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HEX CAP SCREWS GRADE 5Hex Cap Screws feature a hexagon head with a washer face under the head to provide ample bearing surface. Grade 5 are tempered medium carbon steel. They conform to SAE J-429 GRADE 5. Available in diameters from 1/4" to 2 1/2" and lengths up to 20". Head markings for GRADE 5 bolts is 3 radial lines & Mfg Mark.