B-61BMitutoyo reserves the right to change any or all aspects of any product specication, including prices, designs and service content, without notice.MicrometerThe origin of Mitutoyo’s trustworthy brand of small tool instrumentsOptical ParallelsSERIES 157• Designed to inspect parallelism and atness of measuring faces of micrometers. For details, refer to “Quick Guide to Precision Measuring Instruments”on page B-69. • Each set consists of 4 sizes to aid in testing parallelism at various angular positions of the micrometer spindle.Optical FlatsSERIES 158• Used for inspecting the atness of very at surfaces. For details, refer to “Quick Guide to Precision Measuring Instruments”on page B-69. 157-903158-118SPECIFICATIONSMetricOrder No.Range of micrometer to be checked (mm)Sizes of parallels included in set (mm)Diameter (mm)Flatness (µm)Parallelism (µm)Remarks (mm)157-9030 - 2512.00, 12.12, 12.25, 12.37ø300.10.2For 25157-90425 - 5025.00, 25.12, 25.25, 25.37For 50SPECIFICATIONSMetricOrder No.Thickness (mm)Diameter (mm)Flatness grade (µm)158-11712450.2158-1180.1158-11915600.2158-1200.1InchOrder No.Thickness (in)Diameter (in)Flatness grade (in)158-1220.51.80.000004158-1240.62.4InchOrder No.Range of micrometer to be checked (in)Sizes of parallels included in set (in)Diameter (mm)Flatness (µm)Parallelism (µm)Remarks (mm)157-9010 - 10.5000, 0.5062, 0.5125, 0.5187ø300.10.2For 25157-9021 - 21.0000, 1.0062, 1.0125, 1.0187For 50Note: Also available individually, using the following Order No. MetricOrder No.Thickness (mm)157-10112.00157-10212.12157-10312.25157-10412.37 MetricOrder No.Thickness (mm)157-10525.00157-10625.12157-10725.25157-10825.37InchOrder No.Thickness (in)157-1090.5000157-1100.5062157-1110.5125157-1120.5187InchOrder No.Thickness (in)157-1131.0000157-1141.0062157-1151.0125157-1161.0187
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