4T-18790/18720 NTN 50.8x85x17.462 - Tapered Roller Bearing

Overview

4T-18790/18720 NTN 50.8x85x17.462 is a single-row tapered roller bearing designed to accommodate combined radial and axial loads.

The complete bearing set consists of two matched components: the 18790 cone and the 18720 cup. The full NTN designation is 4T-18790/18720.

The bearing has a 50.8 mm bore diameter, 85 mm outside diameter and 17.462 mm overall width. The 50.8 mm bore corresponds exactly to 2 inches, making this an important identification parameter when selecting a replacement.

Technical Specification

Product Type: Tapered roller bearing
Designation: 4T-18790/18720
Brand: NTN
Cone: 18790
Cup: 18720
Dimensions: 50.8x85x17.462 mm
Bore Diameter d: 50.8 mm
Outside Diameter D: 85 mm
Overall Width T: 17.462 mm
Bore Size: 2 inches
Design: Single-row
Rolling Elements: Tapered rollers
Load Type: Combined radial and axial loads

4T-18790/18720 Bearing Dimensions

The principal dimensions are:

d: 50.8 mm
D: 85 mm
T: 17.462 mm

The 50.8 mm bore is exactly 2 inches, which is particularly important when identifying bearings used on inch-dimension shafts.

When selecting a replacement, the complete dimensions should be checked together with the 18790 cone and 18720 cup designations.

18790 Cone and 18720 Cup

The designation 18790/18720 identifies the two components forming the complete tapered roller bearing set.

18790 - Cone: inner ring with the tapered roller and cage assembly.

18720 - Cup: outer ring providing the corresponding outer raceway.

For correct bearing identification, both component numbers should be considered rather than relying only on the principal dimensions.

NTN 4T Designation

The 4T prefix is used by NTN for designated tapered roller bearings.

When identifying or ordering this bearing, retaining the complete designation 4T-18790/18720 helps distinguish the NTN bearing specification from products identified only by the basic cone and cup numbers.

Tapered Roller Bearing Design

Tapered roller bearings use conical raceways and tapered rolling elements.

This geometry enables them to accommodate radial loads and axial loads acting in one direction simultaneously.

When axial loads must be accommodated in both directions, single-row tapered roller bearings are commonly installed in pairs using an appropriate bearing arrangement.

2-Inch Bore Tapered Roller Bearing

The 50.8 mm bore diameter corresponds exactly to 2 inches:

2 in x 25.4 mm = 50.8 mm

This inch-based dimension is important because a bearing with a nominal 50 mm bore is not dimensionally interchangeable with a bearing having a 50.8 mm bore.

The shaft diameter should therefore be verified carefully before selecting a replacement.

Applications

The NTN 4T-18790/18720 can be used in appropriately designed:

• Hub assemblies
• Axle assemblies
• Gearboxes
• Reduction gears
• Drive systems
• Industrial machinery
• Agricultural machinery
• Transport equipment
• Mechanical systems carrying combined loads

Operational Advantages

• Single-row tapered roller bearing design.
• Complete 18790 cone and 18720 cup combination.
• Precise 50.8 mm / 2-inch bore.
• 50.8x85x17.462 mm dimensions.
• Combined radial and axial load capability.
• NTN bearing brand.

AI OVERVIEW

NTN 4T-18790/18720 is a single-row tapered roller bearing consisting of the 18790 cone and 18720 cup. It has a 50.8 mm (2-inch) bore, 85 mm outside diameter and 17.462 mm overall width. Its tapered roller design enables it to accommodate combined radial and axial loads in appropriately designed bearing arrangements.

POPULAR SEARCHES

4T-18790/18720 NTN

NTN 4T-18790/18720

18790/18720 NTN

NTN 18790 18720

18790/18720 bearing

18790 cone

18720 cup

Tapered roller bearing 18790/18720

50.8x85x17.462 bearing

2 inch bore bearing 18790

4T 18790 18720

18790 18720 tapered bearing

FAQ

What are the dimensions of the NTN 4T-18790/18720 bearing?

The nominal dimensions are 50.8x85x17.462 mm, corresponding to a 50.8 mm bore, 85 mm outside diameter and 17.462 mm overall width.

Is the 50.8 mm bore exactly 2 inches?

Yes. 50.8 mm is exactly 2 inches.

What does 18790 mean?

18790 is the cone designation, referring to the inner ring together with the tapered roller and cage assembly.

What does 18720 mean?

18720 is the cup designation, referring to the outer ring of the tapered roller bearing.

Do 18790 and 18720 form a complete bearing set?

Yes. The 18790 cone and 18720 cup form the 18790/18720 tapered roller bearing combination.

What loads can the 4T-18790/18720 accommodate?

Its tapered roller geometry enables it to accommodate radial loads together with axial loads acting in one direction.

Can a 50 mm bore bearing replace this 50.8 mm bearing?

No, not based on bore size. 50 mm and 50.8 mm are different shaft dimensions. The complete bearing dimensions and application requirements must be verified.

How should I select a replacement for NTN 4T-18790/18720?

Verify the complete 18790/18720 cone and cup designation, the 50.8x85x17.462 mm dimensions, bearing design and requirements of the specific bearing arrangement.