NNU49 Series

Features of NNU49 Series

The main dimensions are in accordance with the standard DIN5412-4, floating bearing, double row, separable, with cage, and smaller radial internal clearance.

Applications

The scope of application is wide. Our products survive by quality, develop by reputation, and win the market by service.

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Parameter Introduction Quality Standard

Parameter

Bearing Type	Main Dimensions and Performance Data										Dimensions					Installation Size					Temperature Range
LYLKWE	d	D	B	Cr	Cor	Cur	nG	Ng Grease	nG Oil		r1 min	s	F	ns	ds	da min	ra1 max	da	Da	Da max	Tmin	Tmax
LYLKWE	Aperture（mm）	Outer Diameter（mm）	Width（mm）	Basic Dynamic Load Rating, Radial（N）	Basic Static Load Rating, Radial（N）	Upper Limit of Radial Fatigue（N）	Upper Limit Speed（1/min）	Grease Lubrication Upper Limit Speed（1/min）	Oil Lubrication Upper Limit Speed（1/min）	Weight（kg）	Chamfer Size（mm）	Axial Displacement（mm）	Raceway Diameter Inner Ring（mm）	Lubrication Groove Width（mm）	Diameter Lubrication Hole（mm）	Shoulder Diameter（mm）	Groove Radius（mm）	Diameter Shoulder Clearance	Shoulder Diameter Outer Ring Clearance	The Diameter of the Shell Shoulder（mm）	Low Working Temperature	High Working Temperature
NNU4920-S-M-SP	100	140	40	128000	255000	33500	6700	5700	6700	1.855	1.1	2	113	6.5	3.2	112	1	h12	H12	129	-30℃	150℃
NNU4921-S-M-SP	105	145	40	130000	260000	34500	6500	5500	6500	1.93	1.1	2	118	6.5	3.2	117	1	h12	H12	134	-30℃	150℃
NNU4922-S-M-SP	110	150	40	132000	270000	35000	6300	5400	6300	1.999	1.1	2	123	6.5	3.2	122	1	h12	H12	129	-30℃	150℃
NNU4924-S-M-SP	120	165	45	175000	340000	41000	5600	4750	5600	2.726	1.1	2.3	134.5	6.5	3.2	133.4	1	h12	H12	154.5	-30℃	150℃
NNU4926-S-M-SP	130	180	50	188000	385000	45500	5300	4450	5300	3.743	1.5	2.7	146	6.5	3.2	144.7	1.5	h12	H12	166	-30℃	150℃
NNU4928-S-M-SP	140	190	50	190000	400000	46000	5000	4250	5000	3.971	1.5	2.7	156	6.5	3.2	155.1	1.5	h12	H12	176	-30℃	150℃
NNU4930-S-M-SP	150	210	60	330000	650000	82000	4200	3550	4200	6.208	2	2.7	168.5	6.5	3.2	167.2	2	h12	H12	196.5	-30℃	150℃
NNU4932-S-M-SP	160	220	60	335000	680000	84000	4000	3400	4000	6.398	2	2.7	178.5	6.5	3.2	177.2	2	h12	H12	206.5	-30℃	150℃
NNU4934-S-M-SP	170	230	60	340000	700000	86000	3850	3300	3850	6.818	2	2.7	188.5	6.5	3.2	187.2	2	h12	H12	216.5	-30℃	150℃
NNU4936-S-M-SP	180	250	69	405000	860000	104000	3550	3000	3550	9.798	2	3.2	202	9.5	4.8	200.5	2	h12	H12	232	-30℃	150℃
NNU4938-S-M-SP	190	260	69	410000	880000	106000	3450	2900	3450	11.375	2	3.2	212	9.5	4.8	210.5	2	h12	H12	242	-30℃	150℃
NNU4940-S-M-SP	200	280	80	490000	1040000	125000	3200	2700	3200	14.783	2.1	4.3	225	12.2	6.3	223	2.1	h12	H12	259	-30℃	150℃
NNU4944-S-M-SP	220	300	80	510000	1140000	133000	3000	2550	3000	14.79	2.1	4.3	245	12.2	6.3	243	2.1	h12	H12	279	-30℃	150℃
NNU4948-S-M-SP	240	320	80	530000	1210000	138000	2800	2400	2800	25.6	2.1	4.3	265	12.2	6.3	263	2.1	h12	H12	299	-30℃	150℃
NNU4952-S-M-SP	260	360	100	750000	1690000	190000	2430	2070	2430	40	2.1	5.4	292	15	8	289.4	2.1	h12	H12	334	-30℃	150℃
NNU4956-S-M-SP	280	380	100	770000	1790000	198000	2320	1970	2320	44	2.1	5.4	312	15	8	309.4	2.1	h12	H12	354	-30℃	150℃
NNU4960-S-M-SP	300	420	118	1040000	2380000	265000	2040	1740	2040	50.9	3	6.3	339	17.7	9.5	336	2.5	h12	H12	389	-30℃	150℃
NNU4964-S-M-SP	320	440	118	1070000	2550000	275000	1960	1670	1960	51.41	3	6.3	359	17.7	9.5	356	2.5	h12	H12	409	-30℃	150℃
NNU4968-S-M-SP	340	460	118	1100000	2650000	290000	1890	1600	1890	54.6	3	6.3	379	17.7	9.5	376	2.5	h12	H12	429	-30℃	150℃
NNU4972-S-M-SP	360	480	118	1130000	2800000	300000	1820	1540	1820	56.8	3	6.3	399	17.7	9.5	396	2.5	h12	H12	449	-30℃	150℃
NNU4976-S-M-SP	380	520	140	1440000	3600000	375000	1620	1380	1620	85.04	4	7.2	426	17.7	9.5	422.6	3	h12	H12	482	-30℃	150℃
NNU4980-S-M-SP	400	540	140	1490000	3800000	390000	1570	1330	1570	89.11	4	7.2	446	17.7	9.5	422.6	3	h12	H12	502	-30℃	150℃
NNU4984-S-M-SP	420	560	140	1530000	4000000	405000	1520	1290	1520	93.36	4	7.2	466	17.7	9.5	462.6	3	h12	H12	522	-30℃	150℃
NNU4988-S-M-SP	440	600	160	2040000	5200000	530000	1360	1150	1360	128.54	4	6.8	490	17.7	9.5	486.8	3	h12	H12	558	-30℃	150℃
NNU4992-S-M-SP	460	620	160	2110000	5500000	560000	1320	1120	1320	132.6	4	6.8	510	17.7	9.5	506.8	3	h12	H12	578	-30℃	150℃
NNU4996-S-M-SP	480	650	170	2350000	6100000	610000	1250	1060	1250	155.79	5	7.2	534	17.7	9.5	530.6	4	h12	H12	606	-30℃	150℃
NNU49/5000-S-M-SP	500	670	170	2330000	6100000	600000	1220	1030	1220	161.23	5	7.2	554	17.7	9.5	550.6	4	h12	H12	626	-30℃	150℃

