NSK 6902 DD Ball Bearing

Main Description

The NSK 6902 DD deep‑groove ball bearing (15x28x7 mm) is a precision-engineered, single-row ball bearing designed for demanding industrial applications. It features a 15 mm bore, 28 mm outside diameter, and 7 mm width, making it a compact and reliable solution for installations where space and performance must align seamlessly.

Industrial Applications

This deep-groove bearing is particularly well-suited for bearing housings, motor shafts, and compact bearing units used in industrial machinery, automation systems, gearboxes, and drive assemblies. Thanks to its sealed construction, it offers reliable performance in environments where contamination resistance and low maintenance are critical.

Key Advantages

• Sealing (DD): Features rubber contact seals on both sides, protecting the bearing from dust and debris while retaining lubricant, which dramatically extends service life and reduces maintenance frequency.

• Thin-Section Design: The slim profile (15x28x7 mm) enables its use in constrained spaces and compact assemblies without compromising structural integrity.

• High Durability: Constructed from high-grade bearing steel, this NSK bearing offers excellent wear resistance and long-term reliability under radial loads.

• Smooth Operation: With a sheet-steel cage and standard internal clearance, it ensures stable, low-friction rotation in both static and dynamic applications.

• Optimized for Speed: Designed to operate efficiently at moderate to high rotational speeds, suitable for many industrial systems.

Technical Specifications

• Bore (d): 15 mm

• Outer Diameter (D): 28 mm

• Width (B): 7 mm

• Bearing Type: Single-row deep-groove ball bearing

• Sealing: DD (two-sided rubber contact seals)

• Material: High-quality bearing steel

• Cage: Sheet-steel cage (metal)

• Dynamic Load Rating: ~4,750 N

• Static Load Rating: ~2,260 N

• Maximum Speed (Grease): ~17,000 rpm (lubricated)

This bearing is engineered for high reliability with low friction, good sealing, and compact dimensions — delivering outstanding value in industrial and mechanical systems.

FAQ

Q1: What does “DD” mean in the bearing name?
A1: “DD” indicates that this bearing has contact rubber seals on both sides, protecting the internal components from dust and contaminants while keeping lubrication inside.

Q2: Is this bearing considered a thin-section type?
A2: Yes, the 15x28x7 mm dimensions classify it as a thin-section deep groove bearing, ideal for tight assemblies and space-constrained units.

Q3: What industrial uses is the NSK 6902 DD best suited for?
A3: It is widely used in bearing housings, motor shafts, compact units, gearboxes, automation systems, and other industrial machinery that require durable, sealed bearings.

Q4: How does its speed capability compare?
A4: With its design and materials, the bearing supports moderate to high speeds. The manufacturer rating for grease lubrication is around 17,000 rpm.

Q5: Does this bearing require frequent maintenance?
A5: Thanks to its sealed design, the bearing retains grease effectively, which reduces the need for frequent relubrication, making it more maintenance-friendly in industrial settings.