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    2. ASTM F467 Grade N04400

    ASTM F467/F467M Grade N04400 Alloy 400 Nuts Specification

    Premium nickel copper alloy nuts for marine and chemical processing applications.

    ASTM F467/F467M Grade N04400 Alloy 400 Nuts are widely used for marine and offshore industries due to their exceptional resistance to seawater and corrosive environments.

    ASTM F467/F467M Chemical Composition

    ASTM F467/F467M Nickel and Nickel-Base Alloys

    UNS Designation Number Alloy General Name Al C, max Cr Cu A Fe, max Mn, max Ni A P, max Si, max Ti Co, max Mo S, max V W Cb †
    ASTM F467/F467M Grade N04400 400 Ni-Cu Class A . . . 0.3 . . . balance 2.5 2.0 63.0- 70.0 . . . 0.5 . . . B . . . 0.024 . . . . . . . . .
    • (A) Elements shown as balance shall be arithmetically computed by deducting the sum of the other named elements from 100.
    • (B) Cobalt is to be counted as nickel.

    ASTM F467/F467M Mechanical Requirements

    ASTM F467/F467M Mechanical Requirements (Inch)

    Alloy Mechanical Property Marking Hardness, min A Proof Stress, Hex Nut min, ksi Proof Stress, Heavy Hex Nut min, ksi B
    ASTM F467 Alloy Ni 400 F 467U 60 HRB 80 86
    • (B) Proof stress values for heavy hex nuts are based on 1.08 times the value for corresponding regular hex nuts.

    ASTM F467M Mechanical Requirements (Metric)

    Alloy Mechanical Property Marking Hardness, min A Proof Stress, Mpa
    ASTM F467M Ni 400 F467MU 60 HRB 550

    ASTM F467/F467M Tensile Stress Areas and Threads per Inch

    Nominal Size, in. Coarse Threads-UNC Fine Threads-UNF 8 Thread Series-8UN
    Threads/in. Stress Area A, in 2 Threads/in. Stress Area A, in 2 Threads/in. Stress Area A, in 2
    1/ 4 20 0.0318 28 0.0364 . . . . . .
    5/ 16 18 0.0524 24 0.0580 . . . . . .
    3/ 8 16 0.0775 24 0.0878 . . . . . .
    7/ 16 14 0.1063 20 0.1187 . . . . . .
    1/ 2 13 0.1419 20 0.1599 . . . . . .
    9/ 16 12 0.1820 18 0.2030 . . . . . .
    5/ 8 11 0.2260 18 0.2560 . . . . . .
    3/ 4 10 0.3340 16 0.3730 . . . . . .
    7/ 8 9 0.4620 14 0.5090 . . . . . .
    1 8 0.6060 12 0.6630 . . . . . .
    1 1/ 8 7 0.7630 12 0.8560 8 0.790
    1 1/ 4 7 0.9690 12 1.0730 8 1.000
    1 3/ 8 6 1.1550 12 1.3150 8 1.233
    1 1/ 2 6 1.4050 12 1.5810 8 1.492
    • (A) Tensile stress areas are computed using the following formula:
    • A s = 0.7854 [ D - 0.9743/n ]
      • where:
      • As = tensile stress area, in. 2 ,
      • D = nominal size (basic major diameter), in., and
      • n = number of threads per inch.

    ASTM F467/F467M Tensile Stress Areas and Threads per Metric

    Nominal Nut Diameter and Thread Pitch Stress Area, Amm 2 Nominal Nut Diameter and Thread Pitch Stress Area, Amm 2
    M6 × 1 20.1 M16 × 2 157
    M8 × 1.25 36.6 M20 × 2.5 245
    M10 × 1.5 58.0 M24 × 3 353
    M12 × 1.75 84.3 M30 × 3.5 561
    M14 × 2 115 M36 × 4 817
    • (A) Tensile stress areas are computed using the following formula:
    • As = 0.7854 (D − 0.9382P) 2
      • where:
      • As = tensile stress area, mm. 2 ,
      • D = nominal size (basic major diameter), mm., and
      • n = number of threads per mm.

    ASTM F467/F467M Heat Treatment

    Alloy Condition
    Copper (all alloys) As formed or stress relieved at manufacturer's option
    Nickel alloys 400 and 405 As formed or stress relieved at manufacturer's option
    Nickel alloy 500 Solution annealed and aged
    Aluminum alloy 2024-T4 Solution treated and naturally aged
    Aluminum alloy 6061-T6 Solution treated and artificially aged
    Aluminum alloy 6262-T9 Solution treated, artificially aged, and cold worked
    Titanium 625 Annealed

    Frequently Asked Questions

    What is Monel 400 (N04400) per ASTM F467?

    Monel 400 (N04400) is a nickel-copper alloy (~67 Ni / 33 Cu) covered under ASTM F467 for nonferrous nuts. It offers excellent resistance to chloride stress-corrosion cracking, seawater, and dilute hydrofluoric acid. Tensile 70 ksi min, yield 25-50 ksi (annealed) to 85+ ksi (cold-worked), elongation 35% min. Manufactured by TorqBolt as hex nuts, heavy hex nuts, square nuts, and lock nuts per ASME B18.2.2 and ISO 4032 / 4033 / 4035.

    Are Monel 400 nuts NACE MR0175 acceptable for sour service?

    Yes. N04400 is listed in NACE MR0175 / ISO 15156 for downhole and surface nut applications in H2S-containing oil and gas service, subject to the standard's hardness limits. Cold-worked Monel 400 should be specified at a hardness level acceptable under the relevant NACE table. TorqBolt provides NACE-compliant heat-treat and hardness certificates on request.

    Where do Monel 400 nuts outperform other F467 grades in marine service?

    Monel 400 (Ni-Cu) is the lower-cost option for clean seawater, brine, and HF acid nut service and remains the workhorse for shipboard fasteners. Inconel 625 (Ni-Cr-Mo-Nb) is needed when the service adds chloride pitting, oxidizing acids, or higher temperatures (sustained service above ~600 F). Both are F467-covered; choose Monel 400 for cost, Inconel 625 for broader chemical resistance.

    What ASME / ISO dimensional patterns are available in Monel 400 per F467?

    F467 Monel 400 is available across ASME B18.2.2 (hex nuts, heavy hex nuts, square nuts, lock nuts inch series), ASME B18.2.4.1M (metric hex nuts style 1), ISO 4032 (metric hex nuts), ISO 4033 (metric hexagon high nuts), and DIN 934 / 439 (metric hex nut equivalents).

    References & Standards

    • ASTM F467 / F467M - Standard Specification for Nonferrous Nuts for General Use
    • ASTM F468 / F468M - Companion specification for Nonferrous Bolts, Hex Cap Screws, and Studs (mate with F467 nuts for matched-alloy assemblies)
    • ASTM F436 / F436M - Hardened steel washers (ferrous washer companion when nonferrous washers are not specified)
    • NACE MR0175 / ISO 15156 - Sour-service hardness limits for petroleum and natural gas industries
    • ASME B18.2.2 / B18.2.4.1M / B18.2.4.6M and ISO 4032 / 4033 / 4035 - Dimensional standards referenced by F467
    • DIN 934 / 439 / 6330 - Metric hex nut dimensional standards
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