USS pattern flat washers are manufactured from low carbon steel to meet ASTM F844

7/8-9 x 3 1/4 Socket Cap Screw Alloy

1 Hex Key Long Arm Alloy

5/8-11 x 1 1/8 Socket Cap Screw Alloy

5/8-11 x 9 Carriage Bolt SS 18-8 (A2)

3/4-10 x 1 1/2 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (125) M16-2.00 Socket Set Screws Cup Point DIN 916 Black Oxide USS pattern flat washers are3 4 10 x 1 1 2 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (125) . 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