NACHI 6804-ZZ Bearing — Specifications, Dimensions & Cross-Reference

The NACHI 6804-ZZ is a deep groove ball bearing double metal shielded manufactured by NACHI. It belongs to the 6800 series and features dimensions of 20 × 32 × 7 mm (bore × OD × width). This bearing has a dynamic load rating of 2,700 N and a static load rating of 1,760 N, making it suitable for light-duty applications.

Technical Specifications

Dimensions
Bore Diameter (d)	20 mm
Outside Diameter (D)	32 mm
Width (B)	7 mm
Weight	0.016 kg

Performance
Dynamic Load Rating (Cr)	2,700 N
Static Load Rating (C₀r)	1,760 N
Limiting Speed (Grease)	19,000 rpm
Limiting Speed (Oil)	26,000 rpm

💡 Application Note: The 6800 series bearings are commonly used in precision instruments, medical devices, dental handpieces, and miniature mechanisms. 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 — 6804-ZZ Equivalents

The following bearings from other manufacturers are interchangeable with the NACHI 6804-ZZ. All share identical dimensions (20×32×7mm) and comparable load ratings:

Brand	Part Number	Dynamic Load (N)	Static Load (N)
NACHI	NACHI 6804-ZZ ✦	2,700	1,760
Timken	Timken 6804-ZZ	2,700	1,760
SKF	SKF 6804-ZZ	2,700	1,760
NTN	NTN 6804-ZZ	2,700	1,760
KOYO	KOYO 6804-ZZ	2,700	1,760
FAG	FAG 6804-ZZ	2,700	1,760
Timken	Timken 6804-ZZ	2,700	1,760
NSK	NSK 6804-ZZ	2,700	1,760
NTN	NTN 6804-ZZ	2,700	1,760
SKF	SKF 6804-ZZ	2,700	1,760

Available Variants

The NACHI 6804 base bearing is available in these configurations:

NACHI 6804-ZZ-C3

"Double shielded

NACHI 6804-NR

Open with snap ring

NACHI 6804-C3

"Open

NACHI 6804-2Z

Double metal shielded (ISO)

NACHI 6804-2RS-C3

"Double sealed

NACHI 6804-2RS

Double rubber sealed

NACHI 6804

Open (no seal/shield)

Frequently Asked Questions

What are the dimensions of the NACHI 6804-ZZ?

The NACHI 6804-ZZ has a bore diameter of 20mm, outside diameter of 32mm, and width of 7mm. It weighs 0.016kg.

What is the load capacity of the NACHI 6804-ZZ?

The dynamic load rating (Cr) is 2,700 N and the static load rating (C₀r) is 1,760 N. The maximum recommended speed is 19,000 rpm with grease lubrication or 26,000 rpm with oil lubrication.

What bearings are equivalent to NACHI 6804-ZZ?

The 6804-ZZ is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 20×32×7mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.