CALIBRATION TOLERANCE TABLES Calibration Tolerance Tables Table 21a. Calibration Tolerance Tables, English Machinery's Handbook, 31st Edition
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Measuring Faces
Indicated Measurement Error, max. (in.)
Spindle/Anvil Alignment
Permissible Flexure (in.)
Flatness, max. (in.) 0.00005 0.00005 0.00005 0.00008 0.00008 0.00008 0.00008 0.00008 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001
Parallelism, max. (in.)
Error max. (in.) 0.002 0.003 0.0045 0.006 0.007 0.009 0.010 0.010 0.010 0.010 0.010 0.010 0.010 0.010 0.010 0.010
Size (in.)
Range (in.)
1 2 3 4 5 6 7 8 9
0–1 1–2 2–3 3–4 4–5 5–6 6–7 7–8
0.0001 0.0001 0.0001 0.00015 0.00015 0.00015 0.0002 0.0002 0.0003 0.0003 0.0003 0.0003 0.0005 0.0006 0.0007
0.00005 0.00010 0.00015 0.0002 0.0002 0.0002 0.00025 0.00025 0.00025 0.0003 0.0003 0.0003 0.0004 0.0005 0.0006 0.0007
0.0001 0.00015 0.00015 0.0002 0.0002 0.0002 0.00025 0.00025 0.00025 0.0003 0.0003 0.0003 0.0004 0.0005 0.0006 0.0007
8–9 9–10 10–11 11–12
10 11 12
13 to 18 Per 1 inch 0.0004
19 to 24 25 to 30 31 to 36
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Table 21b. Calibration Tolerance Tables, Metric
Measuring Faces
Indicated Measurement Error, max. (mm)
Spindle/Anvil Alignment Error, max. (mm)
Permissible Flexure (mm)
Flatness, max. (mm)
Parallelism, max. (mm)
Size (mm)
Range (mm) 0–13 0–25 25–50 50–75
13 25 50 75
0.0025 0.0025 0.0025 0.0025 0.004 0.004 0.004 0.005 0.005 0.005 0.008 0.008 0.008
0.001 0.0012 0.0012 0.0012 0.002 0.002 0.002 0.002 0.002 0.002 0.0025 0.0025 0.0025
0.0012 0.0012 0.0025 0.004 0.005 0.005 0.005 0.006 0.006 0.006 0.0075 0.0075 0.0075
0.003 0.004 0.004 0.004 0.005 0.005 0.005 0.006 0.006 0.006 0.0075 0.0075 0.0075
0.03 0.05 0.08 0.11 0.15 0.19 0.23 0.25 0.25 0.25 0.25 0.25
100 75–100 125 100–125 150 125–150 175 150–175 200 175–200 225 200–225 250 225–250 275 250–275
300 275–300 0.25 Note: Indicated Measurement Error tolerances for UUT with 0.001 inch graduations (no vernier scale) are set to ±0.001 up to 30 inch, and ±0.002 inch from 31 to 36 inch. Tolerances of UUT over 36 inch are subject to manufacturer’s specification. Tolerance for UUT with a resolution of 50 µ in shall be ±50 µ in for 0–1 inch; ±0.0001 inch for 1 through 4 inches; ±0.0002 inch for 4 three 9 inches; ±0.0003 inch for 9 three 12 inches; ±0.0004 inch for 12 to 18 inches; ±0.0005 for 18 to 24 inches; ±0.0006 for 24 to 30 inches; and ±0.0007 for 30 to 36 inches. All metric equivalents shall apply to UUT of this resolution. Metric Scale UUT with 0.01 mm graduations are set at ±0.01 mm for up to 300 mm. Tolerances above 300 mm are subject to manufacturers specifications.
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