4" SA-320 L43 studs to drawing, one length with an oil groove, sent hot-shot with acorn nuts and washers
A hot-shot set of 4"-8 UN-2A studs to drawing in SA-320 Grade L43, at 669 mm and 745 mm long, the 745 mm stud with an oil groove, supplied with 4"-8 UN acorn nuts and washers in SA-194 Grade 7.
What the customer needed.
The drawing called for 4" studs in SA-320 Grade L43 on an inch thread, in two metric lengths, with an oil groove on the longer stud, plus matching acorn nuts and washers. The set was needed hot-shot.
SA-320 L43 is 4340 low-temperature bolting. 4" is the largest diameter for which the grade lists its 125 ksi minimum tensile and 105 ksi minimum yield.
The parts.
4"-8 UN-2A studs in SA-320 Grade L43, 669 mm and 745 mm long, the 745 mm stud with an oil groove.
Supplied with 4"-8 UN acorn nuts and 162 mm OD × 105 mm ID × 8 mm washers in SA-194 Grade 7, the companion nut grade for L43.
How it turned out.
A complete set of studs, acorn nuts and washers, made to the drawing and sent hot-shot.
The L43 grade calls for 125 ksi minimum tensile and 105 ksi minimum yield up to 4", with a Charpy impact requirement of 20 ft·lbf average at −150 °F.
