#5-40 x 3/8 Inch Coarse Black Oxide Medium Carbon Steel Flat Head Socket Cap Screw USA Best Seller 3/8-16 X 1 SQ HD

3/8-16 X 1 SQ HD MACH BLT PLN

& Split Lock Washers

Finish: Zinc Inside Diameter: 3/8 Inch

3 Hole Black Plastic

Most effective in clean diesel and engine oils

#5-40 x 3/8 Inch Coarse Black Oxide Medium Carbon Steel Flat Head Socket Cap Screw USA Best Seller 3/8-16 X 1 SQ HDSocket head cap screws are commonly used in machine assembly for removable panels and parts. They have a round cap with a hex head and are tightened with a socket wrench drive. Longer caps are easier to see when fastened while button and flat head caps are less likely to snag clothing or linkages. Cap screws with a black oxide or armor coat finish resist corrosion.