Sems

SEMS screws were originally developed in the 1930s and once referred to as pre-assembled washers and screws. The name has been shortened to SEMS screws, and they are a type of screw that that comes complete with a pre-assembled free-spinning lockwasher. Purchasing these two components as one unit is convenient and assures you always have both the screw and the matching washer on hand. In addition to the low cost of SEMS screws, the pre-assembled washer makes the screw usable in a range of applications and allows for easy fastening. SEMS screws are available in both metric and inch sizes, with both slotted heads and Philips heads, and in a range of sizes and finishes. The SEMS screws can also be purchased with external tooth washers or internal washers, as well as many other types as required for your needs.

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