2-3/4"-8 UN-3B Special Heavy Hex Nut

Special Heavy Hex Nut Size: 2-3/4"-8-3B Style: Drilled & beveled Material: ASTM A193 B7 alloy steel Precision-machined for strength in critical bolted joints and extreme service conditions.

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 workhorse alloy-steel bolting grade for flanges, valves and pressure equipment — 125 ksi tensile, quenched and tempered 4140. Read the A193 B7 data page →