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    2. Grade R58640

    ASTM F468/F468M Grade R58640 19 Titanium Ti-38-6-44 Fasteners

    High quality ASTM F468 Titanium Ti-38-6-44 fasteners manufactured for industrial and corrosion resistant applications.

    ASTM F468/F468M Grade R58640 Titanium Ti-38-6-44 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 R58640 19 Titanium Ti-38-6-44 3.0-
    4.0     		0.05 0.30 balance 0.0200 0.03 0.12 0.10 D 7.5-
    8.5     		5.5-
    6.5     		3.5-
    4.5     		3.5-
    4.5     		. . . . . . 0.10 D 0.15 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 19 F468FT All 24-38 HRC 115-150 115 120 115 15
    • (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 R58640 19 Titanium Ti-38-6-44 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 R58640 19 Titanium Ti-38-6-44 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 ASTM F468 titanium grade 19 (R58640)?

    UNS R58640 is F468 titanium grade 19, general name Titanium Ti-38-6-44 (Table 1). Chemical requirements: vanadium 7.5-8.5 %, chromium 5.5-6.5 %, molybdenum 3.5-4.5 %, zirconium 3.5-4.5 %, aluminum 3.0-4.0 %, iron 0.30 % max, oxygen 0.12 % max, titanium balance. Titanium fasteners are furnished as formed (4.2.2).

    What are the mechanical properties of F468 titanium grade 19?

    Full-size tensile 115-150 ksi and yield 115 ksi min; machined specimen tensile 120 ksi min, yield 115 ksi min, elongation 15 % min in 4D; hardness 24-38 HRC (Table 2). Hardness for titanium is for information only (Table 2 note A). Titanium is furnished as formed (4.2.2). Full-size test properties apply to fasteners up to 76 mm diameter; larger sections are negotiated (Table 2 note G).

    How are F468 titanium grade 19 fasteners marked?

    With the manufacturer's identification symbol and the Table 2 alloy/mechanical property marking F468FT, raised or depressed (16.1). Nuts for use with F468 bolts, cap screws and studs are covered by ASTM F467 (1.2).

    Can palladium or ruthenium be added to Grade 19?

    Yes. Ruthenium, palladium or both may be added to Grade 19 for enhanced corrosion resistance as negotiated between purchaser and vendor; chemical analysis for them is not required unless the purchaser asks (Table 1 note D).

    Does ASTM F468 cover sour service (NACE MR0175)?

    No. ASTM F468 is a specification for general use (1.1) and sets no sour-service limits. Where NACE MR0175 / ISO 15156 is required, state it on the purchase order as an additional requirement (3.1.8).

    References & Standards

    • ASTM F468 / F468M - Standard Specification for Nonferrous Bolts, Hex Cap Screws, Socket Head Cap Screws, and Studs for General Use (F468 inch, F468M metric)
    • ASTM F467 / F467M - Companion specification for Nonferrous Nuts (mate with F468 for matched-alloy assemblies)
    • ASTM F436 / F436M - Hardened steel washers (not referenced by F468)
    • NACE MR0175 / ISO 15156 - Sour-service materials for oil and gas production (not referenced by F468; specify on the order when required)
    • ASME B18.2.1 (bolts, hex cap screws) and ASME B18.3 (socket head cap screws) - dimensional standards referenced by F468 (7.1); ASME B1.1 and B1.3 for threads (7.3)
    • DIN 912 / 933 / 931 - Metric hex socket head and hex head cap screw dimensional standards
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