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As part of our specialty fastening solutions, we manufacture a range of SEMS fasteners suitable for automotive and electronic assembly applications. SEMS fasteners can be produced in a combination of screw and captivated washer assemblies. Captivated washers help in eliminating instances of lost or dropped washers during assembly operations, which in turn improves productivity. We have the ability to manufacture SEMS screw and washer assemblies in various combinations based on your specific head style, washer style, material, thread style, and plating type requirements.

Our preassembled SEMS fasteners are available in standard lengths up to 6” with pitch values up to 18tpi. Besides standard sizes, we can also manufacture specialty fasteners according to your custom dimensional needs. Some of our washer types include external tooth, internal tooth, combination of internal/external tooth, flat, and doomed washers. For severe environments, washers can be manufactured from stainless steel. Based on your fastening needs, we can also produce washers from materials such as plastic or neoprene.

 Specifications   Equipment List   

Screw Sizes

#8-32 through 9/16-18 (M4-M16)


1/4" to 6"

Washer Materials

Plastic or Neoprene
Stainless Steel

Washer Types

Belleville Conical
Combination External/Internal Tooth


External Tooth


Helical Spring or Countersunk

Internal Tooth


Low Carbon Steel
Medium Carbon Steel

Alloy Steel

Stainless Steel – 300 and 400 series, A286, B16

Testing Capabilities

Drive Test

Hydrogen Embrittlement

Rockwell Hardness Testing

Superficial Hardness Testing

Tensile Test

Processing Capabilities

Camera Inspection
Eddy Current


Laser Sorting

Visual Sorting

Special Features

Roll Forming

Roll Thread After Heat Treat



Industries Served


Consumer Electronics



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