Ball and Roller Bearings - Ntn-snr.com

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Boundary Dimensions and Bearing Number Codes 5. Boundary Dimensions and Bearing Number Codes 5.1 Boundary dimensions A rolling bearing's major dimensions, known as "boundary dimensions," are shown in Figs. 5.1 - 5.3. To facilitate international bearing interchangeability and economical bearing production, bearing boundary dimensions have been standardized by the International Standards Organization (ISO). In Japan, rolling bearing boundary dimensions are regulated by Japanese Industrial Standards (JIS B 1512). Those boundary dimensions which have been standardized include: bearing bore diameter, outside diameter, width/height, and chamfer dimensions - all important dimensions when considering the compatibility of shafts, bearings, and housings. However, as a general rule, bearing internal construction dimensions are not covered by these dimensions. For metric rolling bearings there are 90 standardized bore diameters (d) ranging in size from 0.6mm - 2,500mm. Outer diameter dimensions (D) for radial bearings with standardized bore diameter dimensions are covered in the "diameter series;" their corresponding width dimensions (B) are covered in the "width series." For thrust bearings there is no width series; instead, these dimensions are covered in the "height series." The combination of all these series is known as the "dimension series." All series numbers are shown in Table 5.1. Although many rolling bearing dimensions are r B r T C r r r r r r r d d r r r r d D E B r α d D T D D r r Fig. 5.1 Radial bearings (excluding tapered roller bearings) Table 5.1 Dimension series numbers Fig. 5.2 Tapered roller bearings Dimension series Fig. 5.3 Single direction thrust bearings Radial bearings (excluding tapered roller bearings) Tapered roller bearings Thrust bearings Diameter series (outer diameter dimensions) number dimensions small large small large number number dimensions 7, 8, 9, 0, 1, 2, 3, 4 8, 0, 1, 2, 3, 4, 5, 6 9, 0, 1, 2, 3 dimensions small large small large 0, 1, 2, 3, 4 small large Width series (width dimensions) 0, 1, 2, 3 Height series (height dimensions) 7, 9, 1, 2 small large Reference diagram Diagram 5.4 Diagram 5.5 Diagram 5.6 Dimension series Diameter series Width series Diameter series Height series Dimension series Fig. 5.4 Dimension series for radial bearings (excluding tapered roller bearings) Diameter series Width series Fig. 5.5 Dimension series for tapered roller bearings Fig. 5.6 Dimension series for thrust bearings A-28
Boundary Dimensions and Bearing Number Codes standardized, and have been listed here for purposes of future standardization, there are many standard bearing dimensions which are not presently manufactured. Boundary dimensions for radial bearings (excluding tapered roller bearings) are shown in the attached tables. 5.2 Bearing numbers Rolling bearing part numbers indicate bearing type, dimensions, tolerances, internal construction, and other related specifications. Bearing numbers are comprised of a "basic number" followed by "supplementary codes." The makeup and order of bearing numbers is shown in Table 5.2. The basic number indicates general information about a bearing, such as its fundamental type, boundary dimensions, series number, bore diameter code and contact angle. The supplementary codes derive from prefixes and suffixes which indicate a bearing's tolerances, internal clearances, and related specifications. (Bearing number examples) 6205ZZC3 2A Shell Alvania 2 grease Radial internal clearance C3 shielded (both) Nominal bore diameter 25mm Diameter series 2 Deep groove ball bearing 23034BD1 Lubrication hole/lubrication groove (when outer diameter is less than 320mm) Type B Nominal bore diameter 170mm Dimension series 0 Width series 3 Spherical roller bearing 7012CDB GMP4 Tolerances JIS Class 4 Medium preload Back-to-back duplex arrangement Contact angle 15° Nominal bore diameter 60mm Dimension series 0 Angular contact ball bearing 240 750BK30 Bore diameter: tapered inner ring bore, standard taper ratio 1:30 Type B Nominal bore diameter 750mm Dimension series 0 Width series 4 Spherical roller bearing NU320G1C3 51120L1P5 Radial internal clearance C3 High strength machined brass rivetless cage with square holes Dimension series 3 Cylindrical roller bearing NU type Tolerances JIS Class 5 High strength, machined brass cage Nominal bore diameter 100mm Diameter series 1 Height series 1 Thrust ball bearing 4T 30208 Nominal bore diameter 40mm Diameter series 2 Width series 0 Tapered roller bearing Spec. 4T (top tapered) A-29
Page 1 and 2: For New Technology Network R corpor
Page 3 and 4: Warranty NTN warrants, to the origi
Page 5 and 6: TECHNICAL DATA CONTENTS 1. Classifi
Page 7 and 8: Classification and Characteristics
Page 13 and 14: Bearing Selection Select bearing’
Page 15 and 16: Bearing Selection 2.3 Selection of
Page 17 and 18: Load Rating and Life 3. Load Rating
Page 19 and 20: Load Rating and Life where, Lna : A
Page 21 and 22: Bearing Load Calculation 4. Bearing
Page 23 and 24: Bearing Load Calculation 4.1.2 Chai
Page 25 and 26: Bearing Load Calculation 4.4 Equiva
Page 27 and 28: Bearing Load Calculation 4.5 Allowa
Page 29: Bearing Load Calculation Fr2 70 K
Page 33: Boundary Dimensions and Bearing Num
Page 36 and 37: Bearing Tolerances Table 6.3 Tolera
Page 46 and 47: Bearing Tolerances 6.2 Chamfer meas
Page 48 and 49: Bearing Tolerances 6.3 Bearing tole
Page 50 and 51: Bearing Fits 7.3.2 Recommended Fits
Page 52 and 53: Bearing Fits Table 7.2 (3) Housing
Page 54 and 55: Bearing Fits Table 7.5 Numeric valu
Page 56 and 57: Bearing Fits Table 7.6 Fits for inc
Page 58 and 59: Bearing Internal Clearance and Prel
Page 70 and 71: Allowable Speed 9. Allowable Speed
Page 72 and 73: Lubrication 11. Lubrication 11.1 Lu
Page 74 and 75: Lubrication (1) Base oil Natural mi
Page 76 and 77: Lubrication 11.4 Solid grease (For
Page 78 and 79: Lubrication Bearing operating Lubri
Page 80 and 81:
