period:Jan 14, 2026～Feb 10, 2026
This ranking is based on the number of page views on our site.

  1. Temporary assembly bolt for steel structures "Hug Bolt" トーネジ（ 旧 東京ネジ製作所） 東京本社
  2. High Tension Bolt "Torshia Type Ultra High Strength Bolt (SHTB)" 大津鉄工
  3. Hexagon socket bolt 岡井鉄工所
  4. 4 [Nortlock Product Adoption Case] Tokai Railway Company (JR Tokai) ノルトロックジャパン
  5. 4 Measures against bolt loosening at construction sites! Nord-Lock washers. ノルトロックジャパン

Bolt Product List

1～30 item / All 47 items

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Hexagon socket bolt

Hexagon socket bolt

Difficult to loosen and highly workable. A confident creation from the stainless steel specialist manufacturer Okitsu Spiral.

Hexagon socket bolts made by a stainless steel specialized manufacturer 【Features】 ○ Achieves compact fastening devices and equipment, enabling application in narrow spaces and improving workability ○ Available sizes: M3 to M8 ○ High tightening force prevents loosening ● Please try the hexagon socket bolts made by a stainless steel specialized manufacturer. ● In addition to standalone cap bolts, we also manufacture button bolts, flat bolts, and bolts with washers. For details, please contact us.

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  • Bolt

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YFS(R) Hexagon Socket Bolt

YFS(R) Hexagon Socket Bolt

Guaranteeing high strength of 12.9 even for large diameters of M22 and above! A lineup of over 1200 sizes from M3 to M36.

The "YFS(R) Hexagon Socket Bolt" is a product from one of the largest Taiwanese brands specializing in the manufacturing of high-strength bolts. Thanks to advanced quality control, we can guarantee a strength classification of 12.9 even for larger sizes of M22 and above. We offer a wide range of stock sizes from a minimum of M3 to a maximum of M36, allowing for the procurement of main sizes from a single company. 【Features】 ■ Price competitiveness due to one-stop production with one of the largest production volumes in the world ■ Guarantee of high strength of 12.9 even for diameters of M22 and above ■ A lineup of over 1200 sizes from M3 to M36 *For more details, please refer to the related links or feel free to contact us.

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[Case Study] Reduction of Maintenance Frequency and Improvement of Quality through Anti-Loosening Measures

[Case Study] Reduction of Maintenance Frequency and Improvement of Quality through Anti-Loosening Measures

A case where Nord-Lock washers contributed to a reduction in maintenance frequency.

Here is a case where we proposed "Nord-Lock washers" to an industrial machinery manufacturer. They were using hex socket bolts (CAP) in their binding equipment, but there was an issue with loosening occurring after delivery. After our proposal, the reports of loosening troubles, which had been occurring almost every month, dropped to zero. [Overview of the Issue] ■ Hex socket bolts (CAP) are used in the binding equipment, but loosening occurs after delivery. ■ There were 2 to 3 reports per month, and maintenance was performed at the customer site each time. *For more details, please refer to the related links or feel free to contact us.

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Hexagon socket bolt (cap)

Hexagon socket bolt (cap)

Improved reliability and workability due to prevention of loosening with high tightening force.

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 neck length of 1,000 mm). *In urgent or emergency cases, please direct any technical inquiries through our website.

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  • Bolt

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Hexagon socket bolts (caps) for large machinery, civil engineering, and shipbuilding-related products.

Hexagon socket bolts (caps) for large machinery, civil engineering, and shipbuilding-related products.

The compactness of the device has improved, and the design performance of the equipment has enhanced.

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 neck length of 1,000 mm). This contributes to the compactness of the equipment, improves the design performance of the devices, allows for application in narrow spaces, and enhances workability. With high tightening force, it improves reliability by preventing loosening. *For urgent or emergency inquiries, or technical questions, please contact us directly through our website.

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【Product Catalog】Hexagon Socket Bolt JIS B 1176

【Product Catalog】Hexagon Socket Bolt JIS B 1176

Prevents loosening with high clamping force! Bolts used in large machinery, civil engineering, and shipbuilding.

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 1,000mm). Our company has established a system to accommodate all orders by leveraging the characteristics of hot and cold forging technology. 【Features】 ○ Compact design of equipment ○ Improved design performance of devices ○ Application in narrow spaces and enhanced workability ○ Increased reliability by preventing loosening with high tightening force *For urgent or emergency inquiries, please contact us through our website for technical questions.

