NACHI 7303 Bearing — Specifications, Dimensions & Cross-Reference

The NACHI 7303 is a angular contact ball bearing manufactured by NACHI. It belongs to the 7300 series and features dimensions of 17 × 47 × 14 mm (bore × OD × width). This bearing has a dynamic load rating of 13,500 N and a static load rating of 6,550 N, making it suitable for medium-duty applications.

Technical Specifications

Dimensions
Bore Diameter (d)	17 mm
Outside Diameter (D)	47 mm
Width (B)	14 mm
Weight	0.107 kg

Performance
Dynamic Load Rating (Cr)	13,500 N
Static Load Rating (C₀r)	6,550 N
Limiting Speed (Grease)	15,000 rpm
Limiting Speed (Oil)	18,000 rpm

💡 Application Note: The 7300 series bearings are commonly used in heavy-duty machine tool spindles, large pumps, and high-speed turbines.

Brand Cross-Reference — 7303 Equivalents

The following bearings from other manufacturers are interchangeable with the NACHI 7303. All share identical dimensions (17×47×14mm) and comparable load ratings:

Brand	Part Number	Dynamic Load (N)	Static Load (N)
NACHI	NACHI 7303 ✦	13,500	6,550
SKF	SKF 7303	13,500	6,550
NTN	NTN 7303	13,500	6,550
KOYO	KOYO 7303	13,500	6,550
FAG	FAG 7303	13,500	6,550
Timken	Timken 7303	13,500	6,550
NSK	NSK 7303	13,500	6,550
NTN	NTN 7303	13,500	6,550
SKF	SKF 7303	13,500	6,550

Available Variants

The NACHI 7303 base bearing is available in these configurations:

NACHI 7303-NR

Open with snap ring

NACHI 7303-ZZ-C3

Double shielded, C3 clearance

NACHI 7303-2RS-C3

Double sealed, C3 clearance

NACHI 7303-C3

Open, C3 clearance

NACHI 7303-2Z

Double metal shielded (ISO)

NACHI 7303-ZZ

Double metal shielded

NACHI 7303-2RS

Double rubber sealed

Frequently Asked Questions

What are the dimensions of the NACHI 7303?

The NACHI 7303 has a bore diameter of 17mm, outside diameter of 47mm, and width of 14mm. It weighs 0.107kg.

What is the load capacity of the NACHI 7303?

The dynamic load rating (Cr) is 13,500 N and the static load rating (C₀r) is 6,550 N. The maximum recommended speed is 15,000 rpm with grease lubrication or 18,000 rpm with oil lubrication.

What bearings are equivalent to NACHI 7303?

The 7303 is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 17×47×14mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.