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RN Series Cylindrical Roller Bearings Without Outer Ring

BWK RN series cylindrical roller bearings are designed without an outer ring, allowing the housing raceway to function directly as the outer raceway. This design provides high radial load capacity while reducing radial installation space.
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  • RN204, RN304, RN25X42.51X12V, RN205, RN30X50.74X14V, RN206, RN306, SZ-201, RN207, RN307, RNN40X57.81X34, RN308, RN309, RN210, RN310, RN211, RN212, RN214

  • BWK

Product Details

Cylindrical Roller Bearings Without Outer Ring

Cylindrical roller bearings without outer ring omit the conventional outer ring. The surrounding housing surface is used directly as the outer raceway, helping reduce the radial cross section of the bearing arrangement.


Structure and Features

  • Compact radial cross section

  • High radial load capacity

  • Housing can function directly as the outer raceway

  • Suitable for space-limited bearing arrangements

  • RN and special RNN configurations available

Series: RN, RNN


Applications

Suitable for compact industrial mechanisms where the housing bore can be precision-machined and hardened to serve as the outer raceway.


RN_Without_Outer_Ring_Section

Technical Data

Shaft Diameter (mm) Current Designation Original Designation d (mm) Ew (mm) B (mm) rsmin (mm) Dynamic Load Cr (N) Static Load Cor (N) Grease Speed (rpm) Oil Speed (rpm) Weight (kg)
20 RN204 502204 20 40 14 1 15800 13100 13800 16400 0.05580

RN304 502304 20 44 15 1.1 21800 17700 11400 13800 0.07970
25 RN25X42.51X12V
25 42.51 12 0.3 20100 21500 11400 13800 0.06951

RN205 502205 25 45 15 1 17000 14900 11400 13800 0.07180
30 RN30X50.74X14V
30 50.74 14 0.3 31000 32500 9400 11300 0.10503

RN206 502206 30 53.5 16 1 23900 22200 9400 11300 0.11210

RN306 502306 30 62 19 1.1 35900 31900 7800 9200 0.19770

SZ-201
30 62 27 1.1 74500 77400 7000 8500 0.31600
35 RN207 502207 35 61.8 17 1.1 31400 28900 8300 9900 0.15640

RN307 502307 35 68.2 21 1.5 46400 43000 7800 9200 0.24560
40 RNN40X57.81X34
40 57.81 34 0.3 75000 111000 6600 7900 0.27890

RN308 502308 40 77.5 23 1.5 58600 56900 6600 7900 0.36050
45 RN309 502309 45 86.5 25 1.5 72900 69900 5900 7000 0.45890
50 RN210
50 80.4 20 1.1 48100 50900 5900 7000 0.28790

RN310 502310 50 95 27 2 88900 88800 5400 6500 0.62270
55 RN211
55 88.5 21 1.5 57900 62200 6000 7100 0.35670
60 RN212 502212 60 97.5 22 1.5 71800 79800 5400 6500 0.49052
70 RN214
70 110.5 24 1.5 82100 93500 4800 5700 0.64570
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RN Series Cylindrical Roller Bearings RN204 RN205 RN206 RN207 RN208 RN210 RN212 RN214 Cylin