Inconel 718 Belleville disc springs
EN 16983ASTM B670
Inconel 718 disc springs put precipitation-hardened strength for compact, highly loaded connections into a flexing preload element. Working force, installed height and final material condition define the part more usefully than free diameter alone.
- MOQ
- 100PCS
- Samples · typical
- ~20 days
- Production · typical
- 25–35 days
- Heat treatment
- Solution treated / solution treated and aged
EN 10204 3.1 MTC + heat-number traceability
Which standard is on your order?
Raw Material Specifications
Dimension Reference
Heat Treatment
Solution treated; aged when specifiedSolution treatment prepares 718 for forming or machining, and subsequent aging develops the strength required by the ordered condition.
What we can make in Alloy 718
Single disc
Use under a fastener or in a preload mechanism when a short axial space must provide spring force. Select by load at working deflection, not by bore and outside diameter alone.
Series stack
Alternate disc orientation when a joint needs more travel to accommodate thermal movement or seating loss. Total travel increases at approximately the single-disc load; guides keep the stack aligned.
Parallel stack
Nest discs in the same orientation when the available travel is small but more spring force is needed. Load rises at approximately the single-disc deflection, with friction affecting the real load-deflection response.
- Form
- Conical disc
- Key dimensions
- Bore · Outside diameter · Thickness
- Spring definition
- Free height · Load–deflection
- Stacking
- Single · Series · Parallel
- Final condition
- Solution treated · solution treated and aged
- Inspection
- Free height · Thickness · Load–deflection
Manufacturing route
Disc blanks are cut and formed to the required cone height; thickness and edge quality control stress distribution through the working travel.
Heat treatment & final condition
Solution treatment and the specified aging condition are recorded against the production lot; final dimensions are checked after thermal processing.
Working performance
The spring heat-treatment condition is selected for working stress and temperature. Load at working deflection and permanent set are acceptance characteristics.
Where 718 fits — and what matters
Furnaces & Heat Treatment
Heat-treatment fixturesInconel 718 disc spring / belleville washers form preload stacks in the bolted mounts of heat-treatment fixtures. Working deflection allows the stack to accommodate movement while maintaining the designed spring force. Hot dwell, thermal expansion and repeated furnace cycles set the working load.
Power & Turbines
Boiler-duct supports and hot auxiliary bracketsInconel 718 disc spring / belleville washers form preload stacks in the bolted mounts of boiler-duct supports and hot auxiliary brackets. Working deflection allows the stack to accommodate movement while maintaining the designed spring force. Hot dwell and start-stop expansion act on the supported or moving component.
Chemical Processing
Reformer tube-support and heater fixturesInconel 718 disc spring / belleville washers form preload stacks in the bolted mounts of reformer tube-support and heater fixtures. Working deflection allows the stack to accommodate movement while maintaining the designed spring force. These parts work in the heated equipment zone, where sustained loading and thermal expansion govern their section and clearance.
Same disc spring. Different material priorities.
Inconel 718 material dataInconel X-750
Age-hardened strength and a choice of hot-service heat treatments.
- Connection priority
- Force at working deflection and relaxation during dwell
- 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 loaded disc faces and stack contact edges, 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
- Force at working deflection and relaxation during dwell
- 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 loaded disc faces and stack contact edges 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 N07718 · heat number · ordered condition
- Final-part acceptance
- Lot-linked aging record and mechanical acceptance in the final condition. Load–deflection and permanent-set results for the specified spring geometry.
- Dimensional record
- Free height · Thickness · Load–deflection
- Traceability
- EN 10204 3.1 material certificate · production lot · identified packing
Build your 718 disc spring enquiry
Questions about 718 disc spring / belleville washers
Can an alloy change preserve the same disc-spring rating?
Elastic modulus, yield behaviour and final condition influence the load–deflection curve. Recalculate and verify the working response for the selected alloy rather than carrying over a same-size steel disc’s rating.