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Needle Roller Bearings: SKF NA/NK/HK Series | SKF pneumatic product available at Shri Narayan Machinery LLP Noida
SKF

Needle Roller Bearings: SKF NA/NK/HK Series

When radial space runs out, SKF needle roller bearings pack the most load capacity into the thinnest cross-section of any rolling bearing, with rollers at 3:1 to 10:1 length-to-diameter ratios. Three constructions cover the range: NA with machined inner ring for precision shafts, NK full-complement for maximum load at low speed, and HK drawn cup with a stamped shell where every millimetre counts. Bores run 5mm to 120mm, crowned roller ends shrug off slight misalignment, and cage-guided types spin to 20,000 RPM. Automotive gearbox rebuilders, printing press engineers, and textile machinery shops in Noida-NCR order NA 4905, NK 25/16, and HK 2016 regularly. Stocked at Sector 9, Noida; WhatsApp your designation for price.

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Type: Needle Roller (various configurations)Series Available: NA (with inner ring), NK (full complement), HK (drawn cup)Bore Size Range: 5mm to 120mmOuter Diameter Range: 10mm to 165mm

Key Features

Most compact bearing type, highest radial load capacity per unit cross-section
NA series with machined inner ring for precision shaft support
NK series full complement (no cage) for maximum load in low-speed applications
HK series drawn cup, stamped outer ring shell for ultra-compact installations
Crowned roller ends prevent edge stress and tolerate slight misalignment
High rigidity and low deflection under load, ideal for oscillating motion
Available with integral seals for grease retention in contaminated environments
Cage-guided variants maintain roller orientation for higher speeds

Technical Specifications

TypeNeedle Roller (various configurations)
Series AvailableNA (with inner ring), NK (full complement), HK (drawn cup)
Bore Size Range5mm to 120mm
Outer Diameter Range10mm to 165mm
Width Range6mm to 45mm
Dynamic Load Rating (max)Up to 180 kN (NA series, large sizes)
Static Load Rating (max)Up to 260 kN
Limiting SpeedUp to 20,000 RPM (cage-guided, small bores)
Roller L/D Ratio3:1 to 10:1
Cage MaterialPressed steel or polyamide
Seal OptionsOpen or with integral seals (RS suffix)

Applications

The Needle Roller Bearings is used across a wide range of industrial applications:

  • Automotive gearboxes, planet gear shaft bearings in automatic transmissions
  • Engine rocker arms and cam followers, oscillating motion under high frequency
  • Printing machinery, ink rollers, impression cylinders, and paper feed mechanisms
  • Textile machinery, guide rollers, tensioners, and thread take-up mechanisms
  • Hydraulic pumps and motors, piston pin and swash plate bearings
  • Packaging machines, compact roller guides for film and foil handling
  • Robot joints, compact, high-stiffness bearings for articulated arms

Industries Served

Automotive & Transmission ManufacturingPrinting & PackagingTextile & ApparelHydraulic Systems & Mobile EquipmentRobotics & Automation

Need Needle Roller Bearings? Get the Best Dealer Price

As your SKF dealer, Shri Narayan Machinery LLP offers competitive pricing on the full Needle Roller Bearings range. Call us for availability and your best quote.

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C-101, Sector 9, Noida, Uttar Pradesh 201301 | SKF Dealer

Frequently Asked Questions: Needle Roller Bearings

Choose needle roller bearings when radial space is severely limited and the bearing must fit within a very small cross-section. They excel in applications with oscillating or slow rotational motion and high radial loads — transmission gears, cam followers, rocker arms. They cannot handle axial loads and are generally limited to lower speeds than ball bearings. For high-speed, combined-load applications, deep groove ball bearings remain the better choice.

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