6 x 1/2 MS21318 Military Round Head Type U Drive Screw Cadmium MSL188 The 1" Internal Tooth Lock

The 1" Internal Tooth Lock Washer Black Oxide is a high-quality washer that is designed to prevent loosening of nuts and bolts due to vibration or movement

The screw is 2 1/2 inches long and has a diameter of 3/8 inch

and the serrated edges help to prevent the screw from slipping

The Phillips indented hex washer head allows for easy driving and prevents cam-out

preventing loosening or vibration

6 x 1/2 MS21318 Military Round Head Type U Drive Screw Cadmium MSL188 The 1" Internal Tooth LockThese 6 x 1 2 MS21318 Military Round Head Type U Drive Screws are made of steel and have a cadmium finish. They are designed for use in aircraft and other military applications. The screws have a round head and a Type U drive, which is a slotted drive that is designed to be used with a screwdriver. The screws are 6 inches long and have a diameter of 1 2 inch. They are sold in packs of 100.