SKF NK 19/20 needle roller bearing

SKF NK 19/20 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 NK 19/20 and any equivalents.

The SKF NK series is a needle roller bearing that works without an inner ring, so the needles run directly on the shaft. That makes the bearing section smaller than a comparable ball or cylindrical roller bearing and lets it carry high radial loads in tight envelopes. MR supplies this series in the standard bore and width combinations, including sizes such as NK 12/12 and NK 16/20.

Reading the code is straightforward. After NK, the first number is the bore diameter in millimeters and the second is the bearing width, separated by a slash. So NK 12/12 gives a bore of 12 mm and a width of 12 mm, while NK 16/20 gives a bore of 16 mm and a width of 20 mm. The outer diameter comes from the series tables. Because there is no inner ring, the shaft itself becomes the inner raceway and must be hardened and ground to suit.

These bearings turn up in automotive work, machine tools, power transmission equipment, pumps, compressors and agricultural machinery. They are also used in gearbox repairs, electric motors and linear guidance systems. Typical duties include slow oscillation and pivot points where radial rigidity matters. The compact cross-section is the main reason for choosing NK over a ball bearing or cylindrical roller bearing when the housing diameter is limited.

Selection comes down to the radial load, the rotational speed and the operating environment. Check that the shaft surface has the right hardness, roughness and tolerances, since the needles depend on it. Alignment at mounting has to be accurate, and lubrication has to be adequate; needle rollers do not tolerate running dry. If the shaft is not prepared to act as a raceway, a bearing with an inner ring is the alternative, but the assembly dimensions will change.

Other manufacturers list needle roller bearings under similar designations, yet they are not always direct replacements. Prefixes, suffixes and numbering vary with the standard, and tolerances or load ratings can differ. Before substituting, confirm the critical dimensions and the operating conditions. MR can compare your reference against the SKF option and help you settle on the right one.

Send the part number of your SKF needle roller bearing by WhatsApp or email and the team will quote that exact size. If the number is missing or unclear, we can help identify the correct series or suffix. Bearings, housings, power transmission components and lubricants are all part of what we supply to maintenance and purchasing teams.