SKF RNA 6901 needle roller bearing

SKF RNA 6901 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 RNA 6901 and any equivalents.

For tight radial envelopes where a standard bearing will not fit, the SKF RNA series needle roller bearing offers a practical answer: it runs without an inner ring, so the needles roll directly on the shaft. That keeps the cross-section small and the weight low while still handling significant radial load. Typical installations include transmissions, pumps, compressors and farm equipment. MR Industrial Accessories supplies this line to customers in the US and Latin America.

Reading an RNA code is straightforward once you know the pattern. The RNA prefix means the bearing has no inner ring. What follows identifies the size and design. When a slash appears, the digits before it belong to the section series and the digits after it give the shaft diameter in millimeters. Suffixes can point to cage type, tolerance class or special treatment, so confirm the full code before ordering. Four-digit numbers generally indicate larger shaft diameters.

These bearings suit positions where radial room is scarce but the load is not light. You will find them in gearboxes, water pumps, reciprocating compressors, harvesters and material handling equipment, as well as in machine tool spindles and support rollers. Because the section is so thin, they can replace bushings in mechanisms that oscillate or rotate continuously. The shaft itself acts as the raceway, so its machining and finish matter.

Selection starts with the shaft. Hardness and roughness must meet raceway requirements, or the bearing will not reach its expected life. Lubrication, whether grease or oil, depends on speed and operating temperature. Sealing follows the environment: add external seals where dust or moisture is present. Shaft and housing must align precisely to avoid extra loads. During mounting, never strike the needles directly, and verify radial clearance after installation. If the shaft is worn, consider a repair sleeve.

Needle roller bearings without an inner ring follow international dimensional standards, so a similar code from another maker may interchange. Tolerances and load ratings are not always identical, though. Compare shaft diameter, outer diameter and width before committing. The safest route when replacing an existing bearing is to send the complete code engraved on the part.

To request a quote, send the code on WhatsApp or by email. The team at MR Industrial Accessories replies promptly, can suggest equivalents and helps you confirm the right designation for your application.