/ Single row cylindrical roller bearings

rnu bearing

1.Product Introduction: Inner ring-free design, inner hole directly matched with the shaft, suitable for scenarios requiring large shaft diameters and simplified structures.
2.Structure Type: Outer ring with double ribs + inner raceway, no inner ring, single-row rollers + cage, open type.
3.Dimension Range: Inner diameter: 50-500mm (matching shaft diameter), Outer diameter: 100-800mm, Width: 20-100mm.
4.Material: Outer ring/Rollers: GCr15/GCr15SiMn/20Cr2Ni4A; Cage: Stamped steel/brass
5.Accuracy: Class P0/P6; Shaft surface accuracy must match (Ra≤0.8μm)
6.Application Fields: Large motor rotors, mining machinery spindles, auxiliary rolls of rolling mills
7.Key Inspection Items: Outer ring raceway accuracy, radial clearance, compliance of shaft mating surface accuracy.

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Product Description

Data Sheet

RNU Bearings: Engineered for Extreme Load, Heat & Precision in Heavy Industries

When your machinery demands unmatched durability and precision, RNU bearings deliver. Designed for heavy industries, these inner ring-free bearings simplify large shaft applications while handling radial loads up to 500kN. With 30+ years of expertise, LUOYANG INNO BEARING CO., LTD combines vertical integration and agile manufacturing to provide custom solutions up to φ5000mm—prototype to bulk orders in 15 days.

product-750-750

Why Choose Us?

No Inner Ring Design: Direct shaft mating reduces complexity, ideal for mining spindles, rolling mills, and large motor rotors.
Built to Last: GCr15 steel construction, precision grinding, and P0/P6 accuracy ensure 100,000+ hours under heavy loads.
Rapid Customization: Modify dimensions (50–500mm shaft fit), materials, or seals in 20-30 days—30% faster than competitors.
Always in Stock: 1,000+ standard products (φ50–800mm) ship in 48 hours.

Technical Excellence for Demanding Applications

Parameter	Specification
Shaft Fit	50–500mm (Ra ≤0.8μm surface finish)
Materials	Outer Ring/Rollers: GCr15/20Cr2Ni4A; Cage: Brass/Steel
Precision	P0/P6 (shaft accuracy critical)
Max Speed	12,000 RPM (customizable for high-speed needs)

Trusted Across Industries

Metallurgy: RNU-HT series handles 150℃ in rolling mills with graphite lubrication.
Port Machinery: Triple-sealed RNU-HD bearings withstand 1,000kN dynamic loads on cranes.
Medical: Noise-free (<18dB) RNU-PM bearings for MRI/PET-CT machines.

Rigorous Quality Assurance

Every RNU bearing undergoes:

1. Material Testing: Spectrometer checks for steel purity.

2. In-Process Checks: Laser scanners verify raceway tolerances (±0.002mm).

3. Final Validation: 100% tested for vibration, radial clearance, and lifespan (simulated 2x operational stress).

Global Supply Chain, Local Speed

3 Regional Hubs: Stock strategically placed in EU, Asia, and North America.
Emergency Service: Breakdown? Get replacements via DHL/FedEx within 2 days.

Your Partner in Performance

We don't just sell bearings—we solve problems. Our engineers offer:

Free Load Analysis: Optimize bearing selection for your equipment.
CAD Models: Download 3D files for seamless integration.
Lifetime Support: Spare parts guaranteed, even for legacy systems.

FAQ

Q: Can products handle shafts larger than 500mm?

A: Yes! Our custom RNU-CM series supports shafts up to φ5000mm. Submit specs for a quote.

Q: What certifications do your bearings have?

A: All bearings meet ISO 9001, DIN 625, and ASTM A295. Medical-grade options are ISO 13485 certified.

Q: How do I ensure proper shaft compatibility?

A: Provide shaft diameter and surface finish (Ra ≤0.8μm required). We'll validate tolerances pre-production.

Q: Do you offer corrosion-resistant products?

A: Absolutely. Ask about our 20Cr2Ni4A material with salt spray resistance (1,000+ hours).

Contact Us

Need a Reliable Bearing Solution with RNU Bearing?

Email engineers@inno-bearing.com with your requirements. Get a technical proposal within 24 hours.

