Key Features

The ZWZ standard product range includes:

1. NN Type bearings

NN-type double row cylindrical roller bearings have ribbed inner rings and ribless outer rings. Their outer rings and inner assemblies can be mounted separately, without restricting axial displacement of the shaft or housing. These bearings cannot withstand axial loads.
Compared with single-row cylindrical roller bearings of the same radial size, they can carry greater radial loads. They feature a compact design and small deflection under load, making them especially suitable for machine tool spindle supports.

2. NNU Type bearings

NNU-type double row cylindrical roller bearings are equipped with ribbed outer rings and ribless inner rings. They are available in two bore designs: cylindrical bore and tapered bore (marked with the suffix K).
These bearings impose no restrictions on the axial displacement of the shaft or housing, and are not capable of sustaining axial loads. Compared with single-row cylindrical roller bearings of identical radial dimensions, NNU bearings can support significantly higher radial loads.

3. NNCF Type bearings

NNCF-type double row cylindrical roller bearings are designed with three ribs on the inner ring and one rib on the outer ring, enabling axial location in one direction.
On the non-ribbed side of the outer ring, a retaining ring is fitted to keep the bearing assembled as an integral unit.

4. NNCL Type bearings

NNCL‑type double row cylindrical roller bearings feature three ribs on the inner ring and a ribless outer ring.
They are equipped with snap rings on both sides, forming a non‑separable bearing unit.

5. NNCS Type bearings

NNCS‑type double row cylindrical roller bearings have three ribs on the inner ring and a ribless outer ring.
A central locking ring is mounted in the middle of the outer ring, forming a non‑separable bearing.
They allow a certain amount of axial displacement between the shaft and the housing, making them suitable for use as free-end bearings.

Features and benefits

1. High Load Capacity & Enhanced Stability

Double row design significantly improves radial load capacity while maintaining excellent operational stability under heavy-duty conditions.

2. High Rigidity for Precision Applications

Robust internal structure ensures superior stiffness, making it ideal for high-precision equipment such as machine tool spindles.

3. Low Friction & High-Speed Performance

Optimized roller-to-raceway contact reduces friction, allowing higher speeds and improved efficiency.

4. Extended Service Life

Even load distribution minimizes wear and fatigue, resulting in longer service life and reduced maintenance costs.

5. Separable Structure for Easy Installation

Inner and outer rings can be mounted separately, simplifying installation, inspection, and replacement.

6. High Accuracy Grades Available

Available in precision classes such as P5 and P4 to meet demanding industrial requirements.

7. Strong Adaptability to Harsh Conditions

Performs reliably under heavy loads, shock loads, and varying operating environments.

Application Fields

Double Row Cylindrical Roller Bearings are widely used in various industrial fields that require high radial load capacity, high stiffness, and high reliability. Typical applications include: Gearboxes, Motors, Wind Turbines, Construction Machinery, Pumps and Compressors, Material Handling Equipment, Textile Machinery, Railway Vehicles, Metallurgical Equipment, Machine Tool Spindles, Rolling Mills, Mining Machinery, Paper Mills, Marine Propulsion Systems, and Cranes & Hoisting Equipment.

Technical Specifications

NN Series

Bearing No.	d (mm)	D (mm)	B (mm)	Cr (kN)	Cor (kN)	Grease (r/min)	Oil (r/min)	Mass (kg)
NN3010	50	80	23	60.0	85	10000	13000	0.428
NN3010K	50	80	23	60.0	85	10000	13000	0.428
NN3012	60	95	26	77.0	114	9000	10000	0.691
NN3012K	60	95	26	77.0	114	9000	10000	0.691
NN3014	70	110	30	98.5	151	8000	9000	1.06
NN3014K	70	110	30	98.5	151	8000	9000	1.06
NN3016	80	125	34	130	207	4500	5600	1.50
NN3016K	80	125	34	130	207	4500	5600	1.50
NN3018	90	140	37	147	260	5600	6700	1.98
NN3018K	90	140	37	147	260	5600	6700	1.98
NN3020	100	150	37	168	292	5300	6300	2.25
NN3020K	100	150	37	168	292	5300	6300	2.25
NN3024	120	180	46	243	445	4300	5000	3.85
NN3024K	120	180	46	243	445	4300	5000	3.85
NN3026	130	200	52	305	530	2800	3600	5.34
NN3026K	130	200	52	305	530	2800	3600	5.34
NN3028	140	210	53	320	575	2600	3400	6.00
NN3028K	140	210	53	320	575	2600	3400	6.00
NN3030	150	225	56	363	650	3400	4000	7.70
NN3030K	150	225	56	363	650	3400	4000	7.70
NN3032	160	240	60	380	675	3200	3800	8.39
NN3032K	160	240	60	380	675	3200	3800	8.39
NN3034	170	260	67	470	860	2200	3000	12.9
NN3034K	170	260	67	470	860	2200	3000	12.9
NN3036	180	280	74	605	1090	2800	3400	16.9
NN3036K	180	280	74	605	1090	2800	3400	16.9
NN3040	200	310	82	675	1340	1900	2400	22.1
NN3040K	200	310	82	675	1340	1900	2400	22.1
NN3044	220	340	90	875	1610	1800	2200	30.0
NN3044K	220	340	90	875	1610	1800	2200	30.0
NN3048	240	360	92	885	1690	2000	2600	32.7
NN3048K	240	360	92	885	1690	2000	2600	32.7
NN3052	260	400	104	1010	2120	1900	2600	49.2
NN3052K	260	400	104	1010	2120	1900	2600	49.2
NN3056	280	420	106	1170	2290	1800	2200	49.7
NN3056K	280	420	106	1170	2290	1800	2200	49.7
NN3060	300	460	118	1150	2800	1200	1500	75.9
NN3060K	300	460	118	1150	2800	1200	1500	75.9
NN3064	320	480	121	1360	2910	1100	1400	54.9
NN3064K	320	480	121	1360	2910	1100	1400	54.9
NN3068	340	520	133	1730	3780	900	1050	99.5
NN3068K	340	520	133	1730	3780	900	1050	99.5
NN3072	360	540	134	1940	3900	900	1100	105
NN3072K	360	540	134	1940	3900	900	1100	105
NN3076	380	560	140	1640	4280	1300	1500	86.7
NN3076K	380	560	140	1640	4280	1300	1500	86.7
NN3080	400	600	148	2360	4500	950	1000	141
NN3080K	400	600	148	2360	4500	950	1000	141
NN3084	420	620	150	1790	4660	850	1000	152
NN3084K	420	620	150	1790	4660	850	1000	152
NN3092	460	680	163	2600	6200	1000	1200	199
NN3092K	460	680	163	2600	6200	1000	1200	199
NN3096	480	700	165	2270	5800	930	1100	192
NN3096K	480	700	165	2270	5800	930	1100	192
NN30/500	500	720	167	2330	6100	950	1000	221
NN30/500K	500	720	167	2330	6100	950	1000	221
NN30/530	530	780	185	3110	6800	880	950	302
NN30/530K	530	780	185	3110	6800	880	950	302
NN30/560	560	750	190	3190	7900	630	750	245
NN30/560K	560	750	190	3190	7900	630	750	245
NN30/600	600	860	200	3700	11400	560	670	282
NN30/600K	600	860	200	3700	11400	560	670	282
NN30/630	630	920	212	4350	10600	550	750	460
NN30/630K	630	920	212	4350	10600	550	750	460

