Chinese BK12 Fixed end bearing block

**Steel** · 11-03-2017

Hi, Can someone please give me there professional opinion on what bearing type this diagram represents on the BK12 fixed side shown in the attached photo.
Cheers in advance.

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**JAZZCNC** · 11-03-2017

BK is Fixed end and consists of of 2 angular contact bearings held and preloaded within the housing. The photo shows all sizes depending on end machining and screw diameter. IE: Bk12 being used for 16mm screws Bk15 20mm etc.

BF is the floating end and just uses normal bearing which floats within the housing and is held onto the ballscrew with a Circlip.

**Steel** · 11-03-2017

Originally Posted by JAZZCNC

BK is Fixed end and consists of of 2 angular contact bearings held within the housing. The photo shows all sizes depending on end machining and screw diameter. IE: Bk12 being used for 16mm screws Bk15 20mm etc.

BF is the floating end and just uses normal bearing which floats within the housing and is held onto the ballscrew with a Circlip.

That's just what i thought until i took the BF12 apart and found 2x 6001z bearings !!!

**JAZZCNC** · 11-03-2017

Originally Posted by Steel

That's just what i thought until i took the BF12 apart and found 2x 6001z bearings !!!

Well it's knock off then because should have 2 x AC bearings which go back to back. It used to be common on the really cheap ones that the bearings where in the wrong way around so didn't work correctly allowing slop but still used AC bearings. Never seen one with skate board bearings before.!