Packing Quantity:

1 set= 1 pc MGN12H/C(block)+1 pc guide

If you choose single 1 MGN12C or 1 MGN12H,

the actual quantity will be 1 block (do not include the guide). 

* The guide rail and the slider are Class C, we think it is not necessary to provide additional steel balls, because the precision size of the steel ball may not match the size of the slider steel ball, such as -2μ -4μ ± 0 +2μ, which may shorten the slip The useful life of the block.

* If you need additional steel balls, we can give them away for free. Operation method: place an order and leave a message, by default, a steel ball with a tolerance of ±0 will be provided. (Polish warehouse does not participate)

The slide block preload is ZF (normal clearance)/Z0 (no preload)/Z1 (light preload)
The pre-tightening force of ZF-Z0-Z1 increases successively,
Z0/ZA is shipped randomly and the price is the same.
When the slider is vertical,
ZF can slide under the gravity of the slider.
Z0 can slide under thrust.
This is only a rough description, not rigorous, without considering factors such as lubricating oil, it can only be used as a reference. (Considering that some buyers use this as a standard for the quality of the slider)

We recommend that most 3D printers or light desktop devices use ZF/Z0 preload
Z1 is only suitable for occasions where accuracy and life are required.
We also provide nickel-plated rails/chrome-plated rails/blackened rails/44C martensitic stainless steel rails, as well as stainless steel 440C sliders/plated sliders
If you are interested in them, please contact us.