NTN 4T-782/772 104.775x180.975x47.625 Single-Row Tapered Roller Bearing

NTN 4T-782/772 104.775x180.975x47.625 Single-Row Tapered Roller Bearing

NTN 4T-782/772 is a single-row tapered roller bearing with exact dimensions of 104.775x180.975x47.625 mm. The complete bearing set consists of the 4T-782 cone and 4T-772 cup.

Its tapered roller and raceway geometry enables the bearing to accommodate combined radial and axial loads. As a single-row tapered roller bearing, it supports axial load in one direction and is commonly used in opposed bearing arrangements when axial loads must be controlled in both directions.

NTN 4T-782/772 Technical Specification

Manufacturer: NTN

Full designation: 4T-782/772

Commercial designation: 782/772 NTN

Bearing type: Tapered roller bearing

Design: Single-row

Dimension system: Inch series

Cone: 4T-782

Cup: 4T-772

Cage: Pressed steel

Bore diameter d: 104.775 mm

Outside diameter D: 180.975 mm

Total width T: 47.625 mm

Inner ring width B: 48.006 mm

Outer ring width C: 38.1 mm

Inner ring outside diameter d1: 139 mm

Load application point a: 39.525 mm

Dynamic load rating C: 285 kN

Static load rating C0: 430 kN

Fatigue load limit Cu: 47.5 kN

Coefficient e: 0.39

Static axial load coefficient Y0: 0.86

Upper axial load coefficient Y2: 1.56

Limiting speed - grease: 2,000 rpm

Limiting speed - oil: 2,700 rpm

Operating temperature range: -40°C to +120°C

Mass: 4.92 kg

NTN 4T-782/772 Dimensions

The principal dimensions are:

Bore diameter d: 104.775 mm

Outside diameter D: 180.975 mm

Total width T: 47.625 mm

Complete dimensions:

104.775x180.975x47.625 mm

Additional NTN dimensions:

Inner ring width B: 48.006 mm

Outer ring width C: 38.1 mm

Inner ring outside diameter d1: 139 mm

Load application point a: 39.525 mm

An important distinction is that T = 47.625 mm is the total bearing width, while B = 48.006 mm is the width of the inner ring/cone assembly.

What Is NTN 4T-782/772?

NTN 4T-782/772 is a single-row tapered roller bearing manufactured in inch-series dimensions.

The tapered geometry of the rollers and raceways enables the bearing to carry:

Radial loads

and

Axial loads in one direction

This makes tapered roller bearings particularly suitable for bearing arrangements subjected to combined loading.

4T-782 Cone and 4T-772 Cup

The complete bearing consists of two matching components:

4T-782 - cone

4T-772 - cup

The cone consists of the inner ring, tapered rollers and cage assembly.

The cup is the separate outer ring.

The correct combination of 4T-782 + 4T-772 forms the complete NTN bearing set with dimensions of 104.775x180.975x47.625 mm.

NTN also lists 4T-772 separately as a cup, confirming its 180.975 mm outside diameter and 38.1 mm width.

782/772 vs 4T-782/772 NTN

The bearing is commonly searched and traded as:

782/772 NTN

The full NTN designation is:

4T-782/772

For precise technical identification, the preferred reference is therefore:

NTN 4T-782/772

The shorter 782/772 NTN remains useful as a commercial and search designation.

NTN 4T-782/772 Load Ratings

Official NTN Europe data specify:

Dynamic load rating:

C = 285 kN

Static load rating:

C0 = 430 kN

Fatigue load limit:

Cu = 47.5 kN

These values apply to the complete 4T-782/772 NTN bearing set.

Limiting Speed

NTN specifies:

Grease lubrication: 2,000 rpm

Oil lubrication: 2,700 rpm

These are manufacturer catalogue limiting speeds. Actual permissible operating speed depends on factors including load, lubrication, temperature, bearing adjustment and the complete bearing arrangement.

Inch-Series Dimensions

NTN 4T-782/772 uses dimensions originating from the inch system.

