Hardness: Rockwell hardness ranges from B68 to C32

Tensile strength on diameters 1/4 to 2 1/2 inches is a minimum of 150

1-8 x 4 Hex Tap Bolt 18-8 (A2) Stainless Steel

15/32 x 12 High Speed Long Boy

5/16-18 x 3 1/2 Grade 8 Hex Cap Screw Plain Domestic USA (50) Powers Nail-in Anchors Stainless Steel Hardness: Rockwell hardness ranges from5 16 18 x 3 1 2 Grade 8 Hex Cap Screw Plain Domestic USA (50). Grade 8 Hex Cap Screws are manufactured in the USA from medium carbon alloy steel. In diameters 1 4 to 1 1 2 inches our Grade 8 material meets or exceeds SAE J429 Grade 8 specifications. Diameters over 1 1 2 inches meet or exceed ASTM A354 Grade BD. All material is manufactured with rolled threads. Yellow zinc plated bolting will meet or exceed ASTM F1941. Typical hardness on diameters 1 4