M3-0.5X8 ISO7045 Phil Pan 410SS External Tooth Washer Sems Full Thread 18 8Stainless Steel (Pack Qty 2,000) BC-MI38EPP188

Steel: 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. The external tooth variety offers greater torsional resistance than an internal tooth Sems. Offers same advantages of the steel variety but with superior resistance to corrossion