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while the external Sems washer ensures a tight seal against the mounting surface
It is suitable for use with M4 screws or bolts
It features a square pan head that provides a secure hold and prevents slipping during installation
Its square neck prevents the bolt from turning while tightening
It has a 1/4" diameter
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.
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