PETROCHEMICAL
STUDBOLTS
Finished studbolts and studbolt assemblies are available from stock in both Imperial and Metric threads and in a range of different finishes. Our studbolts are widely used in the Petrochemical industry and are covered in the ASTM standards A193 for high temperature or high pressure service, and A320 for low temperature service. A selection of the most commonly used studbolt materials are listed in the table below. For the full list of materials available please see our materials section above.
GRADE
MATERIAL DESCRIPTION
IMPERIAL - ANSI B16.5
DIAMETER (D)
TPI (UNC)
TPI (UNS)
DIAMETER (D)
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The length (L), measured parallel to the axis, is the distance from first thread to first thread
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End points are flat and chamfered both ends
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Length of point on studbolts shall be not less than one nor more than two complete threads as measured from the extreme end parallel to the axis
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Threads are UNC for all studbolt diameters 1” and smaller
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Threads are UNS for all studbolt diameters 1.1/8” and above. These can be supplied as UNC but are non-standard.
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Threads are Class 2A for all studbolts in accordance with ASME B1.1
METRIC - DIN976
DIAMETER (D)
THREAD PITCH
DIAMETER (D)
THREAD PITCH
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The length (L), measured parallel to the axis, is the distance from end to end
-
End points are flat and chamfered both ends
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Length of point on studbolts shall be not less than one nor more than two complete threads as measured from the extreme end parallel to the axis
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Threads are accordance with ISO 261
