Double Row Cylindrical Roller Bearings

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Introduction

Cylindrical roller bearings have a large load capacity and mainly bear radial loads. Its structure is simple, including cylindrical rolling elements, inner rings, outer rings, and retainers. Single-row cylindrical roller bearings are the most basic type. Its different structures are reflected in the different designs of the ribs. Common basic cylindrical roller bearing types include N NU, NJ NF, and NUP.

The following chart is a simple summary of the comparison of the different rib types for cylindrical roller bearings.

Type	Inner Ring	Outer Ring	Axial Displacement	Axial Load
N	Double Rib	No Rib	Large	None
NU	No Rib	Double Rib	Large	None
NJ	Double Rib	Single Rib	Limited	Small One-Way
NF	Double Rib	Single Rib	Poor	Large One-Way
NUP	Single Rib + Loose Ring	Double Rib	Restricted	Two-Way

Inquiry	Bearing NO.		Boundary dimensions(mm)					Basic load ratings(kN)		Limiting speed(rpm)	Abutment and fillet dimensions(mm)				Weight (kg)
Inquiry	Cylindrical bore	Tapered bore	d	D	B/C	r 1.2min	r3.4min	Cr	Cor	Speed Ratings	da max	Da max	ra max	rb max	Refer
	NN4826	-	130	165	35	1	1	107	238	5000	138	156	1	1	1.82
	NN3926	NN3926K	130	180	37	1.5	1.5	173	325	4800	141	168	1.5	1.5	2.59
	NNU4926	NNU4926K	130	180	50	1.5	1.5	187	390	4800	144	172	1.5	1.5	3.85
	NN4926	NN4926K	130	180	50	1.5	1.5	187	390	4800	141	169	1.5	1.5	3.84
	NN3026	NN3026K	130	200	52	1.1	2	284	475	4500	-	190	2	2	5.75
	NNU3026	NNU3026K	130	200	52	2	2	284	475	4500	142	187	2	2	5.92
	NNU3126	-	130	210	64	2	2	360	580	2800	142	196	2	2	8.49
	NNU4126	NNU4126K30	130	210	80	2	1.1	561	965	2800	148	200	2	2	10.5
	NN3928	NN3928K	140	190	37	1.5	1.5	201	375	4500	151	179	1.5	1.5	2.78
	NNU4928	NNU4928K	140	190	50	1.5	1.5	190	400	4500	154	182	1.5	1.5	4.1
	NN4928	NN4928K	140	190	50	1.5	1.5	190	400	4500	151	179	1.5	1.5	4.07
	NN3028	NN3028K	140	210	53	2	2	297	520	4300	-	200	2	2	6.2
	NNU3028	-	140	210	53	2	2	297	520	4300	152	196	2	2	6.38
	NN3128	-	140	225	68	2.1	2.1	400	650	2600	155	209	2	2	10.1
	NNU3128	-	140	225	68	2.1	2.1	400	650	2600	155	209	2	2	10.3
	NNU4128	NNU4128K30	140	225	85	2.1	2.1	627	1040	2600	158	214	2	2	13
	NN4830	NN4830K	150	190	40	1.1	1.1	194	450	4500	-	182.5	1	1	2.75
	NN3930	NN3930K	150	210	45	2	2	262	490	4300	163	196	2	2	4.47
	NNU4930	NNU4930K	150	210	60	2	2	330	655	4300	166	200	2	2	6.25
	NN4930	NN4930K	150	210	60	2	2	330	655	4300	163	196	2	2	6.36
	NN3030	NN3030K	150	225	56	2.1	2.1	330	570	4000	-	214	2	2	7.5
	NNU3030	-	150	225	56	2.1	2.1	330	570	4000	165	209	2	2	7.81
	NN3130	-	150	250	80	2.1	2.1	535	860	2400	165	234	2	2	15.4
	NNU4130	NNU4130K30	150	250	100	2.1	2.1	748	1290	2400	174	239	2	2	18
	NN4832	-	160	200	40	1	1	150	355	4000	169	191	1	1	2.95
	NN3932	NN3932K	160	220	45	2	2	271	520	4000	173	206	2	2	5.02
	NNU4932	NNU4932K	160	220	60	2	2	330	680	4000	176	210	2	2	6.6
	NN4932	NN4932K	160	220	60	2	2	330	680	4000	173	206	2	2	6.77
	NN3032	NN3032K	160	240	60	2.1	2.1	369	655	3800	-	229	2	2	9.1
	NNU3032	-	160	240	60	2.1	2.1	369	655	3800	175	224	2	2	9.48
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