These Alligator anchors with flange nylon expand within a solid surface to help with distributing weight

8-32 x 5/16 Phillips Flat 82 Undercut Machine Screw Black Zinc Plated (10

That's why it's holding up the sprinkler system in the Tokyo subway

3/8-24 x 1 1/4 L9 Hex Cap Screw Yellow Zinc Plated Domestic USA (100)

one-piece screw anchor

3/4-10 x 3 1/4 Grade 8 Hex Cap Screw Plain Domestic USA (25) Jobber Drill Bits - Fractional These Alligator anchors with flange3 4 10 x 3 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