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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/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 Inconel 625 (N06625)?

    Inconel 625 is a Ni-Cr-Mo-Nb solid-solution-strengthened alloy (~58 Ni, 20-23 Cr, 8-10 Mo, 3.15-4.15 Nb+Ta) with broad corrosion resistance across oxidizing + reducing media, excellent fatigue strength, and service to ~1800 F. Per ASTM F467 for nonferrous nut in seawater, sour-service, and high-temperature chemical equipment.

    How strong are Inconel 625 bolts per F467?

    In annealed condition: tensile 110 ksi min, yield 55 ksi min, elongation 30% min. In stress-relieved condition: tensile 135 ksi, yield 95 ksi. TorqBolt typically supplies F467 Inconel 625 nut in annealed condition for chemical-process service and in stress-relieved condition for high-strength applications.

    Is Inconel 625 NACE MR0175 acceptable for sour service?

    Yes. N06625 is listed in NACE MR0175 / ISO 15156 for downhole and surface nut in oil and gas H2S service per the standard's hardness and processing requirements.

    Where does Inconel 625 outperform Monel 400?

    Inconel 625 dominates Monel 400 in: high-temperature service (Monel limited to ~900 F creep, 625 useful to 1800 F), chloride pitting and crevice corrosion, oxidizing acids (Monel poor in HNO3, 625 excellent), and applications requiring 2x+ the proof load. Monel 400 wins on cost and clean-seawater simplicity.

    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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