6902ZZ Bearing

 

6902ZZ ball bearings, suitable for high-speed rotation, high temperature resistance of 200℃, can withstand high radial and axial loads. The 6902ZZ aperture is 15 mm. Its outer diameter is 28 mm. 6902ZZ bearing material is 52100 chrome steel, there are open without sealing ring, with iron sealing ring, butadiene rubber sealing ring three styles.

 

Metric deep groove ball bearing
Model	6902zz
Inside diameter (mm)	15
Outside diameter (mm)	28
The width (mm)	OPEN		7
	ZZ		7
The material	Inner ring	Gcr15	Testing standard	GB-T 305-1998
	Outer ring	Gcr15		GB-T 305-1998
	Steel ball	Gcr15		GB-T 305-1998
	Dust cover (ZZ)	SPCC/SUS		GB-T 305-1998
	Retainer (R)	SUS/MN		-
	Oil and grease	LY series		JB-T 8571-1997
	Resistance to high temperature (℃)	50~150		JB-T 8571-1997
Base rated load	Dynamic load Cr (N)		4320
	Cor static load (N)		2250
Application field	All kinds of micro motors, cooling fans, instruments and meters, printers, smart home, precision instruments, machinery and equipment, household appliances, medical equipment, fishing gear, mining machinery, elevator and accessories industry, precision machine tools and other fields
Our company can customize, develop and produce all kinds of non-standard bearings according to customer requirements.

 

 

ATM machine, industrial encoder, optical encoder, office equipment printer, cloud billiards machine, gyroscope, synchronizer and servo system, etc

1. Material Introduction and Precautions: The 6902ZZ bearing is a specific type of deep groove ball bearing that provides smooth operation and supports radial loads. It is typically made from high-quality steel, such as chrome steel (AISI 52100) or stainless steel (AISI 440C), which offer excellent hardness, durability, and corrosion resistance. When handling the 6902ZZ bearing, it is important to observe the following precautions:

* Handle with clean hands to avoid contamination.

* Store in a clean and dry environment to prevent rust or damage.

* Avoid dropping or applying excessive force to the bearing, as it can lead to internal damage.

* Use appropriate tools during installation and removal to prevent distortion or deformation.

 

2. Usage Scenarios: The 6902ZZ bearing is commonly used in various applications, including:

* Electric motors: It provides smooth rotation and supports radial loads in motors and generators.

* Automotive industry: It can be found in transmissions, wheels, and different engine components.

* Industrial machinery: The bearing is suitable for use in conveyor systems, pumps, and general machinery.

* Robotics: It aids in the smooth movement of joints and actuators.

* Bicycle components: It is utilized in hubs, bottom brackets, and headset assemblies.

 

3. Bearing Precision: The precision of the 6902ZZ bearing is typically defined by the ABEC (Annular Bearing Engineering Committee) scale. The ABEC rating indicates the tolerance levels and manufacturing standards of the bearing. The higher the ABEC number (e.g., ABEC 5 or ABEC 7), the tighter the tolerances and higher the precision. However, it's important to note that ABEC ratings are not the sole determinant of bearing performance and other factors, such as load and operating conditions, should also be considered.

 

4. Lubrication: Proper lubrication is crucial for the optimal performance and longevity of the 6902ZZ bearing. The bearing should be lubricated with a suitable lubricant to reduce friction and prevent wear. Common lubricant options include:

* Grease: High-quality, high-speed bearing grease is recommended for most applications. It should have good temperature resistance, water resistance, and anti-corrosion properties.

* Oil: In certain high-speed or high-temperature applications, oil lubrication may be preferred. Consult the manufacturer's guidelines to determine the appropriate oil viscosity and lubrication intervals.

 

5. Installation and Fit of the Bearing: When installing the 6902ZZ bearing, the following guidelines should be followed:

* Ensure the shaft and housing are clean, smooth, and free from burrs.

* Gently press the bearing onto the shaft or into the housing using a suitable press tool or a mounting sleeve.

* Avoid striking the bearing directly during installation to prevent damage.

* Confirm the appropriate fit clearance between the bearing and the mating parts, considering factors such as operating temperature and load. It is recommended to refer to bearing manufacturer's guidelines or engineering specifications for specific fit recommendations.

 

6. Frequently Asked Questions and Answers:

Q1: What is the maximum operating temperature for the 6902ZZ bearing?

A1: The maximum operating temperature of the bearing depends on the material used. Standard chrome steel bearings can typically withstand temperatures up to 120°C (250°F), while stainless steel bearings offer higher temperature resistance, usually up to 300°C (570°F) or more.

 

Q2: Can the 6902ZZ bearing handle axial loads?

A2: The primary load-carrying capacity of the 6902ZZ bearing is radial. While it can handle some axial load, it is not designed for heavy thrust loads. To support significant axial loads, additional thrust bearings or appropriate bearing arrangements should be considered.

 

Q3: What is the expected service life of the 6902ZZ bearing?

A3: The service life of the bearing depends on various factors, including load, speed, lubrication, and operating conditions. It is recommended to consult the bearing manufacturer's technical data or use online bearing life calculators to estimate the expected service life based on specific application parameters.

 

Q4: Can the 6902ZZ bearing be disassembled and reassembled?

A4: The 6902ZZ bearing is not designed to be disassembled and reassembled. Attempting to disassemble the bearing may lead to damage or reduced performance. If replacement or maintenance is required, it is recommended to replace the entire bearing unit.

 

In conclusion, the 6902ZZ bearing is a high-quality deep groove ball bearing suitable for various applications. Its material, precision, lubrication, installation, and maintenance play vital roles in ensuring optimal performance and longevity. By following proper handling and maintenance practices, the bearing can provide reliable and efficient operation in a wide range of scenarios.

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