Timken 7303-C3 Bearing — Specifications, Dimensions & Cross-Reference

The Timken 7303-C3 is a angular contact ball bearing with C3 clearance manufactured by Timken. 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. The -C3 suffix indicates greater-than-normal radial internal clearance, recommended for applications with temperature differentials or tight shaft/housing fits.

Brand Cross-Reference — 7303-C3 Equivalents

The following bearings from other manufacturers are interchangeable with the Timken 7303-C3. All share identical dimensions (17×47×14mm) and comparable load ratings:

Brand	Part Number	Dynamic Load (N)	Static Load (N)
Timken	Timken 7303-C3 ✦	13,500	6,550
SKF	SKF 7303-C3	13,500	6,550
NTN	NTN 7303-C3	13,500	6,550
KOYO	KOYO 7303-C3	13,500	6,550
FAG	FAG 7303-C3	13,500	6,550
NACHI	NACHI 7303-C3	13,500	6,550
NSK	NSK 7303-C3	13,500	6,550
SKF	SKF 7303-C3	13,500	6,550
NTN	NTN 7303-C3	13,500	6,550

Available Variants

The Timken 7303 base bearing is available in these configurations:

Timken 7303-NR

Open with snap ring

Timken 7303-ZZ-C3

Double shielded, C3 clearance

Timken 7303-2RS-C3

Double sealed, C3 clearance

Timken 7303-2Z

Double metal shielded (ISO)

Timken 7303-ZZ

Double metal shielded

Timken 7303-2RS

Double rubber sealed

Timken 7303

Open (no seal/shield)

Frequently Asked Questions

What are the dimensions of the Timken 7303-C3?

The Timken 7303-C3 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 Timken 7303-C3?

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 Timken 7303-C3?

The 7303-C3 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.