Page 313 - needle bearings

Linear flat rollers
NTN

Type BF
Type RF

3'ܗ #'ܗ

DW 3ʙ7mm

Boundary dimensions Basic load ratings 3) Bearing Abutment Mass 4)
dynamic static dynamic static numbers dimensions
mm N kgf mm kg

1) 2)
Dw b L1 Lw l a Cr Cor Cr Cor E H (approx.)
0
3 20 705 13.8 6 4.5 34 000 88 500 3 450 9 000 RF3020/705 20.4 ʴ0.1 2.7 ʵ0.2 0.015
0
0
3 20 1 000 15.8 6 5 38 000 102 000 3 850 10 400 BF3020/1000 20.4 ʴ0.1 2.7 ʵ0.2 0.037
0
0
5 23 1 000 19.8 8 8 87 000 211 000 8 850 21 500 BF5023/1000 23.4 ʴ0.1 4.7 ʵ0.2 0.054
0
0
5 32 1 000 27.8 8 8 114 000 299 000 11 600 30 500 BF5032/1000 32.4 ʴ0.1 4.7 ʵ0.2 0.073
0
7 28 1 000 24 11 10.5 155 000 355 000 15 800 36 000 BF7028/1000 28.5 ʴ0.1 6.7 0 0.091
0 ʵ0.2
7 35 1 000 30 11 10.5 185 000 445 000 18 900 45 500 BF7035/1000 35.5 ʴ0.1 6.7 0 0.110
0 ʵ0.2

Note 1) The dimensional tolerance for needle roller diameter Dw is 0 to -2 Жm.
2) The standard length L1 of the cage shall be 1000 mm for Type BF and 705 mm for Type RF.
Where special cage length is required, the nominal bearing number is followed by the numerical length value as exemplified below.
Ex. Where L1 = 500 mm is required for BF3020, BF302/500
3) The listed basic load ratings are subject to use of 10 flat rollers. Calculate the basic load ratings for any optional cage length L1 by the
following formula.
7/9
C = f1 ɾCr
C0 = f1ɾC0r
Herein, f1=0.1 (L1ʴlʵ2a) / l
4) The listed weights are subject to L1 = 100 mm.
Remarks: For Type BF
1. On occasion, the length of an ordered unit could be shorter by l dimension shown in each Dimensions Table because the roller and
cage assy is cut at the minimum unit of each pocket so as to match the required length.
2. Where this bearing unit is used frequently at various lengths, it is more economical to cut the standard bearing of 1000 mm length to
each desired length at your side.

B-251