CylindriCal and Tapered roller Bearings

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Mounting and Fitting Practice General Fitting Practice Separable Bearings Shaft Inner Ring Fit Page Outer Ring Fit Page Rotating Press 91-92 92-93 Tap 97-98 98-99 Stationary Tap 93-94 94-95 Press 100-101 99-100 MU----TV, MU----UV, MU----TM, MU----UM Non-Separable Bearings Shaft Inner Ring Fit Page Outer Ring Fit Page Rotating Press 91-92 92-93 Push 95-96 96-97 * “A” Style Fitting Practice Over Size O.D. Identified by suffix letter “A” in part number Shaft Inner Ring Fit Page Outer Ring Fit Page Rotating or Press 91-92 92-93 Heavy Press* 101-102 102-103 Stationary Inner or Outer Ring Omitted Inner Ring Omitted M----EL, M----TV Shaft Inner Ring Fit Page Outer Ring Fit Page Rotating Shaft Dia. 103 104 Tap/Heavy Press* 97-98/101-102 98-99/102-103 Stationary Shaft Dia. 109 105 Press 91-92 92-93 Outer Ring Omitted MU----L, MU----V Shaft Inner Ring Fit Page Outer Ring Fit Page Rotating Press 91-92 92-93 Housing Bore 106 107 Stationary Tap 93-94 94-95 Housing Bore 105 106 * Over size outer ring for heavy press fit in standard (tap fit) size housing bore. NOTE: The NTN Engineering Department should be consulted for any modification of the above fitting practice. 89
Cylindrical Roller Bearings Fitting Practice The fitting practice given in the following tables conforms to industry and ABMA/ANSI standards, where applicable. The tables provide maximum and minimum sizes for bearing bore and O.D., shaft and housing bore, and the resultant effects of each type of fit. Dimensions are given in both inch and metric units with deviations in .0001 inch and micrometers. The looseness or tightness of a ring mounted on a shaft or in a housing bore depends on the conditions under which the bearing will operate and how it will be installed. The three most generally used fits are: PRESS, TAP AND PUSH. PRESS fit is used to fit a ring tightly to a rotating member (shaft or housing) to prevent creep or slippage that could result in damage to the shaft or housing bore. TAP fit usually accompanies PRESS fit, for fitting the opposite ring to the stationary member, if the bearing rings are separable. PUSH fit is used instead of TAP, for a stationary outer ring, if the bearing is non-separable. HEAVY PRESS fit (“A” style) is an NTN-Bower innovation for cylindrical roller bearings. It is used to prevent the outer ring from turning in the housing bore, where the bearing is operating under very heavy loads. The outer ring O.D. is made oversize to provide a heavy press fit in a standard (tap fit) size housing bore. The accompanying inner ring uses a PRESS fit on the shaft. The catalog fitting practice does not apply to bearings mounted on hollow shafts or in housings of materials softer than steel, such as as aluminum. Since these conditions Since these usually conditions require usually heavier require press heavier fits, the press NTN Engineering fits, the NTN Department Engineering Department should be should consulted be consulted for for recommendation. recommendation. The chart on on the the opposite opposite page page summarizes summarizes the recommended fitting fitting practice practice for various for various installations installations and the recommended and bearing bearing types, types, including including bearings bearings with inner with or inner outer or outer rings omitted. rings omitted. 90
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CylindriCal and Tapered roller Bear
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Table of Contents INTRODUCTION. . .
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Table of Contents TAPERED ROLLER BE
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Introduction Cylindrical Roller Bea
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Engineering Section Glossary of Sym
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Engineering Section BEARING LOAD RA
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Engineering Section Tangential Comp
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Engineering Section An Imbalance Fo
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Engineering Section SPECIAL CASES V
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Engineering Section The These value
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Engineering Section lubrication the
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Engineering Section a 3 —Lubricat
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Engineering Section LIMITING SPEEDS
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Engineering Section LUBRICATION The
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Engineering Section Grease GREASE G
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Introduction Cylindrical Roller Bea
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Introduction Bearing CAGES “M”
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Bearing Selection STANDARD SERIES M
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Bearing Selection Bearing Types SEP
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Bearing Selection Bearing Types SEP
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Bearing Selection Bearing Types NON
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Dimensions and Ratings r Wr r r R R
Page 46 and 47: Dimensions and Ratings r r H A C F
Page 70 and 71: Dimensions and Ratings W MAX-PAK (M
Page 80 and 81: Dimensions and Ratings C W MOJ & MO
Page 82 and 83: Dimensions and Ratings Custom “R
Page 84 and 85: Dimensions and Ratings “R” Seri
Page 86 and 87: Dimensions and Ratings Mast and Cha
Page 88 and 89: Dimensions and Ratings Rotational o
Page 90 and 91: Dimensions and Ratings Outer Ring G
Page 92 and 93: Dimensions and Ratings Internal Dia
Page 94 and 95: Dimensions and Ratings Internal Dia
Page 98 and 99: Mounting and Fitting Practice Inner
Page 100 and 101: Mounting and Fitting Practice Inner
Page 102 and 103: Mounting and Fitting Practice 1900
Page 104 and 105: Mounting and Fitting Practice Outer
Page 110 and 111: Mounting and Fitting Practice Shaft
Page 112 and 113: Mounting and Fitting Practice Housi
Page 114 and 115: Introduction Tapered Roller Bearing
Page 116 and 117: Introduction Bearing Design True Ro
Page 118 and 119: Bearing Selection by Bore Size Bear
Page 120 and 121: Bearing Selection by Bore Size Bear
Page 122 and 123: Dimensions and Ratings W W W o W o
Page 124 and 125: Dimensions and Ratings Load Rating:
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Dimensions and Ratings Load Rating:
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Dimensions and Ratings T W f D f W
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Dimensions and Ratings W p W p W i
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Dimensions and Ratings Bore Diamete
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Tolerances Tolerances for Metric Sy
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Fitting Practice Tables Cone Fittin
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CylindriCal and Tapered roller Bearings

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