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    2. ASTM F467 Grade C46200

    ASTM F467/F467M Grade C46200 Alloy 462 Nuts Specification

    Naval brass alloy nuts engineered for marine and offshore industries.

    ASTM F467/F467M Grade C46200 Alloy 462 Nuts provide excellent corrosion resistance, strength, and durability in demanding seawater applications.

    ASTM F467/F467M Chemical Composition

    ASTM F467/F467M Copper and Copper-Base Alloys

    UNS Designation Number Alloy General Name Al Cu, min Fe, max Mn, max Ni, max P Si Zn, max A Pb, max Tin As, max
    ASTM F467/F467M Grade C46200 462 naval brass . . . 62.0-65.0 0.10 . . . . . . . . . . . . balance 0.20 0.5-1.0 . . .
    • (A) Elements shown as balance shall be arithmetically computed by deducting the sum of the other named elements from 100.

    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 Cu 462 F 467C 65 HRB 50 54
    • (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 Cu 462 F467MC 65 HRB 345

    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 Naval Brass C46200?

    Naval brass C46200 is a Cu-Zn-Sn alloy (~62 Cu, 37 Zn, 0.6-1.0 Sn) per ASTM F467 - the tin addition gives dezincification resistance suitable for seawater service. Tensile 60-75 ksi. The classic alloy for marine nut where cost matters more than ultimate corrosion performance.

    How does C46200 compare to C46400 naval brass?

    C46200 has slightly different Cu/Zn ratio (60/40 nominally vs 60/40 for C46400) with similar tin content. C46400 is the more-common naval brass spec; C46200 is essentially interchangeable for most marine nut applications.

    Seawater nut performance?

    Acceptable for clean seawater service at ambient temperature. For severe marine conditions (warm sea water, chloride pitting, polluted harbor water), step up to nickel-aluminum bronze C63000 or cupro-nickel C71500.

    Available dimensional patterns?

    ASME B18.2.1 hex bolts, B18.5 round head, B18.6.7M metric machine screws, B16.5 flange studs (marine valve service).

    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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