INA NK28/20-D-XL needle roller bearing

INA NK28/20-D-XL 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 NK28/20-D-XL and any equivalents.

The INA NK-D-XL is a single-row radial needle roller bearing that comes without an inner ring. It is made to carry high radial loads while taking up very little radial space, and it runs directly on a hardened and ground shaft. That keeps the surrounding design simple and light. You will find it in machine tools, transmission equipment and other industrial mechanisms where room is limited but load capacity still matters.

Reading the code helps you pick the right size. In NK, you have a needle roller bearing with no inner ring, a machined outer ring and a needle cage. After the slash, the first number is the nominal bore diameter and the second is the total width; so NK20/16-D-XL means a 20 mm bore and a 16 mm width. The D tells you the outer ring has two ribs, and XL marks the high-quality execution made to the manufacturer's internal standard. Check these figures against the space you have on the shaft and in the housing.

These bearings show up in machine tools, transmission equipment, pumps, compressors, fans and conveying systems. Because they handle radial loads in a small envelope, they suit gearboxes, camshafts and oscillating mechanisms, as well as equipment in the automotive, textile and food industries and in agricultural machinery, where precision and a robust build are expected.

Selection starts with the shaft. It has to be hardened and ground, with suitable roughness, because the shaft itself acts as the raceway. Keep the shaft and housing aligned to avoid unexpected axial loads. Grease or oil both work for lubrication, depending on speed range and operating temperature. How you seal the assembly depends on the application design, and extra seals are often needed to keep contaminants out. An interference fit on the outer ring plus correct radial clearance supports reliable running.

On interchangeability: needle roller bearings without an inner ring follow international standards, so one brand can replace another when the main dimensions and tolerances match. INA is a reference brand, and other manufacturers offer similar designations, though suffixes may differ. Before substituting, verify the needle circle diameter, the width, and the load and speed conditions. If anything is unclear, our technical team can help.

To request a quote, send the complete part number, such as NK20/16-D-XL, or the shaft and housing dimensions, through WhatsApp or email. We help you identify the correct reference and answer questions about installation, lubrication or applications.