NACHI 6304-2RS Bearing — Specifications, Dimensions & Cross-Reference

The NACHI 6304-2RS is a deep groove ball bearing double rubber sealed manufactured by NACHI. It belongs to the 6300 series and features dimensions of 20 × 52 × 15 mm (bore × OD × width). This bearing has a dynamic load rating of 15,900 N and a static load rating of 7,800 N, making it suitable for medium-duty applications.

Technical Specifications

Dimensions
Bore Diameter (d)	20 mm
Outside Diameter (D)	52 mm
Width (B)	15 mm
Weight	0.138 kg

Performance
Dynamic Load Rating (Cr)	15,900 N
Static Load Rating (C₀r)	7,800 N
Limiting Speed (Grease)	13,000 rpm
Limiting Speed (Oil)	16,000 rpm

💡 Application Note: The 6300 series bearings are commonly used in heavy-duty electric motors, mining equipment, construction machinery, and industrial gearboxes. The -2RS suffix indicates double rubber contact seals, providing excellent protection against dust, moisture, and contaminants — ideal for harsh operating environments.

Brand Cross-Reference — 6304-2RS Equivalents

The following bearings from other manufacturers are interchangeable with the NACHI 6304-2RS. All share identical dimensions (20×52×15mm) and comparable load ratings:

Brand	Part Number	Dynamic Load (N)	Static Load (N)
NACHI	NACHI 6304-2RS ✦	15,900	7,800
Timken	Timken 6304-2RS	15,900	7,800
SKF	SKF 6304-2RS	15,900	7,800
NTN	NTN 6304-2RS	15,900	7,800
KOYO	KOYO 6304-2RS	15,900	7,800
FAG	FAG 6304-2RS	15,900	7,800
Timken	Timken 6304-2RS	15,900	7,800
NSK	NSK 6304-2RS	15,900	7,800
SKF	SKF 6304-2RS	15,900	7,800
NTN	NTN 6304-2RS	15,900	7,800

Available Variants

The NACHI 6304 base bearing is available in these configurations:

NACHI 6304-ZZ-C3

"Double shielded

NACHI 6304-ZZ

Double metal shielded

NACHI 6304-NR

Open with snap ring

NACHI 6304-C3

"Open

NACHI 6304-2Z

Double metal shielded (ISO)

NACHI 6304-2RS-C3

"Double sealed

NACHI 6304

Open (no seal/shield)

Frequently Asked Questions

What are the dimensions of the NACHI 6304-2RS?

The NACHI 6304-2RS has a bore diameter of 20mm, outside diameter of 52mm, and width of 15mm. It weighs 0.138kg.

What is the load capacity of the NACHI 6304-2RS?

The dynamic load rating (Cr) is 15,900 N and the static load rating (C₀r) is 7,800 N. The maximum recommended speed is 13,000 rpm with grease lubrication or 16,000 rpm with oil lubrication.

What bearings are equivalent to NACHI 6304-2RS?

The 6304-2RS is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 20×52×15mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.