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Engineer’s Parallels Data

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Dimensions (mm)Units 0.001mm
Grade B
Caliper measurements for individual parallels
Functional Requirements
IndividualPairs
Thickness TWidth WLengthLDeparture from Nominal T & WVariation in Caliper Measurements of T & WParallelism of T & WMatching
510100±104812
1020125±104812
1530150±104812
2040200±104812
2550250±2061220
3060300±2061220
Dimensions (inches)Units 0.000 1inch
Grade B
Maximum Permissible Errors for Each ParallelA pair of Parallels shall have equal Thickness (T) and Width (W) to within
Thickness TWidth WLengthL (Minimum)Tolerance on T&WVariations in T&W Not to ExceedError in Straightness within
¼½4±2.51±1.01
¾6±2.51.5±1.51.5
½16±2.51.5±1.51.5
¾8±4.02±2.02
1210±4.02.5±2.52.5
10±5.02.5±2.52.5
312±5.03±3.03


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