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    2. Grade 43 Nuts

    ASTM A194 Grade 43 Heavy Hex Nuts

    Durable heavy hex nuts for industrial and pressure bolting systems.

    ASTM A194/A194M Grade 43 Nuts are manufactured for reliable fastening performance in industrial piping and pressure applications. These heavy hex nuts offer dependable mechanical strength and durability in refinery and fabrication projects. They are commonly used with ASTM A193/A193M stud bolts, ASTM A320/A320M low-temperature bolting systems, ASTM A563M structural fasteners, and ASTM F2437/F2437M engineered fastening applications.

    ASTM A194/A194M Gr 43 Chemical Requirements

    Grade Description
    and
    UNS Designation    		 C Mn P SE Si Cr Ni Mo
    ASTM A194/A194M Grade 43 Ni-Cr-Mo 0.38–0.43 0.60–0.85 0.035 0.04 0.15–0.35 0.70–0.90 1.65–2.0 0.20–0.30
    • (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 Gr 43 Hardness Requirements

    Grade and Type Completed Nuts Sample Nut after Treatment
    Brinell Hardness Rockwell Hardness Brinell Hardness, min Rockwell Hardness B Scale, min
    C Scale
    ASTM A194/A194M Grade 43 248 to 327 24 to 35 201 94

    ASTM A194/A194M Gr 43 Proof Load Requirements (Inch Series)

    Nominal Size, in. Threads per Inch Stress Area in. 2 Proof Load, lbf A
    Grade 43
    Heavy HexF HexG
    1/4 20 0.0316 5 570 4 770
    5/16 18 0.0524 9 170 7 860
    3/8 16 0.0774 13 560 11 620
    7/16 14 0.1063 18 600 15 940
    1/2 13 0.1419 24 830 21 280
    9/16 12 0.182 31 850 27 300
    5/8 11 0.226 39 550 33 900
    3/4 10 0.334 58 450 50 100
    7/8 9 0.462 80 850 69 300
    1 8 0.606 106 000 90 900
    11/8 8 0.790 138 200 118 500
    11/4 8 1.000 175 000 150 000
    13/8 8 1.233 215 800 185 000
    11/2 8 1.492 261 100 223 800
    • (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 Gr 43 Proof Load Requirements (Metric Series)

    Nominal Size, mm Threads Pitch Stress Area mm 2 Proof Load, kNA
    Grade 43
    Heavy HexF HexG
    M6 1.0 20.1 29.2 20.8
    M8 1.25 36.6 44.1 37.9
    M10 1.50 58.0 69.9 60.0
    M12 1.75 84.3 101.6 87.3
    M14 2.0 115.0 138.6 119.0
    M16 2.0 157.0 189.2 162.5
    M20 2.5 245.0 295.2 253.6
    M22 2.5 303.0 365.1 313.6
    M24 3.0 353.0 425.4 365.4
    M27 3.0 459.0 553.4 475.1
    M30 3.5 561.0 676.0 580.6
    M36 4.0 817.0 984.5 845.6
    • (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 43 belongs to the carbon family. Related grades: Grade 1, Grade 2, Grade 2H, Grade 2HM, Grade 16. Dimensions: ASME B18.2.2 heavy hex. Full standard: ASTM A194 PDF. A194 hub.

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