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    2. Grade C61300

    ASTM F468/F468M Grade C61300 613 Aluminum Bronze Fasteners

    High quality ASTM F468 Aluminum Bronze fasteners manufactured for industrial and corrosion resistant applications.

    ASTM F468/F468M Grade C61300 Aluminum Bronze fasteners are manufactured in accordance with ASTM specifications for nonferrous bolts, hex cap screws, socket head cap screws, and studs.

    Chemical Requirements

    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
    Grade C61300 613 aluminum bronze 6.0-7.5 B 2.0-3.0 0.10 0.15 C 0.015 0.10 0.05 0.01 0.20-0.50 . . .
    • (A) Elements shown as balance shall be arithmetically computed by deducting the sum of the other named elements from 100.
    • (B) Copper plus specified elements = 99.8 min; copper plus silver = 88.5-91.5.
    • (C) Cobalt is to be counted as nickel.
    • (D) Minimum content of copper plus all other elements with specified limits shall be 99.5 %.
    • (E) An alloy containing as high as 2.6 % silicon is acceptable provided the sum of all the elements other than copper, silicon, and iron does not exceed 0.30 %.

    Mechanical Requirements

    Alloy Mechanical Property Marking Nominal Thread Diameter, in. Hardness A Full-Size Tests B Machined Specimen Tests
    Tensile Strength, ksi Yield Strength, min, ksi C Tensile Strength, min, ksi Yield Strength min, ksi C Elongation in 4D, min, % D
    Alloy Cu 613 F 468F 0.250-0.500 70-95 HRB 80-110 50 80 50 30
    • (A) Where both tension and hardness tests are performed, the tension tests shall take precedence for acceptance purposes. For aluminum and titanium alloys, hardness tests are for information only. See 6.5.
    • (B) The yield and tensile strength values for full-size products shall be computed by dividing the yield and maximum tensile load by the stress area for the product diameter and thread pitch as given in table on tensile stress areas.
    • (C) Yield strength is the stress at which an offset of 0.2 % gage length occurs.
    • (D) Elongation is determined using a gage length of 4 diameters of test specimen in accordance with Test Methods E8/E8M.
    • (E) "HF" denotes a hot-formed product.
    • (F) Aluminum alloy temper designations are in accordance with ANSI H35.1.
    • (G) Full-size test mechanical properties apply to fasteners with a maximum diameter of 76 mm. Mechanical properties of larger sections shall be negotiated between the material manufacturer and the fastener producer.
    • (H) Ti 5 Class A requires wedge tensile testing in accordance with Ti 5 Class B requires wedge tensile testing in accordance.

    ASTM F468/F468M Grade C61300 613 Aluminum Bronze Tensile Stress Areas and Threads(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 / 18 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 F468/F468M Grade C61300 613 Aluminum Bronze Tensile Stress Areas (Metric)

    Nominal Product Diameter and Thread Pitch Stress Area, A mm 2 Nominal Product Diameter and Thread Pitch Stress Area, A mm 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:
    • A s = 0.7854 (D − 0.9382 P) 2
    • where:
    • As = stress area, mm2,
    • D  = nominal thread diameter, mm, and
    • P  = thread pitch, mm.

    Frequently Asked Questions

    What is Aluminum Bronze C61300?

    Aluminum bronze C61300 is a Cu-Al-Fe alloy (~89 Cu, 7 Al, 3 Fe) per ASTM F468 - the aluminum addition forms a protective Al2O3 surface film giving excellent seawater + chloride corrosion resistance. Tensile 75-95 ksi. Stronger and more corrosion-resistant than naval brass.

    How does C61300 compare to C63000?

    Both are aluminum bronzes; C63000 adds nickel (4-5.5%) for additional strength + cavitation resistance. C61300 is the lower-cost aluminum bronze for general marine bolting; C63000 is the premium choice for pump impellers, high-load marine fasteners, and severe service.

    Marine bolting applications?

    Heat exchanger tube-sheet bolting in seawater service, marine propeller hardware, valve trim bolting, and any seawater application where naval brass is inadequate but cupro-nickel + super-duplex are overkill.

    Available dimensional patterns?

    Full F468 inch + metric range. ASME B16.5 flange studs and B18.2.1 hex cap screws are the highest-volume aluminum bronze fasteners.

    References & Standards

    • ASTM F468 / F468M - Standard Specification for Nonferrous Bolts, Hex Cap Screws, and Studs for General Use
    • ASTM F467 / F467M - Companion specification for Nonferrous Nuts (mate with F468 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 B18.2.1 / B18.2.3 series / B18.3 / B18.6.7M / B18.31 / B16.5 - Dimensional standards referenced by F468
    • DIN 912 / 933 / 931 - Metric hex socket head and hex head cap screw dimensional standards
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