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 Threaded Rods (UNS N09925)
Continuous-thread rod per ASTM F1554 / DIN 976 — long lengths for cut-to-length bolting + anchor rod service
Incoloy 925 threaded rods (UNS N09925) are continuous-thread cylindrical rods supplied in long lengths (typically 1 m / 3 ft / 6 ft / 12 ft / 6 m) for two distinct uses: (1) cut-to-length stud-bolt manufacture, the field-fabrication alternative to ordering pre-cut stud bolts at every length, useful when bolt lengths vary across a project; and (2) anchor-rod service per ASTM F1554, embedded anchor bolts in concrete foundations, bridge bearings, equipment skids and structural-steel column bases. The threaded rod has the same metallurgy as a stud bolt or hex bolt, aged Incoloy 925 with 110 ksi YS, NACE MR0175 sour-service qualified, but is sold by length (not by individual fastener) and threaded continuously end-to-end. Customers cut to length in the field with a hacksaw or abrasive cutoff wheel, then deburr the cut end before installation. TorqBolt manufactures Incoloy 925 threaded rods in M6 to M64 (1/4" to 4") in lengths to 6 m, in the solution-annealed and aged condition (per heat-treatment specification) with 100% hardness inspection ensuring the 35 HRC NACE MR0175 sour-service cap.
Need Incoloy 925 threaded rods? Email info@torqbolt.com with diameter, length, thread series (UNC / UNF / 8UN / metric), quantity, applicable standards (NACE MR0175 stamp). WhatsApp +91-22-66157017.
Threaded Rod Variants Manufactured
| Variant | Description | Standard | Use |
|---|---|---|---|
| All-thread rod (continuous full thread) | Threaded the entire length, supplied in random or fixed lengths | ASME B1.1 / DIN 976-1 | Cut-to-length stud manufacture; nut-and-rod assemblies |
| Anchor rod (ASTM F1554 Grade A) | One end threaded for nut + concrete-anchor end (bent / hooked / nutted) | ASTM F1554 (CRA equivalent) | Concrete anchor for structural-steel column bases, bridge bearings, equipment skids |
| Studding rod (long stud bar) | Long-form continuous-thread rod intended for stud-bolt manufacture | BS 4882 / ASTM F1554 | Stud-bolt blank for downstream cutting + double-end machining |
| Tie rod (long structural) | Long-length tension rod, typically with end fittings (clevis, eye, fork) | Customer + ASTM A36 reference geometry | Architectural / mechanical tension members |
| Hanger rod | Lighter-duty threaded rod for suspension / overhead support | ASTM F1554 / DIN 976 | Pipe-support hangers, ceiling fixtures, tray-rack suspension |
| Acme thread rod | Acme-series 29° trapezoidal thread (vs UN 60° thread) | ASME B1.5 (Acme) | Power-transmission screws, jack screws, lead-screw applications |
Standard Size Range & Lengths
| Diameter | UNC (inch) | UNF (inch) | Metric Coarse | Standard Lengths | Maximum Length |
|---|---|---|---|---|---|
| 1/4" / M6 | UNC 20 | UNF 28 | M6 × 1.0 | 1 m / 1 ft / 3 ft / 6 ft | 3 m |
| 5/16" / M8 | UNC 18 | UNF 24 | M8 × 1.25 | 1 m / 1 ft / 3 ft / 6 ft | 3 m |
| 3/8" / M10 | UNC 16 | UNF 24 | M10 × 1.5 | 1 m / 1 ft / 3 ft / 6 ft | 6 m |
| 7/16" / M12 | UNC 14 | UNF 20 | M12 × 1.75 | 1 m / 3 ft / 6 ft / 2 m | 6 m |
