F-55FMitutoyo reserves the right to change any or all aspects of any product specication, including prices, designs and service content, without notice.Dial IndicatorsComparison measuring instruments which ensure high quality, high accuracy and reliability.• Back Plunger type dial indicators are suitable for mounting onto leveling machine tool tables or inspection jigs, and for use in small spaces where the graduations of standard dial indicators are difcult to see. • Models 2960T, 2961T, 2990T-10 and 2991T-10, which use Mitutoyo’s proprietary shock-proong mechanism, have excellent durability and shock resistance. • Model 2990T-10 provides 0.001 mm graduation.Back Plunger Type Dial IndicatorsSERIES 2Metric Order No.Graduation (mm)Range (range/rev) (mm)Accuracy* (µm)Repeatbility (µm)Dial readingMeasuring force (N)Measuring rangeRetrace1/10 Rev1 Rev2960T0.011 (1.27)1448—350-0-501.4 or less2990T-100.0010.1 (0.14)522.5—150-0-501.5 or lessMetricOrder No.———2960T44————2990T-10444———InchOrder No.———2961T44————299T-10444——— ISO/JIS typeInch Order No.Graduation (in)Range (range/rev) (in)Accuracy* (in)Repeatbility (in)Dial readingMeasuring force (N)First 1 Rev/2.5 Rev/10 RevRetrace2961T0.00050.04/0.05±0.0005/—/—0.00016±0.000120-0-201.4 or less2991T-100.00010.008/0.01±0.0002/—/—0.0001±0.000054-0-41.5 or less ANSI/AGD typeDIMENSIONS Unit: mmUnit: inISO/JIS TypeANSI/AGD TypeHolding bar (optional) Order No.DL21AAA166ø6 mm42 mm136567ø6 mm81 mm124625ø6.35 mm81 mm21AAA167ø6.35 mm42 mm21AAA168ø8 mm42 mm136568ø8 mm81 mmNote: øD and L: detail shown in drawing below.2960T2990T-102960T One revolution Shockproof Back Plunger2990T-10 One revolution Shockproof Back Plunger Jeweled bearingBalanced scale 10100Balanced scale 10100Holding barGraduation: 0.01 mm, Measuring range: 1 mmGraduation: 0.01 mm, Measuring range: 1 mmAn inspection certicate is supplied as standard. Refer to page U-11 for details.φ80-0.009φ55.612.823.728M2.5x0.455φ55.628φ8-0.009 023.712.8φ35.622.1M2.5×0.45φ4(ø6 only)Holding bar (optional)M2.5×0.45F-49-1(2960F)ø8 0-0.009ø4øDLBøAFGEøCH5Holding bar (optional)(ø6 only)M2.5×0.45546ø35.622.212.828.7ø5723.3LøDø4ø8 0-0.009FGB5HM2.5×0.45ø8 0-0.009ø4EøCFGøAB5Holding bar (optional)M2.5×0.455ø5839.1ø5759.517.526.5ø5125.5øDLø4ø8 0-0.0092990T-102960T(ø6 mm only)Holding bar (optional)4-48UNFø0.16øDL0.92ø2.240.980.430.87ø1.401.590.20ø0.375 0-0.00124-48UNFHolding bar(optional)ø2.28ø0.375 0-0.0012ø0.16L1.00ø2.011.040.532.19ø2.241.540.202991T-102961T* The shoulder on a contact point (standard accessory) for 2960T and 2961T acts as a stop to prevent spindle overrun that may otherwise damage the indicator. For this reason, if you need to install an optional contact point with an outside diameter smaller than 7 mm, use a washer (with outside diameter of at least 7 mm, inside diameter of 3 mm, and thickness of approx. 0.5 mm) placed between the contact point and the spindle.* Completed products inspection is performed in the vertical orientation (contact point downward) and the stated accuracy is guaranteed.* Completed products inspection is performed in the vertical orientation (contact point downward) and the stated accuracy is guaranteed.