Needle Roller Bearings
Needle Roller Bearings (NRB) use cylindrical rollers, defined as needle rollers by their length to diameter ratio, for high power density in small envelopes. These bearings can use either drawn outer shells or machined outer rings and may be supplied with or without a machined and ground inner ring. Inner rings may be supplied separately or the bearing can ride directly on a hardened and ground shaft of appropriate design.
Series Prefixes
- NA - machined needle roller bearings to DIN 617/ISO 1206, with inner ring
- RNA - machined needle roller bearings to DIN 617/ISO 1206, without inner ring
- NK - machined needle roller bearing, light series, without inner ring
- NKI - machined needle roller bearing, light series, with inner ring
- NKS - machined needle roller bearing, heavy series, without inner ring
- NKIS - machined needle roller bearing, light series, with inner ring
- NAO - machined needle roller bearing, light series, without ribs on either ring
- RNAO - machined needle roller bearing, light series, without inner ring, without ribs on outer ring
Suffixes
- n/a - steel cage
- -TV - polyamide cage
- -XL - x-life from Schaeffler
