291 Reference: Tolerance range of O.D. of linear bushings and diameter of housing made by MISUMI Product Customer's design I.D. dr O.D. (D) Housing Dia. Tolerance Tolerance H7 3 7 0 - 0.009 7 +0.015 0 4 8 8 5 10 10 6 12 0 - 0.011 12 +0.018 0 8 15 15 10 19 0 - 0.013 19 +0.021 0 12 21 21 13 23 23 16 28 28 20 32 0 - 0.016 32 +0.025 0 25 40 40 30 45 45 35 52 0 - 0.019 52 +0.030 0 40 60 60 50 80 80 2 Mounting with Retaining Ring Housing Retaining Ring Stopper Housing Housing Retaining Ring 2 Mounting with Stoppers Structure of Linear Bushings Outer Cylinder Side Ring Retainer Steel Balls t Linear Bushings are used in combination with Linear Shafts, and it is the linear motion mechanism utilizing rolling steel balls for unlimited linear motion. t Linear bushings imparts unlimited stroke linear motion on shafts by steel balls recirculating within the raceway grooves formed by the outer cylinder and retainer. t Can obtain linear motion with lower friction and high accuracy compared to slide bearings, and used for many applications such as transfer equipment and semiconductor manufacturing systems. Cautions on Selection and Usage 'PS .*46.* MJOFBS CVTIJOHT VTF JO DPNCJOBUJPO XJUI .*46.* TIBGUT IBSEFOFE XJUI H UPMFSBODF JT SFDPNNFOEFE For MISUMI Linear Bushings, mounting Housing of H7 tolerance is SFDPNNFOEFE #VTIJOH BOE )PVTJOH XJMM CF DMFBSBODF GJU If large moment load (offset load) is to be applied, Short/Single Type Linear Bushings are not suitable. Use of Double Type or Multiple Linear Bushings is recommended. Linear Bushings are not suitable for rotating motion and uses that need repetitive insertion and extraction from shafts.Forced use may prove to be the cause of damage. Use Retaining Ring (Snap Ring), Stoppers, etc., when mounting Linear Bushings and Housing. 4FMFDUJPO "TTFNCMZ When assembling with linear shafts, forcing the shaft into the bushing with angular misalignment may cause the ball retainers to deform and balls to fall out. Be sure to align the centers and insert the shaft gently. t "U UIF UJNF PG EFMJWFSZ Other than the MX Lubrication Units, MISUMI Linear Bushings are applied with Anti-rust Oil harmless to the bearing lubrication greases. After de-greasing the Antirust Oil, application of grease is recommended. L, G, and H Grease filled types are also available. The MX Lubrication Units are filled with lithium soap-based grease. t .BJOUFOBODF Before usage, apply grease to the ball rows within the Linear bushings, then periodically apply grease during the use. The grease has an effect of reducing friction by forming a layer between the balls and shaft rolling surfaces, preventing seizures. Grease loss and deterioration will cause shorter life of linear guides. Recommended Grease: Lithium soap based grease (Alvania Grease S2 by Showa Shell Sekiyu). Recommended Greasing Interval: Normally 6 months * Every 3 month when travel distance is extensive, or every 1000km. -VCSJDBUJPO BOE .BJOUFOBODF Linear Bushings Double Fitting Design Bushing Bushing Shaft Housing [Fitting of Shaft O.D. and Bushing I.D.] [Fitting of Bushing O.D. and Housing I.D.] Reference: Tolerance range of I.D. of linear bushings and O.D. of shafts made by MISUMI Dimension (mm) Linear Bushings Single Type (LMU) I.D. Tolerance Shaft (SFJ) O.D. Tolerance (g6) 0 Ø3~5 Ø6~16 Ø20~30 Ø35~50 -0.001 -0.002 Ø3 -0.003 -0.004 Ø4~6 -0.005 Ø8~10 -0.006 Ø12~18 -0.007 Ø20~30 -0.008 -0.009 Ø35~50 -0.010 -0.011 -0.012 -0.013 -0.014 -0.015 -0.016 -0.017 -0.018 -0.019 -0.020 -0.021 -0.022 -0.023 -0.024 -0.025 Linear Bushing Cautions on Selection and Usage / Various Greases
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