Incoloy 925 Flat washers
ISO 7089 / ISO 7090
For Incoloy 925 washers, age-hardened strength combined with process-corrosion resistance is only useful with a bearing section that stays flat under load. Bore, outside diameter and thickness match the head or nut to the supported member.
- 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?
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 925
Normal series
Use under bolt heads and nuts on machined equipment faces with adequate surrounding seat area. The bore must clear the bolt shank and under-head radius so the washer lies flat.
Larger outside diameter
Use over slots, oversized holes and softer mounting surfaces to spread the bearing load. Washer thickness matters as well as diameter: a thin wide washer can dish over an unsupported opening.
Square & special profiles
Use on channel supports, slotted bases and special mounting pads where a round washer leaves insufficient support. Profile and hole position keep the bearing plate seated across the actual opening.
- Geometry
- Bore × outside diameter × thickness
- Forms
- Round · Square · Drawing profiles
- Function
- Bearing surface · Spacing
- Sizing
- Metric · Inch
- Final condition
- Solution treated and aged
- Inspection
- Bore · Outside diameter · Thickness · Burrs
Manufacturing route
Small lots can be machined from suitable stock; repeat production uses cut or punched blanks with bore and outer edge finishing.
Heat treatment & final condition
Solution treatment and the specified aging condition are recorded against the production lot; final dimensions are checked after thermal processing.
Finished geometry
Final condition and hardness are chosen for bearing load, then flatness and parallel faces are checked after thermal processing.
Where 925 fits — and what matters
Offshore & Marine
Deck-equipment brackets and marine pump skidsIncoloy 925 flat washers spread bolt or nut bearing load across deck-equipment brackets and marine pump skids, protecting the seating surface and bridging the specified hole clearance. The assembled contact is exposed to saltwater, deposits and neighbouring metals.
Water Treatment & Desalination
Membrane-skid and pump supportsIncoloy 925 flat washers spread bolt or nut bearing load across membrane-skid and pump supports, protecting the seating surface and bridging the specified hole clearance. The water stream, cleaning cycle and retained liquid define exposure at the installed part.
Oil & Gas
Utility skids and instrument supportsIncoloy 925 flat washers spread bolt or nut bearing load across utility skids and instrument supports, protecting the seating surface and bridging the specified hole clearance. Utility connections and pressure-boundary parts have separate acceptance requirements on the equipment drawing.
Same washer. Different material priorities.
Incoloy 925 material dataInconel 625
Solid-solution strength and resistance to aggressive process liquids.
- Connection priority
- Bearing pressure and resistance to dishing
- 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 two bearing faces and the bore around the shank in the exposure description.
Super Duplex 2507
Super-duplex strength and resistance to chloride pitting.
- Connection priority
- Bearing pressure and resistance to dishing
- Final duplex structure
- S32750 chemistry and final solution treatment belong together. Forming, section size and cooling affect the structure represented by the mechanical and corrosion records. Include liquid retained at the two bearing faces and the bore around the shank in the exposure description.
Monel K-500
Age-hardened strength in the nickel–copper alloy family.
- Connection priority
- Bearing pressure and resistance to dishing
- Strength and hydrogen exposure
- K-500 gains strength through aging. Cathodic protection, hydrogen exposure and the ordered condition need joint consideration in highly loaded marine components. Include liquid retained at the two bearing faces and the bore around the shank 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 N09925 · heat number · ordered condition
- Final-part acceptance
- Lot-linked aging record and mechanical acceptance in the final condition.
- Dimensional record
- Bore · Outside diameter · Thickness · Burrs
- Traceability
- EN 10204 3.1 material certificate · production lot · identified packing
Build your 925 washer enquiry
Questions about 925 flat washers
Should the washer use the same alloy as the bolt?
The wetted assembly may need matching corrosion resistance, but the washer also needs sufficient bearing strength and thickness. The bolt grade does not by itself specify a hardened or load-rated washer.