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We stock a wide variety of fasteners ideal for many applications arround the home, farm, business, automotives, and in industry. Most of our fasteners have a light zinc plating over steel giving a more rust resistant finsh. We also sell coated and stainless products for additional rust resistance. We stock many grades of fasteners ranging from low carbon steel on up to hardened, heat treated steel. Not all fasteners are applicable for all applications so be certain to test thouroughly and get the opinion of a licensed building or certified building or structural engineer before relying on these fasteners for any situations where failure would result in damage to property or person. Diameter: 5/16 Length: 1-1/2 inch Material: Steel Finish: Zinc Head Style: Square (1/2 Wrench) UPC 014973312015 ASIN B00L1L2L5O Brand Hard-to-Find Fastener Color Silver Model 014973312015 Head Type Square Size Name 5/16-18x 1-1/2 Metal Type Alloy Steel Unit Count 1 Count Item Weight 4.16 ounces Part Number SHBS2-036-10 Thread Size 5/16 -18 Thread Type Unc Drive System Square Finish Types Zinc Grade Rating Grade 2 Manufacturer Hard-to-Find Fastener Thread Class 1 Thread Style Right Hand, UNC Coarse Fastener Size 5/16-18 x 1-1/2 Fastener Type Square Head Bolt Item Diameter 0.31 inches Item Hardness Grade 2 Material Type Alloy Steel Exterior Finish Zinc Item Dimensions 2.5 x 1.62 x 1.44 inches Number Of Items 10 Thread Coverage Partially Threaded Number of Pieces 10 Outside Diameter 0.31 inches Screw Head Style Square Screw Point Style Square Manufacturer Grade Grade 2 Maximum Shear Strength 350-450 MPa Compatible Groove Diameter 0.31 inches