3/8-16 x 2 1/2 Coarse Thread Socket Set Screw Cup Plain RTT It has a coarse thread

It has a coarse thread pitch of 18 threads per inch and a diameter of 5/16 inches

This 5/16-18 x 3/8 Serrated Hex Flanged Washer Full Thread Screw is made of 18-8 stainless steel

They have a square head that sits flush with the wood surface and a threaded shank that extends through the wood

They have a flat head with no nibs and a deep thread design for increased holding power

5/16-18 x 3/4 Hex Cap Screw 18-8 Stainless Steel:

3/8-16 x 2 1/2 Coarse Thread Socket Set Screw Cup Plain RTT It has a coarse threadThe 3 8 16 x 2 1 2 Coarse Thread Socket Set Screw Cup Plain is a headless screw with a cup point and a coarse thread. It is made of steel and has a plain finish. The screw is 2 1 2 inches long and has a diameter of 3 8 inches. It is used to secure objects in place by being screwed into a pre drilled hole. The cup point provides a bearing surface for the object being secured, and the coarse thread provides a strong hold.