C-49CMitutoyo reserves the right to change any or all aspects of any product specication, including prices, designs and service content, without notice.C-49Inside Micrometersラチェットストップシンブルスピンドル外筒コーン測定子RatchetThimbleSpindleSleeveConeContact pointCQuick Guide to Precision Measuring InstrumentsType of featureWorkpiece prole (example)Contact point tip prole (example)RemarksSquare groove• Allows measurement of the diameter of variously shaped inside grooves and splines.• Minimum measurable groove diameter is approximately 16 mm (differs depending on the workpiece prole.)• Dimension should be as follows: For W=less than 2 mm: =less than 2 mm For W=2 mm or more: =2 mm as the standard value which can be modied according to circumstances.• The number of splines or serrations is limited to a multiple of 3.• Details of the workpiece prole should be provided at the time of placing a custom-order.• If your application needs a measuring range different from that of the standard inside micrometer an additional initial cost for the master ring gage will be required.Round grooveSplineSerrationThreaded hole• Allows measurement of the effective diameter of an internal thread.• Measurable internal threads are restricted according to the type, nominal dimension, and pitch of the thread. Please contact Mitutoyo with the specication of the thread to be measured for advice.Custom-ordered Products (Holtest/Borematic)Mitutoyo can custom-build an inside micrometer best suited to your special application. Please feel free to contact Mitutoyo about the possibilities - even if only one custom-manufactured piece is required. Please note that, depending on circumstances, such a micrometer will usually need to be used with a master setting ring for accuracy assurance. (A custom-ordered micrometer can be made compatible with a master ring supplied by the customer. Please consult Mitutoyo.)Nomenclature (Holtest)aøDH2H1ødøDHødøDHTip radius R that can measure the minimum diameter (different for each size)35-45mm/N000000/N00000035-45mm35-45mm/N000000/N00000035-45mm35-45mm/N000000ød45051DIV. 0.005mm45435-45mmS/N000000røDrrrødøDW=1 or moreTip radius R that can measure the minimum diameter (different for each size)W=1 or moreR=0.5 or moreW=0.5 or moreTip radius R that can measure the minimum diameter (different for each size)45˚ or moreR=0.3 or more

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