Bolt identification 101

Discussion in '80-Series Tech' started by silverhorse, Aug 13, 2010.

  1. silverhorse

    silverhorse

    Joined:
    Feb 7, 2009
    Messages:
    829
    Location:
    Pensacola, Fl.
    I thought it might be a good idea to post up some info on bolt hardness. This may come in handy for those just getting into fab work or suspension upgrades. I always use grade 8 hardware AND LOCKING NUTS whenever doing anything on the chassis or suspension.

    Bolt Head Marking Chart
    Identification
    Grade Mark
    Specifications Material Normal Size
    Dia. In
    Proof Load
    PSI
    (Mpa)
    Tensile Strength
    Min. PSI
    (Mpa)
    Yield Strength
    Min. PSI
    Bolt Rockwell
    Hardness
    Nut Rockwell
    Hardness
    Min Max Min Max [​IMG] SAE J429
    Grade 1
    Low Carbon Steel 1/4" - 1 1/4" 33.000 60.000 36,000 B70 B100 SAE J429
    Grade 2
    1/4 " - 3/4"
    3/4" - 1 1/2"
    55.000
    33.000
    60.000
    74.000
    57.000
    36.000
    B80 B100 C32 [​IMG] Property
    Class 5.8
    Low or Medium
    Carbon Steel
    M5 - M24 55.100
    (380)
    75.400
    (520)
    B82 B95 C32 [​IMG] SAE J429
    Grade 5
    Medium Carbon Steel, Quenched and Tempered 1/4 - 1
    1" - 1-1/2"
    85,000
    74,000
    120,000
    105,000
    92,000
    81,000
    C25
    C19
    C34
    C30
    C32 ASTM A449 1/4" - 1"
    1" - 1-1/2
    1-1/2" - 3"
    85,000
    74,000
    55,000
    120,000
    105,000
    90,000
    92,000
    81,000
    58,000
    [​IMG] SAE J429
    Grade 5.1
    Low or Medium Carbon Steel, Quenched and Tempered No. 6
    thru 3/8
    85,000 120,000 C25 C40 [​IMG] SAE J429
    Grade 5.2
    Low Carbon Martensitic Steel, Quenched and Tempered 1/4 thru 1 85,000 120,000 92,000 [​IMG] ASTM A325
    Type 1
    Medium Carbon Steel, Quenched and Tempered 1/2 thru 1
    1-1/8 thru 1-1/2
    85,000
    74,000
    120,000
    105,000
    92,000
    81,000
    [​IMG]
    A325
    ASTM A325
    Type 2
    Low Carbon Martensitic Steel, Quenched and Tempered 1/2 thru 1 85,000 120,000 92,000 [​IMG]
    A325
    ASTM A325
    Type 3
    Atmospheric Corrosion Resisting Steel, Quenched and Tempered 1/2 thru 1
    1-1/8 thru 1-1/2
    85,000
    74,000
    120,000
    105,000
    92,000
    81,000
    Identification
    Grade Mark
    Specifications Material Normal Size
    Dia. In
    Proof Load
    PSI
    (Mpa)
    Tensile Strength
    Min. PSI
    (Mpa)
    Yield Strength
    Min. PSI
    Bolt Rockwell
    Hardness
    Nut Rockwell
    Hardness
    Min Max Min Max [​IMG]
    BB
    ASTM A354
    Grade BB
    Alloy Steel, Quenched and Tempered 1/4 thru 2-1/2
    2-3/4 thru 4
    80,000
    75,000
    105,000
    100,000
    83,000
    78,000
    [​IMG]
    BC
    ASTM A354
    Grade BC
    105,000
    95,000
    125,000
    115,000
    109,000
    99,000
    [​IMG] Property
    Class 9.8
    Medium carbon steel, Quenched & tempered M1.6 - M16 94.250
    (650)
    130.500
    (900)
    C27 C36 C32 [​IMG] SAE J429
    Grade 7
    Medium Carbon Alloy Steel, Quenched and Tempered 1/4 thru 1-1/2 105,000 133,000 115,000 [​IMG] SAE J429
    Grade 8
    Medium Carbon Alloy Steel, Quenched and Tempered 1/4 thru 1-1/2 120,000 150,000 130,000 ASTM A354
    Grade BD
    Alloy Steel, Quenched and Tempered [​IMG]
    No Grade
    Mark
    SAE J429
    Grade 8.1
    Medium Carbon Alloy or SAE 1041 Modified Elevated Temperature Drawn Steel 1/4 thru 1-1/2 120,000 150,000 130,000 [​IMG] SAE
    Grade 8.2
    Low carbon boron martensite steel
    fully killed fine grain quenched & tempered
    1/4" - 1" 120.000 150.000 C35 C42 Identification
    Grade Mark
    Specifications Material Normal Size
    Dia. In
    Proof Load
    PSI
    (Mpa)
    Tensile Strength
    Min. PSI
    (Mpa)
    Yield Strength
    Min. PSI
    Bolt Rockwell
    Hardness
    Nut Rockwell
    Hardness
    Min Max Min Max [​IMG]
    A490
    ASTM A490 Alloy Steel, Quenched and Tempered 1/2 thru 1-1/2 120,000 150,000 min
    170,000 max
    130,000 [​IMG]
    No Grade
    Mark
    ISO R898
    Class 4.6
    Medium Carbon Steel, Quenched and Tempered All Sizes

    thru 1-1/2
    120,000 150,000 130,000 [​IMG] Property
    Class 10.9
    Medium carbon alloy steel
    quenched & tempered
    M6 - M36 120.350
    (830)
    150.800
    (1040)
    C33 C39 C26 C36 [​IMG] Property
    Class 12.9
    Medium carbon alloy steel
    quenched & tempered
    M1.6 - M36 140.000
    (970)
    176.900
    (1220)
    C38 C44 C26 C36
    Mechanical
     

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