3-1/2"-8 UN x 25-1/4" Studbolt with Tommy-Hole Nut

3-1/2"-8 UN × 25-1/4" end-to-end studbolt in ASTM A193 B16 with a 3-1/2"-8 UN heavy hexagon nut with tommy holes, manufactured in the USA.

Studs are cut from certified bar, threaded by rolling or single-point cutting to the class called out, and chamfered and marked before they leave. Double-end and tap-end patterns, special lengths and drilled or coated variants are all made to the drawing.

About the material: Vanadium-strengthened Cr-Mo bolting that holds its strength where B7 starts to relax — steam turbines, HP steam flanges and hot valve bonnets. Read the A193 B16 data page →