5/16"-18x1",(FT) Grade 5 HEX Head Serrated Flange Screw, ZINC CR+3 (INCH) (Quantity: 100) Size: 5/16"-18 | Length: 1" | | Fully Threaded

DESCRIPTION: An unslotted hex head screw (bolt) with unified thread pitch and a flange that has serrations on the bearing surface side. APPLICATIONS: Designed for use in applications where loosening forces are present, such as vibration. The serrations grip to the bearing surface so that significantly more torque is needed to loosen than to tighten the screw. Flange provides more strength than a standard machine screw. Eliminates need for a lockwasher or locknut in certain applications. MATERIAL: Medium Carbon Steel. HEAT TREATMENT: Screws heated, oil or water quenched, and tempered at a minimum tempering temperature of 800 degrees Fahrenheit.