Hastelloy Fasteners Supplier in India – C276, C22 & B2 Bolts, Nuts & Studs
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A single corroded bolt can shut down a flange, leak acid onto a plant floor and cost far more than the fastener ever did. That is why engineers working with hot acids, chlorides and sour gas specify Hastelloy fasteners instead of stainless steel. At Aashish Metals, we supply Hastelloy C276, C22 and B2 bolts, studs, nuts, washers, screws and threaded rod to chemical plants, refineries, pharma units and EPC contractors in India and abroad. Each fastener is made from a certified bar with a heat-traceable EN 10204 3.1 mill test certificate, and we can cut, thread, finish and pack to your drawing, with the paperwork your inspector expects, from a handful of pieces for a pilot line to a full project package. This page explains grades, standards, sizes, strength, galling, price drivers and applications in plain language, so you can specify the right fastener the first time and send us an enquiry that turns into an accurate quote.
What are Hastelloy fasteners?
Hastelloy fasteners are bolts, studs, nuts, screws, washers and threaded rods machined or formed from Hastelloy nickel-molybdenum-chromium alloys such as C276 (UNS N10276), C22 (UNS N06022) and B2 (UNS N10665). They resist severe corrosion from acids, chlorides and oxidising media where stainless steel fasteners would pit, crack or dissolve.
Technical data
Hastelloy Fasteners Product We Supply
Buyers search for these parts under many names. Hastelloy bolts, hastelloy screws, hastelloy c bolts and c276 fasteners often mean the same family, and our range covers all of them.
| Product | Typical forms and standards | Common use |
|---|---|---|
| Hex bolts and heavy hex bolts | Including hastelloy c276 hex bolts; ASME B18.2.1, ISO 4014/4017, DIN 931/933 | Flange joints, pump and valve casings |
| Stud bolts | Full-thread and double-ended; UNC 8UN, metric, custom lengths | Pressure flanges, reactor closures |
| Threaded rod (hastelloy threaded rod) | DIN 975 style, metric and UNC; 1–3 m lengths [confirm] | Tie rods, supports, cut-to-length studs |
| Nuts | Hex, heavy hex, dome or cap, lock, coupling and wing nuts | Matched to bolts and studs |
| Washers | Flat, spring, lock, square and tab washers | Load spreading, locking |
| Socket head cap screws and machine screws | ISO 4762 / ASME B18.3, pan, cheese, countersunk | Instruments, compact assemblies |
| Set screws, eye bolts, U-bolts, J-bolts, foundation bolts | Standard and custom per drawing | Pipe supports, anchoring, lifting points |
| Custom fasteners | Made to drawing or sample, including special heads and threads | OEM and repair jobs |
Looking for one grade? See our dedicated pages for Hastelloy C276 fasteners and Hastelloy C22 fasteners, or browse the full Hastelloy products range.
Hastelloy Fasteners Equivalent Grades
| Grade | UNS | Werkstoff Nr. | EN designation | JIS |
|---|---|---|---|---|
| Hastelloy C276 | N10276 | 2.4819 | NiMo16Cr15W | NW 0276 |
| Hastelloy C22 | N06022 | 2.4602 | NiCr21Mo14W | NW 6022 |
| Hastelloy B2 | N10665 | 2.4617 | NiMo28 | – |
| Hastelloy B3 | N10675 | 2.4600 | NiMo29Cr | – |
Engineer’s quick rule: Mixed or unknown media: C276. Oxidising and chloride-rich: C22. Pure HCl: B2 or B3. If your flange and pipe are already in a specific grade, match the bolting to it unless a designer says otherwise. Send us concentration, temperature and pressure and we will help narrow the choice.