Quality Standard

Rockewell Bearings has added parameters that are not defined by ISO/ABEC for customers, including preload tolerances, functional tests, traceability and micron codes, cleanliness, raceway curvature, balls, etc. and roundness, surface processing (function And non-functional surfaces), steel specifications, cage trim and design, and installation chamfering. The definition of these parameters improves the quality of precision angular contact ball bearing products, thereby improving the performance of machine tool spindles.
The element of precision angular contact ball bearings is the cage, which is very important for machine tool bearings. The performance of the cage will affect the stability of machine tool bearings under high-speed rotation. The standard cage produced by Rockewell is made of phenolic resin. The internal design and the tolerance of the pocket gap are tight and the guide surface is controlled to ensure the stability of the cage during high-speed operation, lubrication and dynamic load.
The two elements of precision angular contact ball bearings are cleanliness, which is very important for precision angular contact ball bearings. Generally, the parts of the bearing products must be cleaned with a multi-solvent for 3 hours to prevent impurities from entering the bearing and prevent inherent pollution sources. In addition, the non-working surface of the bearing must be ground to ensure that the bearing is free of impurities before leaving the factory. Therefore, the bearing products produced by Rockewell can increase the normal operating time of the machine tool.
There are two main structural design methods for precision angular contact ball bearings: the high-rigidity WI series and the high-speed HX series to meet the requirements of different applications. The basic, open Rockewell bearing design has a higher spindle speed and greater dynamic radial stiffness, so the spindle can cut more material in a shorter time while ensuring excellent finished product tolerances. These improvements are attributed to the combination of the ball body and the precision engineering design of the raceway profile, which improves the processing rate.

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