Custom NF300 Series Cylindrical Roller Bearings Manufacturers, Factory

NF300 Series

NF series cylindrical roller bearing is a rolling bearing widely used in mechanical transmission and equipment, with high load-bearing capacity and rigidity. This series of bearings is mainly composed of an inner ring, an outer ring and rollers. The cylindrical shape of the rollers enables them to withstand large radial loads and have low friction during high-speed operation. NF series bearings are particularly suitable for applications requiring high precision and stability, such as motors, reducers and industrial machinery. It is also designed for ease of installation and maintenance, effectively extending the service life of the equipment. In addition, the diversified specifications and material selection of NF series bearings enable it to meet the needs of different working conditions and environments and provide reliable performance guarantee.

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CYLINDRICAL ROLLER BEARINGS

NF300 Series

NF300 Cylindrical Roller Bearings

Two ribs on outer ring · one rib on inner ring · separable design

50-300mm

Bore range

180-650kN

Dynamic load rating

+0.05mm

Misalignment tolerance

Product overview

NF300 series cylindrical roller bearings feature a double-ribbed outer ring and a single-ribbed inner ring, allowing limited axial displacement in one direction while supporting high radial loads. The line contact between rollers and raceways provides high stiffness under heavy radial forces. Rollers are guided by machined brass or pressed steel cages to reduce friction at high rotational speeds. The separable design enables independent mounting of inner and outer rings, facilitating assembly in applications with interference-fit shafts. Heat stabilization is applied for operating temperatures up to 150°C. Logarithmic roller crowning reduces edge stresses at the roller-raceway contact interface. Standard internal clearance groups include CN, C3, and C4 for thermal expansion compensation.

Dimension range (ISO 15)

Bore diameter (d)50 mm — 300 mm

Outer diameter (D)90 mm — 460 mm

Width (B)20 mm — 118 mm

Corner radius (r)1.5 mm — 4.0 mm

Basic dynamic load rating85 kN — 520 kN

Engineering characteristics

Separable ring design permits independent mounting of inner and outer rings for press-fit shafts

High radial stiffness due to full roller complement or cage-guided roller set

Axial displacement capacity up to 2.5 mm for accommodating thermal expansion

ISO class P0 or P6 dimensional accuracy with P5 available on request

Technical specifications by size

Designation	d (mm)	D (mm)	B (mm)	C (kN)	C0 (kN)
NF304	20	52	15	30.5	27.0
NF306	30	72	19	49.5	44.0
NF308	40	90	23	75.0	68.0
NF310	50	110	27	102.0	92.0
NF312	60	130	31	128.0	118.0
NF315	75	160	37	185.0	172.0
NF318	90	190	43	245.0	228.0
NF322	110	240	50	335.0	315.0

Application fields

Electric motor rotor supports Industrial gearbox high-speed shafts Paper machine roll necks Centrifugal compressors Railway traction motor bearings Machine tool spindles Metal rolling mill backup rolls

Installation & maintenance

How to mount NF300 series with interference fit on shaft?
Heat inner ring using induction heater to 80-100°C above ambient. Do not exceed 120°C. Mount immediately and allow cooling before installing rollers and cage.

Lubrication method for speeds above 4000 rpm
Oil jet lubrication recommended for dN values exceeding 400,000 mm·rpm. Use ISO VG 68 oil with anti-wear additives. For grease lubrication, reduce relubrication interval to 500 hours.

Axial displacement allowance in NF design
The NF series permits axial movement of the shaft relative to housing up to 2.0 mm in one direction. For applications requiring bidirectional displacement, specify NUP or NU design.

▸ Critical notes

Minimum radial load P ≥ 0.02 C required to prevent roller skidding at high speed
Do not apply pure axial load — NF series supports axial displacement only under radial load
When mounting with adapter sleeve, verify reduction of radial clearance by 0.02-0.04 mm
Replace cage if audible metallic noise occurs during no-load rotation

Equivalent to SKF NF300 series · FAG NF300 · NSK NF · Timken NF

Interchange standard ISO 15:2017 · DIN 5412-1

Designation	Principal Dimensions(mm)					Basic Load Ratings(KN)		Limited Speed(rpm)		Weight
Designation	d	D	B	rs min	rs1min	Dynamic(Cr)	Static(Cor)	Grease	Oil	(kg)
NF303E	17	47	14	1	0.6	24.65	21.16	13000	15000	0.139
NF304E	20	52	15	1.1	0.6	23.1	19.2	14000	17000	0.149
NF305E	25	62	17	1.1	1.1	38.5	35.8	9000	12000	0.24
NF306E	30	72	19	1.1	1.1	49.2	48.2	8000	10000	0.38
NF307E	35	80	21	1.5	1.1	62	63.2	7000	9000	0.54
NF308E	40	90	23	1.5	1.5	76.8	77.8	6300	8000	0.65
NF309E	45	100	25	1.5	1.5	93	98	5600	7000	0.95
NF310E	50	110	27	2	2	105	112	5300	6700	1.2
NF311E	55	120	29	2	2	128	138	4800	6000	1.61
NF312E	60	130	31	2.1	2.1	142	155	4500	5600	1.94
NF313E	65	140	33	2.1	2.1	170	188	4000	5000	2.42
NF314E	70	150	35	2.1	2.1	195	220	3800	4800	2.9
NF315E	75	160	37	2.1	2.1	228	260	3600	4500	3.59
NF316E	80	170	39	2.1	2.1	245	270	3400	4300	3.9
NF317E	85	180	41	3	3	265	280	3200	4000	5.2
NF318E	90	190	43	3	3	290	320	3000	3800	6.17
NF319E	95	200	45	3	3	320	350	2800	3600	6.92
NF320E	100	215	47	3	3	355	380	2600	3200	8.24
NF321E	105	225	49	3	3	390	420	2200	3000	9.9
NF322E	110	240	50	3	3	415	470	2000	2800	11.2
NF324E	120	260	55	3	3	440	552	1900	2600	14.1

NF300 Series

Product overview

Engineering characteristics

Technical specifications by size

Installation & maintenance

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