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The grade 5 steel hex bolt has a plain finish and an external hex drive, and meets American Society of Mechanical Engineers ASME B18.2.1 and Society of Automotive Engineers SAE J429 specifications. Grade 5 steel, composed of quenched and tempered medium carbon steel, is often used in applications where strength is the primary concern. The material is magnetic. The external hex drive has six flat sides that a wrench can grip to turn the screw from the side, enabling use when there is no space above the head for a driver.Cap screws and hex bolts are threaded fasteners with thick hex-shaped heads that can be used with threaded nuts or in areas with limited clearance above the tapped (threaded) hole. Cap screws have slightly different dimensions than hex bolts and have a washer face underneath their unflanged hex head to act as a large bearing surface against the mating material. Grade 5 steel is often used in applications where strength is the primary concern Plain surface has no finish or coating External hex drive tightens from the side with a wrench, enabling use when there is no space above for a driver Meets ASME B18.2.1 and SAE J429 specifications UPC 082893735634 Brand Small Parts Model 846016 Size Name 1/4 -20 Unit Count 100.0 Count Part Number B005KMU9LS Thread Size 1/4 -20 Thread Type Un Drive System External Hex Grade Rating Grade 5 Manufacturer Brighton Best Thread Class 2A Thread Style Right Hand Fastener Size #10-12 Fastener Type Hexagon Bolt Item Hardness Grade 5 Material Type Alloy Steel Exterior Finish Plain Item Dimensions 2.25 inches Number Of Items 100 Thread Coverage Partially Threaded Screw Head Style Hex Manufacturer Grade Grade 5