Incoloy 800H Slotted & castle nuts
DIN 935-1ASTM B408
Incoloy 800H castle and slotted nuts combine controlled-carbon, coarse-grain performance for creep duty with visible pin retention. The cross-hole, pin and nut slots complete the system; the nut’s material condition governs its loaded thread.
- 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
Slotted nut
Use on drilled shafts and pins where a cotter pin retains the nut after adjustment. Slots in the hex body provide a lower axial envelope when the installation has limited clearance.
Castle nut
Use the raised slotted crown to position the cotter-pin path above the wrenching body. The crown needs clearance beyond the bearing assembly or linkage end.
Pin alignment
For wheel, pivot and linkage assemblies, align the slots with the cross-hole using the assembly’s preload or end-play procedure. The pin retains the nut; it does not set the bearing adjustment.
- Retention
- Slots · Split pin
- Mating part
- Cross-drilled bolt or shaft
- Patterns
- Slotted · Castellated
- Threads
- Metric · Inch
- Final condition
- Solution annealed
- Inspection
- Slot width · Crown height · Pin clearance · Threads
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
Fixture pivots and conveyor shaftsIncoloy 800H slotted & castle nuts retain fixture pivots and conveyor shafts with a split pin through the nut slots and a cross-drilled shaft. Slot alignment establishes the final positive-retention position. Hot dwell, thermal expansion and repeated furnace cycles set the working load.
Power & Turbines
Hot-duct linkage pins and damper spindlesIncoloy 800H slotted & castle nuts retain hot-duct linkage pins and damper spindles with a split pin through the nut slots and a cross-drilled shaft. Slot alignment establishes the final positive-retention position. Hot dwell and start-stop expansion act on the supported or moving component.
Chemical Processing
Reformer support pins and heater-fixture rodsIncoloy 800H slotted & castle nuts retain reformer support pins and heater-fixture rods with a split pin through the nut slots and a cross-drilled shaft. Slot alignment establishes the final positive-retention position. These parts work in the heated equipment zone, where sustained loading and thermal expansion govern their section and clearance.
Same slotted & castle 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
- Slot width · Crown height · Pin clearance · Threads
- Traceability
- EN 10204 3.1 material certificate · production lot · identified packing
Build your 800H slotted & castle nut enquiry
Questions about 800H slotted & castle nuts
What must be specified with a castle nut?
The cross-drilled shaft, retaining pin material and slot geometry complete the retention system. Slot alignment follows the assembly tightening procedure; the pin does not generate the joint’s clamp load.