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| | | Mexico, CENAM (Centro Nacional de Metrologia) | | | Complete CMCs in Length for Mexico (.PDF file)
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| End standards. Gauge block: central length L, 0.5 mm to 100 mm | | Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: Q[19, 0.45L], L in mm, values range from 19 nm to 49 nm | | Interferometry, exact fractions | | Material: steel | | Internal NMI service identifier: CENAM/8 |
| | | End standards. Gauge block: central length L, 0.5 mm to 100 mm | | Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: Q[24, 0.42L], L in mm, values range from 24 nm to 49 nm | | Interferometry, exact fractions | | Material: ceramic | | Internal NMI service identifier: CENAM/8 |
| | | End standards. Gauge block: central length L, 0.5 mm to 100 mm | | Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: Q[28, 0.33L], L in mm, values range from 28 nm to 44 nm | | Interferometry, exact fractions | | Material: tungsten carbide | | Internal NMI service identifier: CENAM/8 |
| | | End standards. Gauge block: central length L, 0.5 mm to 100 mm | | Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: Q[28, 0.39L], L in mm, values range from 28 nm to 48 nm | | Interferometry, exact fractions | | Material: chrome carbide | | Internal NMI service identifier: CENAM/8 |
| | | End standards. Length bar (long gauge block): central length L, 100 mm to 300 mm | | Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: Q[19, 0.45L], L in mm, values range from 49 nm to 137 nm | | Interferometry, exact fractions | | Material: steel | | Internal NMI service identifier: CENAM/8b |
| | | End standards. Length bar (long gauge block): central length L, 100 mm to 300 mm | | Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: Q[24, 0.42L], L in mm, values range from 49 nm to 129 nm | | Interferometry, exact fractions | | Material: ceramic | | Internal NMI service identifier: CENAM/8b |
| | | End standards. Length bar (long gauge block): central length L, 100 mm to 300 mm | | Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: Q[28, 0.33L], L in mm, values range from 44 nm to 103 nm | | Interferometry, exact fractions | | Material: tungsten carbide | | Internal NMI service identifier: CENAM/8b |
| | | End standards. Length bar (long gauge block): central length L, 100 mm to 300 mm | | Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: Q[28, 0.39L], L in mm, values range from 48 nm to 121 nm | | Interferometry, exact fractions | | Material: chrome carbide | | Internal NMI service identifier: CENAM/8b |
| | | End standards. Gauge block: central length L, 0.5 mm to 100 mm | | Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: Q[29, 0.94L], L in mm, values range from 29 nm to 99 nm | | Mechanical comparison to gauge block | | Material: steel | | Internal NMI service identifier: CENAM/9 |
| | | End standards. Length bar (long gauge block): central length L, 0.125 m to 0.25 m | | Absolute expanded uncertainty (k = 2, level of confidence 95%) in µm: (0.18 + 0.7L), L in m, values range from 0.27 µm to 0.36 µm | | 1-D stylus comparator, gauge substitution | | Internal NMI service identifier: CENAM/10 |
| | | End standards. Step gauge: face spacing L, 0.02 m to 1.2 m | | Absolute expanded uncertainty (k = 2, level of confidence 95%) in µm: (0.35 + 0.4L) | | CMM and laser interferometer | | Approved on 14 June 2004 | | Internal NMI service identifier: CENAM/13 |
| | | Diameter standards. External cylinder (plug): diameter, L, 0.005 m to 0.3 m | | Absolute expanded uncertainty (k = 2, level of confidence 95%) in µm: (0.18 + 0.4L) | | 1-D stylus comparator, gauge substitution | | Approved on 14 June 2004 | | Internal NMI service identifier: CENAM/16 |
| | | Diameter standards. Internal cylinder (ring): diameter L, 0.005 m to 0.205 m | | Absolute expanded uncertainty (k = 2, level of confidence 95%) in µm: (0.18 + 0.4L) | | 1-D stylus comparator, gauge substitution | | Maximal external size diameter: 300 mm | | Approved on 14 June 2004 | | Internal NMI service identifier: CENAM/17 |
| | | Diameter standards. External cylinder (pin or wire): diameter L, 0.1 mm to 5 mm | | Absolute expanded uncertainty (k = 2, level of confidence 95%) in µm: (0.25 + 0.001L) | | 1-D stylus comparator, gauge substitution | | Approved on 14 June 2004 | | Internal NMI service identifier: CENAM/18 |
| | | Diameter standards. Ball or sphere: diameter L, 0.005 m to 0.065 m | | Absolute expanded uncertainty (k = 2, level of confidence 95%) in µm: (0.18 + 0.4L) | | 1-D stylus comparator, gauge substitution | | Approved on 14 June 2004 | | Internal NMI service identifier: CENAM/19 |
| | | Angle artefacts. Angle block: included angle, 1 ° (or ', or ") to 45 ° (or ', or ") | | Absolute expanded uncertainty (k = 2, level of confidence 95%) in ": 0.3 | | Index table and autocollimator, full closure | | Specific angle sizes: 1, 2, 3, 5, 10, 15, 20, 30, 45 in °, or ', or " | | Approved on 14 June 2004 | | Internal NMI service identifier: CENAM/28 |
| | | Surface texture. Groove or step-height standard: step height, H, 0.03 µm to 10 µm | | Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: (15 + 2.7H), H in µm, ranges from 15 nm to 42 nm | | 2-D profile stylus instrument | | Approved on 14 June 2004 | | Internal NMI service identifier: CENAM/32 |
| | | Surface texture. Roughness standard: roughness parameter, 0.01 µm to 20 µm | | Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: (10 + 18P), P in µm, ranges from 10 nm to 370 nm | | 2-D profile stylus instrument | | Roughness parameter P: Ra, Rz, Rmax | | Approved on 14 June 2004 | | Internal NMI service identifier: CENAM/33 |
| | | CMM artefacts. Ball bar: ball spacing L, 10 mm to 1100 mm | | Absolute expanded uncertainty (k = 2, level of confidence 95%) in µm: (0.4 + 0.6E-03L) | | CMM and stylus, with gauge substitution | | Approved on 14 June 2004 | | Internal NMI service identifier: CENAM/36 |
| | | CMM artefacts. Ball and bore plates, L, 10 mm to 650 mm | | Absolute expanded uncertainty (k = 2, level of confidence 95%) in µm: (0.6 + 0.9E-03L) | | CMM and stylus, with gauge substitution and reversal methods | | Approved on 14 June 2004 | | Internal NMI service identifier: CENAM/37 |
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