Incoloy 800H Tall flange nuts
ISO 4161ASTM B408
A tall Incoloy 800H flange nut extends the usable thread envelope and spreads the seating load. The grade brings controlled-carbon, coarse-grain performance for creep duty, while engagement depth and flange contact determine the assembled fit.
- MOQ
- 100PCS
- Samples · typical
- ~20 days
- Production · typical
- 25–35 days
- Heat treatment
- Solution annealed
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 annealedThe specified solution treatment develops the controlled grain structure needed for sustained high-temperature creep duty.
What we can make in Alloy 800H
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 annealed
- 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
The final solution-treated condition and grain-size requirement are recorded for the ordered H or HT grade. Final dimensions are inspected after the last thermal operation.
Finished geometry
Internal thread gauging, usable engagement and bearing-face alignment are checked after final processing.
Where 800H fits — and what matters
Furnaces & Heat Treatment
Heat-treatment fixturesIncoloy 800H 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 bracketsIncoloy 800H 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 fixturesIncoloy 800H 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.
Incoloy 800H material dataIncoloy 800
UNS N08800- Carbon
- ≤0.10%
- What changes
- General heat and oxidation resistance; no grain-size requirement in the family comparison.
Incoloy 800H
UNS N08810 · Current grade- Carbon
- 0.05–0.10%
- What changes
- Controlled carbon and coarse-grain condition for creep and stress-rupture duty.
Incoloy 800HT
UNS N08811- Carbon
- 0.06–0.10%
- What changes
- Tighter carbon and Al + Ti control (0.85–1.20%), with solution treatment and coarse grain for creep duty.
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 N08810 · heat number · ordered condition
- Final-part acceptance
- UNS grade, carbon and alloy chemistry, solution-treatment record and ordered grain-size evidence.
- Dimensional record
- Height · Flange diameter · Thread engagement · Gauging
- Traceability
- EN 10204 3.1 material certificate · production lot · identified packing
Build your 800H tall flange nut enquiry
Questions about 800H 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.