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    2. Grade 6F Nuts

    ASTM A194 Grade 6F Heavy Hex Nuts — UNS S41623

    Industrial stainless steel heavy hex nuts with dependable corrosion resistance.

    ASTM A194/A194M Grade 6F Nuts are widely used in industrial fastening systems where corrosion resistance and mechanical reliability are essential. These heavy hex nuts are suitable for refinery piping, valve systems, and fabrication applications. They are commonly paired with ASTM A193/A193M stud bolts, ASTM A320/A320M low-temperature fasteners, ASTM A563M structural bolting, and ASTM F2437/F2437M fastening assemblies.

    ASTM A194/A194M Grade 6F Chemical Requirements

    Grade Description
    and
    UNS Designation    		 C Mn P SE Si Cr Se
    ASTM A194/A194M Grade 6F (416Se) S41623 0.15 1.25 0.060 0.060 1.00 12.0-14.0 0.15 min
    • (A) Total aluminum, soluble and insoluble.
    • (B) Maximum, unless minimum or range is indicated.
    • (C) Where ellipses (...) appear in this table there is no requirement.

    ASTM A194/A194M Grade 6F Hardness Requirements

    Grade and Type Completed Nuts
    Brinell Hardness Rockwell Hardness
    C Scale
    ASTM A194/A194M Grade 6F 228 to 271 20 to 28

    ASTM A194/A194M Grade 6F Proof Load Requirements (Inch Series)

    Nominal Size, in. Threads per Inch Stress Area in. 2 Proof Load, lbf A
    Grade 6F
    Heavy HexD HexE
    1/4 20 0.0316 4 770 4 300
    5/16 18 0.0524 7 860 7 070
    3/8 16 0.0774 11 620 10 460
    7/16 14 0.1063 15 940 14 350
    1/2 13 0.1419 21 280 19 160
    9/16 12 0.182 27 300 24 570
    5/8 11 0.226 33 900 30 510
    3/4 10 0.334 50 100 45 090
    7/8 9 0.462 69 300 62 370
    1 8 0.606 90 900 81 810
    11/8 8 0.790 118 500 106 700
    11/4 8 1.000 150 000 135 000
    13/8 8 1.233 185 000 166 500
    11/2 8 1.492 223 800 201 400
    • (A) See limit for proof load test in 8.2.2.1. The proof load for jam nuts shall be 46 % of the tabulated load.
    • (B) Based on proof stress of 130 000 psi.
    • (C) Based on proof stress of 120 000 psi.
    • (D) Based on proof stress of 150 000 psi.
    • (E) Based on proof stress of 135 000 psi.
    • (F) Based on proof stress of 175 000 psi.
    • (G) Based on proof stress of 150 000 psi.
    • (H) Based on proof stress of 80 000 psi.
    • (I) Based on proof stress of 75 000 psi.

    ASTM A194/A194M Grade 6F Proof Load Requirements (Metric Series)

    Nominal Size, mm Threads Pitch Stress Area mm 2 Proof Load, kNA
    Grade 6F
    Heavy HexD HexE
    M6 1.0 20.1 20.8 18.7
    M8 1.25 36.6 37.9 34.0
    M10 1.50 58.0 60.0 53.9
    M12 1.75 84.3 87.3 78.4
    M14 2.0 115.0 119.0 107.0
    M16 2.0 157.0 162.5 146.0
    M20 2.5 245.0 253.6 227.8
    M22 2.5 303.0 313.6 281.8
    M24 3.0 353.0 365.4 328.3
    M27 3.0 459.0 475.1 426.9
    M30 3.5 561.0 580.6 521.7
    M36 4.0 817.0 845.6 759.8
    • (A) See limit for proof load test in 8.2.2.1. The proof load for jam nuts shall be 46 % of the tabulated load.
    • (B) Based on proof stress of 895 MPa.
    • (C) Based on proof stress of 825 MPa.
    • (D) Based on proof stress of 1035 MPa.
    • (E) Based on proof stress of 930 MPa.
    • (F) Based on proof stress of 1205 MPa.
    • (G) Based on proof stress of 1035 MPa.
    • (H) Based on proof stress of 550 MPa.
    • (I) Based on proof stress of 515 MPa.

    Related A194 Grades & References

    ASTM A194 Grade 6F (UNS S41623) belongs to the martensitic family. Related grades: Grade 6, Grade 2H, Grade 8. Dimensions: ASME B18.2.2 heavy hex. Full standard: ASTM A194 PDF. A194 hub.

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