Hardness: Rockwell hardness ranges from B68 to C32

14 x 2 1/2 OlyLog® Log Home Fastener (500)

31/32 x 6 Reduced Shank Drill Bit Cobalt (1/2 Shank)

5/8-11 x 7 Hex Cap Screw SS 18-8 (A2)

7/8-9 x 6 1/2 Grade 8 Hex Cap Screw Plain Domestic USA (30)

3/8-16 x 2 1/4 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (450) 5/16-24 Grade 8 Hex Cap Screws Yellow Zinc Plated - Domestic USA Hardness: Rockwell hardness ranges from3 8 16 x 2 1 4 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (450) . 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