It has a hexagonal drive at one end and a cup-shaped indentation at the other end

7/16-14 x 3 L9 Hex Cap Screw Yellow Zinc Plated Domestic USA (50)

L9® High Tension SAE pattern flat washers are designed for use in high stress

7/8-9 x 2 1/2 Socket Set Screw Cup Point Alloy

10-12 x 1 1/2 Phillips Pancake Panel Clip Screws Zinc Plated - Carton (3000)

5/16-18 x 3 1/2 Grade 5 Hex Cap Screw Plain Domestic USA (450) 6-Lobe Bugle-Head Decking Screws 305 Stainless Steel It has a hexagonal drive5 16 18 x 3 1 2 Grade 5 Hex Cap Screw Plain Domestic USA (450). 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