Grade 5 Steel Serrated-Flange Hex Head Screw

Description Head Type Hex Screw Features Flanged Locking Type Serrations Drive Style External Hex System of Measurement Inch Thread Direction Right Hand Thread Size 5/16“-18 Screw Size Decimal Equivalent 0.3125″ Thread Type UNC Thread Fit Class 2A Length 3/4“ Threading Fully Threaded Thread Spacing Coarse Head Width 1/2“ Height 21/64“ Flange Diameter 11/16“ Fastener Strength Grade/Class Grade 5 Material Zinc-Plated Steel Tensile Strength 110,000 psi Hardness Rockwell C22 Specifications Met IFI 111, SAE J429 RoHS RoHS 3 (2015/863/EU) Compliant REACH REACH (EC 1907/2006) (06/14/2023, 235 SVHC) Compliant DFARS Specialty Metals COTS-Exempt Country of Origin India, Peoples Republic of China, South Korea, Taiwan, or Vietnam Schedule B 731815.9000 ECCN EAR99 Made from Grade 5 steel, these screws are suitable for fastening most machinery and equipment. Serrations under the head grip the material surface for mild vibration resistance, and the flange distributes pressure where the screw meets the surface, eliminating the need for a separate washer. Material meets SAE J429 specifications for quality. Dimensions meet IFI 111 specifications. Grade 5 steel hex head screws are marked with three radial lines. Head height includes the flange. Length is measured from under the flange. Zinc-plated steel screws resist corrosion in wet environments. Match the thread spacing of mating components. Coarse threads are the industry standard; choose these screws if you don’t know the threads per inch.