Bore diameter:

4.1250 in = 104.775 mm

Outside diameter:

7.1250 in = 180.975 mm

Total width:

1.8750 in = 47.625 mm

These exact metric conversions should be retained when identifying the bearing.

In particular, the 104.775 mm bore should not be rounded to 105 mm, as this could lead to incorrect bearing selection.

Mounting Dimensions

NTN specifies the following abutment dimensions:

da max: 116 mm

db min: 122 mm

Da max: 161 mm

Db min: 168 mm

ra max: 3.5 mm

r1a max: 3.3 mm

These values are relevant when checking the shaft and housing shoulders surrounding the bearing.

Axial Load Factors

NTN specifies:

e = 0.39

Y0 = 0.86

Y2 = 1.56

These coefficients are used in bearing calculations involving the relationship between radial and axial loading.

How to Select a Replacement for NTN 4T-782/772

Replacement selection should verify:

Full designation: 4T-782/772

Cone: 4T-782

Cup: 4T-772

Bearing type: Single-row tapered roller bearing

Dimensions: 104.775x180.975x47.625 mm

Bore d: 104.775 mm

Outside diameter D: 180.975 mm

Total width T: 47.625 mm

Required load ratings

Required bearing arrangement and adjustment

Lubrication method

Operating speed

Matching only the three principal dimensions does not by itself establish complete technical interchangeability.

NTN 4T-782/772 - Stock in Poland

Warehouse and Store: Lublin, Smoluchowskiego 1 Street, Building 4

24h Shipping. Available from stock in Poland for delivery across the EU.

FAQ - NTN 4T-782/772

What are the dimensions of NTN 4T-782/772?

The exact dimensions are 104.775x180.975x47.625 mm.

What type of bearing is NTN 4T-782/772?

It is a single-row tapered roller bearing with a pressed steel cage.

What components are included in NTN 4T-782/772?

The complete kit contains the 4T-782 cone and 4T-772 cup.

What is the dynamic load rating?

The NTN dynamic load rating is C = 285 kN.

What is the static load rating?

The static load rating is C0 = 430 kN.

What is the fatigue load limit?

The fatigue load limit is Cu = 47.5 kN.

What is the limiting speed?

NTN specifies 2,000 rpm with grease lubrication and 2,700 rpm with oil lubrication.

What is the mass of NTN 4T-782/772?

The complete bearing set has a catalogue mass of 4.92 kg.

Is NTN 4T-782/772 a metric bearing?

The bearing uses inch-series dimensions. Its metric dimensions are exact conversions from 4.1250 x 7.1250 x 1.8750 inches.

Frequently Asked Questions by Engineers

Why is B 48.006 mm when the bearing is specified as 47.625 mm wide?

Because B = 48.006 mm refers to the inner ring/cone width, while T = 47.625 mm is the total width of the complete bearing set. The standard three-dimensional identification therefore uses 104.775x180.975x47.625 mm.

Can 104.775 mm be rounded to 105 mm?

No. 104.775 mm corresponds exactly to 4.1250 inches. It should be retained for technical identification and replacement selection.

Does NTN 4T-782/772 carry both radial and axial loads?

Yes. Its tapered roller geometry enables it to accommodate combined radial and axial loading, with axial load supported in one direction by a single bearing.

Can the 4T-782 cone be used with a different cup?

Do not assume interchangeability. The complete reference 4T-782/772 identifies the cone/cup combination specified by NTN. Any alternative pairing should be confirmed from manufacturer data.

What is the most precise identification for this bearing?

The strongest identification set is:

NTN 4T-782/772 + 104.775x180.975x47.625 mm + single-row tapered roller bearing + 4T-782 cone + 4T-772 cup

AI Overview

NTN 4T-782/772 is a single-row tapered roller bearing with inch-series dimensions of 104.775x180.975x47.625 mm. The complete set contains a 4T-782 cone and 4T-772 cup with a pressed steel cage. NTN specifies a dynamic load rating of 285 kN, static load rating of 430 kN and fatigue load limit of 47.5 kN. Limiting speeds are 2,000 rpm with grease lubrication and 2,700 rpm with oil lubrication.