Product Introduction

The 6200 series Deep Groove Ball Bearing belongs to the "light series" of single-row Deep Groove Ball Bearings; it is the most widely used, highest-volume, and most representative series among all deep groove Ball Bearings. Model numbers begin with "62" (e.g., 6204, 6205, 6206).

The structure of the 6200 series mirrors that of other single-row deep groove ball bearings, consisting of four main components: the inner ring, outer ring, steel balls, and cage. Options include ZZ dust shields or 2RS rubber seals. If deep groove ball bearings are considered the "general-purpose components" of the bearing world, the 6200 series is the "standard choice" within that category—it is rarely the wrong decision when there are no specific application constraints.

Single Row Deep Groove Ball Bearings represent the most typical bearing structure and have a wide range of applications. They primarily consist of an inner ring, an outer ring, steel balls (rolling elements), and a cage. In addition to open types, these bearings are available with steel dust shields (ZZ type), rubber seals (2RS type), or a snap ring groove on the outer ring's outside diameter (NR type). Pressed steel cages are commonly used.

Single Row Deep Groove Ball Bearings feature low frictional torque, making them ideal for environments requiring high speeds, low noise, and low vibration. They primarily support radial loads but can also withstand moderate axial loads in both directions. When radial internal clearance is increased, the bearing acquires characteristics similar to an angular contact ball bearing, allowing it to support alternating axial loads.

Structure and Characteristics

The light-series cross-section design provides the following characteristics:

Most Balanced: Achieves an optimal balance between outer diameter, width, load capacity, and rotational speed—an all-rounder with no weak points.

Most Versatile: Covers a full size range from miniature to large; used across all industries, making procurement and replacement highly convenient.

Best Cost-Performance Ratio: High production volume, mature manufacturing processes, and intense market competition result in the most affordable pricing.

High Rotational Speed: Limiting speeds are second only to the 6000 series, meeting the speed requirements of the vast majority of industrial equipment. Load Capacity: Moderate—stronger than the 6000 series but weaker than the 6300 series; suitable for medium-load operating conditions.

Dimensions Table

Common Suffixes

ZZ / 2Z: Double-sided metal shields; dust-proof but not waterproof; high speed; most commonly used.

2RS: Double-sided rubber seals; dust-proof, waterproof, and grease-leakage proof; maintenance-free; suitable for humid and dusty environments.

C3: Larger-than-standard internal clearance; commonly used in equipment with temperature rise, such as electric motors.

C2: Smaller-than-standard internal clearance; suitable for high-precision, low-vibration applications.

/P5: Precision class P5; higher precision than the standard grade.

M / TN9: Cage material; M denotes brass, TN9 denotes reinforced nylon.

Application Scenarios

The 6200 series is ubiquitous; key applications include:

Electric Motor Industry: Three-phase asynchronous motors, servo motors, micro-motors, and generators—the 6200 series is the primary choice for motor bearings.

Industrial Equipment: Water pumps, fans, speed reducers, gearboxes, conveyors, hoists, and packaging machinery.

Automotive Industry: Alternators, starters, fans, water pumps, A/C compressors, and wiper motors.

Home Appliance Manufacturing: Washing machines, air conditioners, refrigerators, vacuum cleaners, electric fans, and kitchen appliances.

Agricultural Machinery: Transmission components for tractors, harvesters, seeders, and rotary tillers.

Power Tools: Electric drills, angle grinders, cutters, and bench grinders.

Textile and Printing Machinery: Textile spindles, printing press rollers, and papermaking machinery.

Key Differences

For the same inner diameter, the differences between the series can be understood as follows:

6700/6800/6900 Series (Thin-section): Thinnest and lightest; very small outer diameter; lowest load capacity; used in precision, light-load applications with extremely limited space.

6000 Series (Extra-light): Thicker than the thin-section series; outer diameter remains relatively small; high speed; lower load capacity; suitable for compact, light-load, high-speed applications. 6200 Series (Light Series): The most balanced and versatile option with the highest usage volume—choose this by default unless there are specific constraints.

6300 Series (Medium Series): Sturdier and more robust, with larger outer diameters and widths; offers higher load capacity but lower rotational speeds—choose this for heavier loads.

6400 Series (Heavy Series): The most robust and largest in size, offering the highest load capacity; rarely used in practice, reserved only for extreme heavy-load applications.

Taking a 25mm inner diameter as an example: the 6205 has an outer diameter of 52mm, while the 6305 has an outer diameter of 62mm. The higher the series number, the thicker the outer ring, the larger the steel balls, the higher the load capacity, and the lower the rotational speed. The 6200 series represents the "just right" middle-ground choice.

Selection Recommendations

Default Choice: Unless there are specific space constraints or extreme load requirements, the 6200 series is the primary choice due to its superior versatility and cost-effectiveness.

Verify Load Capacity: Calculate service life based on actual radial and axial loads to ensure the bearing meets the equipment's design lifespan. The 6200 series has moderate load capacity; overloading can lead to premature failure.

Verify Rotational Speed: It is recommended that the actual operating speed does not exceed 80% of the limiting speed. The limiting speed for 2RS sealed bearings is approximately 20%–30% lower than that of ZZ shielded bearings.

Select Seal Type: Choose ZZ for dry, clean environments; 2RS for humid or dusty conditions; and open bearings for oil lubrication or ultra-high-speed applications.

Select Internal Clearance: Choose standard C0 for normal operating temperatures; C3 for applications involving temperature rise (such as electric motors); and C2 for precision, low-vibration applications.

Ensure Alignment: Deep groove ball bearings are not self-aligning; strict control of the coaxiality between the shaft and the housing bore is required.