NSK 6307 DU Deep Groove Ball Bearing 35x80x21 mm

Applications and Technical Specifications of the NSK 6307 DU Bearing

The NSK 6307 DU bearing (dimensions 35x80x21 mm) is a single-row deep groove ball bearing designed for high-precision industrial applications. This model features one-side rubber sealing (DU), providing enhanced protection against dust, dirt, and moisture — extending bearing life even in demanding environments.

Thanks to its robust steel construction and optimized internal geometry, the 6307 DU bearing delivers reliable performance under both radial and axial loads. It is widely used in electric motors, gearboxes, conveyors, pumps, and general machinery where high durability, low friction, and quiet operation are essential.

Its standard metric dimensions (35 mm bore x 80 mm outer diameter x 21 mm width) ensure compatibility with common bearing housings and industrial units. The rubber seal on one side retains lubricant and prevents contaminants from entering the raceway, which reduces maintenance requirements and ensures consistent performance over time.

Technical Data

• Manufacturer: NSK

• Type: Single-row deep groove ball bearing

• Model: 6307 DU (sealed on one side)

• Inner diameter (d): 35 mm

• Outer diameter (D): 80 mm

• Width (B): 21 mm

• Material: High-grade bearing steel

• Load type: Radial + moderate axial load

• Operating temperature range: -20 °C to +120 °C

• Applications: Industrial drives, pumps, electric motors, gearboxes, agricultural and construction machinery

FAQ

Q1: What does the “DU” suffix mean in the NSK 6307 DU bearing?
A1: “DU” indicates a rubber seal on one side of the bearing, designed to protect against contamination and retain lubricant.

Q2: Can the NSK 6307 DU handle axial loads?
A2: Yes, although primarily intended for radial loads, its deep-groove raceways allow it to sustain moderate axial forces in both directions.

Q3: What lubrication is recommended for this bearing?
A3: Pre-lubricated with high-quality grease suitable for most industrial environments. For extreme conditions, re-lubrication may be performed according to the operating cycle.

Q4: What are common industrial applications?
A4: The bearing is used in electric motors, fans, conveyor rollers, reducers, and other rotating equipment requiring compact and efficient bearings.

Q5: Is this bearing available for immediate shipment?
A5: Yes, stocked in Lublin for fast order fulfillment — typically shipped within 24 hours.