Nickel Alloy Stud Bolts
| Standard | ASTM B637 / ASTM B446 / ASTM F468 ref |
|---|---|
| Material | Inconel 625 / Inconel 718 |
| Strength Grade | Alloy 625 / Alloy 718 (Aged) |
| Size Range | M5-M20 |
| Surface Treatment | Pickled / Passivated |
01
Product Description
Product Description & Key Specifications
Nickel alloy stud bolts are severe-service bolting components used where corrosion, high temperature, seawater exposure or alloy compatibility require Inconel 625 or Inconel 718 instead of carbon steel or stainless steel. They are supplied to ASTM B637 / ASTM B446 / ASTM F468 references in M5-M20 sizes.
Inconel 625 is selected for chloride, seawater, offshore and chemical corrosion resistance. Inconel 718, often in aged condition, is selected for higher strength and elevated-temperature service. Stud bolt procurement should confirm alloy, heat treatment condition, thread, length, nut pairing, washer pairing, PMI and certificate requirements.
Pickled and passivated finish supports nickel alloy surface cleanliness. These studs are used in marine equipment, offshore valves, high-temperature machinery, power generation auxiliaries and renewable energy systems where material traceability and corrosion resistance are high-conversion procurement concerns.
| Product type | Nickel alloy stud bolts / Inconel threaded studs |
|---|---|
| Standards | ASTM B637 / ASTM B446 / ASTM F468 reference |
| Material | Inconel 625 / Inconel 718 |
| Strength grade | Alloy 625 / Alloy 718 aged condition as specified |
| Size range | M5-M20 |
| Common models | M5, M6, M8, M10, M12, M16, M20 with drawing-based length |
| Thread type | Metric thread, full thread or double-end by drawing |
| Surface finish | Pickled / Passivated |
| Matched hardware | Nickel alloy hex nuts and nickel alloy flat washers |
| Documentation | MTC, PMI, CoC, dimensional report and heat treatment report on request |
02
Selection
Selection Advantages by Application
Marine and Offshore Bolting
Inconel 625 studs are used for seawater-exposed assemblies, offshore equipment and marine hardware where chloride corrosion resistance is required.
Marine fastenersOil, Gas and Process Equipment
Nickel alloy studs support valves, flanges, instrumentation and process equipment where severe corrosion or project material compatibility requires Inconel bolting.
Oil and gas fastenersPower and Renewable Energy Systems
Inconel 718 studs can be specified for high-temperature and high-strength auxiliary equipment, while Alloy 625 supports corrosive renewable energy environments.
Power generation fasteners03
Assembly
Recommended Matching Products
04
Manufacturing
Manufacturing & Quality Control
Manufacturing CapabilityQuality Control
Cutting, machining and thread rolling or cutting from nickel alloy barInconel 625 / 718 material certificate and heat number verification
Full-thread or double-end stud geometry by drawingThread gauge, overall length and end chamfer inspection
Pickling and passivation for nickel alloy surface conditionSurface inspection, PMI and passivation report support when specified
Aged Alloy 718 condition support when specifiedHeat treatment and mechanical property documentation review
Studs supplied loose or kitted with nuts and washersMTC, PMI, CoC and dimensional reports prepared on request
05
FAQ
Common Questions Before RFQ
When should nickel alloy stud bolts be used?
Use them for severe corrosion, seawater, chemical or high-temperature applications where carbon steel or stainless stud bolts are not sufficient.
What is the difference between Inconel 625 and 718 studs?
Inconel 625 is commonly chosen for corrosion resistance. Inconel 718 is chosen for higher strength and elevated-temperature service when specified.
Can PMI be supplied?
Yes. PMI, material certificates, heat traceability and dimensional reports can be supplied when requested.
Can studs be supplied with nuts and washers?
Yes. Nickel alloy studs can be supplied with matching Inconel hex nuts and flat washers.
What RFQ details are needed?
Send alloy, size, length, thread type, finish, quantity, matching nut/washer requirement and certificate scope.
Need Inconel stud bolts for severe service?
Send alloy, size, length, thread, finish, quantity, PMI/MTC requirements and matching nut/washer needs. We can quote Inconel 625 / 718 stud bolts for offshore, marine and high-temperature equipment.
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