Incoloy 825 Stud Bolts
ASME B18.31.2ASTM B425
Incoloy 825 stud bolts serve acid-process flanges and removable equipment covers exposed to corrosive liquid or condensate. Full-thread and double-end forms accommodate through-flanges or tapped housings, with length and end engagement matched to the actual connection.
- 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
AnnealedThe specified anneal restores ductility and the corrosion-resistant supplied condition after hot or cold working.
What we can make in Alloy 825
Fully threaded
Two nuts clamp the flange or cover; usable thread length spans the assembled grip.
Double-end
A plain centre spans the grip, with a threaded portion at each end for the nuts.
Tap-end
One end engages a tapped casing; the exposed end accepts the cover nut.
- Threads
- Metric · UNC · UNF · 8UN · UNJ
- Forms
- Continuous thread · Double-end · Tap-end
- Final condition
- Annealed
- Inspection
- Thread size and fit; overall and effective thread length; end geometry; lot identification.
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 825 fits — and what matters
Reactor vessel & manway flanges
Incoloy 825 Stud Bolts825 studs suit reactor manways where compatible acid residue reaches the exposed threads. A through-flange uses nuts at both ends; a tapped-body arrangement can leave the vessel-side end installed while the cover is removed. That distinction sets the stud length and engagement needed for repeated manway servicing.
Connection requirements
- Manway flange or tapped-hole arrangement
- Acid concentration at the joint
- Stud length basis and end engagement
Acid heat exchangers & condensers
Incoloy 825 Stud BoltsOn an acid-exchanger channel head, 825 studs provide corrosion-resistant fastening points near gasket-edge leaks and cleaning residues. They are candidates for compatible sulfuric- or phosphoric-acid duty, with stud strength specified for the cover load. The assembled cover, gasket, washers and nuts determine the required length.
Connection requirements
- Channel-cover stack and gasket
- Nut and washer heights
- Operating and cleaning solutions
Packing gland followers & eyebolts
Incoloy 825 Stud BoltsPacking gland followers use paired studs to draw the follower down evenly as packing is adjusted. Incoloy 825 studs are useful when acid leakage reaches this exposed hardware. The usable thread length needs to cover the follower’s adjustment travel, while both stud ends must fit the pump or valve body.
Connection requirements
- Follower travel and spacing
- Body thread size and engagement
- Packing leakage chemistry
Same stud. Different material priorities.
Incoloy 825 material dataHastelloy C-276 Stud Bolts
Hastelloy C-276 studs suit repeatedly opened reactor, scrubber and acid-exchanger covers exposed to corrosive deposits or process leakage. The alloy protects the loaded stud surfaces in compatible mixed chemical media. Removable nuts provide access while body-mounted studs can remain installed.
Inconel 625 Stud Bolts
Offshore flanges and marine valve bonnets put the stud threads, nut seats and exposed shank in different pockets of chloride exposure. Inconel 625 studs bring pitting and crevice-corrosion resistance to that loaded connection. On tapped-stud bonnets, crews can remove the nuts and cover while leaving the studs installed in the valve body.
254 SMO Stud Bolts
254 SMO studs retain seawater-pump and bleach-plant covers exposed to chloride-bearing residues. The six-moly austenitic alloy offers improved localized-corrosion resistance over 316. Removable nuts permit servicing, while defined housing engagement and nut-end projection suit double-end cover studs.
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 N08825 · heat number · ordered condition
- Final-part acceptance
- Grade chemistry, supplied condition and ordered mechanical requirements.
- Dimensional record
- Thread size and fit; overall and effective thread length; end geometry; lot identification.
- Traceability
- EN 10204 3.1 material certificate · production lot · identified packing
Matching Kit
Flange Stud Bolt Kits
Build your 825 stud enquiry
Questions about 825 stud bolts & threaded rods
Does changing the stud alloy also change the nut selection?
The nut needs compatible internal threads, sufficient engaged height and a specified material condition. Select lubricant or surface treatment with the stud–nut pair, because assembly friction affects the preload obtained from tightening.