📧 Contact Us Today: sales@inno-bearing.com

d 40～45mm
Overall Dimensions					Rated Load		Limiting Rotational Speed		Bearing Designation		Shaft Diameter	Other Dimensions				Mounting Dimensions					Weight
d	D	B	rmin	r1min	Dynamic Load C	Static Load C₀	Grease	Oil	Current Model	Original Model	Shaft Diameter	d1	D1	E	F	damin	Damax	Dbmin	ramax	rbmax	Weight
mm					kN		r/min				mm	mm				mm					kg
40	80	18	1.1	11	49.1	31.9	7500	9000	NU 208E	32208E	40		67.6		49.5	47	70		1	1	0.38
	80	18	1.1	1.1	48.5	47.7	7500	9000	N208M	2208H	40	54.6		70		47		73	1	1	0.44
	80	18	1.1	1.1	48.5	47.7	7500	9000	N208	2208	40	54.6		70		47		73	1	1	0.39
	80	18	1.1	1.1	48.5	47.7	7500	9000	NF208	12208	40	54.6	66	70		47	73		1	1	0.4
	80	18	1.1	1.1	48.5	47.7	7500	9000	NU 208M	32208H1	40		65.6		50	47	73		1	1	0.45
	80	18	1.1	1.1	48.5	47.7	7500	9000	NJ 208M	42208H1	40	54.2	65.6		50	47	73		1	1	0.46
	80	18	1.1	1.1	51.2	50.4	8330	10500	NU 208 ETNI	32208EA	40		67.6		49.5	47	73		1	1	0.38
	80	18	1.1	L1	51.2	50.4	8330	10500	NJ 208ETN1	42208EA	40	54.2	67.6		49.5	47	73		1	1	0.4
	80	18	1.1	1.1	512	50.4	8330	10500	NF208ETN1	12208EA	40	54.2	676	71.5		47	73		1	1	0.39
	90	23	1.5	1.5	59.8	58.4	6700	8000	N 308	2308	40	58.4		77.5		48		80	1.5	1.5	0.66
	90	23	1.5	1.5	59.8	58.4	6700	8000	NU308Q1	32308Q	40		72.1		53.5	48	82		1.5	1.5	0.76
	90	23	1.5	1.5	59.8	58.4	6700	8000	NU 308M	32308H	40		72.1		53.5	48	82		1.5	1.5	0.75
	90	23	1.5	1.5	59.8	58.4	6700	8000	NU308L	32308L	40		72.1		53.5	48	82		1.5	1.5	0.69
	90	23	1.5	1.5	59.8	58.4	6700	8000	NJ308M	42308H	40	57.6	72.1		53.5	48	82		1.5	1.5	0.76
	90	23	1.5	1.5	83.6	88.4	6700	8000	NU 308EPC/P5		40		75.5		52	49	82		1.5	1.5	0.64
	90	23	1.5	1.5	98.9	103			NJ308EV/C9YB2		40	59.5	76		53.5	48	82		1.5	1.5	0.69
	90	23	1.5	1.5	59.8	58.4	6700	8000	NJ308L	42308L2	40	57.5	72.		53.5	48	82		15	1.5	0.68
	90	23	1.5	1.5	59.8	58.4	6700	8000	NF308M		40	58.4	725	77.5		49		80	1.5	1.5	0.67
	90	23	1.5	1.5	87.7	87.4	6500	7500	NF308EF1		40	57.5	75	81.3		49		80	1.5	1.5	0.88
	90	33	1.5	1.5	111	119	6300	7500	NJ2308E		40	57.7	75.4		52	48	82		1.5	1.5	1.17
	110	27	2	2	106	102	6000	7000	N408M		40	66		92		50		93	2	2	1.44
45	85	19	1.1	1.1	60.1	62.5	6700	8000	NJ 209EM		45	59.2	72.6		54.5	53	78		1	1	0.49
	85	19	1.1	1.1	64.3	68.1	6700	8000	NJ209EF1		45	59.2	72.6		54.5	53	78		1	1	0.62
	85	23	1.1	1.1	66.1	79.5	6700	8000	NU 2209L1		45		72.4		54.5	52	78		1	1	0.57
	85	23	1.1	1.1	72.6	79.5	6700	8000	NJ 2209EF1		45	59.2	72.6		54.5	52	78		1	1	0.77
	85	23	1.1	1.1	72.6	79.5	6700	8000	NJ 2209EM1		45		72.4		54.5	52	78		1	1	0.62
	85	23	1.1	1.1	72.6	79.5	6700	8000	NU2209EM		45		72.4		54.5	52	78		1	1	0.63
