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    2. Grade 9C Nuts

    ASTM A194 Grade 9C Heavy Hex Nuts — UNS N08367

    High-alloy heavy hex nuts for severe chemical and corrosive applications.

    ASTM A194/A194M Grade 9C Nuts are designed for exceptional resistance to sulfuric acid, chlorides, and aggressive chemical environments. These heavy hex nuts are widely used in chemical processing, marine, and pollution control systems. Grade 9C nuts are commonly used with ASTM A193/A193M corrosion-resistant stud bolts and ASTM A320/A320M low-temperature bolting assemblies. ASTM A563M and ASTM F2437/F2437M specifications are also referenced in engineered fastening and industrial infrastructure applications.

    ASTM A194/A194M Grade 9C Chemical Requirements

    Grade Description
    and
    UNS Designation    		 C Mn P SE Si Cr Ni Mo N Cu
    ASTM A194/A194M Grade 9C (AL-6XN) N08367 0.030 2.00 0.040 0.030 1.00 20.0-22.0 23.5- 25.5 6.0-7.0 0.18-0.25 0.75
    • (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 9C Hardness Requirements

    Grade and Type Completed Nuts
    Brinell Hardness Rockwell Hardness
    C Scale B Scale
    ASTM A194/A194M Grade 9C 126 to 300 32 max 60 min

    ASTM A194/A194M Grade 9C Proof Load Requirements (Inch Series)

    Nominal Size, in. Threads per Inch Stress Area in. 2 Proof Load, lbf A
    Grade 9C
    Heavy HexH HexI
    1/4 20 0.0316 2 540 2 380
    5/16 18 0.0524 4 190 3 930
    3/8 16 0.0774 6 200 5 810
    7/16 14 0.1063 8 500 7 970
    1/2 13 0.1419 11 350 10 640
    9/16 12 0.182 14 560 13 650
    5/8 11 0.226 18 080 16 950
    3/4 10 0.334 26 720 25 050
    7/8 9 0.462 36 960 34 650
    1 8 0.606 48 480 45 450
    11/8 8 0.790 63 200 59 250
    11/4 8 1.000 80 000 75 000
    13/8 8 1.233 98 640 92 450
    11/2 8 1.492 119 360 111 900
    • (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 9C Proof Load Requirements (Metric Series)

    Nominal Size, mm Threads Pitch Stress Area mm 2 Proof Load, kNA
    Grade 9C
    Heavy HexH HexI
    M6 1.0 20.1 11.1 10.4
    M8 1.25 36.6 20.1 18.8
    M10 1.50 58.0 31.9 29.9
    M12 1.75 84.3 46.4 43.4
    M14 2.0 115.0 63.3 59.2
    M16 2.0 157.0 86.4 80.9
    M20 2.5 245.0 134.8 126.2
    M22 2.5 303.0 166.7 156.0
    M24 3.0 353.0 194.2 181.8
    M27 3.0 459.0 252.5 236.4
    M30 3.5 561.0 308.6 288.9
    M36 4.0 817.0 449.4 420.8
    • (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 9C (UNS N08367) belongs to the austenitic family. Related grades: Grade 8, Grade 8M, Grade 8MA, Grade 8C, Grade 8T. Dimensions: ASME B18.2.2 heavy hex. Full standard: ASTM A194 PDF. A194 hub.

    International Equivalents

    StandardRegionNotes
    ASTM B564 N08367 forgingUSAAL-6XN forged flange standard
    ASTM B675 N08367 tubeUSAAL-6XN seamless tube alloy
    UNS N08367 = AL-6XNUSAAllegheny Ludlum trade name
    EN 1.4547 (super-austenitic)EUEuropean super-austenitic 6Mo-N
    DIN X1CrNiMoCuN20-18-7GermanyMaterial number 1.4547
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