The 3/8" anchor solution approved for 3 ¼" concrete thickness: The Strong-Bolt 2 anchor can be installed in cracked concrete with a minimum thickness of 3 ¼"

3/4-10 x 2 Flat Socket Cap Screw 18-8 (A2) Stainless Steel

3/4-10 x 3 1/2 Socket Set Screw Cup Point Alloy

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

1 7/8-8 A194 2H Heavy Hex Nut Hot Dipped Galvanized

7/16-20 x 2 1/4 Grade 8 Hex Cap Screw Plain Domestic USA (50) 7/8-14 Socket Set Screws Cup Point Alloy The 3/8" anchor solution approved7 16 20 x 2 1 4 Grade 8 Hex Cap Screw Plain Domestic USA (50). 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