Stainless Steel 310H Split lock washers
ASME B18.21.1
Stainless Steel 310H split washers need an elastic recovery requirement alongside controlled-carbon stainless performance for sustained hot loading. 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
EN 10204 3.1 MTC + heat-number traceability
Which standard is on your order?
Dimension Reference
Heat Treatment
Solution annealedSolution annealing and rapid cooling retain alloying elements in solution and restore the specified corrosion-resistant condition.
What we can make in Stainless Steel 310H
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
- 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 310H fits — and what matters
Furnaces & Heat Treatment
Heat-treatment fixturesStainless Steel 310H 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 bracketsStainless Steel 310H 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 fixturesStainless Steel 310H 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.
Stainless Steel 310H material dataInconel X-750
Age-hardened strength and a choice of hot-service heat treatments.
- Connection priority
- Elastic recovery after compression
- Spring treatment versus bolting treatment
- X-750 has several heat-treatment routes. The route for retained spring force is selected around relaxation and working stress; a bolting strength requirement calls for its own specified condition. At the split edges and compressed contact faces, the relevant metal temperature can differ from the process or furnace set point.
Inconel 718
Precipitation-hardened strength for compact, highly loaded connections.
- Connection priority
- Elastic recovery after compression
- Strength after aging
- Machine-stock properties and final aged properties describe different states. The final heat-treatment lot and mechanical results establish the strength available in the installed part. At the split edges and compressed contact faces, the relevant metal temperature can differ from the process or furnace set point.
Inconel 625
Solid-solution strength and resistance to aggressive process liquids.
- Connection priority
- Elastic recovery after compression
- Annealed or solution-annealed 625
- The delivery condition affects strength and high-temperature response. Keep the specified condition with the component’s mechanical acceptance; 718-style aging is not the strengthening route for 625. Include liquid retained at the split edges and compressed contact faces in the exposure description.
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 S31009 · 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 310H split lock washer enquiry
Questions about 310H 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.