  • Joints between components
  • Work tools
  • Bolt

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14.9 Socket Head Cap Screw

14.9 Socket Head Cap Screw

We have developed 14.9 Ultra-high strength Socket head cap screw

Characteristics 1. Improvement for the risk of delayed fracture 2. Improvement of fatigue resistance for extension in service life 3. Realization of compact design by size down 4. Improvement of tightening force for loosening prevention

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  • Bolt

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Hexagon socket bolt "Manufactured in JIS certified factory"

Hexagon socket bolt "Manufactured in JIS certified factory"

Achieving high quality based on Japanese standards while maintaining low prices comparable to overseas products! Realizing a high level of QCD!

JINN HER Co., Ltd. (Taiwan) has been a specialized manufacturer of steel bolts with a solid reputation and track record in various sectors of the industry since its establishment in 1980. Our factory, certified by JIS, maintains high quality standards. We possess various measuring instruments such as fatigue testers, torque testing machines, and image sorting machines, allowing us to provide products that meet our customers' high quality requirements. We can also submit various inspection certificates, including product inspection reports, mill sheets, and heat treatment certificates, enabling us to respond flexibly to diverse requests. Takashima Co., Ltd. serves as the exclusive distributor in Japan for the company's "JIS certified" hexagon socket bolts, offering a rich inventory and a wide range of products. Additionally, we promise to provide comprehensive services to meet customer requests, including inquiries about products and submission of materials. Please feel free to contact us for details regarding materials, delivery times, prices, and more.

  • Secondary steel products
  • Bolt

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Insulating bolt

Insulating bolt

This is an insulated bolt designed to prevent galvanic corrosion caused by potential differences between dissimilar metals.

The bolts are lined with a strong resin that provides high strength and insulation, making them not only excellent in insulation but also highly resistant to corrosion and weathering. Additionally, this lining is finished to the same diameter as the screw, allowing for easy installation.

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Hexagonal hole machining, Sanki Manufacturing Co., Ltd.

Hexagonal hole machining, Sanki Manufacturing Co., Ltd.

Rotate the material to perform hexagonal hole processing.

We can assist with small milling parts that are difficult to chuck. By processing both sides simultaneously, we can achieve precise alignment of the front and back.

  • Steel construction
  • Bolt

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Metal processing: Hexagonal hole machining with lathe and press machine.

Metal processing: Hexagonal hole machining with lathe and press machine.

Millimeter and inch sizes available! Introducing hexagonal hole processing done with lathes and presses.

Our company performs hexagonal hole processing using lathes and presses. We can accommodate hexagonal holes with a distance between opposite sides of 0.7mm in both metric and inch sizes. Even for long materials, as long as the material is Φ34 or less, we can process hexagonal holes, and we also handle hexagonal hole processing for fine screws and special screwdrivers. 【Features】 ■ Hexagonal hole processing with lathes and presses ■ Available in metric and inch sizes ■ Can accommodate long materials as long as the material is Φ34 or less ■ Also supports fine screws and special screwdrivers *For more details, please refer to the PDF document or feel free to contact us.

  • Support hardware/opening hardware
  • Bolt

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Special screw, special low-head bolt

Special screw, special low-head bolt

Effective when you want to suppress the protrusion of the screw head! It fits neatly in a space-saving manner.

At Sun-Ei Co., Ltd., we offer custom-made screws tailored to specific products and specifications for applications such as construction, machine tools, transportation machinery, industrial machinery, and chemical plants. If you have any special screws that are not available on the market, please feel free to consult us. "Special Low-Head Bolts" are effective when you want to minimize the protrusion of the screw head. They fit neatly in a compact space. We can accommodate sizes M8 and above. For more details, please contact us or refer to our catalog.

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Hexagon socket bolt

Hexagon socket bolt

Numerous adoption cases! For machine tools, press molds, construction machinery, industrial machinery, semiconductor equipment, and more.

We would like to introduce the "Hexagon Socket Bolt" that we handle. We have a proven track record of adoption in a wide range of production sizes for machine tools, press molds, construction machinery, industrial machinery, semiconductor equipment, robots, and more. 【Features】 ■ Wide range of production sizes ■ Integrated production from materials to heat treatment ■ Various certification issuance available ■ Stable quality 【Product Lineup】 ■ 12.9 Hexagon Socket Bolt ■ Nickel 10.9 Hexagon Socket Bolt ■ Trivalent Chromate (White) 10.9 Hexagon Socket Bolt ■ Trivalent Chromate (Black) 10.9 Hexagon Socket Bolt ■ 12.9 Hexagon Socket Flat Bolt ■ 12.9 Hexagon Socket Button Bolt ■ 10.9 Hexagon Bolt

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Temporary assembly bolt for steel frame construction "Hug Bolt"

Temporary assembly bolt for steel frame construction "Hug Bolt"

Considerate of the Earth and reducing costs! Temporary assembly bolts for steel structures born from new ideas.

