Nimonic 80A Stud Bolts
ASME B18.31.2ASTM B637
Nimonic 80A stud bolts pair a precipitation-hardened nickel-chromium alloy with double-ended closure for steam bonnet, heat-exchanger, and hanger joints under sustained heat and cyclic load. The alloy resists creep and relaxation.
- MOQ
- 100PCS
- Samples · typical
- ~20 days
- Production · typical
- 25–35 days
- Heat treatment
- Solution treated and aged
EN 10204 3.1 MTC + heat-number traceability
Which standard is on your order?
Raw Material Specifications
Threads · Metric
Threads · Inch
Dimension Reference
Heat Treatment
Solution treated and agedSolution treatment prepares the alloy for controlled precipitation aging, which develops the strength of the ordered condition.
What we can make in Nimonic 80A
Fully threaded
Two nuts clamp the flange or cover; usable thread length spans the assembled grip.
Double-end
A plain centre spans the grip, with a threaded portion at each end for the nuts.
Tap-end
One end engages a tapped casing; the exposed end accepts the cover nut.
- Threads
- Metric · UNC · UNF · 8UN · UNJ
- Forms
- Continuous thread · Double-end · Tap-end
- Final condition
- Solution treated and aged
- Inspection
- Thread size and fit; overall and effective thread length; end geometry; lot identification.
Manufacturing route
CNC machining suits samples and special end forms. Repeat lots use cut-to-length stock with rolling or cutting selected for the ordered thread and material condition.
Heat treatment & final condition
Solution treatment and the specified aging condition are recorded against the production lot; final dimensions are checked after thermal processing.
Finished geometry
End lengths, runout and effective thread engagement are checked separately from overall length; tap ends are gauged to their own fit requirement.
Where Nimonic 80A fits — and what matters
High-pressure steam valve bonnets
Nimonic 80A Stud BoltsOn hot valve bonnets, Nimonic 80A studs combine precipitation-hardened strength with a removable nut-and-cover arrangement. The studs can stay installed while the bonnet is lifted for maintenance. Their specified heat treatment establishes the material condition used for the hot tensile load.
Connection requirements
- Bonnet joint thickness, gasket type, and required preload
- Stud diameter, overall length, and nut engagement at each end
- Temperature range, cycling duty, and heat-number certification
Boiler tube hangers & superheaters
Nimonic 80A Stud BoltsNimonic 80A is used for high-temperature support hardware, including boiler tube supports. In stud form, it can connect hanger brackets and threaded support ends while carrying sustained load. Nuts allow adjustment and assembly from accessible faces without rotating the complete support member.
Connection requirements
- Hanger assembly thickness, load, and required preload
- Stud diameter, overall length, and nut engagement at each end
- Temperature range, cycling duty, and heat-number certification
Heat-exchanger & reactor covers
Nimonic 80A Stud BoltsHot exchanger cover studs guide the cover and transmit its clamping load through removable nuts. Nimonic 80A provides precipitation-hardened elevated-temperature properties for this selected bolting duty. Its value is in the hot load path; the particular process chemistry determines whether exposed studs also need another corrosion-resistant alloy.
Connection requirements
- Cover joint thickness, gasket type, and required preload
- Stud diameter, overall length, and nut engagement at each end
- Temperature range, cycling duty, and heat-number certification
Same stud. Different material priorities.
Nimonic 80A material dataInconel 718 Stud Bolts
Inconel 718 studs carry high tensile loads in turbine casings and hot valve bonnets where the hole pattern limits fastener size. Precipitation hardening supplies strength, and removable nuts provide service access. Sour-gas connections additionally require the prescribed heat-treatment and hardness condition.
Inconel X-750 Stud Bolts
Inconel X-750 studs suit hot bonnet, casing and tie connections under sustained tension. Their precipitation treatment is selected for temperature and load duration. Accessible end nuts allow the load to be applied or released without rotating the stud during assembly and maintenance.
Nimonic 75 Stud Bolts
Nimonic 75 studs anchor moderate-load furnace retainers, auxiliary covers and burner brackets. Oxidation resistance is useful on the exposed hot portions. The fixed mounting arrangement allows nuts and attached components to be removed while the furnace-side stud remains in place.
From drawing to documented delivery
- 01Drawing & BOMForm, dimensions and quantity
- 02Material & formingGrade, heat and manufacturing route
- 03Final inspectionGeometry, threads and ordered tests
- 04Documents & dispatchLot records and identified packing
Order documents
- Material identity
- UNS N07080 · heat number · ordered condition
- Final-part acceptance
- Lot-linked aging record and mechanical acceptance in the final condition.
- Dimensional record
- Thread size and fit; overall and effective thread length; end geometry; lot identification.
- Traceability
- EN 10204 3.1 material certificate · production lot · identified packing
Matching Kit
Flange Stud Bolt Kits
Build your Nimonic 80A stud enquiry
Questions about Nimonic 80A stud bolts & threaded rods
Does changing the stud alloy also change the nut selection?
The nut needs compatible internal threads, sufficient engaged height and a specified material condition. Select lubricant or surface treatment with the stud–nut pair, because assembly friction affects the preload obtained from tightening.