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    2. ASTM F467 Grade A96061

    ASTM F467/F467M Grade A96061 Alloy 6061 Nuts Specification

    Aluminum alloy nuts offering excellent strength and corrosion resistance.

    ASTM F467/F467M Grade A96061 Alloy 6061 Nuts are widely used in automotive, marine, and structural industries because of their lightweight properties and superior durability.

    ASTM F467/F467M Chemical Composition

    ASTM F467/F467M Aluminum-Base Alloys A

    UNS DesignationNumber Alloy GeneralName Al A Cr Cu Fe, max M,max Si,max Ti,max Zn,max Mn Other Elements, max
    Each Total
    ASTM F467/F467M 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.

    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 Al 6061-T6 F 467Y 40 HRB 40 43
    • (A) For aluminum and titanium alloys hardness values are for information only.
    • (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 Al 6061-T6 F467MY 40 HRB 275
    • (A) For aluminum and titanium alloys hardness values are for information only.

    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 Condition (Heat Treatment)

    Except as provided in 4.2.3, nuts are furnished in the condition below (4.2.2). When required, stress relieving is specified by the purchaser for all copper alloys and nickel alloys 400 and 405 (4.2.3). Unless otherwise specified, nuts may be hot pressed, cold formed or machined at the manufacturer's option (4.2.1).

    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 ASTM F467 alloy 6061-T6 (UNS A96061)?

    UNS A96061 is alloy 6061-T6, listed in Table 1 of ASTM F467-13ε2 as aluminum 6061. Key composition limits: magnesium 0.8-1.2 %, silicon 0.40-0.8 %, copper 0.15-0.40 %, chromium 0.04-0.35 %, aluminum balance. Aluminum alloy 6061-T6 is furnished solution treated and artificially aged (4.2.2).

    What hardness and proof stress do F467 alloy 6061-T6 nuts need?

    Table 2 requires a minimum hardness of 40 HRB and a minimum proof stress of 40 ksi for hex nuts and 43 ksi for heavy hex nuts. Heavy hex values are 1.08 times the hex nut value (note B). For aluminum and titanium alloys the hardness values are for information only (note A). Where both proof load and hardness are tested, proof load governs acceptance (6.2).

    What is the proof load of a 1/2-13 UNC F467 alloy 6061-T6 nut?

    Proof load is the Table 2 proof stress times the Table 4 tensile stress area (13.2.1, tested per ASTM F606). For 1/2-13 UNC the stress area is 0.1419 sq in, so a hex nut must carry 5,676 lbf (40 ksi) and a heavy hex nut 6,102 lbf (43 ksi) without failure.

    How are F467 alloy 6061-T6 nuts marked and supplied?

    Each nut carries the manufacturer's symbol and the Table 2 marking F 467Y, raised or depressed (17.1). Unless otherwise specified, dimensions are to ASME B18.2.2 (7.1), threads are Class 2B to ASME B1.1 (7.2) and nuts are furnished without any additive chemical or metallic finish (8.2). Mating bolts, cap screws and studs are covered by ASTM F468 (1.2).

    References & Standards

    • ASTM F467-13ε2 - Standard Specification for Nonferrous Nuts for General Use (inch-pound; F467M is the metric companion, Note 1)
    • ASTM F468 - Nonferrous Bolts, Hex Cap Screws, Socket Head Cap Screws, and Studs for General Use (mating bolts, 1.2)
    • ASME B18.2.2 - Square and Hex Nuts (nut dimensions unless otherwise specified, 7.1)
    • ASME B1.1 - Unified Inch Screw Threads (Class 2B nut threads, 7.2)
    • ASTM F606 - mechanical test methods for proof load (13.2.1); ASTM E18 and E92 - Rockwell and Vickers hardness (13.2.2)
    • ASTM B154 - mercurous nitrate test for copper alloys (Supplementary Requirement S1)
    • ASTM B574 - nickel alloy rod (raw material for nickel alloy nuts, 4.1.1)
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