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Washer Assembled Screw Product List and Ranking from 9 Manufacturers, Suppliers and Companies

Last Updated： Aggregation Period:Aug 06, 2025～Sep 02, 2025
This ranking is based on the number of page views on our site.

Washer Assembled Screw Manufacturer, Suppliers and Company Rankings

Last Updated： Aggregation Period:Aug 06, 2025～Sep 02, 2025
This ranking is based on the number of page views on our site.

  1. 松平精工 Osaka//Ferrous/Non-ferrous metals 本社
  2. ヤマシナ Kyoto//Manufacturing and processing contract
  3. 望月螺旋 Shizuoka//Machine elements and parts
  4. 4 八幡ねじ Aichi//Resin/Plastic
  5. 5 コヤウチファスナー Saitama//Manufacturing and processing contract
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Washer Assembled Screw Product ranking

Last Updated： Aggregation Period:Aug 06, 2025～Sep 02, 2025
This ranking is based on the number of page views on our site.

  1. Seat insert screw 松平精工 本社
  2. Seat-mounted screw "Polis" ヤマシナ
  3. Thin plate mounting screw "Cero Gap" 望月螺旋
  4. Seat-mounted screw "WIS" ヤマシナ
  5. 4 Sems screw with washer incorporated ツルガ

Washer Assembled Screw Product List

1～13 item / All 13 items

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Washer-integrated screw for thin plates

Washer-integrated screw for thin plates

A screw with an embedded washer that achieves fastening to a thin plate by shortening the incomplete threaded section to the limit!

The "Washer-integrated screw for thin plates" features a screw with an incomplete thread section shortened to the limit, enabling fastening to plates thinner than standard products. The screw is firmly fastened right below the spring washer. It prevents head lifting and fastening failures, achieving secure fastening to thin plates. It accommodates various head shapes, and by changing the washer, it can also fasten even thinner plates. 【Features】 ■ Incomplete thread section shortened to the limit ■ Capable of fastening to thin plates ■ Low cost ■ Compatible with various head shapes *For more details, please refer to the PDF document or feel free to contact us.

  • nut
  • bolt

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Seat-mounted screw "WIS"

Seat-mounted screw "WIS"

Reduced labor hours for tightening operations! Successfully integrated a washer with functionality into a screw!

"WIS" is a screw with an integrated washer. For thin plates, a play of less than 0.5 pitch below the washer is possible (when a spring washer is included). Additionally, by reducing the diameter of the shaft, interference with the internal thread can also be prevented. There is no risk of the washer falling off, significantly reducing the labor involved in tightening, and automatic tightening becomes easier. 【Features】 ■ Eliminates the hassle and cost of combining screws and washers ■ No waste due to loss of washers ■ No risk of washer falling off, significantly reducing labor in tightening ■ Easier automatic tightening ■ Simplifies purchasing and inventory management, eliminating waste and inconsistencies *For data and material requests, please feel free to contact us through the Yamashina website: http://www.yamashina.ne.jp/

  • bolt
  • Other machine elements

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Seat-mounted screw "Polis"

Seat-mounted screw "Polis"

Omitting the installation of washers! Improved workability with screws that come with built-in resin washers.

"POLIS" is a screw that comes with a pre-installed resin washer. The screw is manufactured by pressing it into a resin washer after the surface treatment is completed, and then inserting it by applying a screwing rotation. This eliminates the need for washer installation, improving work efficiency. It is also used to prevent scratches on the mating material and enhance corrosion resistance. 【Features】 - Eliminates the need for washer installation - Improves work efficiency - Prevents scratches on the mating material - Enhances corrosion resistance - Reduces overall costs *For data and material requests, please feel free to contact us through the Yamashina website: http://www.yamashina.ne.jp/

  • bolt
  • Other machine elements

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Spring washer incorporated screw "TWO LOCK M's"

Spring washer incorporated screw "TWO LOCK M's"

Ideal for delicate painted products! Screws with integrated stainless steel spring washers that excel in corrosion resistance!