The "Hug Bolt" has larger thread pitch, thread angle, and lead at the tip compared to standard products. As a result, the rotation from the initial engagement of the bolt and nut is smooth, contributing to improved workability. Its structure makes it resistant to dents on the threaded part, making it an eco-friendly bolt suitable for reuse. 【Features】 ■ Reduces disposal costs and contributes to an eco-friendly society ■ Speeds up work with a large thread pitch ■ Thread structure that is resistant to dents ■ Size displayed on the bolt head for improved usability ■ Sturdy design that meets axial shear force requirements ■ Unique reuse plan in place *For more details, please refer to the PDF document or feel free to contact us.

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Electrical insulation bolt

Electrical insulation bolt

Custom-made insulating bolts and nuts.

The bolts and nuts are manufactured and sold not only based on the distinction between iron and stainless steel but also according to specifications regarding material, strength, and plating. Since they are made to order, there is flexibility in the shape of the bolt body and insulating parts. The bolts and nuts can comply with not only JIS standards but also ASTM and ANSI/ASME, and various test certificates can be issued.

  • Piping materials (copper pipes, cast iron pipes)
  • Bridge Materials
  • Bolt

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Temporary assembly bolt for steel structures "Hug Bolt"

Temporary assembly bolt for steel structures "Hug Bolt"

Improved work speed with a large screw pitch! This is a temporary fastening bolt that is resistant to dents and suitable for reuse.

"Hug Bolt" is a temporary assembly bolt for steel structures that excels in workability and contributes to environmental and cost reduction. This product improves workability by significantly increasing the pitch of the threads, the angle of the thread peaks, and the lead of the thread tip compared to conventional products, allowing for smooth rotation from the initial engagement of the bolt and nut. Additionally, its design minimizes the likelihood of dents on the threaded section, making it suitable for reuse. This reduces disposal costs and contributes to an eco-friendly society. Furthermore, as part of the recent efforts in construction sites to challenge zero emissions, we have devised a reuse plan for Hug Bolt. This initiative aims to shorten the time resources remain on construction sites, reduce environmental impact, and enhance environmental conservation awareness. 【Features】 ■ Doubles the thread pitch of standard products to speed up work ■ Changes the thread angle to 90 degrees and modifies the tip to a rounded shape for suitability in reuse ■ Displays size on the bolt head to improve usability ■ Features a thick shaft structure that meets axial shear force requirements ■ Reduces disposal costs and contributes to an eco-friendly society through the application of the reuse plan *For more details, please refer to the catalog or feel free to contact us.

  • Interior and exterior construction accessories
  • Temporary Construction Materials
  • Steel construction
  • Bolt

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Hexagon socket bolt

Hexagon socket bolt

The component grade is A as specified by JIS B1021! Hexagon socket bolts with thorough quality control.

The "Hexagon Socket Bolt" is a product of Okai Iron Works Co., Ltd., which manufactures and sells various fasteners and precision parts. Our company anticipates needs and proposes optimal products. 【Features】 ■ A thorough inspection system that meets JIS standards ■ Comprehensive quality control and rational product management ■ Dedicated automatic warehouses for molds and products ■ Quick response to sudden orders with "immediate production and shipping" ■ High productivity through the introduction of advanced equipment *For more details, please refer to the catalog or feel free to contact us.

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Hexagon socket bolt with washer assembly

Hexagon socket bolt with washer assembly

A wide range of products in the lineup! Hexagon socket bolts with built-in washers.

The "Washer-Integrated Hexagon Socket Bolt" is a product of Okai Iron Works Co., Ltd., which manufactures and sells various fasteners and precision parts. We offer a wide range of products, including the "V type," which incorporates a wave washer to enhance spring action, and the "S type," which is expected to provide strong tightening and anti-loosening effects. 【Features】 ■ A thorough inspection system that meets JIS standards ■ Rigorous quality control and rational product management ■ Dedicated automatic warehouses for molds and products ■ Quick response to sudden orders with "immediate production and shipping" ■ High productivity achieved through the introduction of advanced equipment *For more details, please refer to the catalog or feel free to contact us.

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Nortlock Washer with Railway Vehicle Adoption Examples [NETIS Registered]

Nortlock Washer with Railway Vehicle Adoption Examples [NETIS Registered]

Numerous achievements in all industries! Wedge lock products that physically prevent bolt loosening.

