As far as I know, the description says Teflon coated. However, I have an anti-play nut made from POM. Finding these anti-backlash nuts very handy, I combined the teflon coated threaded rod and the POM nuts and to my surprise encountered a seizure as the Z-axis didn't move at all, the stepper motor couldn't overcome the mechanical resistance. Maybe they are not intended to be used in this combination? Also, the rod doesn't easily fit into the rod sleeve, but this was stated in the description. I removed the teflon coated shaft and reverted to the original steel shaft as I don't have an anti-play brass nut. Someday I'll buy a brass (they call it copper) anti-backlash nut and try again.
Iverntech MGN12 400Mm Linear Rail Guide Upgrade For Ender 3, Corexy, Tronxy, Delta Kossel 3D Printers And CNC Machines With Stainless Steel Carriage Block
12 Review
Iverntech 400Mm MGN12 Linear Rail Guide With 2 Black Stainless Steel MGN12H Carriage Blocks For CNC Parts And 3D Printer Upgrades
8 Review
Goodyear Ultra Grip Ice SUV 235/65 R17 108T winter
35 Review
Iverntech MGN12 700Mm Linear Rail Guide With MGN12H Stainless Steel Carriage Block For 3D Printer And CNC Parts
11 Review