1"-8 x 3‑1/2" Heavy Hex Cap Screw – A307 Grade B, Coarse Thread (PT), Zinc CR+3 (U.S.A.)

Heavy‑duty 1"-8 x 3‑1/2" A307 Grade B heavy hex cap screw, manufactured in the U.S.A. and finished with a Zinc CR+3 coating for enhanced corrosion resistance and long‑lasting durability in demanding environments. Features partial coarse threading (PT) for improved shear strength and secure load engagement, paired with a heavy hex head offering increased wrenching area and superior load distribution. Ideal for construction, structural connections, industrial machinery, anchoring applications, and any project requiring strong, reliable hardware with added corrosion protection.