Inconel 601 Heavy Hex Nuts
ASME B18.2.2ASTM B166
Inconel 601 heavy hex nuts pair a solid-solution nickel-chromium alloy with a larger bearing face for high-load furnace bolt systems. Paired with matching 601 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 Alloy 601
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 601 fits — and what matters
Retort & muffle covers
Inconel 601 Heavy Hex NutsRetort-cover studs need nuts that tolerate the same oxidizing atmosphere as the exposed fasteners. Inconel 601 heavy hex nuts provide substantial flats for cover maintenance and a broad bearing face. The alloy addresses oxidation of the nut; the assembly specification establishes the necessary load 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
Heat shields & furnace linings
Inconel 601 Heavy Hex Nuts601 heavy hex nuts suit robust lining-retainer and shield-support studs near an oxidizing furnace hot face. The larger seating area is useful on substantial support plates, and the exposed nut shares the stud's atmosphere-resistant material. Shield movement is provided in the retaining arrangement.
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
Carburizing & stack fixtures
Inconel 601 Heavy Hex NutsOn furnace stack and tray fixtures, a heavy hex nut gives robust wrenching flats for repeated setup and repair. Inconel 601 adds resistance to oxidation and carburizing furnace exposure. It suits fixture positions with enough clearance for the heavy pattern, particularly where thin or small nuts would be awkward to handle.
Connection requirements
- Mating bolt diameter, thread form, and thread class
- Nut height, width across flats, and bearing-face condition required
- Carburizing exposure, temperature range, and heat-number certification
Same heavy hex nut. Different material priorities.
Inconel 601 material dataInconel 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.
Incoloy 800H Heavy Hex Nuts
Incoloy 800H heavy hex nuts carry sustained loads on hot flange studs and boiler hangers. The creep-focused material condition supports long operating runs, while the heavy pattern provides broad seating contact. Specify the nut condition and load requirements with the mating rod or stud.
Nimonic 75 Heavy Hex Nuts
Nimonic 75 heavy hex nuts pair oxidation resistance with broad bearing faces for moderately loaded furnace supports and retort accessories. Large flats suit substantial maintenance tooling. The heavy pattern is useful where the support plate has sufficient bearing area and socket clearance.
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 N06601 · 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 601 heavy hex nut enquiry
Questions about 601 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.