A-286 Double-end studs
ASME B18.31.2
A A-286 double-end stud leaves the installed end in the equipment body while the service nut is removed. Its aged iron–nickel alloy strength for hot bolting must cover the trapped body-end interface as well as the exposed end.
- 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
Finished-Stud Specifications
Threads · Metric
Threads · Inch
Dimension Reference
Heat Treatment
Solution treated and agedSolution treatment is followed by precipitation aging, with the Grade 660 class defining the required heat-treatment route and final properties.
What we can make in A-286
Clamping stud
Use for through-bolted covers and housings with access to both nuts. The plain grip spans the joint; independently sized threaded ends accommodate unequal nut-side clearances.
Tap-end stud
Use on valve bonnets and machine housings opened repeatedly for maintenance. The insertion end remains in the body while the outer nut is removed, reducing repeated wear of the housing thread.
- Thread systems
- Metric · UNC · UNF · 8UN · UNJ
- Geometry
- Two threaded ends · Plain shank
- Assembly
- Nut-to-nut · Tap-end
- Final condition
- Solution treated and aged
- Inspection
- End thread lengths · Shank diameter · Thread gauging
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 A-286 fits — and what matters
Furnaces & Heat Treatment
Retort and furnace-access coversA-286 double-end studs connect retort and furnace-access covers through a threaded body end and an accessible nut end. The plain shank spans the cover grip. Hot dwell, thermal expansion and repeated furnace cycles set the working load.
Power & Turbines
Hot-gas access covers and inspection closuresA-286 double-end studs connect hot-gas access covers and inspection closures through a threaded body end and an accessible nut end. The plain shank spans the cover grip. Hot dwell and start-stop expansion act on the supported or moving component.
Chemical Processing
Reformer access covers and hot-gas inspection closuresA-286 double-end studs connect reformer access covers and hot-gas inspection closures through a threaded body end and an accessible nut end. The plain shank spans the cover grip. These parts work in the heated equipment zone, where sustained loading and thermal expansion govern their section and clearance.
Same double-end stud. Different material priorities.
A-286 material dataIncoloy 800HT
Tightly controlled carbon and Al + Ti for creep duty.
- Connection priority
- Tension through the grip and load transfer into the housing
- N08811 material control
- 800HT tightens the 800-family chemistry around creep performance. Its solution-treated, coarse-grain condition and N08811 identity should remain linked through forming and final acceptance. At the body-end thread inside the tapped housing, the relevant metal temperature can differ from the process or furnace set point.
Inconel 718
Precipitation-hardened strength for compact, highly loaded connections.
- Connection priority
- Tension through the grip and load transfer into the housing
- Strength after aging
- Machine-stock properties and final aged properties describe different states. The final heat-treatment lot and mechanical results establish the strength available in the installed part. At the body-end thread inside the tapped housing, the relevant metal temperature can differ from the process or furnace set point.
310S
Low-carbon heat resistance in oxidation-exposed equipment.
- Connection priority
- Tension through the grip and load transfer into the housing
- 310S is not 310H
- S31008 is the low-carbon grade. For a component under sustained hot load, distinguish that specification from the controlled-carbon creep purpose of S31009. At the body-end thread inside the tapped housing, the relevant metal temperature can differ from the process or furnace set point.
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 S66286 · heat number · ordered condition
- Final-part acceptance
- Lot-linked aging record and mechanical acceptance in the final condition.
- Dimensional record
- End thread lengths · Shank diameter · Thread gauging
- Traceability
- EN 10204 3.1 material certificate · production lot · identified packing
Build your A-286 double-end stud enquiry
Questions about A-286 double-end studs
Can both ends use the same thread designation?
They can, but the body end may require a different fit or engagement from the nut end. Record each end separately, including a different pitch or interference requirement where the equipment drawing uses one.