Screws and bolts with captive washers that have external threads.

SEMS screws combine multiple parts, such as a captive washer and screw, into one versatile fastener, providing design and manufacturing efficiencies. This reduces part numbers and saves assembly time on the production floor. Additionally, it allows for increased bearing surface compared to traditional cold headed parts. With only one part to inventory, track, and assemble.

It was a significant advancement when screws and washers were pre-assembled into SEMS screws, featuring a locked-in free-spinning washer due to the larger screw thread compared to the washer hole. Our company offers a wide range of SEMS screws in various sizes, styles, head types, drives, materials, and other options to meet your specific application needs. Additionally, double-washer SEMS screws are commonly designed and manufactured for cost-effectiveness while providing strong holding strength in electrical and electronic applications.