Needle Roller Bearings Without Inner Ring

BWK needle roller bearings without an inner ring use a hardened and ground shaft surface as the raceway, enabling a compact radial design and a larger shaft diameter.

Availability:

Quantity:



Inquire Add to Basket

Model:
RNAO5X15X8TN1, NK6/10TN1, RNAO6.05X12X7TN1, VL6.8, VL7.8/1, NK8/12/P6S1, NK8/12TN1, RNAO8X15X13.5, RNAO8X19X9/YA1, NK10/12, RNA59/7, RNA49/8, NK12/12, RNA59/8, RNA49/9, RNAO12X24X9.8
Brand:
BWK

Product Details

Needle Roller Bearings Without Inner Ring

Needle roller bearings without an inner ring are preferred when the shaft can be hardened and ground to serve directly as the rolling raceway. Eliminating the inner ring reduces radial installation space while retaining high load capacity.

Structure and Features

No separate inner ring required
Compact radial cross section
High radial load capacity
Allows a larger shaft diameter
Wide RNA, NK and RNAO series range

Series: RNA, NK, RNAO

Applications

Suitable for automotive transmissions, gearboxes, machine tools, pumps, compressors and compact industrial mechanisms with prepared shaft raceways.

微信图片_20260825223547_119_21

Technical Data

Shaft Diameter (mm)	Current Designation	Original Designation	Fw (mm)	D (mm)	C (mm)	Dynamic Load Cr (N)	Static Load Cor (N)	Grease Speed (rpm)	Oil Speed (rpm)	Weight (kg)
5	RNAO5X15X8TN1	SZ-449TN1	5	15	8	1900	1600	23000	34000	0.008
6	NK6/10TN1		6	12	10	2800	2500	22000	32000	0.0052
6.05	RNAO6.05X12X7TN1		6.05	12	7	2100	1700	22000	32000	0.00321
6.8	VL6.8		6.8	14.7	9	3600	2700	17400	29000	0.0064
7.8	VL7.8/1		7.8	16	9	4220	2820	17400	29000	0.00758
8	NK8/12/P6S1		8	15	12	4200	4400	19000	29000	0.0101
8	NK8/12TN1		8	15	12	4200	4400	19000	29000	0.00952
8	RNAO8X15X13.5	SZ-E402	8	15	13.5	4300	5200	19000	29000	0.011
8	RNAO8X19X9/YA1	SZ-448	8	19	9	3700	3100	19000	29000	0.0125
10	NK10/12	624097	10	17	12	3800	3900	17200	24800	0.01
10	RNA59/7	5624097	10	17	15	4900	5400	17200	24800	0.013
10	RNA49/8	4624098	10	19	11	3500	3000	17200	24800	0.0137
12	NK12/12	644079	12	19	12	6800	6300	15300	23200	0.01514
12	RNA59/8	5624098	12	19	15	5600	6600	15300	23200	0.014
12	RNA49/9	4624099	12	20	11	3700	3900	15300	23200	0.0117
12	RNAO12X24X9.8	824078	12	24	9.8	4700	5300	15300	23200	0.0204
14	RNA142117B	5844900K	14	21	17	13700	20100	14400	21600	0.0167
14	RNA4900A	4624900	14	22	13	4900	5800	14400	21600	0.017
14	NK14/16A	4624900K	14	22	16	6200	7900	14400	21600	0.021
14	RNAO14X30X11.8	824700	14	30	11.8	8500	9100	14400	21600	0.0462
15	RNA152117B	5844801	15	21	17	6400	10300	13500	20700	0.0173
15	NK15/16	RNA152316	15	23	16	10600	13900	13500	20700	0.0218
15	NK15/20		15	23	20	12600	17400	13500	20700	0.0267
15	RNA152512		15	25	12	8200	9000	13500	20700	0.03
15	RNA162220		16	22	20	12000	19200	13500	20700	0.0193
15	RNA162322		16	23	22	13900	20400	13500	20700	0.02797
16	RNA4901		16	24	13	5300	6700	13500	20700	0.018
16	NK16/20A	624701	16	24	20	9000	13300	13500	20700	0.027
16	RNAO162615/YA	SZ-440	16	26	15	5500	7000	13500	20700	0.0234
16	RNAO162624/YA	SZ-441	16	26	24	5500	7000	13500	20700	0.0308
17	RNAO172513	RNAF172513	17	25	13	12100	19600	13300	19400	0.0214
17	NK17/16		17	25	16	11900	16600	13300	19400	0.024
17	NK17/20	RNA172520	17	25	20	14800	22100	13300	19400	0.03
17	RNA173012		17	30	12	10200	10200	12400	18000	0.0344
17	SZ-492		17	31	18	13500	15300	12400	18400	0.0619
18	RNAO182814/YA	SZ-442	18	28	14	6000	8100	13000	19300	0.029
19.05	RNAO19.05X28X18/YA	SZ-445	19.05	28	18	5700	7700	12400	18400	0.0467
20	RNA4902A	4624902	20	28	13	6100	8600	12000	18000	0.022
20	RNA4902A/P6	E4624902	20	28	13	6100	8600	12000	18000	0.0223
20	NK20/16	644802	20	28	16	12100	17800	12000	18000	0.027
20	NK20/20		20	28	20	16600	23700	10800	18000	0.03796
20	RNA203212		20	32	12	11000	11600	12000	18000	0.031
20	RNA4002/S1	4644102T	20	32	17	14200	17600	12000	18000	0.044
20	RNA203312		20	33	12	11300	14400	12000	18000	0.0713
20	SZ-493		20	34	18.5	15500	21100	9600	14400	0.07748
21	NK21/16		21	29	16	12600	19000	11700	17400	0.0285
22	RNA4903	4624903	22	30	13	9200	13500	10000	16000	0.0255
22	NK22/16		22	30	16	12500	19100	10000	16000	0.0295
22	NK22/20		22	30	20	17200	25500	10000	16000	0.0369
22	NK22/20/SO	NK22/20T	22	30	20	15800	25800	10000	16000	0.037

