Sems(R) type screws are regular screws to which one or more washers have been placed under the head before the fastener is threaded. These washers become captivated and serve as a light-duty locking mechanism. Almost any non-countersunk screw can be made in a Sems(R)-style.

These fasteners are available in steel and stainless from stock. Many more sizes and configurations are available. Just ask your sales representative. If you don't see it, we can have it made for you! Washers that can be attached include flat washers, split lock washers, internal tooth lock washers, external tooth lock washers, fender washers, internal/external combination lock washers, and many more.

Check out our vast selection of Sems(R)-style screws and contact or call us at 1-800-432-8979 for answers and recommendations. In business for 65+ years, we are industry experts.