Chemical Composition and Mechanical Properties
| Element (%) | C276 | C22 | B2 |
|---|---|---|---|
| Nickel | Balance | Balance | Balance |
| Chromium | 14.5 – 16.5 | 20.0 – 22.5 | 1.0 max |
| Molybdenum | 15.0 – 17.0 | 12.5 – 14.5 | 26.0 – 30.0 |
| Iron | 4.0 – 7.0 | 2.0 – 6.0 | 2.0 max |
| Tungsten | 3.0 – 4.5 | 2.5 – 3.5 | – |
| Cobalt | 2.5 max | 2.5 max | 1.0 max |
| Manganese | 1.0 max | 0.50 max | 1.0 max |
| Carbon | 0.010 max | 0.015 max | 0.02 max |
| Silicon | 0.08 max | 0.08 max | 0.10 max |
Typical mechanical properties (annealed bar)
| Typical property (annealed bar) | C276 | C22 | B2 |
|---|---|---|---|
| Density | 8.89 g/cm³ | 8.69 g/cm³ | 9.22 g/cm³ |
| Tensile strength (min.) | 690 MPa (100 ksi) | 690 MPa (100 ksi) | 760 MPa (110 ksi) |
| Yield, 0.2% (min.) | 283 MPa (41 ksi) | 310 MPa (45 ksi) | 350 MPa (51 ksi) |
| Elongation (min.) | 40% | 45% | 40% |
Important note on strength: Annealed Hastelloy is corrosion-resistant but is not as strong as a B7 alloy-steel stud. Cold-worked (strain-hardened) bar can give higher yield strength, and values are printed on the MTC. Do not swap bolting for a different grade or condition without a design check, and always calculate bolt loads from the certified strength, not from the datasheet.
Hastelloy Fasteners Specification and Size Tables
| Parameter | Details |
|---|---|
| Grades | Hastelloy C276, C22, B2 (B3, C-4, C-2000, X on request) |
| Raw material standards | Bar to ASTM B574 (C276, C22) and ASTM B335 (B2, B3); forgings to ASTM B564 where applicable |
| Dimensional standards | ASME B18.2.1 / B18.2.2 (inch hex bolts and nuts), ISO 4014 / 4017 / 4032, DIN 931 / 933 / 934 / 975 / 912, ASME B18.3, ASME B18.22.1 (washers), or to your drawing |
| Thread standards | Metric coarse and fine (ISO 262 / 965), UNC, UNF, 8UN, BSW, BSF; tolerance classes 6g/6H or 2A/2B |
| Size range | M6 to M64 and 1/4" to 2-1/2" typical; larger on request [confirm] |
| Length | Bolts to your length; threaded rod and studs in 1–3 metre lengths [confirm] |
| Surface finish | Plain, pickled, polished, PTFE or Xylan coated on request |
| Manufacturing | Machined from bar, hot-forged and machined, or thread-rolled |
| Certificates | EN 10204 3.1 MTC; 3.2 with third-party inspection on request |
| Packing | Individually bagged or boxed, palletised, export wooden cases |
Metric hex bolt dimensions (ISO 4017 style, coarse pitch)
| Size | Pitch (mm) | Width across flats (mm) | Head height (mm) |
|---|---|---|---|
| M8 | 1.25 | 13 | 5.3 |
| M10 | 1.5 | 16 | 6.4 |
| M12 | 1.75 | 18 | 7.5 |
| M16 | 2.0 | 24 | 10.0 |
| M20 | 2.5 | 30 | 12.5 |
| M24 | 3.0 | 36 | 15.0 |
| M30 | 3.5 | 46 | 18.7 |
| M36 | 4.0 | 55 | 22.5 |
Inch hex bolt sizes (UNC / UNF, ASME B18.2.1)
| Size | UNC (threads per inch) | UNF (threads per inch) | Width across flats |
|---|---|---|---|
| 3/8" | 16 | 24 | 9/16" |
| 1/2" | 13 | 20 | 3/4" |
| 5/8" | 11 | 18 | 15/16" |
| 3/4" | 10 | 16 | 1-1/8" |
| 7/8" | 9 | 14 | 1-5/16" |
| 1" | 8 | 12 | 1-1/2" |
Threaded rod weight per metre (approximate, nominal diameter)
| Rod size | C276 (kg/m) | C22 (kg/m) | B2 (kg/m) |
|---|---|---|---|
| M8 | 0.45 | 0.44 | 0.46 |
| M10 | 0.70 | 0.68 | 0.72 |
| M12 | 1.01 | 0.98 | 1.04 |
| M16 | 1.79 | 1.75 | 1.85 |
| M20 | 2.79 | 2.73 | 2.90 |
| M24 | 4.02 | 3.93 | 4.17 |
| M30 | 6.28 | 6.14 | 6.52 |
| M36 | 9.05 | 8.85 | 9.39 |
Weight = diameter² × 0.006982 for C276 (0.006825 for C22, 0.007242 for B2), diameter in mm and result in kg per metre. Real weight is slightly lower because of the thread. Multiply by length and your quoted price per kg for a quick material estimate.
