Inconel X-750 Belleville disc springs
EN 16983AMS 5542 / AMS 5598
X-750 disc springs are specified for preload that must persist through elevated-temperature exposure. Working deflection, stress relaxation and the selected spring heat treatment define the stack, rather than free height alone.
- MOQ
- 100PCS
- Samples · typical
- ~20 days
- Production · typical
- 25–35 days
- Heat treatment
- 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 and agedSolution treatment prepares the alloy for controlled precipitation aging, which develops the strength of the ordered condition.
What we can make in Alloy X-750
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 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 X-750 fits — and what matters
Furnaces & Heat Treatment
Heat-treatment fixturesInconel X-750 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 X-750 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 X-750 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 X-750 material dataInconel 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 N07750 · 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 X-750 disc spring enquiry
Questions about X-750 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.