Subject: Re: Bolt Grades

From: [email-masked] (John M. Peterson)
Date: 20 Jul 1993 14:31:52 -0400

Taken from  Machinery's Handbook 23 , pager 1286.

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ASTM and SAE Grade Markings for Steel Bolts and Screws
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Grade Marking           Spec.                Material 
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                        SAE - Grade 1        Low or Medium Carbon Steel
       No               ASTM - A 307         Low Carbon Steel
      Mark              SAE - Grade 2        Low or Medium Carbon Steel

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        |               SAE - Grade 5        Medium Carbon Steel
                                               Quenched and Tempered
                        ASTM - A 409 
     /     \

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        |               SAE - Grade 5.2      Low Carbon Martensite Steel
     \     /                                   Quenched and Tempered

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        |               ASTM - A 325         Medium Carbon Steel
                          Type 1               Quenched and Tempered
      A 325                                    Radial dashes optional 
     /     \

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        |               ASTM - A 325         Low Carbon Martensite Steel
     \     /              Type 2               Quenched and Tempered
      A 325

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                        ASTM - A 325         Atmospheric Corrosion (Weathering) 
                          Type 3               Steel, Quenched and Tempered
      A 325
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                        ASTM - A 354         Alloy Steel, 
                          Grade BC             Quenched and Tempered
       BC  

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        |               SAE - Grade 7        Medium Carbon Alloy Steel
     \     /                                   Quenched and Tempered,
                                               Roll Threaded After Heat
     /     \                                   Treatment

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        |               SAE - Grade 8        Medium Carbon Alloy Steel
     \     /                                   Quenched and Tempered 
                        ASTM - A 354         Alloy Steel,
     /     \              Grade BD             Quenched and Tempered 
        |   
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       \/               SAE - Grade 8.2      Low Carbon Martensite Steel
     \    /                                    Quenched and Tempered
    \      /

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                        ASTM - A 490         Alloy Steel, 
                          Type 1               Quenched and Tempered
      A 490  

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                        ASTM - A 490         Atmospheric Corrosion (Weathering) 
                          Type 3               Steel, Quenched and Tempered
      A 490
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