"TWO LOCK M's" is a screw that incorporates a TWO LOCK washer. Compared to conventional spring washers, it has a wavy shape, which provides greater spring resistance and is more resistant to loosening. Additionally, its unique shape minimizes the biting into the counterpart material during tightening, making it less prone to damage. The washer's low height also means that less tightening is required. Therefore, the screw can be shorter and lighter. We have developed and commercialized this steel TWO LOCK with its advantages intact, using rust-resistant stainless steel material. ● For other functions and details, please download the catalog.

  • nut

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Special Feature Work

Special Feature Work

We accept not only standard products but also special items.

We can accommodate a wide range of special washers with unique sizes and shapes, as well as screws with special shapes. 【Required Information】 ○ Product Details: Product drawings (handwritten is acceptable if details are clear) Dimensions, materials, surface treatment, required quantity ○ Notes: Tolerances, chamfering, etc. Please contact us for more details.

  • bolt
  • Processing Contract
  • Prototype Services

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Production process

Production process

Introduction to the production process! Until the screw is made.

We will introduce the manufacturing process of screws at Sakae Seibyoujo. 1. Cold Forging The material, wound in coils, is cut to the length of the screw. A mold called a punch is pressed to form the head of the screw, and the shaft of the screw is shaped by pressing it into a mold called a die, resulting in the screw blank. ↓ 2. Integrated Rolling A washer is fitted onto the screw blank, and the shaft of the screw is pinched and rubbed together using a mold called a flat die to shape the screw threads, resulting in a screw with an integrated washer. ↓ 3. Surface Treatment Surface treatment is applied to prevent rust on the screws. This improves corrosion resistance and enhances the appearance. ↓ 4. Sorting The finished products are checked for missing washers or contamination with different items, and defective products are removed. ↓ 5. Packaging After inspecting dimensions, screw accuracy, and cross-fitting, the products are packed into boxes. For more details, please contact us.

  • bolt
  • fastener

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Main equipment

Main equipment

Introduction of production equipment!

At Sakae Seibyo, we carry out a consistent process from manufacturing to inspection and packaging through four departments: forging, rolling, sorting, and packaging. Manufacturing takes place at the Shibukawa factory, which is equipped with forging and rolling machines responsible for shaping materials. We stock materials, semi-finished products of screw blanks, and finished products to meet customer demands for short delivery times and small lot sizes. After surface treatment, products are transported to the headquarters, where they are sorted using sorting machines and then proceed to packaging and shipping operations. Our headquarters warehouse stocks boxed products, establishing a system for immediate delivery. 【Production Equipment】 Forging Machines ○ 1D2B: 21 units ○ High-speed 1D2B: 6 units ○ 2D2B: 2 units ○ 2D3B: 1 unit ○ 3D3B: 1 unit Rolling Machines ○ For assembly: 37 units ○ For standalone: 4 units Sorting Machines ○ Image: 3 units ○ Roller: 5 units ○ Parts feeder: 4 units

  • bolt
  • fastener

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Sems screw with washer incorporated

Sems screw with washer incorporated

By incorporating the seat washer into the screw in advance, it prevents forgetting to insert it or losing it!

This is a screw that has a washer incorporated into it in advance to prevent loosening and to avoid the sinking of the seat surface. 【Features】 ■ Since the washer is incorporated before the screw threads are rolled, it will not come off the screw. ■ Eliminates the hassle of inserting the washer and the worry of losing it, thereby improving work efficiency. ■ Prevents forgetting to incorporate the washer into the screw. Please feel free to contact us for more details.

  • Company：ツルガ
  • Price：Less than 10,000 yen
  • bolt

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Screw-related information magazine "Yamarin Newspaper" Issue 132

Screw-related information magazine "Yamarin Newspaper" Issue 132

From custom specification conversion adapters to trivia about screws! We will introduce information related to screws.

