2-1/4" stud bolts in 347 stainless, with two heavy hex nuts each, delivered in five days for unplanned maintenance
2-1/4"-8 UN × 22" stud bolts in ASTM A193 B8C Class 1, each with two A194 Grade 8C heavy hex nuts. The studs were single-point thread cut, the nuts machined from round bar and milled into a hexagon, and the order delivered in five days.
What the customer needed.
Unplanned maintenance called for 2-1/4"-8 UN × 22" stud bolts in 347 stainless: ASTM A193 Grade B8C Class 1 studs, each with two ASTM A194 Grade 8C heavy hex nuts.
B8C is 347 stainless bolting stabilized with niobium against sensitization, for hot hydrogen, refinery and welded stainless service between 800 and 1500 °F.
The parts.
2-1/4"-8 UN × 22" stud bolts in ASTM A193 B8C Class 1, each supplied with two ASTM A194 Grade 8C heavy hex nuts.
The studs were single-point thread cut. The nuts were machined from round bar and milled into a hexagon.
How it turned out.
The studs and nuts were delivered in five days.
A193 B8C Class 1 calls for 75 ksi minimum tensile and 30 ksi minimum yield at all diameters, so the same grade holds from small studs up to this size.
What the job involved.
Single-point threads
The 2-1/4"-8 UN stud threads single-point cut.
Nuts from round bar
The 8C heavy hex nuts machined from round bar, then milled into a hexagon.
Delivered
Studs and nuts delivered five days after the order.