5/16-18 x 3/8 Coarse Thread Socket Set Screw Cup Plain MRTF188 while the external Sems washer

while the external Sems washer ensures a tight seal against the mounting surface

These nuts conform to DIN 934 standards

It is suitable for use with M4 screws or bolts

while the Phillips flat head allows for easy installation using a standard Phillips screwdriver

It features a square pan head that provides a secure hold and prevents slipping during installation

5/16-18 x 3/8 Coarse Thread Socket Set Screw Cup Plain MRTF188 while the external Sems washer5 16 18 x 3 8 Coarse Thread Socket Set Screw Cup Plain is a headless screw with a hexagonal socket drive and a plain finish. It is made of steel and has a coarse thread pitch of 18 threads per inch. The screw has a diameter of 5 16 inch and a length of 3 8 inch. It is used to secure objects in place and can be tightened or loosened with a hex key.