Engineer’s Parallels Data
Back to Data SheetsDimensions (mm) | Units 0.001mm | |||||
Grade B | ||||||
Caliper measurements for individual parallels | Functional Requirements | |||||
Individual | Pairs | |||||
Thickness T | Width W | LengthL | Departure from Nominal T & W | Variation in Caliper Measurements of T & W | Parallelism of T & W | Matching |
5 | 10 | 100 | ±10 | 4 | 8 | 12 |
10 | 20 | 125 | ±10 | 4 | 8 | 12 |
15 | 30 | 150 | ±10 | 4 | 8 | 12 |
20 | 40 | 200 | ±10 | 4 | 8 | 12 |
25 | 50 | 250 | ±20 | 6 | 12 | 20 |
30 | 60 | 300 | ±20 | 6 | 12 | 20 |
Dimensions (inches) | Units 0.000 1inch | |||||
Grade B | ||||||
Maximum Permissible Errors for Each Parallel | A pair of Parallels shall have equal Thickness (T) and Width (W) to within | |||||
Thickness T | Width W | LengthL (Minimum) | Tolerance on T&W | Variations in T&W Not to Exceed | Error in Straightness within | |
¼ | ½ | 4 | ±2.5 | 1 | ±1.0 | 1 |
⅜ | ¾ | 6 | ±2.5 | 1.5 | ±1.5 | 1.5 |
½ | 1 | 6 | ±2.5 | 1.5 | ±1.5 | 1.5 |
¾ | 1½ | 8 | ±4.0 | 2 | ±2.0 | 2 |
1 | 2 | 10 | ±4.0 | 2.5 | ±2.5 | 2.5 |
1¼ | 2½ | 10 | ±5.0 | 2.5 | ±2.5 | 2.5 |
1½ | 3 | 12 | ±5.0 | 3 | ±3.0 | 3 |
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