TOLERANCES
Industry-leading tolerances

Thanks to our tool-building and unique straightening capabilities, we are able to deliver remarkable standard and premium linear and geometric tolerances.

Standard tolerances are those which can be expected for production parts. Repeatability of all dimensions of the casting is assured. Premium tolerances are those which provide for tighter control of selected dimensions. As premium tolerances necessitate added operations, excessive use of these requirements in non-critical areas should be avoided to keep casting costs low.

LINEAR TOLERANCES

DIMENSIONS NORMAL TOLERANCES PREMIUM TOLERANCES
Inches Millimiters Inches Millimiters Inches Millimiters
up to 1" 25

±.005"

±.130

±.003"

±.075

up to 2" 50 ±.010" ±.255 ±.005" ±.130
up to 3" 75 ±.015" ±.380 ±.010" ±.255
up to 4" 100 ±.020" ±.508 ±.013" ±.330
up to 5" 130 ±.025" ±.635 ±.016" ±.406
up to 6" 150 ±.030" ±.762 ±.019" ±.482
up to 7" 180 ±.035" ±.889 ±.021" ±.533
up to 8" 205 ±.040" ±1.01 ±.023" ±.584
up to 9" 230 ±.045" ±1.14 ±.025" ±.635
up to 10" 255 ±.050" ±1.27 ±.027" ±.685
up to 11" 279 ±.055" ±1.39 ±.029" ±.736
up to 12" 304 ±.060" ±1.52 ±.031" ±.787
up to 13" 330 ±.065" ±1.65 ±.033" ±.838
up to 14" 355 ±.070" ±1.77 ±.035" ±.889
up to 15" 381 ±.075" ±1.90 ±.037" ±.939
up to 16" 406 ±.080" ±2.03 ±.039" ±.990
up to 17" 432 ±.085" ±2.15 ±.040" ±1.01
up to 18" 457 ±.090" ±2.28 ±.042" ±1.06
up to 19" 482 ±.095" ±2.41 ±.044" ±1.11
up to 20" 508 ±.100" ±2.54 ±.046" ±1.16
up to 21" 533 ±.105" ±2.66 ±.048" ±1.21
up to 22" 559 ±.110" ±2.79 ±.050" ±1.27
up to 23" 584 ±.115" ±2.92 ±.052" ±1.39
up to 24" 610 ±.120" ±3.04 ±.054" ±1.42

 

GEOMETRIC TOLERANCES

   

STANDARD TOLERANCES

PREMIUM TOLERANCES

ANGULARITY +1°

+.5°

STRAIGHTNESS Up to 2" 0.10 Up to 2" .006
2.1 - 5" 0.020 2.1 - 5" 0.012

FLATNESS 5.1 - 10" 0.040 5.1 - 10" 0.020
10.1 - 15" 0.060 10.1 - 15" 0.035

SQUARENESS Up to 2" 0.010 Up to 2" 0.005
2.1 - 5" 0.030 2.1 - 5" 0.010
5.1 - 10" 0.050 5.1 - 10" 0.018
10.1 - 15" 0.080 10.1 - 15" 0.035

PARALLELISM Up to 2" 0.010 Up to 2" 0.005
2.1 - 5" 0.030 2.1 - 5" 0.010
5.1 - 10" 0.050 5.1 - 10" 0.018
10.1 - 15" 0.080 10.1 - 15" 0.035

PROFILE Should be equal to double the linear tolerance being allowed.  (See Linear Tolerance Table )
  HOLES See General Linear Tolerances

 

 
 
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