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    2. ASTM F467 Grade C46400

    ASTM F467/F467M Grade C46400 Alloy 464 Nuts Specification

    Naval brass alloy nuts manufactured for seawater corrosion resistance.

    ASTM F467/F467M Grade C46400 Alloy 464 Nuts are widely used in shipbuilding and offshore industries because of their excellent resistance to marine corrosion.

    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 C46400 464 naval brass . . . 59.0-62.0 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 464 F 467D 55 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 464 F467MD 55 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 C46400?

    Naval brass C46400 is the standard marine-bolting brass per ASTM F467 - Cu-Zn-Sn (~60 Cu, 39.5 Zn, 0.5-1.0 Sn) with the tin addition providing dezincification resistance. Tensile 55-78 ksi. The most-specified naval brass for shipboard, marine hardware, and seawater valve bolting.

    Why is the tin addition important?

    Without tin, brass alloys dezincify rapidly in seawater - zinc leaches out leaving a porous copper skeleton with no strength. 0.5-1% tin disrupts the dezincification mechanism. C46400 is fundamentally a seawater-service brass.

    Galvanic considerations for marine nut applications?

    Pair C46400 with brass/bronze workpieces or with cupro-nickel C71500. Direct contact with aluminum hull plate causes severe galvanic attack on the aluminum. With stainless steel, the brass becomes the sacrificial anode and corrodes preferentially.

    Available dimensional patterns?

    Full F467 range - ASME B18.2.1 hex bolts, B18.5 round head, B16.5 flange studs, B18.6.7M metric machine screws. Most-stocked naval brass dimensional spec.

    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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