SEMS Screws | Combining Efficiency with Reliability

 

Product Overview

SEMS screws are fasteners that integrate a screw and washer along the same axis through a specialized mechanical process. Once assembled, the washer remains freely rotatable. This design allows the screw to come pre-equipped with a washer, effectively shortening assembly time and reducing the risk of rework caused by misplaced or lost washers.

Depending on application requirements, SEMS screws can be paired with various washer types, including:

  • Flat washer

  • Lock washer

  • Spring washer

  • External tooth washer

  • Internal tooth washer

For applications with strict hardness requirements, both the screw and washer must undergo separate heat treatment before assembly to ensure durability and stable performance.

Key Advantages

  • All-in-one solution – Screw and washer are pre-assembled, eliminating the need for additional components during installation.

  • Error reduction – Prevents assembly issues caused by incorrect washer orientation or mismatched sizes.

  • Enhanced productivity – Improves installation efficiency, ideal for high-volume, repetitive assembly tasks.

  • Customizable options – A variety of head styles, washer types, and materials can be tailored to meet different industry needs.

Common Head Styles & Drive Types

  • Head styles: Flat, Round, Oval, Pan, Truss, Hex Washer Head, Hex Head

  • Drive types: Torx, Phillips, Pozidriv, Hex Socket, Slotted

  • Pin-type designs are also common in specialized applications.

Available Washer Standards

  • DIN 6902, DIN 6903, DIN 6904, DIN 6905, DIN 6907, DIN 6908

  • Custom washer dimensions and shapes are available upon request

Manufacturing Process

  1. Screw forming (without thread rolling) → Washer insertion → Assembly and thread rolling

  2. Screw and washer undergo separate heat treatment → Washer insertion → Assembly and thread rolling

  3. Critical quality control: For specified hardness requirements, both screw and washer must be heat-treated prior to assembly to ensure the finished product meets performance standards. 

 

Applications of SEMS Screws 

SEMS screws are widely used in automotive, electronics, household appliances, industrial machinery, and construction. Their integrated washer design ensures consistent clamping force, making them ideal for high-volume production lines, vibration-prone environments, and precision assembly operations.

 

 

 2025-08-11