Needle roller bearing MCGILL MI 21 N

MCGILL MI 21 N is a needle roller bearing reference, within Bearings. Request a quote for MI 21 N via WhatsApp or email with the quantity you need; we respond promptly with lead time and equivalents.

The MCGILL MI N series needle roller bearing is a reduced radial section component that works with cylindrical needles as rolling elements. It is used when radial space is limited and radial loads must be supported with a contained outer diameter. MR Accesorios Industriales supplies this MCGILL line, an official brand that MR carries, and helps you identify the correct part number for your application.

The MI N series designation is read step by step: the letters MI identify the needle roller bearing family, the number that follows indicates the size or shaft diameter for which mounting is intended, and the suffix N distinguishes a construction variant within that same series. Therefore, it is best to read the complete part number: MI 6 N, MI 7 N, MI 8 N, MI 9 N, MI 10 N, MI 11 N, MI 12 N and MI 13 N are some of the available sizes. The number is not a nominal diameter expressed in millimeters: it is an internal series reference that corresponds to a specific shaft. To avoid mistakes, send us the part number exactly as it appears on the drawing or on the old part.

These needle roller bearings are chosen in Argentine industries where radial space is critical: machine tools, transmission equipment, pumps, compressors, conveyors, agricultural machinery and material handling equipment. They also appear in automation applications and in assemblies where the goal is to reduce housing size without sacrificing radial load capacity. Because they have a thin section, they allow more compact supports to be designed than with a ball bearing of the same bore diameter. MR Accesorios Industriales supplies them for replacement and for new projects.

To select the correct bearing, verify the shaft diameter, housing diameter and available width, as well as the radial load and lubrication conditions. Mounting requires cleanliness, alignment between shaft and housing, and a raceway or rolling surface in good condition, because the needles work directly on it. If the environment has dust, chips or moisture, consider additional sealing or a protected variant. Lubrication must be suitable for the operating speed and temperature, and it is advisable to check radial clearance after mounting.

Regarding equivalences, needle roller bearings are identified by their designation and by standardized dimensions, not by a universal part number. Different brands may use their own nomenclature for the same size; therefore, interchangeability is confirmed by comparing bore diameter, outer diameter, width and construction type, not just the part number. If you have a number from another brand, send us the part data and we will help you find the equivalent MCGILL reference within the MI N series.

If you already know the part number, write to us on WhatsApp with the complete designation, for example MI 8 N or MI 12 N, and we will quote you promptly. If you are not sure about the suffix or size, send us a photo of the part, the drawing or the shaft and housing measurements. At MR Accesorios Industriales we will respond with the reference that corresponds to your equipment.

This description provides guidance on the product type. Check the configuration and dimensions of this reference.