Cylindrial Roller Bearings NU300 Series

Cylindrial Roller Bearings NU300 Series are characterized by moderate thrust-load capacities. They contain cylindrically-shaped roller, which are nevertheless not true cylinders. Instead, they are crowned or end-relieved to reduce stress concentrations. This particular geometry results in low friction and allows high-speed applications. Cylindrical Roller Bearings are commonly available in precision grades such as RBEC-5, a classification from the Roller Bearing Engineers Committee (RBEC). RBEC ratings describe the accuracy and tolerance range of different types of bearings. As a rule, the higher the RBEC number, the tighter the bearing tolerances. Typically, Single Row Roller Bearings NU300 Series are lubricated with oil, which also serves as a coolant.

Most Precision Roller Bearings NU300 Series are made of alloy or low-carbon steels. Some applications require the use of case-hardened or through-hardened, high-carbon, bearing-quality steel. High-carbon grades of steel do not require carburizing and can be case-hardened by induction heating or through-hardened by conventional heating methods. When low-carbon, carburized grades of steel are used, carbon is introduced after the cylindrical roller bearings are machined to a depth sufficient to produce a hardened case that can sustain bearing loads. The addition of carbon and alloys ensures the proper combination of a hard, fatigue-resistant case and a tough, ductile core.

Bearing No.	Boundary dimensions(mm)					Basic load rating(kN)		Limiting speeds(rpm)		Weight(Kg)
	d	D	B	rs min	rs1min	Dynamic(Cr)	Static(Cor)	Grease	Oil
NU304E	20	52	15	1.1	0.6	31.5	26.9	13,000	15,000	0.176
NU305E	25	62	17	1.1	1.1	41.5	37.5	11,000	13,000	0.275
NU306E	30	72	19	1.1	1.1	53	50	9,300	11,000	0.398
NU307E	35	80	21	1.5	1.1	71	71	8,100	9,600	0.545
NU308	40	90	23	1.5	1.5	58.5	57	8,000	9,400	0.658
NU308E	40	90	23	1.5	1.5	83	81.5	7,200	8,500	0.754
NU309	45	100	25	1.5	1.5	74	71	7,200	8,400	0.877
NU309E	45	100	25	1.5	1.5	97.5	98.5	6,500	7,600	0.996
NU310	50	110	27	2	2	87	86	6,500	7,700	1.14
NU310E	50	110	27	2	2	110	113	5,900	6,900	1.3
NU311	55	120	29	2	2	111	111	5,900	7,000	1.45
NU311E	55	120	29	2	2	137	143	5,300	6,300	1.65
NU312	60	130	31	2.1	2.1	124	126	5,500	6,500	1.8
NU312E	60	130	31	2.1	2.1	150	157	4,900	5,800	2.05
NU313	65	140	33	2.1	2.1	135	139	5,100	6,000	2.23
NU313E	65	140	33	2.1	2.1	181	191	4,600	5,400	2.54
NU314	70	150	35	2.1	2.1	158	168	4,700	5,500	2.71
NU314E	70	150	35	2.1	2.1	205	222	4,200	5,000	3.1
NU315	75	160	37	2.1	2.1	190	205	4,400	5,200	3.28
NU315E	75	160	37	2.1	2.1	240	263	4,000	4,700	3.74
NU316	80	170	39	2.1	2.1	190	207	4,100	4,800	3.86
NU316E	80	170	39	2.1	2.1	256	282	3,700	4,400	4.22
NU317	85	180	41	3	3	212	228	3,900	4,600	4.54
NU317E	85	180	41	3	3	291	330	3,500	4,100	4.81
NU318	90	190	43	3	3	240	265	3,700	4,300	5.3
NU318E	90	190	43	3	3	315	355	3,300	3,900	5.72
NU319	95	200	45	3	3	259	285	3,400	4,000	6.13
NU319E	95	200	45	3	3	335	385	3,100	3,600	6.62
NU320	100	215	47	3	3	299	335	3,300	3,800	7.49
NU320E	100	215	47	3	3	380	425	2,900	3,500	8.57
NU321	105	225	49	3	3	320	360	3,100	3,700	8.53
NU322	110	240	50	3	3	360	400	3,000	3,500	10
NU322E	110	240	50	3	3	450	525	2,700	3,100	11.1
NU324	120	260	55	3	3	450	510	2,700	3,200	12.8
NU324E	120	260	55	3	3	530	610	2,400	2,800	13.9
NU326	130	280	58	4	4	560	665	2,500	2,900	17.4
NU326E	130	280	58	4	4	615	735	2,200	2,600	19.4
NU328	140	300	62	4	4	615	745	2,300	2,700	21.2
NU328E	140	300	62	4	4	665	795	2,100	2,400	23.2
NU330	150	320	65	4	4	665	805	2,100	2,500	25.3
NU330E	150	320	65	4	4	760	920	1,900	2,300	28.4

Product Categories : Roller Bearings > Cylindrical Roller Bearings