UCF BEARING -PILLOW BLOCK BEARING

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Core Design of UCF Bearings：

The outer surface of the outer ring is spherical, which matches the spherical inner hole of the bearing seat. This structure gives the bearing a certain self-aligning ability (usually allowing a maximum axis deviation of 2.5°), which can effectively compensate for deviations caused by shaft bending or poor installation alignment. The bearing is pre-filled with grease and equipped with a double seal structure when it leaves the factory. It has the characteristics of long-term stable operation in harsh environments such as dust and moisture, which greatly simplifies the on-site installation and maintenance process.

Common materials and characteristics of UCF bearings

The material selection of UCF bearings directly affects their performance and applicable scenarios. They mainly include three types of materials: bearing body, seat body and sealing components.

What is Bearing body material?

The mainstream uses high carbon chromium bearing steel GCr15 (fully hardened type), which provides excellent wear resistance and fatigue strength; in corrosive environments, stainless bearing steel AISI440 (9Cr18) is used to take into account both rust prevention and mechanical properties. Special applications such as food machinery even use nickel-plated brass or chrome steel to meet hygiene and chemical corrosion resistance requirements.

What's seat material?

Square seat (F type) is mainly made of cast iron (such as gray cast iron), which has high rigidity and vibration reduction characteristics and is suitable for heavy-duty industrial environments; for lightweight or corrosion-resistant scenarios, reinforced polypropylene (PP+glass fiber) is used, and the surface is covered with AISI 304 stainless steel. This type of design is common in food processing and pharmaceutical equipment.

What's the auxiliary components material?

The sealing ring is usually made of NBR nitrile rubber, which balances wear resistance and elasticity; the cage is made of F1 carbon steel stampings; the eccentric sleeve and top screw are made of surface-hardened chrome steel.

Analysis of the structural design of UCF bearings

The UCF bearing unit is a precision combination of an outer spherical bearing and a square seat. Its structural design includes the following key features:

Tightening mechanism

UC bearings have set screws on the inner ring flange, which can be directly locked on the optical axis without the need for shoulder positioning. This structure is more convenient for axial position adjustment than UK type (tapered hole) and UEL type (eccentric sleeve). When tightening the screws, please note: the axial load must not exceed 20% of the rated dynamic load to avoid loosening due to overload.

Sealing system

It uses double-sided contact seals (usually steel frame + rubber lip seals) and is filled with long-lasting lithium-based grease. The sealing structure can effectively prevent dust and water vapor from invading and achieve lifelong lubrication (under moderate working conditions).

Seat installation design

The bottom of the square seat is machined with four mounting holes, which are fixed to the equipment base by bolts. The hole spacing is standardized (such as 70×70mm for UCF205) to ensure interchangeability. The boss design (such as UCFS type) is convenient for installation in narrow spaces.

Core characteristics and technical advantages of UCF bearings

UCF bearings exhibit several outstanding characteristics in industrial applications:

1. Self-alignment and anti-eccentric load capability

The combination of the spherical outer diameter and the ball socket provides a ±1°-2.5° centering range to compensate for shaft bending or centering errors, especially suitable for long shaft systems (such as conveyors)

2.High protection and low maintenance

The double seal design (often with dust cover) makes the protection level reach IP55 or above. The factory pre-lubricated design eliminates the cleaning and initial oiling process, reducing maintenance costs.

3. Load-bearing and durability

Taking UCF212-J7 as an example, its basic rated dynamic load is up to 52,000N, fatigue load limit is 1,530N, and operating temperature range is -20℃~120℃, which is suitable for heavy load and temperature fluctuation environment. The gray cast iron body further improves the system stiffness and damping characteristics

4. Ease of installation

The integrated structure eliminates the need for centering adjustment between the bearing and the seat, and the square seat can be directly fixed with bolts, shortening the equipment assembly time by more than 40%. The installation of a typical model such as UCF211 only requires tightening the top screw and base bolts.

