Heavy duty Needle Bearing 1. HK,BK,HF,HFL series 2. high speed,low noise ... machine,Toys etc , We make full type needle roller bearings :1)Drawn cup needle roller bearings : HK , BK , HK RS , HK ... Cage assemblies : K , K-ZW ,K-K ,K-ZWD series3) Heavy duty needle roller bearings : NK , NKS , RNA49,RNA69,RNA48,NKI,NKIS ...