>> P.414
HoltestHoltestSERIES368—Three-point/Two-pointBoreMicrometers•Thesearestandardanalogthree-pointboremicrometers.(Atwo-pointcontacttypewithmeasuringrangeofø2to6mmisavailabletomeasureextremelysmallholes.)•Three-pointboremicrometerallowsstablemeasurementthroughselfcentering.•Canmeasureclosetothebottomofablindhole.•Titanium-coatedmeasuringpinsonthethree-pointtype(over6mmrangemodels)provideexcellentdurabilityandimpactresistance.•Three-pointtypecanmeasuredeepholesbyattachinganExtensionRod(optional).Measurementexample368-001(Two-pointcontacttype)368-168(Three-pointcontacttype)368-174(Three-pointcontacttype)InchCodeNo.Range*2(in)Graduation(in)ExtensionRod(optional)MaximumpermissibleerrorJMPE(in)*1ExtensionRod(optional)0.08-0.10.1-0.120.12-0.160.16-0.20.2-0.240.24-0.280.275-0.350.35-0.4250.425-0.50.5-0.650.65-0.80.8-11-1.21.2-1.61.6-22-2.5—0.0001±0.0001(maximumdifference0.0001)952322(100mm)952621(150mm)952622(150mm)±0.00015(maximumdifference0.00015)0.00022.5-33-3.53.5-44-55-66-77-88-99-1010-1111-12±0.0002(maximumdifference0.0002)±0.00025(maximumdifference0.00025)±0.0003(maximumdifference0.0003)952623(150mm)—952322(100mm)952621(150mm)952622(150mm)952623(150mm)(Two-point)368-021368-022368-023368-024368-025368-026(Three-point)368-261368-262368-263368-264368-265368-266368-267368-268368-269368-270368-271368-272368-273368-274368-275368-276368-277368-278368-279368-280368-281SPECIFICATIONSMetricCodeNo.Range*2(mm)Graduation(mm)MaximumpermissibleerrorJMPE(µm)*1±2(maximumdifference2)±3(maximumdifference3)±4(maximumdifference4)±5(maximumdifference5)±6(maximumdifference6)0.0010.005(Two-point)368-001368-002368-003368-004368-005(Three-point)368-161368-162368-163368-164368-165368-166368-167368-168368-169368-170368-171368-172368-173368-174368-175368-176368-177368-178368-179368-180368-1812-2.52.5-33-44-55-66-88-1010-1212-1616-2020-2525-3030-4040-5050-6362-7575-8887-100100-125125-150150-175175-200200-225225-250250-275275-300Holtest*1Additionally,thedifferenceinpermissibleerrorallowableislimitedtoavaluewithinthisrange,asgiveninparentheses,andismeasuredwiththeentiremeasuringsurfaceincontactwiththeobjectmeasured.*2Themeasurementrangecannotbeenlargedbymeasuringheadsthatarenotstandard-supplied(theaccuracyisnotguaranteed).Note:Settingringsareoptional.08-7
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