Nimonic 75 Heavy Hex Nuts
ASME B18.2.2BS HR 5
Nimonic 75 heavy hex nuts pair a solid-solution nickel-chromium alloy with a larger bearing face for lightly loaded furnace bolt systems. Paired with matching Nimonic 75 bolts and studs, they distribute bearing load and support full thread engagement.
- 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
Threads · Metric
Threads · Inch
Dimension Reference
Heat Treatment
AnnealedAnnealing reduces work hardening and restores ductility for the specified supplied condition.
What we can make in Nimonic 75
Regular hex
Use on equipment covers and mounting brackets with standard socket access. The compact wrenching envelope is useful where adjacent fasteners or housing walls restrict tool clearance.
Heavy hex
Use on flange-bolting sets and pressure-equipment joints calling for a heavy-hex pattern. The wider bearing footprint and larger wrench size require more seat area and socket clearance than a regular hex nut.
Thin hex
Use in restricted axial spaces or as part of a specified two-nut locking arrangement. Reduced thread engagement means a thin nut is not a direct load-capacity replacement for a full-height nut.
- Metric thread
- M4–M100
- Inch thread
- 1/4″–4″
- Patterns
- Heavy hex
- Thread systems
- Metric · UNC · UNF · 8UN · UNJ
- Final condition
- Annealed
- Inspection
- Thread plug gauges · Across flats · Nut height
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 ordered annealed or solution-treated state is retained in the lot record; forming and machining do not replace the specified thermal condition.
Finished geometry
Internal thread gauging, usable engagement and bearing-face alignment are checked after final processing.
Where Nimonic 75 fits — and what matters
Radiant tubes & circulation fans
Nimonic 75 Heavy Hex NutsNimonic 75 heavy hex nuts can secure moderately loaded radiant-tube support brackets and stationary furnace-fan accessories. Their alloy resists oxidation, while the broad seating face fits substantial mounting plates. Large flats are useful where shutdown tooling has room to engage them.
Connection requirements
- Mating stud diameter, thread form, and thread class
- Nut height, width across flats, and bearing-face condition required
- Temperature range, vibration duty, and heat-number certification
Burner mounts & nozzles
Nimonic 75 Heavy Hex NutsAt accessible burner support studs, a heavy hex Nimonic 75 nut provides a broad seating face and substantial tool engagement. The alloy suits moderate-load hardware exposed to hot oxidizing conditions. This is useful where a robust nut shape is wanted even though the connection does not require a high-strength alloy.
Connection requirements
- Mating stud diameter, thread form, and thread class
- Nut height, width across flats, and bearing-face condition required
- Temperature range, cycling duty, and heat-number certification
Retort & muffle covers
Nimonic 75 Heavy Hex NutsRetort accessory covers can use Nimonic 75 heavy hex nuts where their larger footprint fits the spotfaces. They provide an oxidation-resistant internally threaded component with easy wrench access. Their role is in moderate-load hot hardware, with the cover design setting the necessary nut capacity.
Connection requirements
- Mating stud diameter, thread form, and thread class
- Nut height, width across flats, and bearing-face condition required
- Temperature range, cycling duty, and heat-number certification
Same heavy hex nut. Different material priorities.
Nimonic 75 material dataInconel 601 Heavy Hex Nuts
Furnace covers and robust fixture studs expose the nut directly to the hot atmosphere. Inconel 601 heavy hex nuts bring oxidation resistance to those threads and seating faces. Broad flats and a substantial bearing pattern suit support plates and cover spotfaces opened during furnace maintenance.
Inconel 600 Heavy Hex Nuts
Inconel 600 heavy hex nuts suit robust retort, shield-support and hot-cover assemblies. Oxidation resistance helps the exposed nut withstand the atmosphere, while broad bearing contact suits substantial spotfaces and plates. The larger flats provide useful engagement for maintenance tooling.
Nimonic 80A Heavy Hex Nuts
Nimonic 80A heavy hex nuts combine age-hardened hot strength with broad seating faces for substantial turbine, bonnet and exhaust stud assemblies. Their loaded internal threads carry the stud tension into the cover or support. Large wrenching flats suit connections with room for controlled assembly tooling.
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 N06075 · heat number · ordered condition
- Final-part acceptance
- Grade chemistry, supplied condition and ordered mechanical requirements.
- Dimensional record
- Thread plug gauges · Across flats · Nut height
- Traceability
- EN 10204 3.1 material certificate · production lot · identified packing
Build your Nimonic 75 heavy hex nut enquiry
Questions about Nimonic 75 hex nuts
Does a matching UNS make the stud and nut a matched set?
Matching chemistry addresses only one part of the order. Nut strength, effective engagement, internal thread fit and surface friction must also suit the stud and assembly tightening method.