M3-0.5X30 ISO 7045 Metric Phil Pan Internal Washer Sems Machine Screw Full Thread Zinc (Pack Qty 5,000) BC-MI330IPP

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 internal tooth variety is recommended when it is desirable to hide the teeth for appearance or to prevent snagging Screw - Internal Tooth Lockwasher- Class 4.8 Steel: C1008 or equivalent carbon steel. C1050 Carbon Steel. Screw - Internal Tooth Lockwasher- Stainless: A2 Stainless