Hastelloy vs Other Alloy Fasteners
| Fastener material | Strong at | Weak at | Relative cost |
|---|---|---|---|
| Hastelloy C276 / C22 / B2 | Chlorides, mixed acids, HCl (B2), oxidising media (C22) | Highest cost; lower annealed strength than B7 | $$$$ |
| Inconel 625 / 718 | Seawater, chlorides, high strength and temperature (718) | Hot reducing acids such as HCl | $$$ |
| Monel 400 / K500 | Hydrofluoric acid, seawater, alkalis; K500 is high strength | Oxidising acids | $$$ |
| Incoloy 825 | Sulphuric and phosphoric acid, moderate chloride | Severe chlorides | $$ |
| Alloy 20 | Sulphuric acid service | Chloride pitting | $$ |
| Super duplex | Chloride SCC resistance, high strength | Hot HCl, high temperatures above about 300 °C | $$ |
| SMO 254 | Seawater, chloride pitting | Strong reducing acids | $$ |
| 904L | Sulphuric acid, moderate chlorides | Hot chlorides, strong HCl | $$ |
| 316 / 316L | General service, mild chemicals | Chlorides, HCl, wet chlorine | $ |
| Titanium Gr 5 | Seawater, oxidising chlorides, low weight | Reducing acids, dry chlorine | $$$ |
If 316 will do, we will say so. Our 316/316L hex bolts, stud bolts, nuts and washers are there for less demanding lines. Not sure? Use our materials guide or ask an engineer.
Hastelloy Fasteners Applications
| Industry | Where Hastelloy fasteners are used | Preferred grade |
|---|---|---|
| Chemical & petrochemical | Flange bolting on acid lines, reactor closures, agitators, pump casings | C276, C22 |
| Pollution control | FGD scrubbers, ducting, quencher hardware | C276, C22 |
| Oil & gas | Sour-service valves, manifolds, subsea and offshore hardware | C276 |
| Pharma & fine chemicals | Halide-bearing streams, glass-lined and clad vessels | C22, C276 |
| Pulp & paper | Bleach plants, chlorine dioxide equipment | C276 |
| Marine & desalination | Seawater exchangers, brine systems | C276, C22 |
| Hydrochloric acid handling | Pure HCl pumps, tanks and lines | B2, B3 |
| Power & waste-to-energy | Condensers, scrubbers, waste-heat systems | C276 |
Quality Assurance and Manufacturing Process
| Step | What happens |
|---|---|
| 1. Requirement review | We confirm grade, size, thread, standard, quantity and certificates |
| 2. Bar sourcing | Certified bar from approved mills, with heat number and MTC |
| 3. PMI check | XRF positive material identification before cutting |
| 4. Forming | Machining, hot forging or thread rolling to size |
| 5. Threading and finishing | Cut or rolled threads, deburring, pickling or polishing, optional coating |
| 6. Inspection | Dimensions, thread gauging, visual and marking checks |
| 7. Packing and dispatch | Bagged, boxed, palletised and shipped with documents |
Tests available on request
- Chemical analysis and PMI
- Tensile, yield, elongation and hardness
- Intergranular corrosion (IGC) testing to ASTM G28 where specified
- Thread gauge inspection and dimensional reports
- Third-party inspection by an agency of your choice
- Heat-lot traceability with marking
Standards and Certifications
| Standard / certificate | What it covers |
|---|---|
| ASTM B574 / ASME SB574 | Low-carbon nickel-molybdenum-chromium alloy rod and bar (C276, C22) |
| ASTM B335 / ASME SB335 | Nickel-molybdenum alloy rod and bar (B2, B3) |
| ASTM B564 / ASME SB564 | Nickel alloy forgings |
| ASME B18.2.1 / B18.2.2 / B18.3 | Hex bolts, nuts and socket screws (inch) |
| ISO 4014 / 4017 / 4032, DIN 931 / 933 / 934 / 975 | Metric hex bolts, nuts and threaded rod |
| ASME B1.1 / ISO 262 | Unified and metric thread forms |
| NACE MR0175 / ISO 15156 | Materials for sour service; conformity as stated in the standard |
| EN 10204 3.1 / 3.2 | Mill test certificate; 3.2 with independent inspection |
| ISO 9001 [confirm details] | Quality management |
A note on standards: ASTM A193 and A194 cover steel bolting and nuts, not Hastelloy, so a Hastelloy fastener is specified by its bar standard plus a dimensional standard. Hastelloy® is a registered trademark of Haynes International, Inc.
