Hastelloy C-276 Stud, nut & washer sets
ASME B18.31.2ASTM B574
Hastelloy C-276 stud, nut and washer sets carry the connection from tensile member to bearing surface. Resistance to chemically aggressive, mixed process streams must be matched by suitable nut engagement and washer bearing strength.
- 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
Finished-Component Specifications
Threads · Metric
Threads · Inch
Dimension Reference
Heat Treatment
Solution annealedSolution annealing dissolves detrimental precipitates, followed by rapid cooling to preserve corrosion resistance.
What we can make in Hastelloy C-276
Stud
Include both washers when calculating the clamped stack and usable stud projection. Their thickness can change the stud length needed to engage both nuts.
Nuts
Pair the nut grade, proof load and thread fit with the stud for the intended clamp load. Heavy-hex nuts also need enough radial clearance for the installation socket.
Washers
Use washers to provide the specified bearing footprint or replaceable seating surface. Bore clearance must accommodate the stud, while thickness must support the opening beneath the washer.
- Grade pairing
- Stud + two nuts + washers
- Grade pairing
- Metric · UNC · UNF · 8UN · UNJ
- Grade pairing
- Component-by-component grades
- Grade pairing
- Heat and batch identification
- Final condition
- Solution annealed
- Inspection
- Component count · Mating thread fit · Individual dimensions
Manufacturing route
Studs, nuts and washers are manufactured and inspected as separate components before the specified quantities are packed as a set.
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
Thread engagement, nut pattern and component grades are checked together. Each component retains its heat or batch identity in the set documentation.
Where C-276 fits — and what matters
Chemical Processing
Chemical pump covers and reactor connectionsHastelloy C-276 stud, nut & washer sets bring the studs, mating nuts and specified bearing washers together for chemical pump covers and reactor connections. The washer stack is included in the required usable stud length. Process liquid can remain at the contact after the exposed surface drains.
Pumps, Valves & OEM
Pump casings and valve bonnetsHastelloy C-276 stud, nut & washer sets bring the studs, mating nuts and specified bearing washers together for pump casings and valve bonnets. The washer stack is included in the required usable stud length. Repeated maintenance makes fit, engagement and access part of the component specification.
Mining & Mineral Processing
Chemical-recovery pump and vessel coversHastelloy C-276 stud, nut & washer sets bring the studs, mating nuts and specified bearing washers together for chemical-recovery pump and vessel covers. The washer stack is included in the required usable stud length. Leach solution and deposits act on the installed part; corrosion duty is separate from abrasive wear.
Same stud, nut & washer set. Different material priorities.
Hastelloy C-276 material dataInconel 625
Solid-solution strength and resistance to aggressive process liquids.
- Connection priority
- Stud tension, nut engagement and washer bearing
- 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 stud–nut threads and both washer-bearing interfaces in the exposure description.
Hastelloy C-22
Corrosion resistance across oxidising and reducing process exposures.
- Connection priority
- Stud tension, nut engagement and washer bearing
- 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 stud–nut threads and both washer-bearing interfaces in the exposure description.
Titanium Grade 2
Low mass, corrosion resistance and commercially pure titanium formability.
- Connection priority
- Stud tension, nut engagement and washer bearing
- Commercially pure titanium
- Grade 2 favours corrosion resistance and forming characteristics over the higher strength of Grade 5. Mating-metal contact, surface condition and assembly friction remain part of the connection design. Include liquid retained at the stud–nut threads and both washer-bearing interfaces 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 N10276 · heat number · ordered condition
- Final-part acceptance
- Grade chemistry, supplied condition and ordered mechanical requirements.
- Dimensional record
- Component count · Mating thread fit · Individual dimensions
- Traceability
- EN 10204 3.1 material certificate · production lot · identified packing
Build your C-276 stud, nut & washer set enquiry
Questions about C-276 stud, nut & washer sets
Can all components be accepted from the stud certificate?
Each component has its own job and material lot. The nut needs thread and strength acceptance, and the washer needs bearing geometry and the ordered condition; retain those records with the stud’s documentation.