NACHI 6908-ZZ Bearing — Specifications, Dimensions & Cross-Reference

The NACHI 6908-ZZ is a deep groove ball bearing double metal shielded manufactured by NACHI. It belongs to the 6900 series and features dimensions of 40 × 62 × 12 mm (bore × OD × width). This bearing has a dynamic load rating of 10,100 N and a static load rating of 6,950 N, making it suitable for medium-duty applications.

Technical Specifications

Dimensions
Bore Diameter (d)	40 mm
Outside Diameter (D)	62 mm
Width (B)	12 mm
Weight	0.080 kg

Performance
Dynamic Load Rating (Cr)	10,100 N
Static Load Rating (C₀r)	6,950 N
Limiting Speed (Grease)	10,000 rpm
Limiting Speed (Oil)	14,000 rpm

💡 Application Note: The 6900 series bearings are commonly used in office equipment, small electric motors, and light industrial applications. The -ZZ suffix indicates double metal shields, offering good protection while maintaining lower friction than rubber seals — suitable for higher speed applications.

Brand Cross-Reference — 6908-ZZ Equivalents

The following bearings from other manufacturers are interchangeable with the NACHI 6908-ZZ. All share identical dimensions (40×62×12mm) and comparable load ratings:

Brand	Part Number	Dynamic Load (N)	Static Load (N)
NACHI	NACHI 6908-ZZ ✦	10,100	6,950
NTN	NTN 6908-ZZ	10,100	6,950
KOYO	KOYO 6908-ZZ	10,100	6,950
FAG	FAG 6908-ZZ	10,100	6,950
Timken	Timken 6908-ZZ	10,100	6,950
NTN	NTN 6908-ZZ	10,100	6,950
NSK	NSK 6908-ZZ	10,100	6,950
SKF	SKF 6908-ZZ	10,100	6,950

Available Variants

The NACHI 6908 base bearing is available in these configurations:

NACHI 6908-NR

Open with snap ring

NACHI 6908-ZZ-C3

Double shielded, C3 clearance

NACHI 6908-2RS-C3

Double sealed, C3 clearance

NACHI 6908-C3

Open, C3 clearance

NACHI 6908-2Z

Double metal shielded (ISO)

NACHI 6908-2RS

Double rubber sealed

NACHI 6908

Open (no seal/shield)

Frequently Asked Questions

What are the dimensions of the NACHI 6908-ZZ?

The NACHI 6908-ZZ has a bore diameter of 40mm, outside diameter of 62mm, and width of 12mm. It weighs 0.080kg.

What is the load capacity of the NACHI 6908-ZZ?

The dynamic load rating (Cr) is 10,100 N and the static load rating (C₀r) is 6,950 N. The maximum recommended speed is 10,000 rpm with grease lubrication or 14,000 rpm with oil lubrication.

What bearings are equivalent to NACHI 6908-ZZ?

The 6908-ZZ is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 40×62×12mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.