UC Insert Bearing
Spherical Outer Ring Insert Bearing with Set Screw Locking for Mounted Bearing Units
For machinery designers and maintenance buyers, insert bearing selection is often influenced by shaft locking method, housing compatibility, and installation conditions as much as by load capacity.
When equipment requires a ready-to-mount bearing insert with self-aligning capability and simple shaft locking, UC insert bearings provide a practical solution for mounted bearing units in industrial machinery.
The UC insert bearing is a radial insert ball bearing with a spherical outer ring and an inner ring extended on both sides. It is locked onto the shaft by tightening two set screws on the inner ring, making it easy to mount. The spherical outer ring allows the bearing to self-align within the housing. Available in UC204 through UC212 and other sizes, these inserts are widely used in UCP, UCF, UCFL, and UCT mounted bearing units.
For industrial distributors, OEM manufacturers, and maintenance suppliers, UC insert bearings offer a standardized bearing unit that simplifies installation and replacement processes while providing reliable shaft support.
Understanding the UC Insert Bearing Structure
Unlike standard deep groove ball bearings that are mounted directly into a housing bore, UC insert bearings feature a spherical outer ring that fits into a matching spherical seat in the housing, allowing self-alignment.
The inner ring is extended on both sides to provide a wider contact area with the shaft and accommodate the set screws used for locking.[reference:0]
| Component | Function |
|---|---|
| Spherical Outer Ring | Allows self-alignment within the housing seat to compensate for initial misalignment |
| Extended Inner Ring | Provides wider shaft contact area; inner ring extended on both sides |
| Set Screws (2) | Lock the inner ring onto the shaft; positioned 120° apart on the inner ring |
| Contact Seals and Flingers | Protect internal components from contamination on both sides |
| Grease Fitting (Optional) | Enables lubrication maintenance for relubricatable configurations |
This structure makes UC insert bearings suitable for equipment where self-alignment, simple shaft mounting, and reliable shaft support are important considerations.
UC Insert Bearing Product Specifications
| Item | Specification |
|---|---|
| Product Name | UC Insert Bearing |
| Bearing Type | Radial Insert Ball Bearing |
| Available Models | UC204, UC205, UC206, UC207, UC208, UC209, UC210, UC211, UC212 |
| Shaft Diameter Range | 20 mm – 60 mm |
| Bore Type | Cylindrical |
| Rolling Elements | Balls |
| Outer Ring Type | Spherical |
| Inner Ring Extension | On both sides |
| Locking Method | Set Screw (2 screws, positioned 120° apart) |
| Bearing Material | Chrome Steel (GCr15 / AISI 52100) |
| Cage | Sheet Metal |
| Sealing | Seal and Flinger on Both Sides |
| Lubrication | Grease Lubricated (Permanently Lubricated) |
| Relubrication | With (grease fitting) |
| Operating Temperature | -20°C to +100°C |
UC Insert Bearing Dimensions
Incorrect dimension matching is one of the most common causes of bearing replacement problems. Buyers should verify the following dimensions before ordering.
| Model | Bore (d) | Outside Diameter (D) | Inner Ring Width (B) | Outer Ring Width (C) | Set Screw | Weight |
|---|---|---|---|---|---|---|
| UC204 | 20 mm | 47 mm | 31 mm | 17 mm | M6x0.75 | 0.16 kg |
| UC205 | 25 mm | 52 mm | 34 mm | 17 mm | M6x0.75 | 0.20 kg |
| UC206 | 30 mm | 62 mm | 38.1 mm | 19 mm | M6x0.75 | 0.32 kg |
| UC207 | 35 mm | 72 mm | 42.9 mm | 20 mm | M8x1 | 0.48 kg |
| UC208 | 40 mm | 80 mm | 49.2 mm | 21 mm | M8x1 | 0.64 kg |
| UC209 | 45 mm | 85 mm | 49.2 mm | 22 mm | M8x1 | 0.68 kg |
| UC210 | 50 mm | 90 mm | 51.6 mm | 24 mm | M10x1.25 | 0.80 kg |
| UC211 | 55 mm | 100 mm | 55.6 mm | 25 mm | M10x1.25 | 1.11 kg |
| UC212 | 60 mm | 110 mm | 65.1 mm | 27 mm | M10x1.25 | 1.54 kg |
Data sourced from standard insert bearing dimension tables.[reference:1]
Why Buyers Choose UC Insert Bearings Instead of Other Insert Bearings
The choice between different insert bearing designs usually depends on shaft locking method and operating conditions.
| Installation Requirement | Recommended Structure |
|---|---|
| Standard industrial applications | UC insert bearing with set screw locking |
| Higher axial holding power required | Eccentric locking collar insert bearing |
| Adapter sleeve mounting required | UK insert bearing with tapered bore |
| Applications with vibration | UC insert bearing with set screw locking (nylon patch available) |
UC insert bearings are especially suitable when a simple, direct shaft locking method is preferred for cylindrical shafts.[reference:2]
Installation Advantages for Machine Builders
For OEM equipment manufacturers, installation efficiency and design flexibility can influence overall production time.
