A square head screw threaded the entire length

3/4-10 x 4 1/2 Hex Tap Bolt 18-8 (A2) Stainless Steel

#13 x 6 High Speed Aircraft Bit Cobalt

1 1/2-6 x 4 Socket Set Screw Cup Point Alloy

3" F436 Flat Washer HDG

7/16-20 x 1 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (650) USS Flat Washers Zinc Plated A square head screw threaded7 16 20 x 1 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (650) . 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