Product photo — see the table below for main specifications; non-standard designs welcome

Double Row Cylindrical Roller Bearings

Double row (NN/NNU) cylindrical roller bearings combine high rigidity with a small radial section and precision up to class P4/P2 — the first choice for machine-tool spindles and high-speed precision equipment. The ribbed inner ring allows precise preload adjustment of radial clearance.

Category	Cylindrical Roller Bearings
Precision class	P0 / P6 / P5 (P4 for precision types)
Clearance group	C0 / C2 / C3 / C4 (by application)
Material	GCr15 high-carbon chromium steel / carburising steel (optional)
Heat treatment	Quenched & tempered, 58–64 HRC, dimensional stabilised
Standards	GB/T 307 / ISO 492 / JB-T (per product)

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Series note: Line contact between rollers and raceways gives far higher radial capacity and rigidity than same-size ball bearings, with separable rings for easy mounting. The range covers single row (NU/…

Main Specifications

Sample of common models (18 models in total — contact us for the full catalogue)

基本尺寸（mm）					基本额定载荷（KN）		Max.转速（r/min）		其它尺寸（mm）				接触面与倒角装配尺寸（mm）
d	D	B	r	Ew.Fw	Cr	Cor	Grease	Oil	d1	D1	b	k	da(min)	Da(max)	ra(max)
50	80	23	1	72.5	60	85	10000	13000	61.3	-	-	-	55	75	1
50	80	23	1	72.5	60	84.5	10000	13000	61.3	-	-	-	55	75	1
50	130	63	1.5	50	270	320	10000	12000	-	80	-	-	55	122	1
60	95	26	1.1	86.1	77	114	9000	10000	73.3	-	-	-	66	89	1
60	150	73	3	60	275	410	9000	10000	-	97	-	-	66	132	1
65	160	73	3	65	308	460	8500	9500	-	99.5	-	-	73	143	1
75	115	30	1.1	105	106	165	6700	8000	90.6	-	-	-	81.5	108.5	1
75	115	30	1.1	105	106	165	6700	8000	90.6	-	-	-	81.5	108.5	1
80	125	34	1.1	113	130	207	4500	5600	97	-	-	-	86.5	118.5	1
80	125	34	1.1	113	130	207	4500	5600	97	-	-	-	86.5	118.5	1

Double Row Cylindrical Roller Bearings

Double Row Cylindrical Roller Bearings

Main Specifications

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