Machining Allowances
  Minimum OD and ID stock allowances for the removal of inside surface imperfections*
  Outside
Diameter,
Inches 		Wall Thickness, Inches
  Up to
.125 		  Over .125
to .188 		  Over .188
to .250 		  Over .250
to .375 		  Over .375
to .500
  Up to 3     .012     .014     .017     .020     .021  
  Over 3 to 4     .014     .017     .020     .021     .025  
  Over 4 to 6     .020     .021     .025     .028     .030  
  Over 6 to 8          .025     .028     .030     .032  
  Over 8 to 10.750                    .034     .035  

 

For steel grades with over 0.29% carbon, a minimum of 0.015" stock is required for removal of decarburization.

* Allowances are not intended to cover sub-surface steel imperfections such as non-metallic inclusions.

 


  Centerless Grinding Allowances
  Minimum OD stock allowances for the removal of inside surface imperfections*
  Outside
Diameter,
Inches 		Wall Thickness, Inches
  Up to
.125 		  Over .125
to .180 		  Over .180
to .230 		  Over .230
to .360 		  Over .360
to .460 		  Over
.460
  Up to 3 Incl     .012     .014     .016     .020     .024     .026  
  Over 3 to 4-3/4 Incl     .016     .018     .020     .022     .024     .026  
  Over 4-3/4 to 6 Incl     .018     .020     .022     .024     .026     .028  
  Over 6 to 7 Incl     .020     .022     .024     .026     .028     .030  
  Over 7 to 8 Incl               .026     .027     .029     .031  
  Over 8               .027     .028     .030     .032  

 

For steel grades with over 0.29% carbon, a minimum of 0.015" stock is required for removal of decarburization.

* Allowances are not intended to cover sub-surface steel imperfections such as non-metallic inclusions.

 


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