287 2Accuracy Standards 2Circularity, Straightness, L Dimension Accuracy 2Concentricity, Perpendicularity 2O.D. g6, h5 Shafts (Hardened) 2O.D. f8 Shafts (Not Hardened) 2D Section Circularity Unit: mm 2D Section Circularity Unit: mm 2Straightness Unit: mm 2Straightness Unit: mm 2Straightness Measurement Method Features of Precision Shafts: Perpendicularity is 0.03 , Concentricity (Threaded and Stepped) is Ø0.02 . A B Deviation Value = A-B 2Thread Undercut Dimensions (PC, QC) (Reference Values) O.D. Tolerance g6, h5 Shafts (Hardened), O.D. Tolerance f8 Shafts (Plated) When specifying Shafts with thread undercuts or adding thread undercut alterations (PC, QC), PC and QC dimensions are as the table below. When B(S) is specified, undercut width (g) is F-B (T-S). Refer to the table below for the dimensions of PC and QC when combined with Fine Thread alterations (PMC, PMS, QMC, QMS, MMC, MMS, NMC, and NMS). t'PS $PBSTF 5ISFBET t8IFO DPNCJOFE XJUI 'JOF 5ISFBE "MUFSBUJPOT F B g M P PC g T S N Q QC P(=M) Q(=N) PC QC F-B (T-S) 6 4.4 2 8 6.0 3 10 7.7 12 9.4 4 16 13.0 20 16.4 5 24 19.6 30 25.0 PMC, MMC QMC, NMC PC QC F-B (T-S) 6 4.8 2.0 8 6.4 10 8.4 12 10.4 15 13.4 17 15.4 20 18.4 25 22.7 3.0 30 27.7 PMS, MMS QMS, NMS PC QC F-B (T-S) 10 8.0 3.0 12 9.7 14 11.7 18 15.7 D L Straightness K 3, 4 N/A (L/100)x0.05 or Less 5 N/A (L/100)x0.03 or Less 6~50 100 or Less 0.01 or Less Over 100 (L/100)x0.01 or Less Condition Straightness K L L≤100 0.025 or Less L>100 (L/100)x0.025 or Less Shaft ends are supported on V-blocks and turned 360 degrees to measure shaft runout using a dial indicator. 1/2 of measured runout is defined as the straightness. L - M K D P D Precision Type Standard Type 0.03 0.2 Precision Type Standard Type Ø0.02 Ø0.1 D Precision Type Standard Type 0.03 0.2 P D Precision Type Standard Type 0.03 0.2 Precision Type Standard Type Ø0.02 Ø0.1 4-Through Holes Both Ends Tapped Shaft t Precision Type does not require stepped machining as , which enables effective assembly. & Hollow shaft interior surfaces are not plated, which causes rust. 2"CPVU )PMMPX 4IBGU 8BMM 5IJDLOFTT %FWJBUJPOT Unit: mm O.D. (D) SUJ2 8BMM 5IJDLOFTT %FWJBUJPO 7BMVF 464 $ &RVJWBMFOU 8BMM 5IJDLOFTT %FWJBUJPO 7BMVF 6 0.3 or Less - 8 0.4 or Less 1.5 or Less 10 4.0 or Less 12 13 16 20 25 0.6 or Less 30 1.0 or Less 35 - 40 1.5 or Less 50 D Circularity M 0WFS or Less 2 13 0.004 13 20 0.005 20 40 0.006 40 50 0.007 D Circularity M 0WFS or Less 5 10 0.011 10 18 0.014 18 30 0.017 30 50 0.020 2L, Y Dimension Tolerances Unit: mm 2L, Y Dimension Tolerances Unit: mm Dimension Dimension Tolerance 0WFS or Less 2 6 ±0.1 6 30 ±0.2 30 120 ±0.3 120 400 ±0.5 400 1000 ±0.8 1000 1500 ±1.2 Dimension Dimension Tolerance 0WFS or Less 3 6 ±0.1 6 30 ±0.2 30 120 ±0.3 120 400 ±0.5 400 1000 ±0.8 1000 1500 ±1.2 Lineart Shaft Precision Standards
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