nylon will begin to deteriorate at temperatures of 150°-350°F so they are not recommended for high temperature service

1 1/2-6 x 18 Socket Cap Screw Alloy

which means you can place them close to each other without having to worry about compromising structural integrity

1 9/32 x 6 Reduced Shank Drill Bit Cobalt (1/2 Shank)

Ideal for applying trim

3/4-10 x 3 Grade 8 Hex Cap Screw Plain Domestic USA (25) Grade 2 Square Nuts Plain nylon will begin to deteriorate3 4 10 x 3 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 to 2