# Updates for the SKF catalogue Rolling bearings

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Section F - Design considerations
Page 174 - Table 4
 Explanation: A housing tolerance of J6 provides a transition fit. Correct: J65)    In most cases, can be displaced

Page 203
 Explanation: The unit for the taper is the slope, not degree. Correct: where Δk = the permissible deviation of the slope of the taper __ Vk = the permissible range of dispersion of the slope of the taper __

Page 214

 Explanation: The internal clearance reduction should be calculated using the bearing mean diameter. Correct: Δrtemp = α dm ΔT dm = bearing mean diameter [mm]      = 0,5 (d + D)
Section G - Lubrication
Page 251 - Table 4
 Explanation: Three symbols for the grease characteristics must be changed. Correct: LGGB2 – Rust inhibiting properties  o  (not +) LGLT2 – Rust inhibiting properties  o  (not +) LGHP2 – Severe vibration  o  (not +)
Section 1 - Deep groove ball bearings
Page 318 - Permissible speeds
 Explanation: The permissible speed for grease lubricated bearings with a ring centred cage should be lower. Correct: SKF recommends oil lubrication for bearings with a ring centred cage (designation suffix MA or MB). When these bearings are grease lubri­cated (→Lubrication, page 239) the speed factor is limited to A ≤ 250 000 mm/min.
Section 3 - Angular contact ball bearings
Page 516
 Explanation: The basic load ratings, the fatigue load limit and the speed ratings for bearing 7221 BECBM are too low. Correct: 105   190   36   156   150   5,2   4 300   4 300   *7221 BECBM

Page 518

 Explanation: The basic load ratings, the fatigue load limit and the speed ratings for bearings 7322 BECBM and 7322 BCBP are too low. Correct: 240   50  240   245   7,8   3 600   3 600  *7322 BECBM 240   50  240   245   7,8   3 600   3 600  *7322 BECBP
Section 5 - Cylindrical roller bearings
Page 626
 Explanation: The basic load ratings and the fatigue load limit for bearing NJ 422 are too high. Correct: 110    280    65    523    585      64    2 600    3 200    NJ 422

Page 642

 Explanation: NUH 2248 bearings have an outer diameter of 440 mm. Correct: 240    440    ...    NUH 2248 ECMH           440    ...    NUH 2248 ECMH/PEX
Section 6 - Needle roller bearings
Page 736
 Explanation: Product BK 2020 is single row and should not be marked with a footnote. Correct:      26    20    15,1    26,5      3,15    12 000    14 000    BK 2020
Section 7 - Tapered roller bearings
Page 813, table 5
 Explanation: Some formulae are wrong because indices are mixed up. Correct: Load cases 1a and 1b, axial load FaA Load case 2a, axial loads FaA and FaB Load case 2b, condition Ka
Section 8 - Spherical roller bearings
Page 885
 Explanation: Diagram is only valid for up to a maximum relation of Fa/Fr. Correct: The diagram is valid for bearings in light to normal load applications (P ≤ 0,1 C) on a horizontal shaft and a load ratio Fa/Fr ≤ e.
Section 13 - Spherical roller thrust bearings

Page 1080
 Explanation: The last sentence under Misalignment could be more clear. Correct: When designing bearing arrangements with rotating housing washer in combination with misalignment or when the shaft wobbles in relation to the housing, contact the SKF application engineering service.

Page 1081
 Explanation: The title for table 1 needs an extension. Correct: Table 1 Permissible angular misalignment for rotating shafts

Page 1086
 Explanation: Under Axial clearance, bearings with designation suffix VU029 should be mentioned. Correct: ... For these applications, bearings with a modified shaft washer (designation suffix VU029) should be used. Small axial clearance enables simple and cost-effective bearing arrangements e. g. for ...

Page 1089
 Explanation: In the designation system, add VU029 under Group 4.6. Correct: VU029    Shaft washer modified for applications with small                axial clearance
Section 14 - Track runner bearings
Page 1114
 Explanation: Single row cam rollers follow ISO dimension series 02. Correct: Dimension standards   ISO 15, dimension series 02, except ...
Section 16 - Bearing accessories
Pages 1304 and 1306
 Explanation: The dimension B is listed in the table, but not shown in the sketch. Correct:  Add the lock nut width B to the ilustration. B is the lock nut width without the locking device.

Pages 1304 to 1309

 Explanation: The column headings B and B1 are in the wrong place. They must change place. Correct: d1     d     d3     B1     B     B4     G     ...

Page 1320

 Explanation: HME 3180 and HM 3180 lock nuts are not listed with the correct spanner. Correct: HME 3180 TMFN 64-80 HM 3180   TMFN 64-80

Page 1337
 Explanation: KMT 24, 32 and 40 lock nuts are not listed with the correct spanner. Correct: KMT 24   HN 21-22 KMT 32   TMFN 23-30 KMT 40   TMFN 30-40