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  Technical Information Listed Below 

Grade Markings for Carbon Steel Bolts

Bolt Head Styles

Fastener Drives

Head Identifications

Decimal Equivalents

Pipe Threads

Sheet Metal Gauge Thicknesses

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Grade Markings: Carbon Steel Bolts
Head markings for popular grades of carbon steel externally threaded fasteners


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Grade Identification Marking Specification Material Nominal Size
 (inch)
Proof Load Stress
 (ksi)
Tensile Strength
 (min psi)
Rockwell Hardness
 (min)
Rockwell Hardness
 (max)
See Note
SAE - Grade 1 SAE - Grade 1 ASTM A307 Low Carbon Steel 1/4 thru 1-1/2 - 60,000 B69 B100 -
SAE - Grade 1 ASTM A307 - Grade B Low or Medium Carbon Steel 1/4 thru 4 - 60,000 min
100,000 max
B69 B95 -
SAE J429- Grade 2 SAE J429 - Grade 2 Low or Medium Carbon Steel 1/4 thru 3/4 55,000 74,000 B80 B100 -
over 3/4 thru 1-1/2 33 60,000 B70 B100 -
SAE J429 - Grade 5 SAE - Grade 3 Medium Carbon Steel, Cold Worked 1/4 thru 1 85 100,000 B70 B100 -
SAE J429 - Grade 5 SAE J429 - Grade 5 Medium Carbon Steel, Quenched and Tempered 1/4 thru 1 85 120,000 C25 C34 -
ASTM A449 - Type 1 ASTM A449 - Type 1 Medium Carbon Steel, Quenched and Tempered over 1 thru 1-1/2 74 105,000 C19 C30 -
over 1-1/2 thru 3 55 90,000 183 235 3
ASTM A325 - Type 1 ASTM A325 - Type 1 Medium Carbon Steel, Quenched and Tempered 1/2 thru 1 85 120,000 C24 C35 4
over 1 to 1-1/2 74 105,000 C19 C31 4
ASTM A325 - Type 3 ASTM A325 - Type 3 Atmospheric Corrosion Resistant  Steel, Quenched and Tempered 1/2 thru 1 85 120,000 C24 C35 5
over 1 to 1-1/2 74 105,000 C19 C31 5
ASTM A354 - Grade BC ASTM A354 - Grade BC Medium Carbon Alloy Steel, Quenched and Tempered 1/4 thru 2-1/2 105 125,000 C26 C36 -
over 2-1/2  thru 4 95 115,000 C22 C33 -
SAE J429 - Grade 8 SAE J429 - Grade 8 Medium Carbon Alloy Steel, Quenched and Tempered 1/4 thru 1-1/2 120 150,000 C33 C39 -
ASTM A354 - Grade BD ASTM A354 - Grade BD Medium Carbon Alloy Steel, Quenched and Tempered

 

1/4 thru 2-1/2 120 150,000 C33 C39 6
over 2-1/2  thru 4 105,000 140,000 C31 C39 6
ASTM A490 - Type 1 ASTM A490 - Type 1 Medium Carbon Alloy Steel, Quenched and Tempered 1/2 thru 1-1/2 120 150,000 min
170,000 max
C33 C38 -
ASTM A490 - Type 3 ASTM A490 - Type 3 Atmospheric Corrosion Resistant  Steel, Quenched and Tempered 1/2 thru 1-1/2 120 150,000 min
170,000 max
C33 C38 5

NOTES:

  1. In addition to the the indicated grade marking, all grades included in this table must be marked for manufacturer identification.

  2. While hex heads are shown, grade markings apply equally to products with other head configurations.

  3. Brinell hardness numbers are shown for A490 Type 1 bolts over 1-1/2 inch thru 3 inch.

  4. A325 Type 1 bolts may also be marked with 3 radial lines 120° apart in addition to the A325 marking.

  5. The bolt manufacturer, at his option, may add other markings to indicate the use of atmospheric corrosion resistant material.

  6. A354 Grade BD products, in sizes 1-1/2 inch and smaller, are identified as shown and, at the manufacturer's option, may  have the letters BD added.  Larger sizes are marked only by BD.

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Bolt Head Styles

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Screw Drive Styles

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Fractional/Decimal/Millimeter Equivalents

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Pipe Threads

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Sheet Metal Gauge Conversions

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