HEX CAP SCREWS GRADE 8Hex Cap Screws feature a hexagon head with a washer face under the head to provide ample bearing surface. Grade 8 are heat treated, high strength carbon steel for high stress applications. These meet SAE J-429 GRADE 8. Hex Cap Screws feature hexagon head with a washer face under the head to provide ample bearing surface. These are low carbon steel, general purpose fasteners.Available in diameters from 1/4" to 3" and lengths up to 30". Head markings for GRADE 8 bolts is radial 6 lines & Mfg Mark.