6-32X5/16 6 Lobe Pan Square Cone 410 Stainless Sems Fully Threaded 18-8 Stainless Steel (Pack Qty 5,000) BC-0605CTP188

A machine screw and free-spinning lock-washer manufactured as one assembly. Steel SEMS are available with the following types of washers: internal tooth, external tooth, split-lock and conical. Stainless SEMS are offered with external tooth lock washers The washer/screw assembly makes this a locking screw with the washer providing the locking action. Machine pre-assembly provides cost savings to the end user. Internal Tooth SEMS: Recommended when it it desirable to hide the teeth for appearance or to prevent snagging. External Tooth SEMS: Preferred over the internal tooth style as the teeth provide greater torsional resistance being on the larger radius