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    ASTM F468/F468M Grade R50250 1 Titanium Gr 1 Fasteners

    High quality ASTM F468 Titanium Gr 1 fasteners manufactured for industrial and corrosion resistant applications.

    ASTM F468/F468M Grade R50250 Titanium Gr 1 fasteners are manufactured in accordance with ASTM specifications for nonferrous bolts, hex cap screws, socket head cap screws, and studs.

    Chemical Requirements

    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
    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.
    • (C) Identical chemical requirements apply to both Class A and B as defined in Table 2 and 6.5.
    • (D) 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 required by the purchaser.

    Mechanical Requirements

    Alloy Mechanical Property Marking Nominal Thread Diameter, in. Hardness A Full-Size Tests B Machined Specimen Tests
    Tensile Strength, ksi Yield Strength, min, ksi C Tensile Strength, min, ksi Yield Strength min, ksi C Elongation in 4D, min, % D
    Alloy Ti 1 F468AT All 140-160 HV 35-70 30 35 25 24
    • (A) Where both tension and hardness tests are performed, the tension tests shall take precedence for acceptance purposes. For aluminum and titanium alloys, hardness tests are for information only. See 6.5.
    • (B) The yield and tensile strength values for full-size products shall be computed by dividing the yield and maximum tensile load by the stress area for the product diameter and thread pitch as given in table on tensile stress areas.
    • (C) Yield strength is the stress at which an offset of 0.2 % gage length occurs.
    • (D) Elongation is determined using a gage length of 4 diameters of test specimen in accordance with Test Methods E8/E8M.
    • (E) "HF" denotes a hot-formed product.
    • (F) Aluminum alloy temper designations are in accordance with ANSI H35.1.
    • (G) Full-size test mechanical properties apply to fasteners with a maximum diameter of 76 mm. Mechanical properties of larger sections shall be negotiated between the material manufacturer and the fastener producer.
    • (H) Ti 5 Class A requires wedge tensile testing in accordance with Ti 5 Class B requires wedge tensile testing in accordance.

    ASTM F468/F468M Grade R50250 1 Titanium Gr 1 Tensile Stress Areas and Threads(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 / 18 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 F468/F468M Grade R50250 1 Titanium Gr 1 Tensile Stress Areas (Metric)

    Nominal Product Diameter and Thread Pitch Stress Area, A mm 2 Nominal Product Diameter and Thread Pitch Stress Area, A mm 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:
    • A s = 0.7854 (D − 0.9382 P) 2
    • where:
    • As = stress area, mm2,
    • D  = nominal thread diameter, mm, and
    • P  = thread pitch, mm.

    Frequently Asked Questions

    What is Titanium Grade 1 (R50250)?

    Grade 1 is the softest, most ductile commercially-pure titanium per ASTM F468 (oxygen 0.18% max, iron 0.20% max). Tensile 35 ksi min, yield 25 ksi min, elongation 24% min. Used for nonferrous bolting 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 bolting 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 F468 grade family, but the bolting 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 bolting from PMI-verified bar stock with full F468 certification.

    References & Standards

    • ASTM F468 / F468M - Standard Specification for Nonferrous Bolts, Hex Cap Screws, and Studs for General Use
    • ASTM F467 / F467M - Companion specification for Nonferrous Nuts (mate with F468 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 B18.2.1 / B18.2.3 series / B18.3 / B18.6.7M / B18.31 / B16.5 - Dimensional standards referenced by F468
    • DIN 912 / 933 / 931 - Metric hex socket head and hex head cap screw dimensional standards
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