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    2. ASTM F467 Grade C26000

    ASTM F467/F467M Grade C26000 Alloy 260 Nuts Specification

    Brass alloy nuts engineered for strength, corrosion resistance, and industrial reliability.

    ASTM F467/F467M Grade C26000 Alloy 260 Nuts are widely used in architectural, industrial, and engineering applications because of their excellent corrosion resistance and machinability.

    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 C26000 260 brass . . . 68.5-71.5 0.05 . . . . . . . . . . . . balance 0.07 . . . . . .
    • (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 260 F467AB 55 HRF 60 65
    • (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 260 F467MAB 55 HRF 415

    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 Brass C26000 (Cartridge Brass)?

    Brass C26000 is the classic 70/30 Cu-Zn cartridge brass per ASTM F467 - excellent cold-formability, moderate strength (tensile 47-76 ksi depending on temper), and good corrosion resistance in fresh water and mild atmospheres. Standard general-purpose brass for decorative + plumbing + light structural bolting.

    How does C26000 compare to naval brass (C46400)?

    C26000 has no tin addition; naval brass C46400 adds 0.6-1.0% Sn for improved dezincification resistance in seawater. Choose C26000 for fresh-water and atmospheric service; choose C46400 for marine nut applications.

    Common applications for cartridge brass bolts?

    Architectural hardware, decorative bolts, low-stress plumbing assemblies, electrical terminal bolts, and matched-brass-assembly bolting. Not used for high-load structural service.

    Available dimensional patterns?

    ASME B18.2.1 hex bolts, B18.5 round-head carriage bolts, B18.6.7M metric machine screws. Cartridge brass cold-works easily so cold-formed head shapes are routinely available.

    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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