| 1/2" / M14 | UNC 13 | UNF 20 | M14 × 2.0 | 1 m / 3 ft / 6 ft / 2 m | 6 m |
| 5/8" / M16 | UNC 11 | UNF 18 | M16 × 2.0 | 1 m / 3 ft / 6 ft / 2 m | 6 m |
| 3/4" / M20 | UNC 10 | UNF 16 | M20 × 2.5 | 3 ft / 6 ft / 2 m | 6 m |
| 7/8" / M22 | UNC 9 | UNF 14 | M22 × 2.5 | 3 ft / 6 ft / 2 m | 5 m |
| 1" / M24 | UNC 8 / 8UN | UNF 12 | M24 × 3.0 | 3 ft / 6 ft / 2 m | 5 m |
| 1-1/8" / M30 | UNC 7 / 8UN | UNF 12 | M30 × 3.5 | 3 ft / 6 ft / 2 m | 5 m |
| 1-1/4" / M33 | UNC 7 / 8UN | UNF 12 | M33 × 3.5 | 3 ft / 6 ft / 2 m | 5 m |
| 1-3/8" / M36 | UNC 6 / 8UN | UNF 12 | M36 × 4.0 | 3 ft / 6 ft / 2 m | 4 m |
| 1-1/2" / M39 | UNC 6 / 8UN | UNF 12 | M39 × 4.0 | 3 ft / 6 ft / 2 m | 4 m |
| 1-3/4" / M45 | 8UN | M45 × 4.5 | 3 ft / 6 ft | 3 m | |
| 2" / M48 | 8UN | M48 × 5.0 | 3 ft / 6 ft | 3 m | |
| 2-1/2" / M56 | 8UN | M56 × 5.5 | 3 ft / 6 ft | 3 m | |
| 3" / M64 | 8UN | M64 × 6.0 | 3 ft / 6 ft | 2 m | |
| 4" | 8UN | 3 ft / 6 ft | 2 m |
Long-length availability: the 6 m maximum is set by primary mill bar-stock length and the 18-hour age cycle furnace clearance. Longer custom lengths possible by butt-welding two segments (per welding spec) but typically not preferred, specify max 6 m per piece for normal supply.
Mechanical Property Requirements
| Property | Aged Condition (ASTM B805 min) |
|---|---|
| Tensile Strength | 165 ksi (1140 MPa) min |
| 0.2% Yield Strength | 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 (NACE sour service) |
For ASTM F1554 anchor-rod variant: Grade 36 minimum yield (36 ksi) is far exceeded by Incoloy 925 (110 ksi YS); the F1554 grade designation is used as a strength-class reference only, the actual product strength is the ASTM B805 minimum.
Applicable Standards
- ASTM B805, UNS N09925 forging stock (input bar)
- ASME B1.1, Unified Inch Screw Threads (UN / UNR thread series, tolerance class 2A external)
- ASME B1.13M, Metric Screw Threads (M-series, tolerance 6g external)
- DIN 976-1, Threaded studs / rods (German metric standard)
- ASTM F1554, Anchor Bolts, Steel, 36, 55, and 105-ksi Yield Strength (CRA equivalent for Incoloy 925)
- BS 4882, Bolting for flanges and pressure-containing purposes (UK reference)
- ASTM A193 Grade B8N, Bolting Materials for High-Temperature or High-Pressure Service
- ASTM F2281, Standard Specification for Stainless Steel and Nickel-Alloy Bolts
- API 6A, Wellhead and Tree Equipment, when used for studding service
- NACE MR0175 / ISO 15156-3, Table A.10 sour-service qualification
- NORSOK M-630 MDS A30, Norwegian Continental Shelf bolting
- EN 10204 3.1 / 3.2, certification
API 6A PSL Documentation Levels
| PSL | Pressure Class | Charpy | NDE |
|---|---|---|---|
| PSL-1 | 2,000–5,000 psi | Not required | Visual |
| PSL-2 | 5,000–10,000 psi | Not required | UT or MT |
| PSL-3 | 10,000–15,000 psi | 27 J at -29°C | 100% UT |
| PSL-3G | 10,000–15,000 psi gas | 27 J at -46°C / -101°C | 100% UT + grain size |
| PSL-4 | 15,000–20,000 psi | 40 J at -46°C | 100% UT + 100% MT + TPI witness |
Manufacturing Sequence
- Bar input: Incoloy 925 round bar per ASTM B805 in annealed condition. Bar diameter slightly larger than nominal thread diameter to allow thread rolling.
