Super precision bearing FAG NNU4938-S-K-M-SP

FAG NNU4938-S-K-M-SP is a special bearing reference, within Bearings. Request a quote for NNU4938-S-K-M-SP via WhatsApp or email with the quantity you need; we respond promptly with lead time and equivalents.

FAG super precision bearings of the NNU-S-K-M-SP series are high-accuracy cylindrical roller bearings designed for applications where running accuracy and rigidity are critical. They are used in machine tool spindles, rotary tables and measuring equipment. MR Accesorios Industriales supplies this line as an official brand, with technical advice to select the correct version for the application.

The NNU-S-K-M-SP series designation is read in blocks. The letters NNU indicate a double-row cylindrical roller bearing with ribs on the inner ring. The S denotes a special super precision version. The K indicates a tapered bore, which allows mounting with an adjustable interference fit. The M corresponds to the machined brass cage. The letters SP identify the super precision accuracy class. Examples such as NNU4920-S-K-M-SP or NNU4926-S-K-M-SP show how these suffixes are combined in practice.

These bearings are used in milling machine, grinding machine and machining center spindles, where speed and dimensional accuracy are decisive. They also appear in rotary tables of coordinate measuring machines, in precision boring heads and in dynamic testing equipment. In Argentine industry, we find them in high-end machining shops, tool factories and automotive plants that require very tight surface finishes.

To select the correct bearing, take into account the combined load, the maximum operating speed and the rigidity required by the spindle. The K tapered bore requires careful mounting: it is recommended to check the internal clearance after adjustment and to use a precision lock nut. Lubrication can be with grease or oil, depending on the thermal regime. Alignment between supports is critical; any misalignment reduces service life. Sealing will depend on the environment: in the presence of contaminants, evaluate additional protection.

As for equivalents, super precision bearings from other brands may offer similar performance, but dimensions and tolerances are not always directly interchangeable. It is essential to compare the accuracy class, the cage type and the internal design before replacing a FAG with another brand. The NNU-S-K-M-SP series has specific rigidity and load capacity characteristics that should be validated with the manufacturer or a specialist.

If you need a quote for a bearing from this series, send the complete part number by WhatsApp to MR Accesorios Industriales. With the exact model we can confirm availability and advise you on the right version for your equipment. We work with leading brands and provide technical support so that the selection is correct from the first order.

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