Horizon Inc.

SEMS screws are machine screws with lock washers pre-attached to save users assembly time. They combine two separate parts into one pre-assembled, low cost fastener. With washers under the head, SEM fasteners allow for fast installation, permanence, and easy adaptability to many applications. 

SEMS can be used anywhere where a screw and washer(s) are required. Our SEMS fasteners are made to a very high quality standard, with full traceability.