Standards
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175 / ISO 15156-2
- NORSOK M-650 Qualified
- API 6A Certified
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
Incoloy 925 Fasteners (UNS N09925)
Bolts, nuts, washers, studs, screws hub — sour-service nickel-iron-chromium fasteners ASTM B805 / API 6A / NACE MR0175
Incoloy 925 fasteners (UNS N09925) is the master hub for the alloy's full fastener portfolio: bolts, nuts, washers, studs, screws, threaded rods, pins, keys and the related mill products that go into them. The 796-cs commercial-intent search query "nickel alloy fasteners" + 50-cs "incoloy fasteners" lands here as the top-level navigation hub for buyers who know they need an Incoloy 925 fastener but haven't yet picked the specific type. Aged Incoloy 925 (110 ksi YS / 165 ksi UTS / 35 HRC max) qualifies for sour H₂S service per NACE MR0175 Table A.10 with chemistry, mechanical-property and heat-treatment requirements all governed by ASTM B805. Every fastener type listed below is manufactured to first-principles spec (NOT search-replaced from any other alloy) and ships with EN 10204 3.1 manufacturer's MTC; 3.2 with TPI witness on request. NORSOK M-650 qualified for Norwegian Continental Shelf supply.
Need Incoloy 925 fasteners? Email info@torqbolt.com with fastener type, size schedule, quantity, applicable standards. WhatsApp +91-22-66157017.
Fastener Types, Pick the Right Page
| Category | Pages |
|---|---|
| Stud Bolting (API 6A wellhead bolting volume leader) | Stud bolts · Studs · Threaded rods |
| Hex Bolts | Hex bolts · Heavy hex bolts · Hex cap screws · Bolts hub |
| Nuts | Hex nuts · Heavy hex nuts |
| Washers | Flat / spring / Belleville / structural F436 washers |
| Specialty fasteners | Socket head cap screws · 12-point screws · Countersunk screws · Set screws · Push bolts · U-bolts |
| Pins & Keys (assembly retention) | Pins (dowel / cotter / clevis / spring / taper) · Keys (parallel / Woodruff / gib-head) |
| Mill products (input + welding) | Bars · Rods · Rings · Forgings · Wire (incl welding wire) |
| Pipe + plate + tube + sheet | Pipe · Plate · Tube · Sheet |
Common Mechanical Properties (All Fastener Types, Aged)
Per ASTM B805: Tensile 165 ksi (1140 MPa) min · 0.2% Yield 110 ksi (760 MPa) min · Elongation in 4D 18% min · Reduction of Area 25% min · Hardness 32–35 HRC (NACE sour-service cap) · Charpy V-notch at -46°C: 40 J min (sour service) · Charpy at -101°C: 27 J min (API 6A PSL-3G cryogenic). See full mechanical properties page.
Why Choose Incoloy 925 for Sour-Service Fasteners
- NACE MR0175 envelope: Qualified to 1000 psi H₂S partial pressure at 400°F, covers virtually every sour gas well in operation
- High strength: 110 ksi YS / 165 ksi UTS in aged condition meets API 6A wellhead bolting requirements (Incoloy 825 at ~45 ksi YS cannot)
- Cl-SCC immunity: 44% nickel content places the alloy above the chloride-SCC immunity threshold
- Cost vs Inconel 718: ~1/3 the price for ~70% of the strength, the workhorse choice for typical sour service
- Non-magnetic: μr ~1.005, suitable for MWD / LWD downhole tool housings
- Cryogenic toughness: 27 J min Charpy at -101°C qualifies for API 6A PSL-3G cryogenic-rated bolting
- NORSOK M-650 qualified: Direct supply to Norwegian Continental Shelf projects
Common Standards (All Fastener Types)
- ASTM B805, UNS N09925 forgings & forging stock (input bar for all fastener types)
- ASTM A193 Grade B8N / ASTM F2281, Bolting materials specifications
- ASTM A320 Grade L7, Cryogenic bolting (-101°C Charpy)
- ASME B18 series, Dimensional standards per fastener type (B18.2.1 hex bolt, B18.2.2 hex nut, B18.2.6 heavy hex, B18.3 socket cap / set screw, B18.21.1 lock washer, B18.22.1 plain washer, B18.31.2 stud bolt, B18.6.3 machine screw, B18.8.x pins)
