NTN 7E-HMK3220 needle roller bearing

NTN 7E-HMK3220 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 7E-HMK3220 and any equivalents.

The NTN HMK series is a radial needle roller bearing with a steel cage and no inner ring. It handles high radial loads while taking up very little radial space, so it can sit directly on a hardened and ground shaft. Typical uses include gearboxes, pumps, compressors and textile equipment. MR Industrial Accessories supplies the HMK series to customers across the United States and Latin America.

Reading the HMK part number helps you match a replacement quickly. HMK identifies the series: a needle roller bearing with a steel cage and no inner ring. The following digits give the bore and the width in millimeters. Take the 7E-HMK2616: 26 mm bore, 16 mm width. The 7E-HMK3220 is 32 mm bore by 20 mm width, and the 7E-HMK4025 is 40 mm bore by 25 mm width. The 7E prefix marks a standard NTN execution variant.

These bearings suit gearboxes, water and oil pumps, compressors, machine tools and transmission equipment. Because the profile is thin, they fit where radial space is limited. They appear in equipment from well-known builders and as spares for imported machines.

When selecting an HMK bearing, check the shaft diameter and the width you have available. With no inner ring, the shaft itself serves as the raceway, so its surface hardness and roughness matter. Grease or oil lubrication works, depending on speed and operating temperature. Shaft and housing alignment must be precise to avoid unwanted axial loads. Press the bearing in with suitable tools; never strike the rollers directly.

Interchange is possible with other brands that use the same dimensional nomenclature, such as SKF, FAG or NSK, provided bore, outer diameter and width match. Tolerances and cage type can differ between manufacturers, so confirm them. For a safe swap, send the complete original part number to a specialist.

To request a quote for an NTN HMK series needle roller bearing, send the part number or dimensions by WhatsApp or email. The team replies promptly, can suggest equivalents and can help with lubrication and mounting questions.