A-286 Tall flange nuts
ISO 4161
A tall A-286 flange nut extends the usable thread envelope and spreads the seating load. The grade brings aged iron–nickel alloy strength for hot bolting, while engagement depth and flange contact determine the assembled fit.
- 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 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
Body height: regular / tall
- Regular height
- Fits compact equipment covers and mounting brackets where clearance above the nut is limited.
- Tall body
- Provides longer thread engagement on clamping studs in jigs, fixtures and machine-tool setups that are tightened and released repeatedly.
Bearing face: plain / serrated
- Plain face
- For painted covers and finished equipment faces where serration marks are unwanted.
- Serrated face
- For metal mounting brackets where teeth can bite directly into the seat to resist rotation.
All configurations shown are available on request.
- Body
- Extended height
- Bearing
- Integral flange
- Threads
- Metric · Inch
- Key dimensions
- Height · Flange diameter · Across flats
- Final condition
- Solution treated and aged
- Inspection
- Height · Flange diameter · Thread engagement · Gauging
Manufacturing route
Small lots use machined blanks. Volume nut blanks use a forming route compatible with the alloy before machining the bore and tapping.
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
Internal thread gauging, usable engagement and bearing-face alignment are checked after final processing.
Where A-286 fits — and what matters
Furnaces & Heat Treatment
Heat-treatment fixturesA-286 tall flange nuts retain the threaded connections on heat-treatment fixtures, combining increased nut height with an integral bearing flange. Hot dwell, thermal expansion and repeated furnace cycles set the working load.
Power & Turbines
Boiler-duct supports and hot auxiliary bracketsA-286 tall flange nuts retain the threaded connections on boiler-duct supports and hot auxiliary brackets, combining increased nut height with an integral bearing flange. Hot dwell and start-stop expansion act on the supported or moving component.
Chemical Processing
Reformer tube-support and heater fixturesA-286 tall flange nuts retain the threaded connections on reformer tube-support and heater fixtures, combining increased nut height with an integral bearing flange. These parts work in the heated equipment zone, where sustained loading and thermal expansion govern their section and clearance.
Same tall flange nut. Different material priorities.
A-286 material dataIncoloy 800HT
Tightly controlled carbon and Al + Ti for creep duty.
- Connection priority
- Thread engagement over the tall body and flange bearing
- 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 extended internal thread and broad flange underside, 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
- Thread engagement over the tall body and flange bearing
- 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 extended internal thread and broad flange underside, the relevant metal temperature can differ from the process or furnace set point.
310S
Low-carbon heat resistance in oxidation-exposed equipment.
- Connection priority
- Thread engagement over the tall body and flange bearing
- 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 extended internal thread and broad flange underside, 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
- Height · Flange diameter · Thread engagement · Gauging
- Traceability
- EN 10204 3.1 material certificate · production lot · identified packing
Build your A-286 tall flange nut enquiry
Questions about A-286 tall flange nuts
Does greater nut height automatically increase joint capacity?
Capacity depends on the engaged threads, nut condition and stud strength, as well as load distribution. Extra unengaged height does not add thread engagement and does not create prevailing torque.