Incoloy 825 Belleville disc springs
EN 16983ASTM B424
Incoloy 825 disc springs put nickel–chromium–molybdenum–copper corrosion resistance 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
- Annealed
EN 10204 3.1 MTC + heat-number traceability
Which standard is on your order?
Raw Material Specifications
Dimension Reference
Heat Treatment
AnnealedThe specified anneal restores ductility and the corrosion-resistant supplied condition after hot or cold working.
What we can make in Alloy 825
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
- Annealed
- 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
The final annealed or specified strengthened condition is linked to the lot; an aging treatment is not assumed for a solid-solution alloy.
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 825 fits — and what matters
Chemical Processing
Mixer drives and process-equipment bracketsIncoloy 825 disc spring / belleville washers form preload stacks in the bolted mounts of mixer drives and process-equipment brackets. Working deflection allows the stack to accommodate movement while maintaining the designed spring force. Process liquid can remain at the contact after the exposed surface drains.
Pumps, Valves & OEM
Actuator mounts and pump baseplatesIncoloy 825 disc spring / belleville washers form preload stacks in the bolted mounts of actuator mounts and pump baseplates. Working deflection allows the stack to accommodate movement while maintaining the designed spring force. Repeated maintenance makes fit, engagement and access part of the component specification.
Mining & Mineral Processing
Leach-equipment and dosing-skid supportsIncoloy 825 disc spring / belleville washers form preload stacks in the bolted mounts of leach-equipment and dosing-skid supports. Working deflection allows the stack to accommodate movement while maintaining the designed spring force. Leach solution and deposits act on the installed part; corrosion duty is separate from abrasive wear.
Same disc spring. Different material priorities.
Incoloy 825 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 718
Precipitation-hardened strength for compact, highly loaded connections.
- Connection priority
- Force at working deflection and relaxation during dwell
- 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 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 N08825 · 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
- Free height · Thickness · Load–deflection
- Traceability
- EN 10204 3.1 material certificate · production lot · identified packing
Build your 825 disc spring enquiry
Questions about 825 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.