Incoloy 800HT Split lock washers
ASME B18.21.1
Incoloy 800HT split washers need an elastic recovery requirement alongside tightly controlled carbon and Al + Ti for creep duty. Section shape and final temper control compression behaviour; the assembly’s locking method is a separate design choice.
- MOQ
- 100PCS
- Samples · typical
- ~20 days
- Production · typical
- 25–35 days
- Heat treatment
- Solution annealed (≥1149°C / 2100°F)
EN 10204 3.1 MTC + heat-number traceability
Which standard is on your order?
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 800HT
Free state
The open helical shape supplies initial spring travel as a screw or nut is tightened. Free height and section size determine how much travel is available before the washer becomes flat.
Clamped state
Once flattened, little spring travel remains to compensate for settling. For an assembly needing controlled preload travel, compare a disc spring; for a vibration-critical joint, select a locking method validated for that joint.
- Form
- Split helical ring
- Key dimensions
- Bore · Section · Free height
- Assembly
- Under nut or bolt head
- Sizing
- Metric · Inch
- Final condition
- Solution annealed (≥1149°C / 2100°F)
- Inspection
- Bore · Section width and thickness · Free height
Manufacturing route
Wire or profiled section is formed into the helical ring; the split, section and free height are controlled before final condition checks.
Heat treatment & final condition
Solution annealing at a minimum of 1149°C (2100°F) establishes the coarse-grain condition used for creep resistance. The heat-treatment record and grain-size result identify this delivery state.
Working performance
Annealed corrosion-resistant stock is not automatically spring stock. The ordered temper or strengthening route must demonstrate the required recovery and load at working deflection.
Where 800HT fits — and what matters
Furnaces & Heat Treatment
Heat-treatment fixturesIncoloy 800HT split lock washers fit under a bolt head or nut on heat-treatment fixtures when the assembly drawing calls for a helical washer. Compression and recovery belong to the washer specification. Hot dwell, thermal expansion and repeated furnace cycles set the working load.
Power & Turbines
Boiler-duct supports and hot auxiliary bracketsIncoloy 800HT split lock washers fit under a bolt head or nut on boiler-duct supports and hot auxiliary brackets when the assembly drawing calls for a helical washer. Compression and recovery belong to the washer specification. Hot dwell and start-stop expansion act on the supported or moving component.
Chemical Processing
Reformer tube-support and heater fixturesIncoloy 800HT split lock washers fit under a bolt head or nut on reformer tube-support and heater fixtures when the assembly drawing calls for a helical washer. Compression and recovery belong to the washer specification. These parts work in the heated equipment zone, where sustained loading and thermal expansion govern their section and clearance.
Same split lock washer. Different material priorities.
Incoloy 800HT 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- Carbon
- 0.05–0.10%
- What changes
- Controlled carbon and coarse-grain condition for creep and stress-rupture duty.
Incoloy 800HT
UNS N08811 · Current grade- 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 N08811 · heat number · ordered condition
- Final-part acceptance
- UNS grade, carbon and alloy chemistry, solution-treatment record and ordered grain-size evidence. Load–deflection and permanent-set results for the specified spring geometry.
- Dimensional record
- Bore · Section width and thickness · Free height
- Traceability
- EN 10204 3.1 material certificate · production lot · identified packing
Build your 800HT split lock washer enquiry
Questions about 800HT split lock washers
Does corrosion-resistant stock automatically make a spring washer?
The stock needs a condition that provides the required elastic recovery. Record the final temper, compression behaviour and permanent set; a chemistry certificate alone does not describe the spring response.