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Product Series of Automation-Related Precision Ball Screws and Linear Rails – High-Precision Ball Screws

NSK Bearings Tapered Roller Bearings HR303/28

Product Overview

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Tapered Roller Bearings/Bearings

HR303/28

HR Series High-Capacity Tapered Roller Bearing

NSK Distributor Taiwan

Product Features

NSK HR series high-capacity tapered roller bearing, model HR303/28: 28 mm bore, 68 mm outer diameter, 19.75 mm width
Basic dynamic load rating Cr 68000 N, basic static load rating C0r 55500 N (NSK official catalog CAT. No. E1103d)
Limiting speed approx. 6000 min⁻¹ (grease), 8000 min⁻¹ (oil)
HR series conforms to ISO specifications for outer ring back face raceway diameter, width and contact angle, allowing international interchangeability — suited to machine tools, gearboxes and other heavy-duty drives

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Product Description

The HR303/28 is an NSK HR series high-capacity tapered roller bearing: 28 mm bore, 68 mm outer diameter, 19.75 mm width. Basic dynamic load rating Cr is 68000 N and basic static load rating C0r is 55500 N (NSK official catalog CAT. No. E1103d). The HR series carries a J suffix and conforms to ISO specifications for outer ring back face raceway diameter, width and contact angle, allowing international interchangeability of inner ring assembly and outer ring — offering higher load capacity than standard tapered roller bearings of the same size. Commonly used in machine tool spindles, gearboxes and rolling mills, typically paired (back-to-back DB or face-to-face DF arrangement).

For current spec and catalog cross-reference, please inquire: Nahshon is NSK's distributor in Taiwan with full part-number lookup and sourcing support — add the part number to your inquiry list and we will confirm the current code, spec and quote with the factory; sourcing support is also available for discontinued models.

FAQ

What's the difference between the Z, ZZ and DDU suffixes?

Z means a single-side steel shield, ZZ means steel shields on both sides, and DDU means contact rubber seals on both sides. Shields suit general environments and high speeds; rubber seals give better dust and water protection with slightly higher friction torque — choose based on your dust exposure and lubrication method.

When should I choose C3 clearance instead of standard clearance?

For motors or other applications with noticeable temperature rise, or high-speed operation, the inner ring expands from heat and reduces the clearance — choose C3 in that case. Standard clearance is fine for general room-temperature, low-speed use. See Nahshon's technical resources for a clearance selection guide.

Is HR303/28 in stock in Taiwan? What is the lead time?

Nahshon is the NSK distributor in Taiwan and keeps stock of some commonly used items. Add HR303/28 to your inquiry list or give us a call, and we'll confirm stock, lead time and quote.