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

50 x 45 Hex Cap Screw DIN 933 A2 (18-8) Stainless Steel - DIN 933 A2 Hex Cap Screws are manufactured from A2-70 stainless steel per ISO 3506 part 1

3/4-10 x 5 1/2 Simpson Wedge Anchor 316 SS (10)

It is manufactured from 18-8 (A2) Stainless Steel

1/4-20 x 2 1/4 Grade 8 Hex Cap Screw Plain Domestic USA (100) M12-1.75 Socket Cap Screws 12.9 Alloy Plain DIN 912 Typical hardness on diameters of1 4 20 x 2 1 4 Grade 8 Hex Cap Screw Plain 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 diameters 1 4