M4-0.7X20 ISO 7045 Metric Phillips Pan External Washer Sems M/S Fully Threaded Zinc/Bake (Pack Qty 2,500) BC-MI420EPP

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 Stainless: Offers same advantages of the steel variety but with superior resistance to corrossion Steel: . C1050 Carbon Steel. C1008 or equivalent carbon