Hastelloy B-3 Double-end studs
ASME B18.31.2ASTM B335
B-3 double-end studs address reducing-acid exposure at chemical pump and valve covers. The tapped body end can retain contaminated liquid, making oxidising impurities a material-selection issue even after the exposed nut end drains.
- 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 dissolves detrimental precipitates, followed by rapid cooling to preserve corrosion resistance.
What we can make in Hastelloy B-3
Clamping stud
Use for through-bolted covers and housings with access to both nuts. The plain grip spans the joint; independently sized threaded ends accommodate unequal nut-side clearances.
Tap-end stud
Use on valve bonnets and machine housings opened repeatedly for maintenance. The insertion end remains in the body while the outer nut is removed, reducing repeated wear of the housing thread.
- Thread systems
- Metric · UNC · UNF · 8UN · UNJ
- Geometry
- Two threaded ends · Plain shank
- Assembly
- Nut-to-nut · Tap-end
- Final condition
- Solution annealed
- Inspection
- End thread lengths · Shank diameter · Thread gauging
Manufacturing route
CNC machining suits samples and special end forms. Repeat lots use cut-to-length stock with rolling or cutting selected for the ordered thread and material condition.
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
End lengths, runout and effective thread engagement are checked separately from overall length; tap ends are gauged to their own fit requirement.
Where B-3 fits — and what matters
Chemical Processing
Chemical pump covers and reactor connectionsHastelloy B-3 double-end studs connect chemical pump covers and reactor connections through a threaded body end and an accessible nut end. The plain shank spans the cover grip. Process liquid can remain at the contact after the exposed surface drains.
Pumps, Valves & OEM
Pump casings and valve bonnetsHastelloy B-3 double-end studs connect pump casings and valve bonnets through a threaded body end and an accessible nut end. The plain shank spans the cover grip. Repeated maintenance makes fit, engagement and access part of the component specification.
Mining & Mineral Processing
Chemical-recovery pump and vessel coversHastelloy B-3 double-end studs connect chemical-recovery pump and vessel covers through a threaded body end and an accessible nut end. The plain shank spans the cover grip. Leach solution and deposits act on the installed part; corrosion duty is separate from abrasive wear.
Same double-end stud. Different material priorities.
Hastelloy B-3 material dataHastelloy C-276
Resistance to chemically aggressive, mixed process streams.
- Connection priority
- Tension through the grip and load transfer into the housing
- 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 body-end thread inside the tapped housing in the exposure description.
Inconel 625
Solid-solution strength and resistance to aggressive process liquids.
- Connection priority
- Tension through the grip and load transfer into the housing
- 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 body-end thread inside the tapped housing in the exposure description.
Hastelloy C-22
Corrosion resistance across oxidising and reducing process exposures.
- Connection priority
- Tension through the grip and load transfer into the housing
- 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 body-end thread inside the tapped housing 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 N10675 · heat number · ordered condition
- Final-part acceptance
- Grade chemistry, supplied condition and ordered mechanical requirements.
- Dimensional record
- End thread lengths · Shank diameter · Thread gauging
- Traceability
- EN 10204 3.1 material certificate · production lot · identified packing
Build your B-3 double-end stud enquiry
Questions about B-3 double-end studs
Can both ends use the same thread designation?
They can, but the body end may require a different fit or engagement from the nut end. Record each end separately, including a different pitch or interference requirement where the equipment drawing uses one.