904L Thin hex nuts
ISO 4035ASTM A276
Limited axial space is the reason to use a 904L thin nut. Its molybdenum- and copper-bearing resistance to selected acids must be paired with the reduced thread engagement and the intended locking arrangement.
- 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?
Raw Material Specifications
Threads · Metric
Threads · Inch
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 904L
Reduced-height body
Use in compact adjustment mechanisms and panel assemblies where axial clearance rules out a full-height nut. Check the required proof load against the reduced engagement rather than selecting on clearance alone.
Jam-nut arrangement
Use with a second nut to lock an adjustment on a threaded shaft or linkage. The specified nut order and tightening sequence are part of the locking arrangement, not simply two nuts tightened independently.
- Pattern
- Thin hex · Jam nut
- Key dimensions
- Thread · Across flats · Height
- Threads
- Metric · UNC · UNF
- Assembly
- Adjusters · Paired nuts
- Final condition
- Solution annealed
- Inspection
- Nut height · Across flats · Thread plug gauging
Manufacturing route
Small lots use machined blanks. Volume nut blanks use a forming route compatible with the alloy before machining the bore and tapping.
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.
Finished geometry
Internal thread gauging, usable engagement and bearing-face alignment are checked after final processing.
Where 904L fits — and what matters
Chemical Processing
Pump shafts and mixer-drive parts904L thin hex nuts serve as jam or retaining nuts on pump shafts and mixer-drive parts where axial space is limited. Their reduced thread engagement is part of the retention design. Process liquid can remain at the contact after the exposed surface drains.
Pumps, Valves & OEM
Valve stems and pump-drive collars904L thin hex nuts serve as jam or retaining nuts on valve stems and pump-drive collars where axial space is limited. Their reduced thread engagement is part of the retention design. Repeated maintenance makes fit, engagement and access part of the component specification.
Mining & Mineral Processing
Dosing-pump shafts and agitator-drive parts904L thin hex nuts serve as jam or retaining nuts on dosing-pump shafts and agitator-drive parts where axial space is limited. Their reduced thread engagement is part of the retention design. Leach solution and deposits act on the installed part; corrosion duty is separate from abrasive wear.
Same thin hex nut. Different material priorities.
904L material dataHastelloy C-276
Resistance to chemically aggressive, mixed process streams.
- Connection priority
- Thread load in a reduced-height body
- Process liquid and shutdown chemistry
- C-276 is selected for its nickel–chromium–molybdenum–tungsten chemistry. Residual product, cleaning liquid and oxidising contamination can expose a sheltered connection differently from the main flow. Include liquid retained at the short internal engagement and paired-nut faces in the exposure description.
Inconel 625
Solid-solution strength and resistance to aggressive process liquids.
- Connection priority
- Thread load in a reduced-height body
- 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 short internal engagement and paired-nut faces in the exposure description.
Hastelloy C-22
Corrosion resistance across oxidising and reducing process exposures.
- Connection priority
- Thread load in a reduced-height body
- Production and cleaning cycles
- C-22’s chromium-bearing chemistry is relevant when chemical exposure changes between operating and cleaning cycles. Include both liquids when comparing it with C-276 or a B-type nickel alloy. Include liquid retained at the short internal engagement and paired-nut 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 N08904 · heat number · ordered condition
- Final-part acceptance
- Grade chemistry, supplied condition and ordered mechanical requirements.
- Dimensional record
- Nut height · Across flats · Thread plug gauging
- Traceability
- EN 10204 3.1 material certificate · production lot · identified packing
Build your 904L thin hex nut enquiry
Questions about 904L thin hex nuts
Can a thin nut replace a regular nut at the same load?
Reduced thread engagement changes stripping capacity. Check the reduced-height nut’s material condition and the intended jam-nut arrangement instead of transferring the regular nut’s load assumption.