NACHI 6903-2RS Bearing — Specifications, Dimensions & Cross-Reference

The NACHI 6903-2RS is a deep groove ball bearing double rubber sealed manufactured by NACHI. It belongs to the 6900 series and features dimensions of 17 × 30 × 7 mm (bore × OD × width). This bearing has a dynamic load rating of 3,450 N and a static load rating of 2,070 N, making it suitable for light-duty applications.

Technical Specifications

Dimensions
Bore Diameter (d)17 mm
Outside Diameter (D)30 mm
Width (B)7 mm
Weight0.016 kg
Performance
Dynamic Load Rating (Cr)3,450 N
Static Load Rating (C₀r)2,070 N
Limiting Speed (Grease)20,000 rpm
Limiting Speed (Oil)28,000 rpm
💡 Application Note: The 6900 series bearings are commonly used in office equipment, small electric motors, and light industrial applications. The -2RS suffix indicates double rubber contact seals, providing excellent protection against dust, moisture, and contaminants — ideal for harsh operating environments.

Brand Cross-Reference — 6903-2RS Equivalents

The following bearings from other manufacturers are interchangeable with the NACHI 6903-2RS. All share identical dimensions (17×30×7mm) and comparable load ratings:

BrandPart NumberDynamic Load (N)Static Load (N)
NACHINACHI 6903-2RS ✦3,4502,070
KOYO KOYO 6903-2RS 3,450 2,070
FAG FAG 6903-2RS 3,450 2,070
Timken Timken 6903-2RS 3,450 2,070
NTN NTN 6903-2RS 3,450 2,070
NSK NSK 6903-2RS 3,450 2,070
SKF SKF 6903-2RS 3,450 2,070

Available Variants

The NACHI 6903 base bearing is available in these configurations:

NACHI 6903-ZZ-C3
"Double shielded
NACHI 6903-ZZ
Double metal shielded
NACHI 6903-NR
Open with snap ring
NACHI 6903-C3
"Open
NACHI 6903-2Z
Double metal shielded (ISO)
NACHI 6903-2RS-C3
"Double sealed
NACHI 6903
Open (no seal/shield)

Frequently Asked Questions

What are the dimensions of the NACHI 6903-2RS?

The NACHI 6903-2RS has a bore diameter of 17mm, outside diameter of 30mm, and width of 7mm. It weighs 0.016kg.

What is the load capacity of the NACHI 6903-2RS?

The dynamic load rating (Cr) is 3,450 N and the static load rating (C₀r) is 2,070 N. The maximum recommended speed is 20,000 rpm with grease lubrication or 28,000 rpm with oil lubrication.

What bearings are equivalent to NACHI 6903-2RS?

The 6903-2RS is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 17×30×7mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.