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NA 4913 Single Row Needle Roller Bearing

Delivery is not included and is calculated separately
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PART.FSKFC30CUSNA4913
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NA 4913 Single Row Needle Roller Bearing – Machined Rings with Flanges

Delivery is not included and is calculated separately based on location.

The NA 4913 is a high-performance single-row needle roller bearing engineered for applications requiring high radial load capacity in a compact footprint. Featuring machined rings and numerous cylindrical rollers, this bearing provides exceptional stiffness and durability, making it ideal for heavy-duty industrial and agricultural machinery.

Advanced Load Handling & Lubrication

This bearing is designed with two integral flanges on the outer ring to guide the rollers and provide axial stability. To ensure long-term reliability in the field, the outer ring includes an annular groove with lubrication holes, allowing for easy relubrication during maintenance cycles. Its low cross-sectional height allows for streamlined machine designs without sacrificing power or stability.

Operational Flexibility: The NA 4913 features a separable design, allowing for easier mounting and dismounting. It is specifically engineered to accommodate axial displacement in both directions from the normal position, making it highly adaptable to thermal expansion or shaft variations.

Technical Specifications

Specification Imperial (in) Metric (mm)
Bore Diameter (d) 2.5591 in 65 mm
Outside Diameter (D) 3.5433 in 90 mm
Width (B) 0.9843 in 25 mm
Raceway Diameter (F) 2.8346 in 72 mm
Chamfer Dimension (r1,2) 0.0394 in 1.0 mm
Permissible Axial Displacement (s) 0.0591 in 1.5 mm
Main Features
  • Machined Outer Ring: Features two integral flanges for superior axial guidance of the needle rollers.
  • High Roller Density: Maximises the contact surface area for superior load distribution.
  • Separable Components: The inner and outer rings can be mounted independently, simplifying complex assembly processes.
  • Precision Chamfering: Designed for clean fitment within housing abutments (3.3465 in diameter).
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Troubleshoot Bearing Temperatures - Decanter Maintenance

A simple rule for troubleshooting bearing temperatures: No more than 180°F (82°C) on the housing. The bearing outer ring can be up to 20°F (11°C) hotter than the housing.
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Trouble Shooting Bearing Temperatures

Preventative Maintenance

A simple rule for troubleshooting bearing temperatures: No more than 180°F (82°C) on the housing. The bearing outer ring can be up to 20°F (11°C) hotter than the housing. The lubricant originally specified for the application was likely selected to run at lower temperatures. A temperature increase of 50°F (28°C) may cause oil viscosity to drop by 50% or more. This could be the "tipping point" for the application, causing it to go from a hot (but stable) condition, to a hotter, unstable condition where thermal runaway occurs. Eventually, it doesn't matter how much lubricant you add to the application: the oil film is too thin inside the bearing to prevent metal-to-metal contact. Friction and heat build up, which could lead to catastrophic machinery seizure.

A better procedure for "hot" bearings would be:
  1. Check the housing surface temperature. It might be OK, even though most people find anything over 130°F (55°C) too hot to touch.
  2. Slowly add the proper amount of fresh grease to the application (use SKF Dialset). If it's a motor or other machine with a grease relief, open the relief and allow excess grease to escape.
  3. Monitor the temperature and make sure it doesn't run away. (You'll often get a temperature spike after adding grease as the bearing ejects the excess into the housing. This might take 30 minutes to several hours to stabilize, depending on the size of the machine.)
  4. If the temperature keeps going up, call for help - you will probably have to shut down and investigate.

Catastrophic failures can have untold consequences. Contact SKF or The Olive Centre, we can help you with temperature issues in bearings. A simple call could save you time, money and perhaps someone's life.

Why the type of bearing is fitted is important to the application?

Mechanical Tree Shaker Preventive‑Maintenance Guide - HUB

Mechanical tree shakers are the backbone of modern olive and nut harvesting, delivering the high-frequency vibrations needed to detach fruit efficiently. But the same forces that maximise yield also put extreme stress on the machine itself. Without a structured preventive-maintenance program, vibration can quickly loosen fasteners, wear through hydraulic hoses, rub down electrical insulation, and accelerate pump and bearing failure.
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