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    2. ASTM F467 Grade N05500

    ASTM F467/F467M Grade N05500 Alloy 500 Nuts Specification

    High-strength nickel copper alloy nuts for marine and chemical industries.

    ASTM F467/F467M Grade N05500 Alloy 500 Nuts provide superior corrosion resistance, mechanical strength, and durability in marine and offshore 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 N05500 500 Ni-Cu-Al 2.30- 3.15 0.25 . . . balance 2.0 1.5 63.0- 70.0 . . . 0.5 0.35- 0.85 B . . . 0.01 . . . . . . . . .
    • (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 500 F 467W 24 HRC 130 140
    • (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 500 F467MW 24 HRC 900

    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 K-500 (N05500)?

    Monel K-500 is the age-hardenable variant of Monel 400, with aluminum (~2.3-3.15%) and titanium (~0.35-0.85%) added for precipitation hardening. After solution + age treatment delivers tensile 130-180 ksi, yield 80-125 ksi - roughly 2x stronger than annealed Monel 400 while retaining most of its corrosion resistance. Per ASTM F467 for nonferrous nut where higher strength is required.

    What is the heat treatment for Monel K-500?

    Solution treat 1600 F (870 C), water quench, then age 1080 F (580 C) for 8 hours, furnace cool to 900 F (480 C) over 8-10 hours, hold 6-8 hours, air cool. Different age conditions trade strength for ductility. TorqBolt supplies K-500 in solution-annealed + aged condition with full chemistry + mechanical certification per F467.

    Is Monel K-500 sour-service acceptable?

    Conditional. NACE MR0175 / ISO 15156 permits N05500 only with strict hardness limits and specific aging conditions; consult the current standard for the latest acceptance criteria. TorqBolt can supply K-500 to a customer-specified aging cycle with hardness traceability for sour-service qualification.

    Where is Monel K-500 typically used in nonferrous nut?

    Subsea wellhead bolting, marine propeller shafts, pump impeller studs, oilfield safety valves, and any seawater application where annealed Monel 400 lacks the proof load. Pairs well with Monel 400 nuts per ASTM F467 for matched-alloy assemblies.

    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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