KG 21310 CKW33 Spherical Roller Bearing
The KG 21310 CKW33 spherical roller bearing solves this problem fundamentally. Instead of round balls, it features two rows of barrel-shaped rollers. The magic lies in the "line contact"—the load is distributed along a steel line rather than a single point, allowing the bearing to handle significantly higher forces.
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Product Detail
Self-Aligning Spherical Roller Bearing 21310 CKW33 KG Brand | Robust, Efficient, and Ideal for 45mm Shafts (with H310 Sleeve)
This comprehensive guide is designed for procurement officers, maintenance technicians, and production managers. It explains the features, applications, and technical essentials of the KG-branded 21310 spherical roller bearing in simple, non-technical language. If you are looking for a reliable, smooth, and shock-resistant solution for restricted spaces, this overview is for you.
What is the 21310 KG Bearing, and why choose it?
In industrial machinery, when you need smooth shaft rotation combined with heavy loads and sudden vibrations, standard ball bearings often fall short. In regular ball bearings, contact between the ball and the race occurs at a tiny "point." Under heavy load, this point can suffer from fatigue, leading to denting, seizure, and eventually, production downtime.
The KG 21310 CKW33 spherical roller bearing solves this problem fundamentally. Instead of round balls, it features two rows of barrel-shaped rollers. The magic lies in the "line contact"—the load is distributed along a steel line rather than a single point, allowing the bearing to handle significantly higher forces.
Furthermore, this bearing is self-aligning. Due to operating heat, motor speed fluctuations, or belt tension, shafts often suffer from slight bending or angular misalignment. The spherical raceway design of the 21310 allows the rollers to compensate for these deviations without jamming, keeping your system running smoothly.
Why the 213 Series? (Balance of Strength and Space)
You might wonder how the 213 series differs from heavier series like 222 or 223. The answer is simple:
- Compact Design: With a width of exactly 27mm, it is an ideal choice for machinery with limited housing space where a larger bearing wouldn't fit.
- Low Internal Friction: The design allows the rollers to operate with minimal resistance, meaning your motor consumes less power to turn the shaft.
- Lower Heat Generation: Due to its streamlined cage design, it generates less heat at high speeds compared to heavy-duty series, making it perfect for standard industrial speeds.
Decoding the 21310 CKW33
Every letter and number on the bearing box tells a story about its engineering:
- 213: Denotes the spherical roller bearing series with a standard width-to-diameter ratio.
- 10: Size code. Standard rule: 10 × 5 = 50mm base inner bore (before mounting).
- C: Indicates a reinforced stamped steel cage design without a center rib, allowing for free-flowing lubricant.
- K: This is critical—it means the inner bore is tapered (1:12 slope). It cannot be mounted directly; it requires an adapter sleeve.
- W33: Features an outer ring lubrication groove and three oil holes, making re-lubrication possible without disassembling the housing.
Technical Specifications & Dimensions
Required Accessories: H 310 Adapter Kit
Remember, the "K" in the part number means the bore is tapered. Do not attempt to mount this directly onto a 50mm shaft. To secure it onto a standard 45mm shaft, you must use the following assembly kit:
- Adapter Sleeve: Model H 310. This sits between the shaft and the bearing to ensure a tight fit.
- Lock Nut: Model KM 10. Used to tighten the bearing onto the sleeve.
- Lock Washer: Model MB 10. Prevents the nut from loosening due to vibration.
*Recommendation: Always order the H310 sleeve, KM10 nut, and MB10 washer together with your KG bearing to ensure perfect compatibility.
Common Industrial Applications
Thanks to its durability and compact size, this bearing is a workhorse in various fields:
- Industrial Fans & Blowers: Providing steady rotation for high-speed propellers.
- Electric Motors & Generators: Handling belt tension without placing stress on the rotor.
- Conveyor Systems: Ideal for food, packaging, and bottling lines.
- Centrifugal Pumps: Compensating for misalignment during fluid handling.
- Agricultural Machinery: Resisting dust and debris, ensuring reliable operation.
Installation Guide: Getting it Right
Over 80% of premature failures in tapered bearings result from incorrect tightening. Follow these 4 simple steps:
- Clean the Shaft: Ensure the 45mm shaft is free of rust, burrs, or dirt. Apply a thin layer of light oil.
- Positioning: Slide the H 310 sleeve onto the shaft, then place the bearing onto the sleeve. Install the MB 10 washer and KM 10 nut.
- Tightening (The "Feel" Test): Tighten the KM nut carefully. Do not over-tighten until the bearing is locked stiff; it should still rotate smoothly with light friction when turned by hand.
- Locking: Finally, bend one of the tabs on the MB 10 washer into the slot on the KM 10 nut to ensure it never vibrates loose.
Frequently Asked Questions
1. Can I mount this on a 50mm straight shaft?
No. This is a tapered-bore (K) bearing. If you need a direct mount on a 50mm shaft, you need the version without the "K" (model 21310 CW33). The CKW33 variant requires an H310 sleeve and is intended for a 45mm shaft.
2. Why is the KG brand so popular?
KG is widely respected for offering an excellent balance between material quality, precision manufacturing, and cost-effectiveness, making it a trusted choice for industrial applications across the Middle East.
3. How much grease should I use?
Fill the space between the rollers inside the bearing fully with quality grease. However, do not overfill the housing cavity (leave about 50-70% free space) to allow room for the grease to move and keep the bearing cool.
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