NSK 1203-ZZ Bearing — Specifications, Dimensions & Cross-Reference

The NSK 1203-ZZ is a self-aligning ball bearing double metal shielded manufactured by NSK. It belongs to the 1200 series and features dimensions of 17 × 40 × 12 mm (bore × OD × width). This bearing has a dynamic load rating of 7,020 N and a static load rating of 2,240 N, making it suitable for light-duty applications.

Technical Specifications

Dimensions
Bore Diameter (d)	17 mm
Outside Diameter (D)	40 mm
Width (B)	12 mm
Weight	0.056 kg

Performance
Dynamic Load Rating (Cr)	7,020 N
Static Load Rating (C₀r)	2,240 N
Limiting Speed (Grease)	15,000 rpm
Limiting Speed (Oil)	19,000 rpm

💡 Application Note: The 1200 series bearings are commonly used in conveyor rollers, textile machinery, and applications with shaft misalignment. 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 — 1203-ZZ Equivalents

The following bearings from other manufacturers are interchangeable with the NSK 1203-ZZ. All share identical dimensions (17×40×12mm) and comparable load ratings:

Brand	Part Number	Dynamic Load (N)	Static Load (N)
NSK	NSK 1203-ZZ ✦	7,020	2,240
Timken	Timken 1203-ZZ	7,020	2,240
SKF	SKF 1203-ZZ	7,020	2,240
NACHI	NACHI 1203-ZZ	7,020	2,240
KOYO	KOYO 1203-ZZ	7,020	2,240
Timken	Timken 1203-ZZ	7,020	2,240
FAG	FAG 1203-ZZ	7,020	2,240
NTN	NTN 1203-ZZ	7,020	2,240
SKF	SKF 1203-ZZ	7,020	2,240

Available Variants

The NSK 1203 base bearing is available in these configurations:

NSK 1203-NR

Open with snap ring

NSK 1203-ZZ-C3

Double shielded, C3 clearance

NSK 1203-2RS-C3

Double sealed, C3 clearance

NSK 1203-C3

Open, C3 clearance

NSK 1203-2Z

Double metal shielded (ISO)

NSK 1203-2RS

Double rubber sealed

NSK 1203

Open (no seal/shield)

Frequently Asked Questions

What are the dimensions of the NSK 1203-ZZ?

The NSK 1203-ZZ has a bore diameter of 17mm, outside diameter of 40mm, and width of 12mm. It weighs 0.056kg.

What is the load capacity of the NSK 1203-ZZ?

The dynamic load rating (Cr) is 7,020 N and the static load rating (C₀r) is 2,240 N. The maximum recommended speed is 15,000 rpm with grease lubrication or 19,000 rpm with oil lubrication.

What bearings are equivalent to NSK 1203-ZZ?

The 1203-ZZ is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 17×40×12mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.