NSK NA4920TT needle roller bearing

NSK NA4920TT belongs to needle roller bearing, part of our Bearings range. Tell us how many you need by WhatsApp or email and we'll get back to you promptly with a quote for NA4920TT and any equivalents.

For equipment where radial space is tight but radial loads are significant, the NSK NA series needle roller bearing is a practical option. It uses a machined inner ring and a steel cage that guides the needles, allowing moderate to high speeds. Typical installations include transmissions, pumps, compressors, electric motors and agricultural machinery. MR Industrial Accessories supplies this series to customers across the United States and in several Latin American countries.

The part number tells you most of what you need. NA means the bearing has a machined inner ring. The digits that follow refer to the bore or to a standard size within the series: in NA49/28TT, the 28 is the 28 mm bore; in NA4900TT, the 00 indicates a standard size in the 49 series. The TT suffix means contact seals on both sides, which keep lubricant in and contaminants out. Other common references include NA69/22TT, NA69/28TT and NA69/32TT, where the 69 series sets the width and load capacity.

These bearings appear in automotive, agricultural, metallurgical and food processing plants. You will find them in transmission cases, hydraulic pumps, compressors, electric motors, machine tools, material handling equipment, printing press rollers and linear guide systems. Their value is in carrying high radial loads in a small envelope, which suits small-diameter shafts running at moderate or high speeds.

When selecting an NA bearing, start with the shaft diameter, the radial load and the operating environment. Choose the TT seal for dusty or damp conditions; it blocks contaminants and prevents lubricant loss. For high-speed operation, confirm that lubrication is sufficient and that internal clearance can accommodate thermal expansion. During mounting, keep the shaft and housing aligned and avoid impacts that could damage the needles or seals. Grease or oil lubrication is possible, depending on the application.

Interchangeability is straightforward if the dimensions and sealing type match. NSK NA bearings can be replaced by equivalents from other brands that follow the same dimensional designation, such as SKF, FAG, NTN or INA, but always verify bore, outer diameter, width, load capacity and limiting speed. If you are unsure, send us the original code and we will point you to a compatible alternative.

To request a quote, send the complete part number by WhatsApp or email. If you cannot find the exact size, share the code or model and we will quote it. Our team can also suggest equivalents and help you choose the right variant for your application.