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Phillips Pan Head SEMS Screws - Internal Tooth Lock Washer
Machine Screws with Free-Spinning Lock Washers
Phillips Pan Head SEMS screws in this selection are essentially a machine screw with a pre-assembled internal tooth lock washer. The lock washer is free spinning and sits below the head of the screw. SEMS screws are valued for saving time on production lines, and the hassle of losing matching parts. Internal Tooth SEMS screws are often used over other styles of locking screws when the locking teeth need to be hidden for appearance, or there is a chance of external locking mechanisms snagging.
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