- Cut to length: Bar cut to specified rod length (typically 1 m / 6 ft / 2 m / 6 m) plus thread-form allowance at both ends.
- End facing + chamfering: Both rod ends machined perpendicular and chamfered ASME B1.1 thread form.
- Continuous thread rolling: Threads applied in solution-annealed condition by die-rolling on a thread-rolling machine. Cold-rolled threads have residual compressive stress at the root, improving fatigue life vs single-point cut threads. Continuous rolling is the standard for threaded rod, cut threading is impractical for the long-length form.
- Solution anneal + age cycle: Per heat-treatment specification, 1900°F WQ + 1365°F × 8h FC + 1150°F × 8h AC. Long-length furnace requires careful loading to avoid bow / distortion.
- Straightening (post-age): Each rod straightened on a roller-straightening machine to within ±1 mm/m straightness tolerance. The age cycle can introduce minor bow that must be removed.
- Final inspection: Length tolerance ±3 mm; thread Go / No-Go gauging on both ends ASME B1.3; 100% Rockwell hardness; sample tensile + Charpy.
- Marking: Heat number + UNS N09925 + thread spec stamped on one end of each rod (or affixed to packaging for thinner rods where stamping is impractical).
Companion Components
- Hex nuts + heavy hex nuts, mating nuts (specify nut quantity per rod end)
- Flat washers + lock washers, load distribution + retention
- Coupling nuts, for joining two threaded rods end-to-end (rare but available)
- End caps, protective caps for shipping / storage
- Embedment plates / leveling nuts, for ASTM F1554 anchor-rod service in concrete foundations
- Thread compound, sulphur-free, copper-free anti-seize per API RP 7A1
Application Examples
- Cut-to-length stud-bolt manufacture: Field cutting of long threaded rod into stud-bolt segments where lengths vary across a project
- ASTM F1554 anchor rods: Embedded anchor bolts in sour-environment concrete foundations (offshore platform pedestals, equipment skids in chloride-rich atmosphere)
- Pipe-support hangers: Sour-service piping suspension from overhead structure
- Tray-rack suspension: Cable trays in offshore-platform sour atmosphere
- Equipment skid leveling: Foundation bolts for sour-service rotating machinery
- Tie rods (architectural / mechanical): Long tension members in chloride-rich atmosphere
- Bridge bearing anchor rods: Marine + chloride-rich environment bridge bearings
- Tank tie-down rods: Storage tank anchor bolts in sour-service refining / production
- Acme power-transmission screws: Lead screws, jack screws in sour-service equipment
Standard Coatings & Finishes
- Bare (passivated): Per ASTM A380 / A967, standard sour-service finish
- PTFE coating: Xylan 1424 / 1070, reduces thread friction during make-up
- Phosphate + oil: MIL-DTL-16232 + light oil for storage protection
- End caps: Plastic protective end caps for shipping / handling protection
- Cad plate / hot-dip galvanise: NOT applied for nickel-alloy CRA service
Frequently Asked Questions
What's the difference between a threaded rod and a stud bolt? A stud bolt is supplied at a specific finished length (typically 50–1500 mm) with chamfered ends ready for installation. A threaded rod is a long-length continuous-thread bar (1–6 m) supplied for cut-to-length use, the customer cuts to length in the field, deburrs the cut end, and installs. Threaded rods are more economical for projects with many varying bolt lengths; stud bolts are preferred for fixed-design joints where the bolt-length spec doesn't change.