Technical Data 2

Shaft Diameter (mm)	Current Designation	Original Designation	Fw (mm)	D (mm)	C (mm)	Dynamic Load Cr (N)	Static Load Cor (N)	Grease Speed (rpm)	Oil Speed (rpm)	Weight (kg)
22	RNA6903	6634903	22	30	23	17900	31500	9600	16000	0.0435
22.225	NCS1412		22.225	34.925	19.05	22400	26300	9600	16000	0.0646
24	NK24/16		24	32	16	13300	21500	10000	15000	0.032
25	NK25/20	644804(SZ-434)	25	33	20	21200	30400	9600	14400	0.0413
25	RNA253330	64480K	25	33	30	25000	48600	9600	14400	0.063
25	RNA253826		25	38	26	38700	54100	9600	14400	0.091
25	RNA253525A	6624704	25	35	25	19300	30800	9600	14400	0.062
25	RNA4904	4624904	25	37	17	23300	28600	9600	14400	0.05777
25	RNA4904TN1		25	37	17	22400	27300	9600	14400	0.05195
25	RNA4904/P5	SZ-D420	25	37	17	20600	27700	9600	14400	0.057
25	RNA253720		25	37	20	24000	29700	8400	14000	0.06661
25.4	NCS1616		25.4	38.1	25.4	30700	40800	8400	14000	0.10269
26	NK26/16		26	34	16	13300	21900	9300	14000	0.032
26	NK26/20		26	34	20	18700	30100	9300	14000	0.04462
26	RNA264222	4644104K	26	42	22	20600	27800	9300	14000	0.1134
27.026	X-0921		27.026	42.862	25.4	45800	56300	9300	14000	0.1291
27.026	NK28/20		28	37	20	19400	32200	9100	13600	0.053
28	RNA49/22		28	39	17	24000	30300	5160	13600	0.0504
28	RNA284519A	RNA284519	28	45	19	12100	19900	9100	13600	0.1231
28.1	RNA28.14238	SZ-410	28.1	42	38	40300	67500	9100	13600	0.159
28.575	NCS1816		28.575	41.275	25.4	32400	45300	5160	13600	0.1012
29	RNA294535/YA1		29	45	35	54000	76700	9100	13600	0.1779
30	NK30/20	644805	30	40	20	23900	38000	8500	12400	0.0643
30	RNA304023		30	40	23	25600	41200	8500	12400	0.07397
30	RNA4905A	4624905	30	42	17	12000	17700	8500	12400	0.061
30	RNA304222		30	42	22	31600	44700	7440	12400	0.08784
30	6624905		30	42	30			7440	12400	0.1193
31.75	NCS2016		31.75	44.45	25.4	32800	47500	7440	12400	0.1082
32	NK32/20A	624705	32	42	20	16700	27600	8000	11900	0.068
32	RNA325035		32	50	35	74100	95200	8000	11900	0.2153
32.79	RNA32.79X49.212X28.575	TR921	32.79	49.212	28.575	82900	61200	7800	11600	0.19
32.79	R-0921		32.79	49.212	28.575	59100	79400	7800	11600	0.176
34	RNA345035	SZ-419	34	50	35	57000	85400	7500	11200	0.192
35	NK35/20	644806	35	45	20	21100	38500	7300	10800	0.074
35	NK35/30	RNA354530	35	45	30	33800	70900	7300	10800	0.1091
35	RNA4906A	4624906	35	47	17	13300	24100	7300	10800	0.07
35	RNA4906		35	47	17	27100	38500	7300	10800	0.07243
35	RNA354722		35	47	22	30900	45400	7300	10800	0.09558
35	RNA354830		35	48	30	41300	68800	7300	10800	0.1364
35	RNA355132	644907	35	51	32	58600	83600	7300	10800	0.1953
38	NK38/20		38	48	20	27100	48600	7300	10800	0.08659
38	RNA385538		38	55	38	76100	113800	6700	10000	0.2605
38.125	Q-0921		38.125	58.978	31.75	83000	104800	6700	10000	0.2821
40	NK40/20	RNA405020	40	50	20	26000	47000	6400	9500	0.083
40	NK40/30	RNA405030	40	50	30	34800	77200	6400	9500	0.119
40	RNA49/32	46449/32	40	52	20	28800	48600	6400	9500	0.088
40	RNA49/32/P6	E46249/32	40	52	20	26600	29900	6400	9500	0.0877
40	RNAO405317	824707	40	53	17	25800	42200	6400	9500	0.067
40	NKS40	RNA405522	40	55	22	33600	54700	6400	9500	0.129
41.173	F-45087		41.173	64.292	21.08	49300	57600	6100	9100	0.22242