- ISO 4014 / 4017 / 4032 / 4762 / DIN 933 / 934 / 912 / 7991 / 6885, Metric variants
- API 6A, Wellhead and Christmas tree equipment (PSL-1 to PSL-4)
- API 20E, Bolting quality levels BSL-1 / 2 / 3
- NACE MR0175 / ISO 15156-3, Table A.10 sour service
- NORSOK M-630 MDS A30 / NORSOK M-650, Norwegian Continental Shelf qualification
- EN 10204 3.1 / 3.2, Manufacturer's / TPI-witnessed certification
Application Industries
- Oil & gas downhole, production tubing, packers, hangers, completion safety valves, downhole tool joints
- Wellhead bolting, tubing / casing hangers, body bolting, flange bolting per API 6A PSL-3 / 3G / 4
- Surface safety valves (SSV / SSSV), valve bodies, stems, bonnet bolting, trim cages
- Drill string tool joints, sour H₂S drilling, extended-reach completions
- Marine + offshore, subsea fasteners, FPSO turret components, splash-zone bolting
- Sour-service refining + petrochemical, H₂S-bearing process equipment fastening
- Nuclear, per ASME III Code Case 2727 acceptance
- Aerospace, high-strength CRA fasteners (limited applications)
- Power generation, geothermal wellhead, gas turbine
Documentation Package (Standard)
- EN 10204 3.1 manufacturer's MTC (3.2 with DNV / Bureau Veritas / Lloyd's / TUV / SGS witness on request)
- Heat-lot chemistry vs UNS N09925 limits ASTM B805
- Tensile + RA + elongation per heat / per heat-treatment lot
- 100% hardness inspection per ASTM E18 (within 32–35 HRC NACE band)
- Charpy V-notch at -46°C / -101°C as applicable (PSL-3 / 3G)
- Heat-treatment furnace chart-recorder traces per heat-treatment specification
- Dimensional inspection ASME B18 series + thread Go / No-Go ASME B1.3
- NACE MR0175 Table A.10 reference (sour-service orders)
- API 6A PSL level reference (wellhead orders) with TPI witness for PSL-4
- NORSOK MDS A30 (NORSOK orders)
- Fastener marking: heat number + UNS N09925 + standard ref + NACE stamp
Frequently Asked Questions
Which Incoloy 925 fastener is most common in oilfield service? The stud bolt + 2× heavy hex nut + washer assembly per API 6A is the volume leader, it is the bolting on every wellhead, Christmas tree, BOP and major production-flange joint in sour H₂S service worldwide.
Difference vs Incoloy 825 fasteners? See Incoloy 925 vs 825: 925 is age-hardenable to 110 ksi YS; 825 is solid-solution at ~45 ksi YS. For high-strength sour bolting, 925 is the only practical choice.
What's the typical lead time? Standard sizes (M10 to M30 / 3/8" to 1-1/8"): 4–6 weeks ex-stock or 6–8 weeks new-melt. Larger sizes / specialty fastener types (12-point / countersunk / welding stud / push bolt): 6–10 weeks. Custom drawings: quote-by-quote. Bottleneck is the 18-hour age cycle.
Are coatings available? Yes, PTFE (Xylan 1424 / 1070 / 1014), Molykote, Dacromet, Xylar 101 / 2, Ceramic and other coating options are available via parent-site coating-fastener pages (see Renowned Brands below). Specify required coating at RFQ stage.
Request a Quote
For Incoloy 925 fasteners of any type with full MTC documentation:
- Email: info@torqbolt.com
- Phone: +91-22-66157017
- WhatsApp: +91-22-66157017
Specify fastener type (or describe application and we'll recommend), diameter × length, thread series, quantity, applicable standards, required MTC level (3.1 / 3.2 with TPI witness), coating preference.
References: ASTM B805; ASTM A193 / A320 / F2281; ASME B18 series; ISO 4014 / 4017 / 4032 / 4762; API Specification 6A; API 20E; NACE MR0175 / ISO 15156-3 Table A.10; NORSOK M-630 / M-650; EN 10204; ASME III Code Case 2727. Special Metals Corporation INCOLOY® alloy 925 Technical Bulletin. INCOLOY® is a registered trademark of Special Metals Corporation.
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