5/16"-18x7/8",(FT) Grade 5 Hex Head Cap Screw, ZINC CR+3 (INCH) (Quantity: 100) Size: 5/16"-18 | Length: 7/8" | | Fully Threaded

Core Hardness: 1/4 through 1 in. diameter, all lengths: Rockwell C25 - C34 | 1-1/8 through 1-1/2 in. diameter, all lengths: Rockwell C19 - C30. Surface Hardness: 1/4 through 1 in. diameter, all lengths: Rockwell 30N54 maximum. | 1-1/8 through 1-1/2 in. diameter, all lengths: Rockwell 30N50 maximum. Proof Load: 1/4 through 1 in. diameter, all lengths: 85,000 psi. | 1-1/8 through 1-1/2 in. diameter, all lengths: 74,000 psi. Yield Strength*: - 1/4 through 1 in. diameter, all lengths: 92,000 psi. minimum | 1-1/8 through 1-1/2 in. diameter, all lengths: 81,000 psi. minimum Tensile Strength: 1/4 through 1 in. diameter, all lengths: 120,000 psi. minimum | 1-1/8 through 1-1/2 in. diameter, all lengths: 105,000 psi. minimum Elongation* - 14% minimum (all diameters) Reduction of Area* 35% minimum (all sizes)