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    2. ASTM F467 Grade R50400

    ASTM F467/F467M Grade R50400 Alloy 2 Nuts Specification

    High-quality titanium alloy nuts for demanding industrial environments.

    ASTM F467/F467M Grade R50400 Alloy 2 Nuts are widely used for marine and chemical applications due to their superior corrosion resistance and lightweight properties.

    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 R50400 2 Titanium Gr 2 . . . 0.10 0.30 balance 0.0125 0.05 0.25 . . . . . . . . . . . . . . . . . . . . . . . . 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.

    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 2 F 467BT 150 HV 55 59
    • (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 Ti 2 F467MBT 150 HV 380
    • (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/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 2 (R50400)?

    Grade 2 is the workhorse commercially-pure titanium per ASTM F467 (oxygen 0.25% max, iron 0.30% max). Tensile 50 ksi min, yield 40 ksi min, elongation 20% min. Used across chemical-process, marine, desalination, and pharmaceutical nut where titanium's seawater + chloride + oxidizing-acid resistance is required at a moderate strength level.

    How does Grade 2 titanium resist seawater?

    Grade 2 forms a self-healing TiO2 passive film that gives essentially infinite life in clean seawater and oxygenated chloride brines. No measurable crevice corrosion below ~165 F. Above that or in deaerated brines, Grade 7 (Ti+Pd) is the safer choice. Pair with Grade 2 (titanium) bolts per ASTM F468 (companion bolt spec) for matched-alloy assemblies.

    Can Grade 2 titanium bolts be used in hot reducing acids?

    Limited. Pure Ti is acceptable in oxidizing acids (HNO3, dilute H2SO4 with dissolved O2) but corrodes rapidly in hot reducing HCl and sulfuric. For hot reducing-acid service, switch to Grade 7 (R52400 - Ti+Pd) which extends acceptable service substantially.

    What dimensional patterns are most common in Grade 2 bolting?

    ASME B16.5 full-thread flange studs (heat exchanger bolting), ASME B18.2.1 hex cap screws, ASME B18.3 socket head cap screws (heat exchanger plate frames), and ASME B18.31.3 threaded rods. Available across the full F467 inch + metric range.

    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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