4"-8 UN-2B Special Nut

A 4" 8UN 2B Special Nut (ASTM A194 Grade 16) made to meet a customer’s specs. Custom work like this is what we do! Built for jobs that require more than a standard part.

Nuts are machined from bar or hex stock, tapped to the thread class specified, and heat treated where the grade requires it. Heavy hex, jam, castellated, cap, seal and coupling patterns are turned in-house, so special dimensions cost no more than standard ones.

About the material: The Cr-Mo-V heavy hex nut that matches A193 B16 studs — for steam turbine and high-temperature steam flange bolting. Read the A194 16 data page →