MEASURING INSTRUMENTS CATALOG No.E2019
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B-29BMitutoyo 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 instruments3-Wire UnitsSERIES 313 • Enables measurement of the pitch diameter of screw threads with a standard micrometer. • Determination of the pitch diameter: refer to “Quick Guide to Precision Measuring Instruments”.Order No.(One pair)(Support spindle dia.)6.35 mm (0.25 in)Wire dia.(mm)PitchMetric thread(mm)Unied thread(threads per inch)Whitworth thread (threads per inch)9521310.1700.2, 0.25, 0.380—9521320.1950.3572—9521330.2200.464—9521340.2500.4556609521350.2900.548489521360.3350.644, 40409521370.3900.736369521380.4550.75, 0.832329521390.5300.92828, 269521400.6201.02424, 229521410.7251.252020, 19, 189521420.8951.518, 16169521431.1001.75, 2.014, 13, 1214, 129521441.3502.511, 1011, 109521451.6503.09, 89, 89521462.0503.5779521472.5504, 4.5669521483.2005, 5.5, 65, 4.55, 4.5SPECIFICATIONSTechnical Data• Accuracy of wire diameter: ±0.002 mm9521413-Wire Units setOrder No.SetWire dia. (mm)Support spindle dia. (mm)313-101180.170 - 3.2006.35

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