Main application areas of UCF bearings

Due to its robustness and environmental adaptability, UCF bearings are widely used in the following fields:

Heavy Industry and Conveying Systems

Bear heavy loads in mining machinery and steel mill conveyor rollers. Typical models such as UCF212-J7 cast iron seat bearings are used in production line conveyor systems

Environmental protection and public facilities

UCF213 bearings are specially used for aerators and pump shafts in sewage treatment equipment. Their corrosion resistance and sealing properties can withstand sewage environments.

Building materials and glass manufacturing

The rollers and conveyors of the insulating glass production line use large-size bearings (inner diameter 75mm) such as UCF215, which can withstand high temperatures and dust.

Agricultural and construction machinery

The UCF200 series is widely used in the transmission system of tractors and harvesters. Its dust-proof design is suitable for dusty field environments.

Food and pharmaceutical industry

The UCF/CXA series with PP body and stainless steel cover meets FDA hygiene standards and is used in filling lines, sorting machines, etc. It can withstand the erosion of antibacterial detergents.

uCF bearing dimension

UCF Series productcate-330-355 productcate-200-353

Unit No.	Dimensions (mm, inch)										Weight (kg)
Unit No.	d	L	J	AZ	A1	A	A0	N	S	B	Weight (kg)
UCF201	12mm	85	64	15	12	25.5	33.3	12	12.7	31	0.60
UCF202	15mm	85	64	15	12	25.5	33.3	12	12.7	31	0.60
UCF203	17mm	85	64	15	12	25,5	33.3	12	12.7	31	0.60
UCF204	20mm	85	64	15	12	25.5	33.3	12	12.7	31	0.60
UCF204-12	3/4 in	85	64	15	12	25.5	33.3	12	12.7	31	0.60
UCF205	25mm	95	70	16	14	27	35.8	12	14.3	34.1	0.80
UCF205-16	3/4 in	95	70	16	14	27	3S.8	12	14.3	34.1	0.80
UCF206	30mm	108	83	18	14	31	40.2	12	15.9	38.1	1.05
UCF206-18	1-1/8 in	108	83	18	14	31	40.2	12	15.9	38.1	1.05
UCF207	35mm	117	92	19	16	34	44.4	14	17.5	42.9	1.45
UCF207-20	1-1/4 in	117	92	19	16	34	44.4	14	17.5	42.9	1.45
UCF208	40mm	130	102	21	16	36	51.2	16	19	49.2	1.84
UCF208-24	1-1/2 in	130	102	21	16	36	51.2	16	19	49.2	1.84
UCF209	45mm	137	105	22	18	38	52.2	16	19	49.2	2.15
UCF209-28	1-3/4 in	137	105	22	18	38	52.2	16	19	49.2	2.15
UCF210	50mm	143	111	22	18	40	54.6	16	19	51.6	2.45
UCF210-30	1-7/8 in	143	111	22	18	40	54.6	16	19	S1.6	2.45
UCF211	55mm	162	130	25	20	43	58.4	19	22.2	55.6	3.10
UCF211-32	2 in	162	130	25	20	43	58.4	19	22.2	55.6	3.10
UCF212	60mm	175	143	29	20	48	68.7	19	25.4	65.1	4.15
UCF212-36	2-1/4 in	175	143	29	20	48	68.7	19	25.4	65.1	4.15
UCF213	65mm	187	149	30	22	50	69.7	19	25.4	65.1	5.00
UCF213-40	2-1/2 in	187	149	30	22	50	69.7	19	25.4	65.1	5.00
UCF214	70mm	193	152	31	22	54	75.4	19	30.2	74.6	5.60
UCF214-44	2-3/4 in	193	152	31	22	54	75.4	19	30,2	74.6	5.60
UCF215	75mm	200	159	34	22	56	78.5	19	33.3	77.8	6.90
UCF215-48	3 in	200	159	34	22	56	78.5	19	33.3	77.8	6.90
UCF216	80mm	208	165	34	22	58	83.3	23	33.3	82.6	7.50
UCF217	85mm	220	175	36	24	63	87.6	23	34.1	85.7	9.60
UCF216	90mm	235	137	40	24	68	96.3	23	39.7	96	12.10

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