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    2. Grade 7G Nuts

    ASTM A194 Grade 7G Heavy Hex Nuts

    Alloy steel heavy hex nuts for critical bolting and pressure system applications.

    ASTM A194/A194M Grade 7G Nuts are manufactured from alloy steel materials for enhanced strength and durability in industrial fastening systems. These nuts are commonly used in process piping, pressure equipment, and structural bolting assemblies. They are often combined with ASTM A193/A193M alloy steel stud bolts and ASTM A320/A320M fasteners for temperature-controlled service conditions. ASTM A563M and ASTM F2437/F2437M specifications are also referenced in engineered fastening and industrial infrastructure projects.

    ASTM A194/A194M Gr 7G Chemical Requirements

    Grade Description
    and
    UNS Designation    		 C Mn P SE Si Cr Mo
    ASTM A194/A194M Grade 7G Cr - MoG 0.38-0.48 0.75-1.0 0.035 0.04 0.15-0.35 0.80-1.10 0.15-0.25
    • (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 7G Proof Load Requirements (Inch Series)

    Nominal Size, in. Threads per Inch Stress Area in. 2 Proof Load, lbf A
    Grades 2H, 3, 7, 16, 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 7G Proof Load Requirements (Metric Series)

    Nominal Size, mm Threads Pitch Stress Area mm 2 Proof Load, kNA
    Grades 2H, 3, 7, 16, 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

    Grade 7G is a Cr-Mo alloy A194 nut variant. The standard Cr-Mo grades are Grade 7 (paired with A193 B7 stud bolts) and Grade 7MG (sour-service variant). For 5Cr-0.5Mo service see Grade 3. For carbon-steel standard service use Grade 2H. Dimensions: ASME B18.2.2 heavy hex. Full specification: ASTM A194 PDF. A194 hub.

    International Equivalents

    StandardRegionNotes
    ASTM A193 B7 (companion)USAStandard A193 Cr-Mo stud bolt pairing
    BS EN 10269 (alloy)EUEuropean alloy steel bolting standard
    DIN 17240 (Q&T alloy)GermanyQuenched & tempered alloy nut
    ISO 898-2 Class 12ISOProperty class 12 high-strength metric
    JIS B 1051 (alloy)JapanJapanese alloy steel nut
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