UC insert bearings provide several practical design benefits:
| Design Consideration | UC Insert Bearing Advantage |
|---|---|
| Simple shaft mounting | Two set screws secure the inner ring to the shaft; no additional locking collar required |
| Self-alignment capability | Spherical outer ring compensates for initial misalignment within the housing |
| Quick installation | Ready-to-mount design simplifies assembly and replacement |
| Reduced noise and vibration | Design features help reduce noise and vibration levels during operation |
| Housing compatibility | Fits standard UCP, UCF, UCFL, and UCT housings |
| Maintenance access | Relubrication via grease fitting extends service life |
The spherical outer ring allows engineers to integrate the insert bearing into various housing designs without requiring precise alignment during installation.
Key Dimensions Buyers Should Confirm Before Ordering
Incorrect dimension matching is one of the most common causes of bearing replacement problems.
Before purchase, buyers should verify:
| Confirmation Item | Reason |
|---|---|
| Shaft Diameter (d) | Match bearing bore size |
| Outside Diameter (D) | Ensure housing compatibility |
| Inner Ring Width (B) | Confirm shaft engagement length |
| Outer Ring Width (C) | Confirm housing seat width |
| Set Screw Size | Match hex key and tightening torque |
| Load Rating (Cr / C0r) | Match operating load conditions |
| Limiting Speed | Check application speed suitability |
| Sealing Type | Match operating environment |
For replacement projects, comparing the existing insert bearing with the complete assembly is recommended.
UC Insert Bearings Compared With Similar Insert Bearing Types
Different insert bearing designs serve different equipment requirements.
| Model/Series | Design Feature | Typical Use |
|---|---|---|
| UC Series | Set screw locking, spherical outer ring, extended inner ring | General industrial applications with cylindrical shafts |
| UK Series | Tapered bore with adapter sleeve locking | Applications requiring higher axial holding power |
| HC Series | Eccentric locking collar | Applications with vibration or alternating rotation |
| SA Series | Set screw locking with different dimensional series | Specific housing configurations |
| SB Series | Set screw locking with different dimensional series | Specific housing configurations |
The correct choice depends mainly on shaft locking requirements, load conditions, and housing configuration.
Applications Where UC Insert Bearings Are Commonly Selected
UC insert bearings are used in many industrial machines requiring reliable shaft support.
| Equipment Type | Application |
|---|---|
| Conveyor Equipment | Roller shaft support in material handling conveyors |
| Agricultural Equipment | Transmission components and shaft support |
| Packaging Machinery | Compact rotating assemblies |
| Food Processing Machinery | General shaft support in processing equipment |
| Material Handling Systems | Side-mounted shafts and conveyor components |
| HVAC Equipment | Fan and blower shaft support |
| Textile Machinery | Shaft support in processing equipment |
| Construction Machinery | Heavy-duty shaft support applications |
Applications include material handling conveyors, packaging equipment, HVAC equipment, agricultural machinery, food process machinery, parcel and baggage handling conveyors, construction machinery, textile machinery, fitness equipment, and escalators.[reference:3]
Mounting & Installation Guide
Proper mounting and installation are essential for reliable UC insert bearing performance.
| Installation Step | Description |
|---|---|
| Shaft Preparation | Clean shaft and check dimensional tolerances. Recommended shaft tolerance is h6 for limiting speed.[reference:4] |
| Insert Placement | Slide the insert bearing onto the shaft to its intended axial position. |
| Set Screw Tightening | Fasten the two hexagon socket set screws to the shaft with a hexagon socket wrench. Tighten the tip of each set screw until it slightly indents the shaft surface as required. Check that the set screw tips do not protrude into the bearing bore.[reference:5] |
| Recommended Tightening Torque | For UC309 with M10x1.25 set screw: 16.5 N·m.[reference:6] Refer to specific model requirements. |
| Housing Installation | The spherical outer ring fits into the housing seat, allowing self-alignment. |
| Lubrication | Insert bearings are supplied pre-lubricated with grease. Relubrication can be performed through the grease fitting.[reference:7] |
Customization & OEM Services
For buyers requiring specific insert bearing configurations, customization options are available.
