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    2. ASTM F467 Grade R50250

    ASTM F467/F467M Grade R50250 Alloy 1 Nuts Specification

    Lightweight titanium nuts engineered for corrosion-resistant applications.

    ASTM F467/F467M Grade R50250 Alloy 1 Nuts deliver excellent ductility, corrosion resistance, and durability for industrial and marine applications.

    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 R50250 1 Titanium Gr 1 . . . 0.10 0.20 balance 0.0125 0.05 0.18 . . . . . . . . . . . . . . . . . . . . . . . . 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 1 F 467AT 140 HV 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 Ti 1 F467MAT 140 HV 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/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 1 (R50250)?

    Grade 1 is the softest, most ductile commercially-pure titanium per ASTM F467 (oxygen 0.18% max, iron 0.20% max). Tensile 35 ksi min, yield 25 ksi min, elongation 24% min. Used for nonferrous nut where formability matters more than strength - heat exchanger tube-sheet bolts, deep-drawn fastener heads, and chemical service requiring titanium's intrinsic corrosion resistance.

    How does Grade 1 titanium compare to Grade 2?

    Grade 1 is ~30% weaker than Grade 2 but ~20% more ductile. Choose Grade 1 only when extreme formability is required - most general nonferrous nut goes to Grade 2 (R50400). Both share titanium's intrinsic resistance to seawater, chlorides, and oxidizing acids.

    Is Grade 1 titanium used in sour service?

    Rarely. Titanium is essentially immune to H2S sour-service attack across the F467 grade family, but the nut strength requirements for typical sour-service applications usually push designs to Grade 2 (R50400) or Grade 7 (R52400). Grade 1 is a niche choice.

    What dimensional patterns are available in Grade 1 bolting?

    Less common than Gr 2 or 5 but available on order across ASME B16 and B18 inch + metric series. TorqBolt cuts Grade 1 nut from PMI-verified bar stock with full F467 certification.

    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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