MGK QJ309 NMA C3 45x100x25 mm Four-Point Contact Ball Bearing

Industrial Applications and Use

The MGK QJ309 NMA C3 45x100x25 mm is a precision-engineered four-point contact ball bearing designed for demanding industrial applications. It handles both axial and radial loads simultaneously, making it an efficient alternative to paired angular contact bearings.

With a bore diameter of 45 mm, outer diameter of 100 mm and width of 25 mm, it is ideally suited for gearboxes, electric motors, machine tool spindles, and bearing housing units. This bearing type is often used in machinery where compact dimensions, high rigidity and consistent load distribution are essential.

Key Features and Advantages

• Four-point contact design - enables the bearing to support axial loads in both directions along with radial loads, reducing space and simplifying assembly.

• Brass cage (NMA) - machined brass cage guided on the outer ring ensures excellent stability, low friction and resistance to high temperatures and vibration.

• C3 internal clearance - provides additional space for thermal expansion and allows for smooth operation at higher speeds and under heavy load conditions.

• High durability and precision - MGK bearings are engineered with tight tolerances and quality steel, ensuring long service life in industrial drives and bearing housing units.

• Universal industrial compatibility - suitable for bearing housings, mechanical drive systems, compressors, pumps and general-purpose industrial equipment.

Technical Specifications

• Brand: MGK

• Model: QJ309 NMA C3

• Type: Four-point contact ball bearing

• Inner diameter (d): 45 mm

• Outer diameter (D): 100 mm

• Width (B): 25 mm

• Cage material: Machined brass (NMA)

• Internal clearance: C3 (increased)

• Load type: Combined axial and radial

• Applications: Gearboxes, electric motors, machine tools, pumps, bearing housings, industrial units

This bearing offers an excellent balance between load capacity and compactness, making it an ideal choice for industrial applications that require reliable shaft guidance and resistance to wear.

FAQ

1. What is a four-point contact bearing?
A four-point contact bearing is a type of angular contact ball bearing designed to support axial loads in both directions and radial loads at the same time, reducing the need for paired bearings.

2. What does the “NMA” designation mean?
“NMA” indicates that the bearing has a machined brass cage guided on the outer ring. This provides high mechanical stability and improves heat dissipation during continuous operation.

3. Why choose internal clearance “C3”?
The “C3” clearance allows for thermal expansion of the bearing components, ensuring smooth operation under high speed, temperature and load. It’s the preferred choice for demanding industrial environments.

4. What industries commonly use the QJ309 NMA C3 MGK bearing?
This model is widely used in industrial machinery, transmission systems, electric motors, compressors, agricultural equipment and bearing housing assemblies.

5. What are the main benefits for B2B buyers?
MGK bearings deliver long service life, reduced maintenance intervals, and strong resistance to wear, temperature and vibration. Combined with fast 24-hour delivery, they provide a cost-effective solution for production and maintenance operations.