Technical Data 3

Shaft Diameter (mm)	Current Designation	Original Designation	Fw (mm)	D (mm)	C (mm)	Dynamic Load Cr (N)	Static Load Cor (N)	Grease Speed (rpm)	Oil Speed (rpm)	Weight (kg)
42	RNA4907A	4624907	42	55	20	21600	37200	6100	9100	0.107
42	RNA426532	34108K	42	65	32	84100	109900	6100	9100	0.351
43	NK43/20	RNA435320	43	53	20	28900	54300	6000	8900	0.0888
44	RNA4007	4644107K	44	62	27	36900	61300	5800	8600	0.2518
44.45	RNA44.45X58.7X19.17		44.45	58.7	19.17	28400	45000	5160	8600	0.1269
44.45	RNA455522A	624708	45	55	22	22600	46000	5700	7650	0.1008
44.45	RNA455522/AS	624708K	45	55	22	22600	46000	5700	8400	0.1008
44.45	NK45/20	644808	45	55	20	26300	49200	5700	8400	0.092
44.45	NK45/30	RNA455530	45	55	30	40700	86100	5700	8400	0.139
44.45	RNA456540		45	65	40	89500	132200	5700	8400	0.3894
48	RNA4908A	4624908	48	62	22	26400	50800	5400	8000	0.14
50	NK50/25		50	62	25	39000	75100	5000	6700	0.27
50	NK50/35	SZ-414	50	62	35	52000	108800	5000	7600	0.221
50	RNA506525		50	65	25	45500	71400	5000	7600	0.2204
50.8	SZ-477		50.8	65.088	22.225	35400	69400	5000	7600	0.169
51	RNA516520		51	65	20	37900	69100	5000	7500	0.1425
52	RNA4909		52	68	22	46100	73800	4900	7300	0.182
55	RNA556720		55	67	20	38000	68900	4900	7300	0.12259
56.642	F211167.1		56.642	74.6	22.225	49500	82400	3960	6600	0.25246
58	RNA4910	4644910	58	72	22	35300	65900	4400	6600	0.163
60	NK60/25	RNA607225	60	72	25	47400	94000	4300	6400	0.185
65	NK65/35	SZ-415	65	78	35	55800	134700	4000	5900	0.31
66.642	RNA66.64X74.6X22.225	F211167.1	66.642	74.6	22.225	50300	84900	3500	5300	0.25246
68	NK68/25/P6	E644812	68	82	25	42100	94300	3800	5600	0.241
70	NK70/25/P6	E644912	70	85	25	46000	96200	3600	5400	0.26
70	NK70/35		70	85	35	62700	142800	3600	6000	0.37
80	RNA4914A	4624914	80	100	30	533000	121000	3200	4800	0.46
80	NK80/25/P6	E644814	80	95	25	58200	124800	3200	4800	0.301
80	NK80/35	RNA809535	80	95	35	79800	187200	3200	4800	0.4376
95	NK95/36		95	115	36	95500	216800	2700	4000	0.67
96	RNA9611529/P6	SZ-E421	96	115	29	90500	203300	2700	4000	0.4841
96	RNA9611529	SZ-421	96	115	29	87500	194400	2700	4000	0.484
110	RNA4919/P6		110	130	35	112400	261600	2300	3500	0.782
110	RNA4919A	4624919	110	130	35	112400	261600	2300	3500	0.7819

needle roller bearing without inner ring RNA needle bearing NK needle bearing compact radial bearing BWK Bearing

Needle Roller Bearings Without Inner Ring

Needle Roller Bearings Without Inner Ring

Structure and Features

Applications

Technical Data

Related Products