no pre-drilling is required

1-8 x 3 1/4 Hex Cap Screw SS 316 (A4)

27/64 x 12 High Speed Aircraft Bit Cobalt

5/8-11 x 1 1/4 Socket Cap Screw 316 Stainless Steel

1 3/8-6 x 18 Socket Cap Screw Alloy

1/4-28 x 1 1/4 Grade 8 Hex Cap Screw Plain Domestic USA (100) 1/2-20 Socket Cap Screws 18-8 Stainless Steel no pre-drilling is required1 4 28 x 1 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