The "Nortlock Washer" employs a "wedge lock mechanism" and is a loosening prevention product that does not rely on friction. It protects bolt connections from loosening even in the most severe vibration environments, ensuring solid safety. It is used in various bolt connections in the railway industry worldwide, including bogies, couplers, brake systems, equipment, track maintenance, and sleepers. Its high quality and safety have been recognized, and it has been registered in the database "NETIS" (New Technology Information Sharing System) operated by the Ministry of Land, Infrastructure, Transport and Tourism. (Registration number: KKK-190002-A) 【Features】 ■ Loosening prevention that does not rely on friction ■ Wedge lock mechanism ■ Many approvals and certifications, primarily in Europe ■ Sizes (Steel): M3 to M130 ■ Sizes (SUS): M3 to 80 *For more details, please refer to the PDF document or feel free to contact us.

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[Nortlock Product Adoption Case] Tokai Railway Company (JR Tokai)

[Nortlock Product Adoption Case] Tokai Railway Company (JR Tokai)

No more lock nuts that have been used hundreds and thousands of times! An example that also contributed to vehicle weight reduction.

We would like to introduce a case study of Tokai Railway Company (JR Tokai), which has adopted Nord-Lock products. The company has relied on skilled workers who meticulously maintain and inspect their systems day and night to ensure safety, which required a tremendous amount of effort and time. To address this, they adopted our "Nord-Lock Washer." This product has a mechanism that prevents loosening and rotation, even in extremely harsh vibration environments, significantly advancing this long-standing challenge. 【Case Overview】 ■ Customer: Tokai Railway Company (JR Tokai) ■ Product: Shinkansen N700 Series Vehicles ■ Adopted Product: Nord-Lock Washer *For more details, please refer to the PDF document or feel free to contact us.

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[Complimentary Guidebook Available] Thorough explanation of various bolt loosening prevention methods!

[Complimentary Guidebook Available] Thorough explanation of various bolt loosening prevention methods!

This booklet explains the causes of bolt loosening and serves as a guide to understanding proper fastening methods.

The publication includes challenges of bolt fastening, factors causing axial force loss, methods to prevent loosening of bolt fastenings, and guidance for selecting loosening prevention methods. It compares and evaluates general methods for preventing loosening of bolt fastenings over the service life of assemblies, allowing you to choose appropriate fastening methods to solve issues related to bolt fastening. 【Contents (excerpt)】 ■ Why do bolts loosen? ■ Challenges of bolt fastening ■ Factors causing axial force loss ■ Guidance for selecting loosening prevention methods ■ Loosening prevention methods for bolts by product ■ Corrosion countermeasures for metals >>>NEWS<<< Nord-Lock Japan will exhibit at the "Plant Maintenance Show" held from July 24 to 26. If you plan to attend or are interested, please stop by our booth (M4-176).

  • Road signs and road accessories
  • Bolt

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Rust prevention treatment Shinko high-tension bolt

Rust prevention treatment Shinko high-tension bolt

Rust-resistant treatment Shinko high-tension bolts that show no abnormalities even after 100 hours of salt spray testing.

The "Anti-Corrosion Treatment Shinko High-Tension Bolt" has a surface treatment that excels in corrosion resistance and compatibility with topcoats. Corrosion resistance has been tested in two ways: a salt spray test for 100 hours and a weather resistance test for 1000 hours, with no abnormalities observed. 【Features】 ■ Excellent compatibility with topcoats and corrosion resistance ■ Joint characteristics (slip resistance, stress relaxation, loosening, etc.) are comparable to standard high-strength bolts ■ No contamination from anti-rust oil, and no adhesion of dust or other particles ■ Bolt performance equivalent to standard high-strength bolts ■ The threads of the nuts are over-tapped before anti-corrosion treatment, but the amount does not affect strength *For more details, please download the PDF or contact us.

  • Safety and consumables
  • Bolt

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Shin-Ko High Tension Bolt

Shin-Ko High Tension Bolt

Special surface treatment that is less affected by temperature changes is applied to the nut!

The "Kobe Steel High Tension Bolt" allows for stable tightening axial force and flawless construction. Since it is manufactured under a consistent quality control system, the quality is uniform. This results in a stable torque coefficient value, allowing for a consistent axial force. Please feel free to contact us if you have any requests. 【Features】 ■ Stable tightening axial force ■ Stability of torque coefficient value ■ Minimal simultaneous rotation of bolts and washers *For more details, please download the PDF or contact us.

  • Safety and consumables
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Information magazine about screws [Yamarin Newspaper] Issue 140

Information magazine about screws [Yamarin Newspaper] Issue 140

Introducing items such as "14.9 hex socket bolts" and "custom specification machined parts"!

