Incoloy 800 Split lock washers
ASME B18.21.1
Incoloy 800 split washers need an elastic recovery requirement alongside heat and oxidation resistance for thermal equipment. 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
- Annealed
EN 10204 3.1 MTC + heat-number traceability
Which standard is on your order?
Dimension Reference
Heat Treatment
AnnealedAnnealing reduces work hardening and restores ductility for the specified supplied condition.
What we can make in Alloy 800
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
- Annealed
- 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
The ordered annealed or solution-treated state is retained in the lot record; forming and machining do not replace the specified thermal condition.
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 800 fits — and what matters
Furnaces & Heat Treatment
Heat-treatment fixturesIncoloy 800 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 800 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 800 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 800 material dataIncoloy 800
UNS N08800 · Current grade- 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- 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 N08800 · heat number · ordered condition
- Final-part acceptance
- Grade chemistry, supplied condition and ordered mechanical requirements. 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 800 split lock washer enquiry
Questions about 800 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.