NNU Series

Bearing No.	d (mm)	D (mm)	B (mm)	Cr (kN)	Cor (kN)	Grease (r/min)	Oil (r/min)	Mass (kg)
NNU4920	100	140	40	195	315	4800	6000	2.15
NNU4920K	100	140	40	195	315	4800	6000	2.15
NNU4924	120	165	45	255	425	4000	5000	3.26
NNU4924K	120	165	45	255	425	4000	5000	3.26
NNU4928	140	190	50	315	550	3600	4500	4.75
NNU4928K	140	190	50	315	550	3600	4500	4.75
NNU4932	160	220	60	420	780	3000	3800	8.50
NNU4932K	160	220	60	420	780	3000	3800	8.50
NNU4936	180	250	69	525	1030	2600	3400	12.2
NNU4936K	180	250	69	525	1030	2600	3400	12.2
NNU4940	200	280	80	645	1310	2200	2800	17.5
NNU4940K	200	280	80	645	1310	2200	2800	17.5
NNU4944	220	300	80	695	1460	2000	2600	19.1
NNU4944K	220	300	80	695	1460	2000	2600	19.1

NNCF Series

Bearing No.	d (mm)	D (mm)	B (mm)	Cr (kN)	Cor (kN)	Grease (r/min)	Oil (r/min)	Mass (kg)
NNCF4916	80	110	30	96.5	148	5000	6300	1.15
NNCF4916K	80	110	30	96.5	148	5000	6300	1.15
NNCF4918	90	125	35	122	199	4500	5600	1.60
NNCF4918K	90	125	35	122	199	4500	5600	1.60
NNCF4920	100	140	40	205	330	4500	5600	2.20
NNCF4920K	100	140	40	205	330	4500	5600	2.20
NNCF4922	110	150	45	230	380	4200	5300	2.70
NNCF4922K	110	150	45	230	380	4200	5300	2.70
NNCF4924	120	165	45	255	425	4000	5000	3.26
NNCF4924K	120	165	45	255	425	4000	5000	3.26
NNCF4926	130	180	50	302	510	3600	4500	4.00
NNCF4926K	130	180	50	302	510	3600	4500	4.00
NNCF4928	140	190	50	315	550	3600	4500	4.75
NNCF4928K	140	190	50	315	550	3600	4500	4.75

NNCL Series

Bearing No.	d (mm)	D (mm)	B (mm)	Cr (kN)	Cor (kN)	Grease (r/min)	Oil (r/min)	Mass (kg)
NNCL4916	80	110	30	96.5	148	5000	6300	1.15
NNCL4916K	80	110	30	96.5	148	5000	6300	1.15
NNCL4918	90	125	35	122	199	4500	5600	1.60
NNCL4918K	90	125	35	122	199	4500	5600	1.60
NNCL4920	100	140	40	195	315	4800	6000	2.15
NNCL4920K	100	140	40	195	315	4800	6000	2.15
NNCL4922	110	150	45	230	380	4200	5300	2.70
NNCL4922K	110	150	45	230	380	4200	5300	2.70
NNCL4924	120	165	45	255	425	4000	5000	3.26
NNCL4924K	120	165	45	255	425	4000	5000	3.26

NNCS Series

Bearing No.	d (mm)	D (mm)	B (mm)	Cr (kN)	Cor (kN)	Grease (r/min)	Oil (r/min)	Mass (kg)
NNCS4916	80	110	30	96.5	148	5000	6300	1.15
NNCS4916K	80	110	30	96.5	148	5000	6300	1.15
NNCS4918	90	125	35	122	199	4500	5600	1.60
NNCS4918K	90	125	35	122	199	4500	5600	1.60
NNCS4920	100	140	40	195	315	4800	6000	2.15
NNCS4920K	100	140	40	195	315	4800	6000	2.15
NNCS4922	110	150	45	230	380	4200	5300	2.70
NNCS4922K	110	150	45	230	380	4200	5300	2.70
NNCS4924	120	165	45	255	425	4000	5000	3.26
NNCS4924K	120	165	45	255	425	4000	5000	3.26