Sems screws can be easily identified by their free spinning lock washer that is pre-assembled with the screw. The washer is assembled to the screw before the threading is cut. A screw and washer are two different components that are typically purchased separately. However, with a sems screw, these two components are available as one single product, helping enterprises save both time and money on their fastening applications.
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Most enterprises prefer these screw types because it helps them save efforts on sourcing and assembling these two components separately. Thus, process and assembly efficiencies are a given with this permanent assembly of a screw and a washer.