Z-506201.TR4 taper roller bearing 479.425×679.45mm
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Z-506201.TR4 taper roller bearing 479.425×679.45mm
What does a Z-506201.TR4 bearing fit, and what should a buyer check first? It is a four-row inch taper roller bearing with a 479.425 mm bore, 679.45 mm outside diameter and 495.3 mm width, typically used in large rolling-mill, gearbox and heavy equipment housings. Before price or lead time, confirm the housing fit, lubrication route and preload method; at 574 kg, handling and alignment matter as much as the rating.
At a glance
- Specification: Value
- Number: Z-506201.TR4
- Type: Tapered roller bearings, Four-row, in inch sizes
- Series: Z series (Z-5..TR4)
Installation Starts With the Housing, Not the Hammer
Installation begins with cleanliness and support. A Z-506201.TR4 is not a press-fit item to force with a drift; it is a large assembly whose rings must be kept square during every lift. Clean the shaft and housing, remove burrs, and check that oil holes, grooves and seal seats line up before the bearing goes in. Use lifting points on the housing or a suitable sling around the outer ring; never lift by the cage or rollers.
The preferred method is controlled heat or a mechanical assist that applies force to the ring being fitted. Heat should be uniform and below the supplier-approved limit; if the bearing is heated, have the fixtures ready so it does not cool before seating. Check runout of the shaft shoulder and housing face, because a square but eccentric seat will create edge loading in a four-row arrangement.
Specification Checkpoints Before Mounting
Use the data below as a pre-installation checkpoint; do not substitute approximate dimensions.
| Specification | Value |
|---|---|
| Number | Z-506201.TR4 |
| Type | Tapered roller bearings, Four-row, in inch sizes |
| Series | Z series (Z-5..TR4) |
| Bore | Z = cylindrical bore |
| Dimensions (d × D × B) | 479.425 mm × 679.45 mm × 495.3 mm |
| Weight | 574 kg |
| Cage | Sheet steel cages |
| Cr, radial | 10198939 N |
| Cor, radial | 22497664 N |
| Cur, radial | 2009865 N |
These figures are not marketing numbers. The 10198939 N Cr and 22497664 N Cor require a mounting plan that respects the mass, while the 2009865 N Cur is a reminder that fatigue life depends on clean lubrication and correct clearance. For other inch sizes, compare the Four row inch taper roller bearings category before changing the housing design.
Lubrication: Clean, Controlled and Consistent
Lubrication is where four-row taper bearings earn or lose their life. Supply clean oil or grease to all rows; a single oil hole that feeds only one side is not enough unless the housing has internal distribution grooves. For oil systems, maintain flow and temperature, and filter to the target cleanliness. For grease, choose a product with the base-oil viscosity and thickener compatible with the application, then confirm that grease can purge without pressurising seals.
Mixing lubricants is risky. If you change product, flush or verify compatibility; thickener incompatibility can soften the grease and release oil into the seal area. During the first runs, watch drain plugs and filter indicators for metal particles; early debris is not normal in a correctly cleaned housing.
Preload and Clearance: Follow the Application Design
Preload and clearance are set by the application design, not by feel. Four-row taper bearings are usually adjusted through the housing or shaft arrangement, and the correct value comes from the machine builder’s setting chart or the original engineering drawing. Measure axial clearance or preload with the bearing seated, rotate the assembly several times, and take readings at the specified temperature.
For Z-506201.TR4, do not use the bearing’s mass or dimensions to estimate preload. Too little preload allows roller skew and cage stress; too much raises friction and temperature. If the setting is unknown, stop and verify the arrangement rather than tightening by trial and error.
Maintenance, Inspection and Sourcing
Maintenance should be trend-based. Log temperature, vibration and lubricant condition after run-in, then compare against a baseline taken under the same load and speed. A sudden rise in temperature or a change in vibration spectrum often gives more warning than a visual inspection alone.
- Record baseline vibration, temperature and grease condition after run-in.
- Check oil flow, filter differential pressure and seal leakage at each planned shutdown.
- Inspect roller paths and cage pockets during major overhauls; look for edge loading, discoloration and debris indentations.
- Verify housing alignment and shaft deflection if vibration trends rise, rather than changing preload blindly.
When replacing, confirm the model through our bearing number reference, inspect the new bearing for rust protection and cage damage, and keep it packaged until the last moment. For Z-506201.TR4 replacement planning, include lifting capacity and housing access in the schedule. Contact FIJ Bearing to request a quote for this four-row inch taper roller bearing or a compatible size.