1-8 x 5 1/2 Hex Cap Screw SS 18-8 (A2)

Typical hardness on diameters of 1/4 to 1 inch is HRC 25-34

7/16-14 x 5 1/2 Socket Cap Screw Alloy

7/32 x 12 High Speed Aircraft Bit Cobalt

1/4-28 x 1 1/2 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (100) Jobber Drill Bits - Cobalt 1-8 x 5 1/2 Hex1 4 28 x 1 1 2 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (100) . 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