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    2. ASTM F467 Grade N06625

    ASTM F467/F467M Grade N06625 Alloy 625 Nuts Specification

    Nickel alloy nuts engineered for extreme temperature and corrosion resistance.

    ASTM F467/F467M Grade N06625 Alloy 625 Nuts provide exceptional strength and oxidation resistance for aerospace, marine, oil & gas, and chemical processing industries.

    ASTM F467/F467M Chemical Composition

    ASTM F467/F467M Nickel and Nickel-Base Alloys

    UNS Designation Number Alloy General Name Al C, max Cr Cu A Fe, max Mn, max Ni A P, max Si, max Ti Co, max Mo S, max V W Cb †
    ASTM F467/F467M Grade N06625 625C Ni-Cr-Mo-Cb 0.40 max 0.10 20.0- 23.0 . . . 5.0 max 0.50 58.0 min 0.015 0.50 max 0.40 max 1.00 max 8.0- 10.0 0.015 . . . . . . 3.2- 4.2
    • (A) Elements shown as balance shall be arithmetically computed by deducting the sum of the other named elements from 100.
    • (B) Cobalt is to be counted as nickel.
    • (C) Alloy 625 material shall be refined using the electroslag remelting process (ESR), or the vacuum arc remelting process (VAR).

    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 Ni 625 Grade 1 F 467AC 85 HRB-35 HRC 60 65
    ASTM F467 Alloy Ni 625 Grade 2‡ F 467AD 85 HRB-35 HRC 120 130
    • (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 Ni 625 F 467AC 85 HRB-35 HRC 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 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 625 (UNS N06625)?

    UNS N06625 is alloy 625, listed in Table 1 of ASTM F467-13ε2 as Ni-Cr-Mo-Cb. Key composition limits: nickel 58.0 % min, chromium 20.0-23.0 %, molybdenum 8.0-10.0 %, columbium (niobium) 3.2-4.2 %, iron 5.0 % max. Alloy 625 nuts are furnished annealed (4.2.2). Alloy 625 material must be refined by electroslag remelting (ESR) or vacuum arc remelting (VAR) (Table 1, note C). Nickel alloy raw material is covered by ASTM B574 (4.1.1).

    What hardness and proof stress do F467 alloy 625 nuts need?

    Table 2 lists 2 strength grades for alloy 625. Grade 1: 85 HRB to 35 HRC min, 60 ksi hex, 65 ksi heavy hex, marking F 467AC; Grade 2: 85 HRB to 35 HRC min, 120 ksi hex, 130 ksi heavy hex, marking F 467AD. Heavy hex values are 1.08 times the hex nut value (note B). 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 625 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, giving: Grade 1 8,514 lbf hex, 9,224 lbf heavy hex; Grade 2 17,028 lbf hex, 18,447 lbf heavy hex.

    How are F467 alloy 625 nuts marked and supplied?

    Each nut carries the manufacturer's symbol and the Table 2 marking F 467AC / F 467AD, 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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