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a square bar type restorer with 8 different land, where a dir cannot be used ,a few easy passes with the appropriate land of the restorer over the damaged face of the bolt or a pipe will restore the thread without reducing the diameter, as only the displaced metal is removed, the original fit is preserved.
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No.
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thread
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Thread size on each restorer
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1
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Metric
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0.75 ,1.00,1.25,1.50,1.75,2.00,2.50,3.00
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2
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PF,BSP
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11,12,14,16,19,20,22,28
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3
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SAE,UN
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12,13,14,16,18,20,24,28
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4
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BSW,BSF
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11,12,14,16,18,20,22,26
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