Lag screws longer than 12 inches will have a minimum thread length of 50% of the screw length up to a maximum of 8 inches

3/8-16 x 3/4 L9 Hex Cap Screw Yellow Zinc Plated Domestic USA (1200)

When a screw reaches the collar

8 x 1 5/8 Phillips Flat Particle Board Screw Plain & Lubed - Carton (5

1 1/8-12 x 3 Socket Cap Screw Alloy

1-14 x 4 1/2 Grade 8 Hex Cap Screw Plain Domestic USA (10) Hex Washer Head Metal-Panel Screws 316 Stainless Steel Lag screws longer than 121 14 x 4 1 2 Grade 8 Hex Cap Screw Plain Domestic USA (10). 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