Hastelloy Bolts Price: What Drives It
People often search for hastelloy bolts price hoping for a number. The honest answer is that nickel and molybdenum markets move, and a bolt is priced by material weight plus machining, so a static list would be out of date quickly. Here is what shapes your quote:
| Price factor | Why it matters |
|---|---|
| Grade | C276, C22, B2 and B3 have different nickel and molybdenum content |
| Size and length | Heavier fasteners use more bar stock |
| Type | Threaded rod is cheaper per kg than machined hex bolts or custom heads |
| Forming method | Rolled threads and forged heads cost differently to fully machined parts |
| Quantity | Larger lots spread setup and bar-cutting cost |
| Coating or finish | Xylan, PTFE, polishing or pickling add cost |
| Certification | 3.2 and extra testing add cost |
| Destination and packing | Export packing, freight and Incoterms |
To get a fast, accurate price, send us the grade, standard, size, thread, length, quantity, certificate level and delivery location, or attach a drawing.
Ordering, Packing and Delivery
| Topic | Details [confirm all before publishing] |
|---|---|
| Minimum order | Trial and small lots supported; contact us for details |
| Lead time | Stock sizes: quick dispatch; made-to-order: quoted per job |
| Packing | Bagged or boxed, palletised, export wooden cases with marking |
| Port of dispatch | Mumbai / Nhava Sheva |
| Payment | LC, TT and other agreed terms |
| Documents | Commercial invoice, packing list, MTC, certificate of origin, inspection reports on request |
| Export | We ship to customers across India and worldwide |
Hastelloy Fasteners Grades and How to Choose
Hastelloy C276 fasteners and bolts (UNS N10276)
C276 is the workhorse. With about 15–17% molybdenum and 3–4.5% tungsten, it handles both oxidising and reducing chemicals, including wet chlorine, hypochlorite and hot acid mixtures. If you are unsure, hastelloy c276 fasteners are the safe starting point. On drawings you may also see them written as c276 fasteners, c276 bolts or hastelloy c276 bolts.
Hastelloy C22 fasteners (UNS N06022)
C22 carries more chromium (20–22.5%), which helps in strongly oxidising acids and hot chloride solutions. Hastelloy c22 fasteners are popular in FGD scrubbers, pharma and pesticide plants where chemistry swings between oxidising and reducing.
Hastelloy B2 fasteners (UNS N10665)
B2 is the specialist for hydrochloric acid without oxidisers. Hastelloy b2 fasteners perform well in pure HCl, but any ferric or cupric salts turn them into a poor choice, and B2 should not be held in the 540–815 °C range because it loses ductility. If that thermal risk matters, ask us about B3 (UNS N10675), which is more stable.
