5/16" x 1/2" Socket Head Shoulder Bolts
ASTM A193 B8 Class 1 (304). Machined to the customer's drawing in our Houston shop.
5/16" x 1/2" (1/4-20 UNRC-3A) Socket Head Shoulder Bolts, manufactured to ASTM A193 B8 Class 1 (304SS) and built to ANSI B18.3 standards—delivering dependable precision, strength, and corrosion resistance for demanding assemblies.
Special socket products are machined from bar where the specification allows, with the socket broached and the threads rolled, or cut where the specification or order allows, then heat treated and plated as the specification requires. Shoulder, low-head, flat-head and set-screw patterns follow ASME B18.3 unless the drawing says otherwise.
About the material: 304 stainless bolting — Class 1 for corrosion resistance and cryogenic-to-1500 °F service, Class 2 strain hardened to 125 ksi for strength. Read the A193 B8 Class 1 data page →
