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3/4-10 x 3" heavy hex head bolts - $280 (Ronkonkoma)
856 Johnson Ave
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Material: Low-carbon steel (similar to A36 round bar stock), with chemical composition per ASTM A307: max 0.30% C, 0.52% Mn, 0.040% P, 0.050% S.
Grade: ASTM A307 Grade B—intended for heavy hex configuration in flanged piping; minimum tensile strength: 60–100 ksi (full-size), proof load: 40 ksi; hardness: B45–B50 (Rockwell).
Finish: Hot-dipped galvanized (HDG) per ASTM A153 Class C, providing a minimum 1.0 oz/ft² zinc coating for superior outdoor corrosion resistance; suitable for exposed or wet environments but pair with compatible nuts/washers to avoid hydrogen embrittlement.
Design: Heavy hex head for higher wrenching torque and better bearing surface; fully or partially threaded shank; no integrated washer (use separately for load distribution).