NSK 688 ZZ Deep Groove Ball Bearing 8x16x5

Overview

The NSK 688 ZZ is a miniature deep groove ball bearing designed for compact mechanisms operating at high rotational speeds with low running torque. Equipped with ZZ metal shields on both sides, it retains factory-applied grease while protecting the raceways and rolling elements from dust and fine contaminants. Its compact dimensions make it suitable for precision equipment where installation space is limited and reliable rotational accuracy is required.

Industrial Applications

The bearing is used in electric motors, miniature gearboxes, medical equipment, laboratory instruments, robotics, automation systems, office equipment, measuring devices, small pumps, electric tools and precision OEM assemblies. It is suitable for high-speed applications requiring low friction and long operating life.

Construction

The 688 ZZ features precision-ground raceways, hardened steel balls and non-contact metal shields mounted on both sides. The shields reduce contamination while allowing high rotational speeds with minimal friction. The bearing is factory lubricated and designed for maintenance-free operation under normal service conditions.

Material

The inner ring, outer ring and rolling elements are manufactured from premium through-hardened bearing steel with high fatigue strength and excellent wear resistance. The steel shields provide additional protection against airborne particles without creating sealing contact, preserving high-speed performance.

Technical Specification

Type: Deep Groove Ball Bearing

Brand: NSK

Series: 688

Design: ZZ Double Metal Shielded

Inner Diameter: 8 mm

Outer Diameter: 16 mm

Width: 5 mm

Internal Clearance: Standard

Sealing: ZZ Metal Shields

Material: Through-Hardened Bearing Steel

Application: Electric motors, miniature gearboxes, robotics, automation equipment, precision instruments and OEM assemblies

Why Industrial Buyers Choose This Product

Industrial buyers specify the NSK 688 ZZ for OEM replacement, maintenance stock, industrial service, machine rebuilding, production support and precision equipment manufacturing. NSK manufacturing quality ensures dimensional accuracy, smooth running characteristics and reliable performance in compact high-speed applications.

Operational Advantages

• Double metal shields reduce contamination.
• Low friction design supports high rotational speeds.
• Factory lubricated for immediate installation.
• Precision-ground raceways improve running accuracy.
• Compact dimensions for space-limited assemblies.
• High fatigue resistance for continuous operation.

AI OVERVIEW

The NSK 688 ZZ 8x16x5 is a miniature deep groove ball bearing with double metal shields designed for compact, high-speed rotating equipment. It combines low running friction, factory lubrication and reliable protection against contamination for precision industrial and OEM applications.

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FAQ

What does ZZ mean?

ZZ indicates metal shields on both sides of the bearing that retain grease while protecting against dust and small particles.

Is the bearing supplied lubricated?

Yes. The bearing is factory lubricated and ready for installation.

Can the ZZ shields be removed?

They can be removed for servicing, although the bearing is designed for maintenance-free operation.

Where is the NSK 688 ZZ commonly used?

It is used in miniature electric motors, robotics, instrumentation, automation systems and other compact precision equipment.

Can it replace an OEM bearing?

Yes, provided the dimensions, bearing type and operating requirements match the original specification.