	100	25	1.5	1.5	101	103.0	6300	7500	NF309EF1		45	64.7	83.6	90		53	92	92	1.5	1.5	1.24
d 45～55mm
Overall Dimensions					Rated Load		Limiting Rotational Speed		Bearing Designation		Shaft Diameter	Other Dimensions				Mounting Dimensions					Weight
d	D	B	rmin	r1min	Dynamic Load C	Static Load C₀	Grease	Oil	Current Model	Original Model	Shaft Diameter	d1	D1	E	F	damin	Damax	Dbmin	ramax	rbmax	Weight
mm					kN		r/min				mm	mm				mm					kg
45	100	25	1.5	1.5	79.5	78.5	6300	7500	N309	2309	45	64		86.5		53		89	1.5	1.5	0.88
	100	25	1.5	1.5	79.5	78.5	6300	7500	NU 309M	32309H	45		80.2	58.5		53	92		1.5	1.5	1.01
	100	25	1.5	1.5	79.5	78.5	6300	7500	NU 309L	32309L	45		80.2	58.5		53	92		1.5	1.5	0.9
	100	25	1.5	1.5	79.5	78.5	6300	7500	NJ309M	42309H	45	62.9	80.2	58.5		53	92		1.5	1.5	1.03
	100	25	1.5	1.5	79.5	78.5	6300	7500	NJ309L	42309L	45	62.9	80.2	58.5		53	92		1.5	1.5	0.922
	100	31	1.5	1.5	130	149	5600	6700	NJ2309X2V/C9		45	635	80.2	57.87		53	92		1.5	1.5	1.21
	100	36	1.5	1.5	93.3	104	5600	6700	N2309M	2609H	45	64		86.5		53		89	1.5	1.5	1.51
	120	29	2	2	117	115	5600	6700	NJ409M		45	72	94	64.5		55	110		2	2	1.85
50	90	20	1.1	1.1	52.3	56.8	6300	7500	N210	2210	50	64.6		80.4		56.5		83.5	1	1	0.51
	90	20	1.1	1.1	54.8	60.3	6300	7500	NU 210M	32210H	50		76.3	60.4		565	83.5		1	1	0.56
	90	20	1.1	1.1	54.8	60.3	6300	7500	NU 210L	32210L	50		76.3	60.4		565	83.5		1	1	0.51
	90	20	1.1	1.1	52.3	56.8	6300	7500	NU 210Q1	32210Q1	50		76.3	60.4		565	83.5		1	1	0.55
	90	20	1.1	1.1	54.8	60.3	6300	7500	NJ210M	42210H	50	64	76.3	60.4		565	83.5		1	1	0.58
	90	20	1.1	1.1	54.8	60.3	6300	7500	NJ210L	42210L	50	64	76.3	60.4		565	83.5		1	1	0.53
	90	20	1.1	1.1	59.9	63.4	6300	7500	NJ 210EM		50	64	77.6	59.5		565	83.5		1	1	0.58
	90	20	1.1	1.1	59.9	63.4	6300	7500	NU 210EM		50		77.6	59.5		565	83.5		1	1	0.56
	90	23	1.1	1.1	64.1	69.1	6300	7500	NU 2210 EM		50		77.6	59.5		565	83.5		1	1	0.63
	90	23	1.1	1.1	76.2	86.4	6300	7500	NU 2210 EM1		50		78	59.5		565	83.5		1	1	0.65
	110	27	2		90.4	90.7	5000	6000	N310	2310	50	71		95		59		98	2	2	1.15
	110	27	2		90.4	90.7	5000	6000	NU 310	32310	50		89.6	65		59	101		2	2	1.14
	110	27	2	2	90.4	90.7	5000	6000	NU 310M	32310H	50		89.6	65		59	101		2	2	1.29
	110	27	2	2	90.4	90.7	5000	6000	NJ310	42310	50	70.2	89.6	65		59	101		2	2	1.17
	110	27	2	2	90.4	90.7	5000	6000	NJ310M	42310H	50	70.2	89.6	65		59	101		2	2	1.32
	110	40	2	2	121	133	5000	6000	NU 2310M	32610H	50		88.1	65		59	101	101	2	2	2.01
	110	40	2	2	153	172	5000	6000	NJ2310EM/C9S0		50	71	91.8	65		59	101		2	2	2.02
55	100	21	1.5	1.1	87	100	6000	7000	NJ211E	42211E	55	70.9	86.3	66		61.5	91		1.5	1	0.75
55	100	21	1.5	1.1	87	100	6000	7000	NJ211EF1		55	709	86.3	66		61.5	91		1.5	1	0.8