2Pcs HGR20-300mm Linear Rail + 1PCS RM1605-350mm Ballscrew with BF12/BK12 Kit, DSG16H Nut Housing, Coupling, Slide Blocks Linear Guide Rail Ball Screw Set for DIY CNC Routers Lathes Mills

Building a 5'x5' cnc so I had a budget in mind i wanted to stick to, and these fit the cost of what I was looking to spend. I bought 2-1500mm sets, and 1- 400mm set. They are great quality! The fitment of the everything was way better than I could've imagined for being cheap. No slop at all.Shipping was quite fast as well.Only problem I had was one set didn't have the bearing blocks, however I emailed the seller and they got in touch with me within a few hours!, and got the missing parts shipped super fast. Very impressed with their customer service. Any questions I had for them were answered very promptly. If I build another CNC ever I will definitely come back to this seller

The package came very well packed, all the parts came out great. The ball screw turns smoothly and the linear bearings are nice a sturdy. Came very quickly. No problems from me

I built a 400 x 400 laser engraver/cutter. I’ve used similar parts from other manufacturers and never had an issue but I couldn’t get these to work correctly. I’m outside the return window so I won’t be returning. A few things to note. Bearings would not even roll in the track. After soaking in alcohol it only improved a little but the crud factor was pretty bad. I’ve disassembled, cleaned many of these types of bearings but these had a lot of flashing still on the plastic. The bearing size and count was inconsistent. This is the main cause of the stiffness. The longest rail was actually not bad but the shorter ones were way too hard to move even after cleaning and repacking with almost zero load. The drag was causing the stepper to work way too hard. Beware of easy bearing loss. If you intend to remove the bearing from the rail, use care reinstalling. Remove the wiper before gently sliding it on. All bearings can loose a ball but some of these just plain fell out due to different and inconsistent sized balls. The larger balls caused the race to be slightly larger, as the bearing rolled through, the smaller ones would easily just fall out. I can’t recommend them especially if you haven’t used this type of rail and bearing. The ball screws and nut were fine. The tolerance was OK with very very small backlash. For the price I was impressed with the screws and nuts.

My initial delivery had one rail that was causing the bearing blocks (tested all 4) to bind. Vendor responded immediately to my inquiry and promptly replaced the rail. Very very happy with both the support and the finished product that is now installed

would be a 5 star, but the coupler is missing from the packaging - will cost more money, also price dropped some after I had ordered. - Get less pay more?_ Suggestion : send me a 10mm to 5mm coupler to resolve this problem please.- UPDATE customer service has been great, they will offered a replacement coupling or partial refund to buy my own, quick service! Also the rails are great quality

thy work

High quality, precision parts

It is amazing how much value you get for the price. Easy to put together and use. And as straight, flat, and smooth as I could measure. I used 2 for the y-axis, 1 for the x-axis, and a shorter version for the z-axis of my homemade router table. I'm very happy with the results.