Can I cut Incoloy 925 threaded rod with a hacksaw? Yes, standard high-speed steel (HSS) hacksaw blade or abrasive cutoff wheel. Incoloy 925 work-hardens during cutting, so use moderate pressure + low cutting speed. Cool with cutting fluid (synthetic coolant); avoid sulphur-bearing oils which can leave residues that initiate sour-service SSC. After cutting, deburr the cut end with a file or thread-clean die to restore chamfer.
Are threaded rods NACE MR0175 qualified? Yes, same chemistry, mechanical and heat-treatment as stud bolts. The 35 HRC sour-service hardness cap applies. NACE-stamped MTC available on request. Threaded rods cut to length in the field retain the NACE qualification, the cut introduces no metallurgical change.
What's the difference between ASTM F1554 anchor rod grades? ASTM F1554 covers three grades: Grade 36 (36 ksi YS, low-strength), Grade 55 (55 ksi YS, intermediate), Grade 105 (105 ksi YS, high-strength). Incoloy 925 at 110 ksi YS exceeds all three, for spec compliance, the Incoloy 925 anchor rod is supplied as "F1554 Grade 105 equivalent" with the actual ASTM B805 mechanical envelope reported on the MTC.
What's the typical lead time for Incoloy 925 threaded rods? Standard sizes (M10 to M30 / 3/8" to 1-1/8", lengths 1–3 m): 4–6 weeks. Larger diameters (M36 to M64 / 1-3/8" to 3"): 6–8 weeks. Custom lengths above 4 m: 8–10 weeks (limited by furnace clearance). Acme thread or anchor-rod end-fittings: add 2–3 weeks for the additional machining.
Documentation Package
- EN 10204 3.1 manufacturer's MTC (3.2 with TPI on request)
- Heat-lot chemistry vs UNS N09925 limits
- Tensile + RA + elongation per heat / per heat-treatment lot
- 100% hardness inspection (32–35 HRC NACE band)
- Sample Charpy at -46°C / -101°C as applicable
- Heat-treatment furnace chart-recorder traces
- Length + straightness check per piece (±3 mm length, ±1 mm/m straightness)
- Thread gauging Go / No-Go on both ends ASME B1.3
- NACE MR0175 Table A.10 reference (sour-service orders)
- Rod end marking: heat number + UNS N09925 + thread spec
Related Products
- Stud bolts, pre-cut fixed-length bolting (alternative to cut-to-length rod)
- Hex nuts + heavy hex nuts, mating nuts
- Washers, load distribution + retention
- Round bar, raw material for custom rod manufacture
- Full Incoloy 925 datasheet
Request a Quote
For Incoloy 925 threaded rods with full MTC documentation:
- Email: info@torqbolt.com
- Phone: +91-22-66157017
- WhatsApp: +91-22-66157017
Specify diameter, length (random / fixed / custom), thread series (UNC / UNF / 8UN / metric / Acme), variant (all-thread rod / F1554 anchor rod / studding / tie / hanger), quantity, applicable standards (API 6A PSL level, NACE MR0175 stamp, NORSOK MDS A30, ASTM F1554 grade), required MTC level (3.1 / 3.2 with TPI witness) and any coating / end-cap / end-fitting requirement.
References: ASTM B805; ASTM A193 / F2281; ASTM F1554 (anchor rods); ASME B1.1 / B1.13M / B1.5 (UN / metric / Acme threads); ASME B1.3 (thread gauging); DIN 976-1 (German metric threaded rod); BS 4882 (UK bolting); API Specification 6A Annex M; NACE MR0175 / ISO 15156-3 Table A.10; NORSOK M-630 / M-650; EN 10204; ASTM A380 / A967 (passivation); MIL-DTL-16232. Special Metals Corporation INCOLOY® alloy 925 Technical Bulletin. INCOLOY® is a registered trademark of Special Metals Corporation.
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