Gearbox Roller Bearing NP030522 / NP378917 27.1x51.4x13.2/9.8mm

Timken NP030522 / NP378917 Tapered Roller Bearing

27.1mm Bore × 51.4mm OD × 13.2mm Width

The Timken NP030522 / NP378917 is an NP-series tapered roller bearing designed for use in gearboxes, differentials, and axles. NP-series bearings are non-standard components found in specialised applications — it is strongly recommended to purchase by part number rather than by dimension alone.

Key Specifications

• Part Numbers: NP030522 / NP378917
• Full Reference: NP030522-90KM1 / NP 030522/378917
• Brand: Timken
• Inside Diameter: 27.10 mm
• Outside Diameter: 51.40 mm
• Width: 13.20 mm

Cross-Reference Part Numbers

• NP030522-90KM1
• 55181939 (FIAT)
• NP 030522/378917
• 0 53893 75408 6

Frequently Asked Questions

What makes NP bearings different from standard tapered roller bearings?

NP-series Timken bearings are engineered for specific gearbox, differential, and axle positions where standard metric or inch bearings are not interchangeable. Always match by part number.

Is the FIAT number 55181939 a direct cross-reference?

Yes — 55181939 is listed as a cross-reference part number for this Timken NP030522 bearing, indicating use in Fiat applications.

What is included in this listing?

This listing includes the matched cup (outer ring) and cone (inner ring + roller assembly) as a set.

Can I buy just the cup or cone separately?

Please contact us if you require individual components — we can advise on availability.

Why Choose Eco Torque?

Eco Torque specialises in gearbox bearings including hard-to-find NP-series Timken components. We stock genuine Timken and premium aftermarket equivalents with expert support for matching parts to your application.

Need Help Finding the Right Part?

Send us your UK registration number or VIN and we will confirm this part is correct for your gearbox.

Reference Number: ET2222