High Quality Super-Precision Double Row Cylindrical Roller Bearing for Industrial Heavy Machinery – Best Price From China Nn30/600kf1 Nmn30/600kw33 Nn30/6

  Double row cylindrical roller bearings are high-load, high-rigidity, and high-precision bearings widely used in machine tool spindles, heavy machinery, gearboxes, and other high-load, high-speed rotating equipment. These bearings feature a double-row roller structure, providing greater load capacity and higher rigidity compared to single-row cylindrical roller bearings. They are ideal for applications requiring high radial load support.

 

In precision machine tools, double row cylindrical roller bearings are widely used in machine tool spindles due to their high rigidity, high load capacity, and excellent rotational accuracy. Machine tool spindles must maintain high precision and stability while operating at high speeds. The design of these bearings minimizes thermal deformation and vibration, improving machining accuracy and efficiency. Additionally, their separable structure facilitates easy assembly and maintenance, enhancing equipment longevity and reliability.

The cages of double row cylindrical roller bearings are available in several materials, including:

1. Brass Cage: High strength and wear resistance, suitable for high-speed and heavy-load applications, widely used in machine tool spindles, aerospace equipment, and other precision fields.
2. Steel Cage: Typically made of stamped steel or machined steel, suitable for general industrial machinery, providing high load capacity and reliability.
3. Polyamide Cage: Made of nylon or other engineering plastics, lightweight with low friction, ideal for medium-speed applications such as electric motors and gearboxes.

The precision levels of double row cylindrical roller bearings are classified according to ISO, DIN, and GB/T standards. The common precision grades include:

• P0 (Normal Grade): Suitable for general industrial machinery with low precision requirements.
• P6 (Precision Grade): Used in applications with moderate precision requirements, such as medium-speed machine tools and precision transmission systems.
• P5 (High Precision Grade): Suitable for high-speed precision machine tools, measuring instruments, and aerospace applications.
• P4 (Super Precision Grade): Primarily used in precision grinding machines and spindle systems requiring extremely high rotational accuracy.
• P2 (Ultra Precision Grade): Applied in ultra-high precision industries, such as aerospace and semiconductor manufacturing.

Installation Instructions for Super-Precision Cylindrical Roller Bearings

Super-precision cylindrical roller bearings are designed for high-speed, high-precision applications such as machine tool spindles, aerospace equipment, and precision instruments. Proper installation is crucial to ensure optimal performance, longevity, and reliability. Follow the guidelines below for correct installation.

1. Preparation Before Installation

Ensure the work environment is clean to prevent contamination from dust or debris.

Check the bearing, shaft, and housing for any damage or burrs.

Verify the bearing model and suffixes to ensure it meets the application requirements.

Apply a thin layer of lubricant to the bearing seat and shaft.

2. Installation Methods

(1) Press-Fit Installation (For Small Bearings)

Use a press tool to apply uniform pressure to the bearing's inner ring when mounting on the shaft.

Avoid applying force to the rollers or outer ring to prevent damage.

(2) Heat Installation (For Medium & Large Bearings)

Heat the bearing to 80-100°C (176-212°F) using an induction heater.

Ensure even heating and avoid exceeding 120°C (248°F) to prevent material deformation.

Carefully slide the bearing onto the shaft while it is still expanded.

(3) Shrink Fit Installation (For Heavy-Duty Applications)

Cool the shaft using dry ice or liquid nitrogen to contract it slightly.

Quickly slide the bearing onto the shaft before it returns to its normal temperature.

3. Post-Installation Inspection

Rotate the bearing by hand to check for smooth movement and any abnormal noise.

Ensure the bearing is properly seated against the shoulder of the shaft or housing.

Measure the radial and axial clearance if necessary.

4. Bearing Suffix Explanation

Super-precision cylindrical roller bearings come with various suffixes indicating their specifications:

K - Tapered bore (1:12)

M - Machined brass cage

E - Enhanced capacity design (larger rollers for higher load capacity)

P4 / P2 - Super precision grades (ISO standard)

X - Special internal design for improved performance

C2 / C3 / C4 - Radial clearance class (C2: smaller than normal, C3/C4: larger than normal)

Understanding these suffixes helps in selecting the right bearing for specific applications.

5. Lubrication and Maintenance

Use high-quality grease or oil suitable for high-speed operation.

Regularly check for signs of wear, contamination, or unusual noise.

Avoid over-lubrication, which can cause overheating.

Q1: MOQ?
A: 10-5000 pcs customized for your brand bearings.
 

Q2: Are You A Trading Company Or Manufacturer?
A: We have the manufacturing bearings for more than 20 years, "Quality is our culture"

Q3: How Long Is Your Delivery Time?
A: Generally it is 5-8 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
 

Q4: What Causes Bearing Noise?
A. Bearing noise is a function of both the bearing and the way it is used. Some external factors that affect bearing noise include lubricant type, excessive bearing load, and improper installation. Once the abnormal noise occurs, you can contact our engineers, we will help you find the reasons and provide the appropriate solutions.