City officials wanted to make sure that the sprinklers would stay up during an earthquake

This eliminates the need for precisely drilled hole depths and allows for easier flush installation

7/8-9 x 5 Hex Tap Bolt 18-8 (A2) Stainless Steel

1-8 x 12 Grade 5 Hex Cap Screw Zinc Plated

00 x 70 Flat Socket Cap Screw 12

7/8-9 x 6 1/2 Grade 8 Hex Cap Screw Plain Domestic USA (30) Short Arm Hex Keys Alloy City officials wanted to make7 8 9 x 6 1 2 Grade 8 Hex Cap Screw Plain Domestic USA (30). 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