This document is issue 132 of the information magazine "Yamarin Newspaper," published by Yamazaki Co., Ltd., which specializes in the sale of screws, general machine tools, custom screw manufacturing, transmission parts sales, and machining. It introduces "special size screws with built-in washers" for small screws and bolts, as well as "custom specification conversion adapters" and "screw trivia." [Contents] ■ Special size screws with built-in washers ■ Custom specification conversion adapters ■ Screw trivia ■ Door to IT (Introductory Edition) No. 11 *For more details, please refer to the PDF document or feel free to contact us.

  • bolt
  • Other work tools
  • others

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Seat insert screw

Seat insert screw

Low cost! High quality! We will meet deadlines strictly!

Our company, as a specialized manufacturer of embedded screws, has been working for many years on reducing the dimensional compression of the "incomplete screw section" that is a drawback of embedded screws. Today, due to the miniaturization and thinning of industrial products, the thickness of fastening components has also decreased, and we have received numerous inquiries asking, "Can the incomplete screw section be compressed?" In response, we have researched technology that can produce screws in large quantities stably without compromising the original functionality of the screw, such as reducing axial force, and we are now able to fasten even very thin materials. 【Product Line】 ■ Various types of end processing ■ Various types of anti-loosening processing ■ Various types of bagging processing ■ Various standard products (pan, bind, truss, upset, trimmer, flange, etc.) ■ Low head sems, etc. *For more details, please feel free to contact us.

  • Contract manufacturing

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Seat metal embedded screw "Full Lock Screw"

Seat metal embedded screw "Full Lock Screw"

The definitive version of thin plate sems!!! Can be fastened to any thin plate!

The Full Lock Screw is a washer-integrated screw designed for fastening ultra-thin plates. Typical washer-integrated screws have an incomplete threaded section of about 2 pitches, which prevents thin plates from being securely tightened. However, the Full Lock Screw has no incomplete threaded section, allowing it to securely tighten even the thinnest materials. It is compatible with sizes from M2.5 to M6. 【Features】 - The screw's shaft diameter is smaller than the inner diameter of the nut, allowing for fastening to thin plates without contacting the nut. - It can be completely fastened even to products without fastening elements, such as terminal blocks. For more details, please contact us or download the catalog.

  • bolt

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Thin plate mounting screw "Cero Gap"

Thin plate mounting screw "Cero Gap"

Fully seated! No gaps! Stainless steel washer-integrated screws for thin plates.

The "Cero Gap" is a washer-integrated screw that can tighten without any gaps, even with thin sheet materials. Due to cost reduction and weight reduction, thin sheet materials are in demand, but conventional washer-integrated screws create gaps and cannot securely tighten thin sheet materials. This product has a relief groove under the head (below the washer), allowing for complete seating. 【Features】 ■ Torque strength: M4 ... 3.63Nm * The strength is based on our torsion test results. JIS standard M4 ... 2.70N.m or more. * For more details, please refer to the PDF document or feel free to contact us.

  • bolt

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Seat bolt assembly screw (semis)

Seat bolt assembly screw (semis)

Automatically incorporating the seat cushion significantly improves work efficiency!

We handle "washer-integrated screws (Semus)" that incorporate flat washers or spring washers under the heads of small screws. Our automatic assembly machine is dedicated to long lengths, allowing for a head shape of M4 and M5, with lengths ranging from 54 to 160 mm. We have a proven track record of manufacturing in various materials, including iron and stainless steel. 【Features】 ■ Head shapes of M4 and M5 ■ Lengths can be processed from 54 to 160 mm ■ Proven manufacturing in various materials, including iron and stainless steel ■ Washers do not come off after integration due to rolling ■ Significantly improves work efficiency *For more details, please download the PDF or feel free to contact us.

  • Other consumables

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