Square drive prevents cam out and stripping

The slots are for the insertion of a cotter pin to secure the nut when used with a drilled shank fastener

1/4-28 x 2 Grade 8 Hex Cap Screw Plain Domestic USA (1200)

#53 Heavy Duty Jobber Drill Bit

5/8-11 x 3 1/2 Grade 8 Hex Cap Screw Plain Domestic USA (100)

3/8-16 x 1 1/2 Grade 5 Hex Cap Screw Plain Domestic USA (675) Nail-In Anchors Nylon Square drive prevents cam out3 8 16 x 1 1 2 Grade 5 Hex Cap Screw Plain Domestic USA (675). Grade 5 Hex Cap Screws are manufactured in the USA from medium carbon steel. Our Grade 5 material meets or exceeds SAE J429 Grade 5 specifications. All products are manufactured with rolled threads. Typical hardness on diameters 1 4 to 1 inch is HRC 25 34. On diameters over 1 inch to 1 1 2 hardness will range from HRC 19 30. Tensile strength for diameters 1 4 to 1 inch is a minimum of