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    2. Grade A96061

    ASTM F468/F468M Grade A96061 6061 Aluminum 6061 Fasteners

    High quality ASTM F468 Aluminum 6061 fasteners manufactured for industrial and corrosion resistant applications.

    ASTM F468/F468M Grade A96061 Aluminum 6061 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 B Cr Cu Fe, max Mn, max Si, max Ti, max Zn, max Mg Other Elements, max
    Each Total
    Grade A96061 6061 Aluminum 6061 balance 0.04-0.35 0.15-0.40 0.7 0.15 0.40-0.8 0.15 0.25 0.8-1.2 0.05 0.15
    • (A) Analysis shall regularly be made only for the elements specified in this table. If, however, the presence of other elements
    • is suspected or indicated in amounts greater than the specified limits, further analysis shall be made to determine that these elements are not present in excess of the specified limits.
    • (B) Elements shown as balance shall be arithmetically computed by deducting the sum of the other named elements from 100.
    • (C) Titanium + zirconium 0.20 %, max.
    • (D) Titanium + zirconium 0.25 %, max.

    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
    Al 6061-T6 F F468Y All 40-50 HRB 37-52 31 42 35 10
    • (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 A96061 6061 Aluminum 6061 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 A96061 6061 Aluminum 6061 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 6061 (A96061)?

    Aluminum 6061 is an Al-Mg-Si alloy (~1.0 Mg, 0.6 Si, 0.28 Cu, 0.20 Cr) - the workhorse general-purpose structural aluminum per ASTM F468 for nonferrous bolting. Standard temper for bolts is T6 (artificially aged): tensile 42 ksi, yield 35 ksi, elongation 10%. Excellent weldability + corrosion resistance, moderate strength.

    When use 6061-T6 aluminum bolts?

    Marine fastenings, structural framing, transportation equipment, and any application requiring lightweight + atmospheric/seawater corrosion resistance. Most common general-purpose aluminum fastener. Pair with 6061 nuts per ASTM F467 to avoid galvanic mismatch.

    How does 6061 corrosion resistance compare to 2024?

    6061 is dramatically better in chloride environments because it has only 0.28% copper (vs 4.4% in 2024). Used widely in marine + saltwater structural bolting. 7075 (zinc-based) is better in some industrial atmospheres but less weldable than 6061.

    Available dimensional patterns?

    Available across the full F468 range: ASME B18.2.1 hex bolts, B18.3 socket head, B18.6.7M metric machine screws, B16.5 flange studs. Typically supplied in T6 temper unless customer specifies otherwise.

    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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