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Tolerances for Used Gauge Blocks
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Metric
| Nominal Length | Tolerances of deviation of measured central length from nominal at 20oC | Maximum associated uncertainty of measurement | Tolerances on variation of measured length | |||||||||||
| Greater than | Less than or equal to | Grade | ||||||||||||
| 0 | 1 | 2 | 3 | 4 | 0, 1 & 2 | 3 | 4 | 0 | 1 | 2 | 3 | 4 | ||
| Unit (mm) | Unit 0.001mm (1µm) | |||||||||||||
| 0 | 10 | ±0.12 | ±0.25 | ±0.50 | +0.50 -1.00 |
+0.50 -2.00 |
±0.08 | ±0.08 | ±0.10 | 0.10 | 0.16 | 0.30 | 0.40 | 0.50 |
| 10 | 25 | ±0.15 | ±0.30 | ±0.60 | +0.60 -1.20 |
+0.60 -2.40 |
±0.10 | ±0.10 | ±0.13 | 0.10 | 0.16 | 0.30 | 0.40 | 0.50 |
| 25 | 50 | ±0.20 | ±0.40 | ±0.80 | +0.80 -1.60 |
+0.80 -3.20 |
±0.12 | ±0.12 | ±0.17 | 0.10 | 0.18 | 0.30 | 0.40 | 0.50 |
| 50 | 75 | ±0.25 | ±0.50 | ±1.00 | +1.00 -2.00 |
+1.00 -4.00 |
±0.15 | ±0.15 | ±0.21 | 0.12 | 0.18 | 0.35 | 0.40 | 0.50 |
| 75 | 100 | ±0.30 | ±0.60 | ±1.20 | +1.20 -2.40 |
+1.20 -4.80 |
±0.18 | ±0.18 | ±0.25 | 0.12 | 0.20 | 0.35 | 0.40 | 0.50 |
Inch
| Nominal Length | Tolerances of deviation of measured central length from nominal at 20oC | Maximum associated uncertainty of measurement | Tolerances on variation of measured length | |||||||||||
| Greater than | Less than or equal to | Grade | ||||||||||||
| 0 | 1 | 2 | 3 | 4 | 0, 1 & 2 | 3 | 4 | 0 | 1 | 2 | 3 | 4 | ||
| Unit ( in ) | Unit 0.001 in (1µ in ) | |||||||||||||
| 0 | 0.4 | ± 5 | ±10 | ±20 | +20 -40 |
+20 -80 |
±3 | ±4 | ±6 | 4 | 6 | 12 | 16 | 20 |
| 0.4 | 1 | ±6 | ±12 | ±25 | +25 -50 |
+25 -100 |
±4 | ±5 | ±8 | 4 | 6 | 12 | 16 | 20 |
| 1 | 2 | ±8 | ±15 | ±30 | +30 -60 |
+30 -120 |
±5 | ±6 | ±10 | 4 | 7 | 12 | 16 | 20 |
| 2 | 3 | ±10 | ±20 | ±40 | +40 -80 |
+40 -160 |
±6 | ±8 | ±12 | 5 | 7 | 14 | 16 | 20 |
| 3 | 4 | ±12 | ±25 | ±50 | +50 -100 |
+50 -200 |
±7 | ±10 | ±14 | 5 | 8 | 14 | 16 | 20 |
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Broomfield Carbide Gauges Ltd., Brigg Mills, 3 The Cobbles, Meltham, Holmfirth HD9 5QQ
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