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

37/64 x 6 Reduced Shank Drill Bit (1/2 Shank)

41/64 x 6 Reduced Shank Drill Bit Cobalt (1/2 Shank)

10 x 2 1/2 Simpson Flat-Head Deck-Drive™ DWP Wood Screws - 6-Lobe Drive 316 SS - Bulk Carton (1750)

1/4-20 x 4 1/2 Grade 5 Hex Cap Screw Plain Domestic USA (50) 1/2-13 Hex Cap Screws 18-8 Stainless Steel USS pattern flat washers are1 4 20 x 4 1 2 Grade 5 Hex Cap Screw Plain Domestic USA (50). 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