This document is issue 140 of the information magazine "Yamarin Newspaper," published by Yamazaki Co., Ltd., which specializes in the sale of screws and general machine tools, the production of special screws, the sale of transmission components, and machining. It features the strength category 14.9 "hexagon socket bolts," which are suitable for those considering lightweight and compact devices, as well as "custom-made processed parts" and "screw trivia." Please take a moment to read it. [Contents] ■ 14.9 Hexagon Socket Bolts ■ Custom-Made Processed Parts 11 ■ Custom-Made Processed Parts 12 ■ Screw Trivia ■ Introduction to IT (Part 18) *For more details, please refer to the PDF document or feel free to contact us.

  • Work tools
  • Woodworking machines, instruments, and tools
  • Work tools
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【PEM】Self-Clinching Stud

【PEM】Self-Clinching Stud

A lineup including the "standard type" and "space-saving thin plate type"!

We would like to introduce our "Self-Clinching Studs." Compared to standard clinching studs, we offer a rich lineup including the "Space-Saving Edge Type," which can be installed 25-50% closer to the edge of the plate, and the "High-Strength Type," which can be used as an alternative to welding studs. Please feel free to contact us when you need assistance. 【Partial Lineup】 ■ Standard Type "FH, FHS, FHA" ■ For Stainless Steel Plate Insertion "FH4, FHP" ■ Space-Saving Edge Type "FHL, FHLS" ■ Space-Saving Thin Plate Type "TFH, TFHS" ■ High-Strength Type "HFH, HFHS, HFHB" *For more details, please refer to the PDF document or feel free to contact us.

  • Joints between components
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Hex Socket Bolt "Ultra Low Head CAP"

Hex Socket Bolt "Ultra Low Head CAP"

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. 【Features】 ■ The head height is even lower compared to the 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.

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[Case Study] Cost Reduction through Changes in Manufacturing Method of Mass-Produced Screws

[Case Study] Cost Reduction through Changes in Manufacturing Method of Mass-Produced Screws

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 unit 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 they had a request to reduce costs due to the high unit price and increasing usage. We proposed a change in the manufacturing method, which was adopted without any issues and met or exceeded the performance of the conventional products, resulting in significant cost reduction. [Case Overview] ■ Issues - Costs had become too 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 production lots that ensure stable lead times *For more details, please refer to the related links or feel free to contact us.

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[Case Study] Coating the Head of a Left-Hand Thread Hex Socket Bolt

[Case Study] Coating the Head of a Left-Hand Thread Hex Socket Bolt

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 hexagon socket bolts with left-hand threads that have disappeared from the market due to the manufacturer's discontinuation to a textile machinery manufacturer. The M3×7 hexagon socket bolt (left-hand thread) used in textile machinery was discontinued, and without finding an alternative product, the production line would come to a halt, affecting sales. We proposed custom machining of the left-hand thread hexagon socket bolts and painting of the heads, allowing for the selection of right-hand and left-hand threads without changing the screw size, and we were able to deliver the product by the desired deadline. [Overview of the Issue] - The M3×7 hexagon socket bolt (left-hand thread) was used in textile machinery, but production by the manufacturer has ended and it has been discontinued. - If no alternative product is found, the production line will stop, impacting sales. *For more details, please refer to the related links or feel free to contact us.

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Hexagon socket bolt, Allen bolt

Hexagon socket bolt, Allen bolt

Anbrako that guarantees strength 12.9 for sizes M20 and above.

UmbraCo bolts are manufactured using advanced heat treatment technology developed through the design and mass production of aerospace screws, achieving the industry's highest strength of 130-140 Kgf·mm² while also guaranteeing a elongation rate of 9%.

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Low Head Hex Socket Bolt "NS-LOW HEAD Power8"

Low Head Hex Socket Bolt "NS-LOW HEAD Power8"

It is also suitable for areas without clearance or where you do not want to use cross holes for design reasons.

The "NS-LOW HEAD Power8" is a high-strength hexagon socket bolt with an extremely low head shape that significantly exceeds the conventional strength grades of 4.8/5.8, achieving a strength grade equivalent to 8.8. It offers substantial weight reduction compared to JIS standard products. It is also suitable for areas where there is no clearance or where a cross hole is not desired for design reasons. 【Features】 ■ Achieves a strength grade equivalent to 8.8 with an extremely low head shape ■ Substantial weight reduction compared to JIS standard products ■ Ideal for areas without clearance or where a cross hole is not desired for design reasons *For more details, please refer to the PDF document or feel free to contact us.

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