External bearing sealing devices 12
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External bearing sealing devices Ty
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Bearing Materials 13.2 Cage materia
Page 86 and 87:
Shaft and Housing Design 14.2 Beari
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Bearing Handling 15. Bearing Handli
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Bearing Handling a) Installation on
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Bearing Handling 15.4 Post installa
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Bearing Handling Fig. 15.24 shows t
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Bearing Damage and Corrective Measu
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Technical Data Axial displacement m
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Technical Data 17.4 Fitting surface
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A-100
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INDEX OF BEARING TABLES Deep Groove
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Deep Groove Ball Bearings Open type
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Deep Groove Ball Bearings bearing i
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Deep Groove Ball Bearings D D1 rN r
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Deep Groove Ball Bearings Equivalen
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Expansion Compensating Bearings Da
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Miniature and Extra Small Bearings
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Miniature and Extra Small Ball Bear
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Angular Contact Ball Bearings Angul
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Angular Contact Ball Bearings 2. St
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Single and Duplex Arrangements Db r
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High Speed Single and Duplex Arrang
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Ultra-High Speed Angular Contact Ba
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B-67
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Ceramic Ball Angular Contact Ball B
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Four-Point Contact Ball Bearings QJ
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Double Row Angular Contact Ball Bea
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Double Row Angular Contact Ball Bea
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Self-Aligning Ball Bearings B r ra
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Adapters (for self-aligning ball be
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Adapters (for self-aligning ball be
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Cylindrical Roller Bearings Cylindr
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Cylindrical Roller Bearings 2. Stan
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Cylindrical Roller Bearings ra r1a
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L Type Loose Rib B2 B2 r1 r1 B1 d d
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L Type Loose Rib B2 B2 r1 r1 B1 d d
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Multi-Row Cylindrical Roller Bearin
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Four-Row Cylindrical Roller Bearing
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Tapered Roller Bearings Table 1 (co
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Tapered Roller Bearings Inch Tapere
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Tapered Roller Bearings Inch Tapere
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Tapered Roller Bearings Metric syst
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Tapered Roller Bearings Inch system
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Multi-Row Tapered Roller Bearings O
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Multi-Row Tapered Roller Bearings I
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Multi-Row Tapered Roller Bearings I
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Four Row Tapered Roller Bearings C2
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Spherical Roller Bearings 1. Types,
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Spherical Roller Bearings 5. Adapte
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Spherical Roller Bearings ra Da ra
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Adapter (For spherical roller beari
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Adapter (For spherical roller beari
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Withdrawal Sleeves (For spherical r
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Double Row Angular Contact Thrust B
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Double Row Angular Contact Thrust B
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High Speed Duplex Angular Contact T
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High Speed Duplex Angular Contact T
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Self-Aligning Roller Thrust Bearing
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Locknuts, Lockwashers & Lockplates
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Locknuts Reference withdrawal sleev
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Locknuts Reference bore no. 3 locko
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Nuts Reference withdrawal sleeve no
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Lockwashers Series AW ƒ r2 B2 ƒ1
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Lockwashers Series AWL ƒ r2 B2 ƒ
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Catalog List & Appendix Table
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Catalog List CATALOG TITLES CATALOG
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Appendix Table SI-customary unit co
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