Specifications
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
- NORSOK M-650
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
Monel 400 Threaded Rod & All-Thread - UNS N04400 ASTM F468
Monel 400 threaded rod (also Monel 400 all-thread, Monel 400 studding, Monel 400 threaded bar, Alloy 400 threaded rod, UNS N04400 threaded rod, Werkstoff 2.4360 threaded rod) is continuous-thread bar of nickel-copper alloy UNS N04400 cut from ASTM B164 annealed round bar, threaded to ASME B1.1 UNC / UNF or DIN 975 / DIN 933. Mechanical floor matches ASTM F468: 40 ksi yield 0.250 to 0.750 in, 30 ksi yield 0.875 to 1.500 in, 25 HRC hardness cap. Stocked M6 to M40 metric, 1/4 to 1-1/2 in imperial, lengths to 3 m. Used for HF acid line bolting, marine standoffs, naval bulkhead studs and sour-service tie rods. Monel® is a registered trademark of Special Metals Corporation; TorqBolt is not authorized by, affiliated with or endorsed by Special Metals.
Scope and Thread Types for Monel 400 Threaded Rod
The rod is long-form stud stock with the bolt mechanical contract from ASTM F468 carried onto the cut studding. ASME B1.1 UNC and UNF cover imperial 1/4 to 1-1/2 in. DIN 975 / DIN 976 / ISO 4017 cover metric M6 to M40 in 1 m and 3 m mill lengths to the DIN 933 profile. ACME trapezoidal threads on indent for valve stems and lifting jacks. Left-hand thread on request.
| Thread system | Profile spec | Diameter range | Typical use |
|---|---|---|---|
| UNC (coarse) | ASME B1.1 | 1/4 to 1-1/2 in | General flange bolting, marine standoffs |
| UNF (fine) | ASME B1.1 | 1/4 to 1-1/2 in | High-vibration joints, instrument racks |
| Metric coarse | DIN 975 / DIN 976 / ISO 4017 | M6 to M40 | European refinery, NORSOK, naval marine |
| Metric fine | DIN 13 | M8 to M40 | Hydraulic manifolds, sensor mounts |
| ACME trapezoidal | ASME B1.5 | 1/2 to 2 in | Valve stems, lifting jacks (indent) |
Monel 400 Threaded Rod Size and Length Range
Stocked metric M6 to M40, imperial 1/4 to 1-1/2 in. Mill lengths 1 m and 3 m on metric, 3 ft and 6 ft imperial. Cut-to-length down to 50 mm. Diameters above M40 ship from ASTM B564 forging stock on indent.
| Metric size | Pitch (coarse) | Imperial equivalent | UNC tpi | Tensile area UNC (sq.in) | Stocked length |
|---|---|---|---|---|---|
| M6 | 1.00 | 1/4 in | 20 | 0.0318 | 1 m, 3 m |
| M8 | 1.25 | 5/16 in | 18 | 0.0524 | 1 m, 3 m |
| M10 | 1.50 | 3/8 in | 16 | 0.0775 | 1 m, 3 m |
| M12 | 1.75 | 1/2 in | 13 | 0.1419 | 1 m, 3 m |
| M16 | 2.00 | 5/8 in | 11 | 0.226 | 1 m, 3 m |
| M20 | 2.50 | 3/4 in | 10 | 0.334 | 1 m, 3 m |
| M24 | 3.00 | 1 in | 8 | 0.606 | 1 m, 3 m |
| M30 | 3.50 | 1-1/4 in | 7 | 0.969 | 1 m, 3 m |
| M36 | 4.00 | 1-1/2 in | 6 | 1.405 | 1 m, 3 m |
| M40 | 4.50 | 1-5/8 in | 5.5 | 1.680 | 1 m, 3 m |
Length tolerance plus 6 mm / minus 0. Straightness 1 mm per metre. Thread class 6g metric or 2A imperial standard.
Mechanical Properties per ASTM F468 (UNS N04400)
Mechanicals pulled from ASTM F468 Table 2 because the rod is loaded as long-form bolt stock; the matching ASTM B164 bar floor is held in parallel. F468 caps hardness at 25 HRC, below the NACE MR0175 nickel-copper ceiling of 35 HRC.
| Property | F468 0.250 to 0.750 in (M6 to M20) | F468 0.875 to 1.500 in (M22 to M40) | B164 hot-finished annealed bar |
|---|---|---|---|
| Tensile strength, ksi (MPa) | 80 to 130 (552 to 896) | 70 to 130 (483 to 896) | 70 min (480 min) |
| Yield 0.2% offset, min ksi (MPa) | 40 (276) | 30 (207) | 25 (170) |
| Elongation in 2 in., min | 20% | 20% | 35% |
| Hardness, max | 25 HRC | 25 HRC | B60 to B75 HRB |
| Reduction of area, min | 50% | 50% | 40% |
Detail on the mechanical properties page. Class A (Ni 400, weldable) is default; class B (Ni 405, free-machining) ships where the rod will not be welded.
Surface Finishes for Monel 400 Threaded Rod
Surface and end-condition controls thread engagement, galling resistance and downstream coating compatibility. Specify on the RFQ.
