NSK HM 803149 tapered roller bearing

NSK HM 803149 belongs to tapered 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 HM 803149 and any equivalents.

For equipment that has to carry radial and axial forces at the same time, the NSK HM series is a single-row tapered roller bearing built around inch-based dimensions. Its tapered geometry produces progressive linear contact, which translates into high load capacity and rigidity in a compact envelope. Typical mounting points include gearboxes, machine tool spindles and general transmission equipment.

Reading the code is straightforward. The HM prefix marks the series, and the digits that follow identify the cone-and-cup assembly, so each complete number covers one specific combination. Examples in this family include HM 218210, HM 218248, HM 81610, HM 81649, HM 88510, HM 88542, HM 88547 and HM 88638. Any suffix that appears after the digits points to a design variant, such as a different contact angle or radius. When you send us the full part number, we can match it without guesswork.

In service, these bearings show up in power transmission units, gearboxes, road machinery, cranes, presses and machine tool spindles. They also appear in agricultural equipment such as seeders and harvesters, and in metallurgical operations. The common thread is an assembly where the shaft takes radial and axial load simultaneously and the fit has to stay rigid and precise.

Selecting the right one means looking at four things: the radial load, the axial load, the operating speed and the surrounding environment. During mounting, alignment matters, and the internal clearance is set axially, so adjustment has to be done carefully. Grease or oil both work as lubrication depending on the application, and the sealing arrangement should reflect how much contamination is present. Where vibration or elevated temperature is part of normal operation, it is worth reviewing material and treatment options.

Bearings in this series can be exchanged with equivalent part numbers from other manufacturers that use the same inch-based nomenclature. That said, interchange is never automatic: dimensions, contact angle and load capacity all need to be checked. If you are holding a number from another brand, or a part you cannot identify, send it over and we will point you to the compatible alternative.