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Double Row Angular Contact Bearing With U-shaped Holder

Double Row Angular Contact Bearing With U-shaped Holder The overall manufacturing accuracy of the bearings reaches P4 level (GB/T 307.1), with the radial runout strictly controlled below 3μm, guaranteeing high-precision operation of the equipment, especially suitable for precision instruments and automated equipment with stringent accuracy requirements.

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	Type	Main dimensions			Rated load		Rated speed
					Dynamics	Static	Speed limit
Mail		d[mm]	D[mm]	B[mm]	C[kN]	C₀[kN]	[r/min]
	3214 ZU	70	125	39	91.2	99.8	-
	3213 ZU	65	120	38	91.9	98.8	-
	3212 ZU	60	110	36	85.9	86.5	-
	3211 ZU	55	100	33	69.2	68.7	-
	3210 ZU	50	90	30	54.2	52.9	-
	3209 ZU	45	85	30	54.7	52.2	-
	3208 ZU	40	80	30	50.4	44.8	-
	3207 ZU	35	72	27	38.1	33.1	-
	3206 ZU	30	62	23	32.7	27.4	-
	3205 ZU	25	32	20	22.7	18.5	-
	3204 ZU	20	47	20	20.6	15.1	-
	3203 ZU	17	40	17	12.8	7.9	-

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Unique Design Highlights

Innovative U-shaped Holder
- Featuring a distinct U-shaped cross-section design, compared to traditional retainers, it enables smoother ball guidance, effectively reducing the frictional resistance between the balls and the holder by approximately 30%, with a friction coefficient as low as 0.06 - 0.1.
- Made of high-performance engineering plastics, it exhibits excellent self-lubricating properties, extending the operating temperature range to -50°C to +180°C, capable of adapting to various complex working conditions. Meanwhile, its weight is about 40% lighter than that of metal retainers, facilitating high-speed operation.
Optimized Dual Row Angular Contact Structure
- With an axial load capacity of up to 20kN, enabling stable operation even under significant axial forces, meeting the requirements of equipment such as machine tool spindles.
- Employing back-to-back (DB) or face-to-face (DF) pairing installation methods, it enhances system rigidity, effectively resists overturning moments, and improves the reliability of the equipment under heavy loads and high-speed operation.

Application

The bearings can be used in the following industries

Machine Tool Industry: As a crucial supporting component for the spindles of various machine tools (such as machining centers, lathes, milling machines), it ensures machining accuracy and efficient cutting, facilitating the manufacturing of precision parts.
Industrial Automation: Widely used in the joints of robotic arms and high-speed transmission devices in automated production lines, it ensures precise motion execution and stable power transmission, enhancing production efficiency.
Aerospace: Meeting the stringent requirements of aircraft engines, navigation equipment, etc. for the high precision, high reliability, and extreme environment resistance of bearings, ensuring flight safety and the normal operation of equipment.
High-End Medical Equipment: For example, the rotating parts of CT scanners and magnetic resonance imaging equipment.