| Customization Area | Available Options |
|---|---|
| Model Series | UC204 through UC212 and other sizes according to application requirements |
| Shaft Diameter | Custom bore sizes from 20 mm to 60 mm |
| Locking Method | Set screw locking (standard) or other locking configurations |
| Sealing Options | Standard seal and flinger or enhanced sealing configurations |
| Material Options | Chrome steel GCr15 (standard) or stainless steel for corrosion resistance |
| OEM Packaging | Customized packaging and labeling available for qualified orders |
Manufacturing Process & Quality Control
UC insert bearings are manufactured through a controlled process to ensure consistent quality and performance.
| Process Stage | Description |
|---|---|
| Material Preparation | Chrome steel GCr15 material prepared according to specified bearing configuration |
| Ring Processing | Inner and outer rings processed to form required geometry and raceways |
| Heat Treatment | Controlled heat treatment for hardness and dimensional stability |
| Precision Grinding | Raceways and critical surfaces precision ground for smooth operation |
| Assembly | Balls, cage, seals, and set screws assembled according to specification |
| Quality Inspection | Dimensional, rotational, and sealing performance verified |
Quality Control: Dimensional inspection verifies bore diameter, outside diameter, inner ring width, and outer ring width against approved specifications. Bearing rotational condition is checked for smooth operation and abnormal resistance. Seal and flinger installation is verified to ensure proper contamination protection. Final inspection covers appearance, lubrication condition, model identification, and packaging condition before shipment.
Quality documentation includes ISO 9001 certification and applicable product compliance documentation according to order requirements.
FAQ
What is a UC insert bearing?
A UC insert bearing is a radial insert ball bearing with a spherical outer ring and an inner ring extended on both sides. It is locked onto the shaft by tightening two set screws on the inner ring, making it easy to mount.[reference:8]
What sizes are available?
UC insert bearings are available in UC204 (20 mm shaft) through UC212 (60 mm shaft) and other sizes including UC201, UC202, UC213, and UC214. Custom bore sizes can also be specified.
What is the difference between UC and UK insert bearings?
UC insert bearings use set screw locking on a cylindrical bore and are designed for direct mounting onto a cylindrical shaft. UK insert bearings feature a tapered bore and are mounted using an adapter sleeve, which provides higher axial holding power.
What material is the bearing made of?
UC insert bearings are made of chrome steel GCr15 (AISI 52100 equivalent). Stainless steel options are available for applications requiring corrosion resistance.[reference:9]
How are UC insert bearings locked onto the shaft?
UC insert bearings use two set screws positioned 120° apart on the inner ring. The screws are tightened with a hexagon socket wrench until the tips slightly indent the shaft surface.[reference:10]
Can UC insert bearings handle misalignment?
Yes. The spherical outer ring allows the bearing to self-align within the housing seat, compensating for initial misalignment between the shaft and housing.
What is the recommended shaft tolerance?
The recommended shaft tolerance is h6 for achieving the specified limiting speed.[reference:11]
Can UC insert bearings be relubricated?
Yes. UC insert bearings are supplied pre-lubricated with grease and include a grease fitting for relubrication. In normal applications, re-lubrication may not be necessary.[reference:12]
What applications use UC insert bearings?
UC insert bearings are used in conveyors, agricultural machinery, packaging equipment, HVAC equipment, food processing machinery, textile machinery, construction machinery, and general industrial applications.[reference:13]
Can OEM packaging be provided?
Yes. Customized packaging and labeling options are available for qualified orders.
What information is needed for quotation?
Buyers should provide model number, quantity, shaft diameter, application details, sealing requirements, and any special specifications.
UC Insert Bearings for Reliable Mounted Bearing Unit Solutions
When machine design requires a ready-to-mount bearing insert with self-aligning capability and simple shaft locking, UC insert bearings provide a practical solution for mounted bearing units in industrial machinery.
UC insert bearings combine spherical outer ring construction with set screw locking, making them suitable for conveyor equipment, agricultural machinery, packaging equipment, HVAC systems, and OEM applications.
For global distributors and machinery manufacturers, reliable quality, consistent supply, and flexible purchasing options are key factors in long-term cooperation.
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