RA Type (Outer Ring Segmented, Inner Ring For Rotation)

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RA Type (Outer Ring Segmented, Inner Ring For Rotation)

This series represents a compact Slewing Ring Bearing (SRB) where the thickness of both the inner and outer rings has been reduced to the absolute limit. It is suitable for applications that require a lightweight, compact design, such as the rotating sections of industrial production robots and mechanical manipulators in fields like China's manufacturing industry.

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Common Problems and Causes
·Inadequate Lubrication: The use of an unsuitable lubricant, improper lubricant quantity, or an unreasonable lubrication interval are the main causes of bearing failure.
·Fatigue: Approximately one-third of bearing failures are caused by material fatigue.
·Contaminants: Seal failure can allow contaminants to enter the bearing, leading to damage.
·Installation Errors: Errors or improper operations during the installation process can lead to premature bearing failure.
·Excessive Load: If the bearing is subjected to a load exceeding its designed load capacity, its damage will be accelerated.
·Other Causes: Including improper transportation, incorrect fit (mating), etc.

Symptoms of Failure
·The bearing emits a "squeaking" or "grinding" metallic friction sound during operation.
·In severe cases, this will be accompanied by vibration in the steering wheel or mechanical components.
·In vehicles, a damaged wheel bearing will produce a humming or buzzing abnormal noise.

Solutions
·Ensure Correct Lubrication: Use a suitable lubricant and follow the manufacturer's recommended lubrication procedure and intervals.
·Inspection and Cleaning: Regularly inspect the bearing and ensure the seals are intact to prevent the ingress of contaminants.
·Proper Installation: Follow the instruction manual for installation, avoiding operating errors and improper fits.
·Select Appropriate Bearings: Ensure the selected bearing's load capacity meets your application requirements to avoid overloading.
·Timely Replacement: If the bearing is damaged, it should be replaced immediately. For example, if a wheel bearing is damaged, it must be replaced promptly to ensure driving safety.

Bearing Type Dimension Shoulder Size   Basic Load rating(radial) Weight
Inner Diameter Outside Diameter Roller Pitch Diameter Height Chamfer Cr Cor
d D Dpw B B1 Rmin ds Dh KN KN kg
RA5008 50  66  57  0.5  53.5  60.5  5.1  7.19  0.08 
RA6008 60  76  67  0.5  63.5  70.5  5.68  8.68  0.09 
RA7008 70  86  77  0.5  73.5  80.5  5.98  9.8  0.1 
RA8008 80  96  87  0.5  83.5  90.5  6.37  11.3  0.11 
RA9008 90  106  97  0.5  93.5  100.5  6.76  12.4  0.12 
RA10008 100  116  107  0.5  103.5  110.5  7.15  13.9  0.14 
RA11008 110  126  117  0.5  113.5  120.5  7.45  15  0.15 
RA12008 120  136  127  0.5  123.5  130.5  7.84  16.5  0.17 
RA13008 130  146  137  0.5  133.5  140.5  7.94  17.6  0.18 
RA14008 140  156  147  0.5  143.5  150.5  8.33  19.1  0.19 
RA15008 150  166  157  0.5  153.5  160.5  8.82  20.6  0.2 
RA16013 160  186  172  13  0.8  165  179  23.3  44.9  0.59 
RA17013 170  196  182  13  0.8  175  189  23.5  46.5  0.64 
RA18013 180  206  192  13  0.8  185  199  24.5  49.8  0.68 
RA19013 190  216  202  13  0.8  195  209  24.9  51.5  0.69 
RA20013 200  226  212  13  0.8  205  219  25.8  54.7  0.71 
Engineering the Future of Motion
About UKL
Founded in 2020, UKL Bearing Manufacturing Co., Ltd. (Wuxi) is China RA Type (Outer Ring Segmented, Inner Ring For Rotation) suppliers and OEM/ODM RA Type (Outer Ring Segmented, Inner Ring For Rotation) company, an integrated industrial and trading enterprise that focuses on precision manufacturing, combining R&D, production, and sales.
The company specializes in high-performance bearing solutions, providing technical support for global industries with exceptionally high demands for precision and reliability.

With more than 200 skilled professionals and a fully modernized production base, UKL’s facilities cover the entire manufacturing process — forging, annealing, turning, heat treatment, grinding, and automated assembly.
Leveraging over 15 years of OEM/ODM export experience, UKL responds quickly to customer needs, offering flexible and customized services for clients across Europe, Asia, Africa, and the Middle East.

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Ukl Bearing Manufacturing Co.,Ltd
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