- Mill (as-rolled) - as-threaded matte, no post-treatment. General refinery, dry indoor flange bolting.
- Bright drawn - cold-drawn bar before threading, Ra under 0.8 micrometre. Instrument racks, hydraulic manifolds.
- Passivated - HNO3 dip, oxide film removed. HF acid duty, pharma reactor tie rods.
- PTFE-coated - Xylan 1424 or equivalent fluoropolymer film. Subsea, splash-zone, anti-galling sour studs.
- Silver-plated thread - electroplated silver on UNC or metric thread. High-temperature naval and aero studs.
Full coating menu on the TorqBolt coatings page. Default ends chamfered 45 degrees; square-sawn on drawing call-out.
Applications for Monel 400 Threaded Rod
The rod runs where the joint sees fluoride acid, flowing seawater, sour gas at NACE limits or a non-magnetic spec:
- HF alkylation flange bolting per API RP 751; see HF alkylation and HF acid resistance.
- Marine standoffs and deck-mount studs on offshore platforms; see marine and seawater corrosion.
- Naval bulkhead studs for non-magnetic compartments, sonar rooms and degaussing coils. See magnetic permeability.
- Sour-service tie rods on Christmas-tree clamps and gas-processing skids per NACE MR0175.
- Heat exchanger tie rods bracing tube bundles in brackish-water coolers.
- Caustic evaporator anchor studs on NaOH bodies to 80 percent caustic at 150 C.
NACE MR0175 Sour Service Compatibility
Class A Monel 400 rod is qualified for H2S sour service to F468 mechanicals. The 25 HRC hardness cap clears the NACE MR0175 / ISO 15156-3 ceiling of 35 HRC. Cold work in threading must not push hardness past 25 HRC; thread-rolled rod carries a hardness reading on the MTC. Verify H2S partial pressure and chloride against ISO 15156-3 Annex A.4. Sour shipments carry EN 10204 type 3.2 plus NACE statement. See sour service applications.
Certification, PMI and Traceability
Every cut length is heat-numbered and stamped with heat number, diameter, thread spec and UNS N04400. EN 10204 type 3.1 standard; type 3.2 on indent for nuclear, NACE and NORSOK. PMI by hand-held XRF or OES at receipt.
| Certificate | What it covers | Typical use |
|---|---|---|
| EN 10204 type 3.1 | Heat-specific MTC, mill metallurgist sign-off | Standard commercial, refinery, marine |
| EN 10204 type 3.2 | 3.1 plus third-party inspector counter-signature | NACE sour, nuclear, NORSOK, customer witness |
| PMI report | Hand-held XRF or OES verification of Ni and Cu | Receipt inspection, HF acid duty |
| Hardness report | Rockwell HRC reading on threaded length | NACE MR0175 25 HRC verification |
| NACE statement | MR0175 / ISO 15156-3 compliance clause on MTC | Sour-service gas-processing skids |
Traceability chain: heat to bar to cut length to threaded stud, preserved on the MTC and stencil. See data sheet and specifications.
Frequently Asked Questions on Monel 400 Threaded Rod
What is Monel 400 threaded rod? A continuous-thread bar of nickel-copper alloy UNS N04400 cut from ASTM B164 round bar and threaded to ASME B1.1 or DIN 975. Mechanicals match the ASTM F468 bolt floor with a 25 HRC hardness cap. Sold M6 to M40 and 1/4 to 1-1/2 in, lengths to 3 m. Also called all-thread, studding or threaded bar.
What thread standards apply? ASME B1.1 UNC and UNF for imperial. DIN 975 / DIN 976 / ISO 4017 for metric coarse. DIN 13 for metric fine. ACME on indent. Thread class 6g metric or 2A imperial as standard.
Does it match F468 bolt mechanicals? Yes. The rod is cut from ASTM B164 annealed bar; B164 sets the same floor and class A is sold against the F468 25 HRC hardness cap. NACE MR0175 sour-service compliance follows because 25 HRC sits below the 35 HRC nickel-copper ceiling.
Related Pages
Standards: ASTM F468, B164, F467, NACE MR0175. Fasteners: bolts, stud bolts, hex bolts, nuts, washers. Forms: round bar, plate, forging, flanges. Properties: mechanical, magnetic permeability, HF acid. Applications: HF alkylation, sour service, marine, UNS N04400, what is Monel 400, pricing, main reference.
Request a Quote. For Monel 400 threaded rod to ASTM F468 / B164, UNC / UNF / DIN 975 thread, M6 to M40 or 1/4 to 1-1/2 in, EN 10204 3.1 or 3.2 MTC: send diameter, thread, length, finish and quantity to info@torqbolt.com or WhatsApp +91-22-66157017. Heat-numbered MTC and ex-Mumbai price within one working day. Export through JNPT.
References. ASTM F468/F468M Table 2. ASTM B164 Table 2. ASME B1.1, B1.5. DIN 933 / 975 / 976 / 13. ISO 4017. NACE MR0175 / ISO 15156-3. EN 10204. API RP 751.
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