Other grades on request
| Property / use | C276 | C22 | B2 | B3 |
|---|---|---|---|---|
| UNS | N10276 | N06022 | N10665 | N10675 |
| Werkstoff (W.Nr.) | 2.4819 | 2.4602 | 2.4617 | 2.4600 |
| Best for | Mixed or unknown chemistry, chlorides, FGD | Oxidising acids, chloride pitting, pharma | Pure hydrochloric acid (reducing) | HCl with better thermal stability than B2 |
| Avoid when | Strong hot oxidising acids (look at C22) | Purely reducing HCl (look at B2/B3) | Oxidisers present; long exposure at 540–815 °C | Oxidising media |
| Bar standard | ASTM B574 | ASTM B574 | ASTM B335 | ASTM B335 |
Selection and Installation Guidance
Match the fastener to the joint
Bolting is only as good as the joint around it. For Hastelloy lines, pair fasteners with matching Hastelloy pipes and tubes, pipe fittings, threaded fittings, socket weld fittings and flanges. Instrument lines often need tube fittings, needle valves, ball valves and manifold valves bolted or mounted with the same alloy hardware.
Avoid galling
Nickel alloys are prone to galling, where the thread surfaces weld together as the nut turns. It is the most common site problem we hear about. To reduce it:
- Use a nickel-based or other anti-seize compound that is free of sulphur, lead and chlorides.
- Prefer rolled threads and clean, undamaged threads.
- Run the nut on slowly and avoid impact wrenches.
- Consider Xylan coated or PTFE coated fasteners, keeping in mind their temperature limits.
- Validate the torque with the lubricant you actually use, because friction changes preload.
Nuts and washers
Use nuts and washers in the same alloy as the bolt or stud so the whole joint corrodes at the same (very low) rate. For flange joints, hardened washers under the nut help spread load and protect the surface.
Do not mix with carbon steel in wet service
Hastelloy is noble in most solutions. Pairing it with carbon steel or low-alloy hardware in a wet joint can drive corrosion of the less noble part. Keep the wetted fasteners in Hastelloy.
Why Buy from Aashish Metals
- One supplier for the whole joint. Fasteners, Hastelloy pipes and tubes, fittings, flanges and round bars in matching alloys.
- Bar stock we can trace. Heat numbers and MTCs travel with the parts.
- Straight technical advice. We flag galling, strength and grade-choice issues before you order, not after.
- Wide alloy range. Compare Hastelloy with Inconel 600, nickel alloy 200/201 and others through one contact.
- Custom work. We make to drawing, sample or standard.
Read more about Aashish Metals, browse the technical blog, or contact our team. Machined components are available from C22 round bars, B2 round bars and C276 plates and sheets. You may also want to see our DIN fasteners and nickel alloy products.
Hastelloy Fasteners Price
The price of Hastelloy fasteners depends on the grade, size, fastener type, quantity, thread specification and required standards. Grades such as Hastelloy C276, C22 and B2 may have different pricing based on material availability and manufacturing requirements. For the latest Hastelloy fasteners price, contact us with your required specifications and quantity to receive a competitive quotation.
FAQs - Hastelloy Fasteners
They are used where ordinary bolting corrodes: acid and chloride flange joints, FGD scrubbers, reactors, pumps, valves, pulp bleaching, pharma vessels and seawater equipment. The nickel-molybdenum-chromium alloy keeps its integrity where 316 or 904L would pit or crack.
C276 has more molybdenum and copes with a wide mix of oxidising and reducing chemicals. C22 has more chromium and is better in strongly oxidising acids and hot chloride solutions. When the process chemistry is uncertain, C276 is the usual first choice.
Yes, B2 is designed for pure hydrochloric acid without oxidisers. It is not suitable when ferric or cupric ions are present, and it should not be kept in the 540–815 °C range. B3 offers better thermal stability if that is a concern.
Hastelloy bolts are machined from bar made to ASTM B574 (C276, C22) or ASTM B335 (B2, B3), and dimensions follow ASME B18 or ISO and DIN standards. ASTM A193 and A194 apply to steel bolting and nuts, not to Hastelloy.
In the annealed condition they are lower in strength than B7 studs, though comparable to or above many 316 fasteners. Cold-worked bar can be stronger. Check the yield on the MTC and design the joint from certified values rather than assuming.
Need Hastelloy bolts, studs or nuts that last?
Send us your grade, size, thread and quantity, or attach a drawing. We will reply with a clear quote and the right certificates, and an engineer can help you choose the grade.
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