Nuclear fasteners & bolting.
Large studs, nuts and bolting of the kind used on reactor vessels, steam generators and pumps.
Nuclear plant bolting is large, closely specified and fully documented: closure studs and nuts, manway and handhole studs, pump main flange studs. We manufacture studs, nuts and bolting to your drawings and specifications, with material certification to the heat.
See where the bolts go.
Reactor Vessel Closure
Instrument port studs and nuts, closure studs, closure nuts, spherical washers, lifting lug pins and support anchor bolts and nuts.
Steam Generator
Primary manway, secondary manway, handhole cover, inspection port cover and support pad studs and nuts, plus column anchor bolts and nuts.
Reactor Coolant Pump
Main flange and small-bore flange studs and nuts, plus seal housing bolts, motor stand bolts, coupling bolts and nuts, motor hold-down bolts and nuts, support column and tie rod pins and tie rods and nuts.
Grades nuclear runs on.
ASTM A193 Grade B7
The workhorse alloy-steel bolting grade for flanges, valves and pressure equipment — 125 ksi tensile, quenched and tempered 4140.
ASTM A193 / ASME SA-193ASTM A193 Grade B16
Vanadium-strengthened Cr-Mo bolting that holds its strength where B7 starts to relax — steam turbines, HP steam flanges and hot valve bonnets.
ASTM A453 / ASME SA-453ASTM A453 Grade 660 (A-286)
A-286 bolting for the hottest joints — 130 ksi at room temperature and rated by stress-rupture at 1200 °F, for gas and steam turbines, exhaust and high-temperature process equipment.
ASTM B637 bar · AMS 5662 / 5663 · API 6A CRAInconel 718 (UNS N07718)
The premier high-strength nickel superalloy — 185 ksi tensile and 150 ksi yield from cryogenic temperatures to 1200 °F, with corrosion and sour-gas resistance to match.
ASTM A1082 bolting · ASTM A564 bar17-4 PH Stainless (Type 630, UNS S17400)
The high-strength stainless — up to 190 ksi in H900, or 115 to 135 ksi with real toughness in the H1150 conditions — for pump shafts, valve stems, subsea and aerospace fasteners.
Jobs we’ve made in these grades.
