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    2. ASTM F467 Grade R50700

    ASTM F467/F467M Grade R50700 Alloy 4 Nuts Specification

    Commercially pure titanium nuts for industrial and marine applications.

    ASTM F467/F467M Grade R50700 Alloy 4 Nuts provide high tensile strength, excellent corrosion resistance, and outstanding durability in critical operating conditions.

    ASTM F467/F467M Chemical Composition

    ASTM F467/F467M Titanium and Titanium-Base Alloys A

    UNS Designation Number Alloy General Name Al C Fe Ti H N O Pd V Cr Mo Zr Sn Si Ru Residuals B
    each, max total, max
    ASTM F467/F467M Grade R50700 4 Titanium Gr 4 . . . 0.10 0.50 balance 0.0125 0.07 0.40 . . . . . . . . . . . . . . . . . . . . . . . . 0.1 0.4
    • (A) All reported values are maximums, unless a range is specified.
    • (B) A residual is an element present in a metal or an alloy in small quantities inherent to the manufacturing process but not added intentionally. Residual elements need not be reported unless a report is specifically required by the purchaser.
    • (C) Ruthenium and Palladium, or both, may be added to Grade 19 for enhanced corrosion resistance as negotiated between purchaser and vendor. Chemical analysis is not required unless specifically negotiated.

    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 Ti 4 F 467CT 200 HV 85 92
    • (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.
    • (C) Aluminum alloy 2024-T4 shall be supplied in naturally aged condition. This material is not recommended for nuts in sizes greater than 1/4 (0.250) in.

    ASTM F467M Mechanical Requirements (Metric)

    Alloy Mechanical Property Marking Hardness, min A Proof Stress, Mpa
    ASTM F467M Ti 4 F467MCT 200 HV 585
    • (A) For aluminum and titanium alloys hardness values are for information only.
    • (B) Aluminum alloy 2024-T4 shall be supplied in naturally aged condition. This material is not recommended for nuts in nominal thread diameter larger than M6.

    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 Titanium Grade 4 (R50700)?

    Grade 4 is the strongest commercially-pure titanium per ASTM F467 (oxygen 0.40% max). Tensile 80 ksi min, yield 70 ksi min, elongation 15% min. Used where high CP-titanium strength is needed - aerospace airframe brackets, high-pressure heat exchanger bolting, and dental + medical applications.

    How does Grade 4 compare to Grade 5 (Ti-6Al-4V)?

    Grade 4 is unalloyed (Ti only) so it retains the full corrosion resistance of CP titanium with about 70% the strength of Grade 5. Grade 5 adds aluminum + vanadium for an additional 30% tensile / 60% yield strength at the cost of slightly more crevice + chloride sensitivity. Choose Gr 4 for corrosion-critical applications, Gr 5 for strength-critical.

    Sour-service acceptance?

    Yes - all titanium grades are NACE MR0175-listed with normal acceptance criteria.

    Where is Grade 4 used in F467 nut applications?

    Aerospace structural fasteners, high-pressure plate heat-exchanger nut (Grade 4 plates need Grade 4 bolts to avoid galvanic mismatch), and specialty chemical-process applications requiring CP-Ti corrosion with higher strength.

    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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