B-62BMitutoyo reserves the right to change any or all aspects of any product specication, including prices, designs and service content, without notice.3-Wire UnitsSERIES 313 • Attached to the measuring faces of both the spindle and anvil of the micrometer, enables measurement of pitch diameter of screw threads.• Determination of the pitch diameter: refer to “Quick Guide to Precision Measuring Instruments” on page B-68.Order No.(One pair)(Support spindle dia.)Wire dia.(mm)PitchMetric thread(mm)Unied thread(threads per inch)Whitworth thread (threads per inch)6.35 mm (0.25 in)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 mm3-Wire Units setOrder No.SetWire dia. (mm)Support spindle dia. (mm)313-101180.170 - 3.2006.35Note 1: Special-specication 3-wire units with a wire diameter other than those listed above (ø0.15 mm or more) can also be made to order.Note 2: Due to potential obstruction, the 3-wire unit cannot be used with screws having an external diameter exceeding ø50 mm.952141Micrometer Oil• Special lubricant for micrometers. SPECIFICATIONSOrder No.Product nameRemarks207000Micrometer oilGrease (32 ml)207000(32 ml)

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