Incoloy 800H Long-shank flange bolts
ISO 4162ASTM B408
The long grip and integral bearing flange give Incoloy 800H bolts two distinct interfaces to control. Controlled-carbon, coarse-grain performance for creep duty must be paired with the required shank length, flange footprint and final condition.
- 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
Flanged head
Use on deep mounting brackets and thick equipment stacks where a wide head seat distributes the clamp load. Check the flange diameter against casting recesses and nearby ribs before specifying a larger head.
Extended grip
The extended plain grip can span spacers and thick components while the thread engages beyond them. Match grip length to the assembled stack so the nut can reach its seat without stopping at the thread runout.
- Head
- Integral flange
- Shank
- Extended plain grip
- Length basis
- Under flange
- Threads
- Metric · UNC · UNF · UNJ
- Final condition
- Solution annealed
- Inspection
- Thread gauges · Head and shank dimensions
Manufacturing route
CNC machining suits samples and small lots. Cold heading or hot forging is selected for volume production according to alloy formability, head section and size.
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
Head geometry, bearing face, shank and thread fit are checked after the final machining and thermal operations.
Where 800H fits — and what matters
Furnaces & Heat Treatment
Heat-treatment fixturesIncoloy 800H long-shank flange bolts span thick spacers or mounting sections in heat-treatment fixtures, combining an extended grip with a flange bearing face. Hot dwell, thermal expansion and repeated furnace cycles set the working load.
Power & Turbines
Boiler-duct supports and hot auxiliary bracketsIncoloy 800H long-shank flange bolts span thick spacers or mounting sections in boiler-duct supports and hot auxiliary brackets, combining an extended grip with a flange bearing face. Hot dwell and start-stop expansion act on the supported or moving component.
Chemical Processing
Reformer tube-support and heater fixturesIncoloy 800H long-shank flange bolts span thick spacers or mounting sections in reformer tube-support and heater fixtures, combining an extended grip with a flange bearing face. These parts work in the heated equipment zone, where sustained loading and thermal expansion govern their section and clearance.
Same long-shank flange bolt. 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
- Thread gauges · Head and shank dimensions
- Traceability
- EN 10204 3.1 material certificate · production lot · identified packing
Build your 800H long-shank flange bolt enquiry
Questions about 800H long-shank flange bolts
Which dimensions keep the flange and long grip working together?
The flange seat fixes one end of the stack; plain grip and runout fix where the threaded section begins. Specify both against the actual stack thickness so the nut tightens on the parts rather than reaching the end of usable thread.