The nylon flange head adds stability in hollow surfaces

9/16 x 13 ITM SDS Max Hammer Drill Bit

5/8-11 x 2 1/2 Button Socket Cap Screw Alloy

7/16 x 12 High Speed Aircraft Bit Cobalt

1/2-20 x 3 Socket Set Screw Cup Point Alloy

9/16-12 x 1 1/4 Grade 8 Hex Cap Screw Plain Domestic USA (25) 5/16 Cotter Pins 18-8 Stainless Steel The nylon flange head adds9 16 12 x 1 1 4 Grade 8 Hex Cap Screw Plain Domestic USA (25). 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