Best Linear Ball Bearings

We don't Offer International Shipping. Chrome Plated 60 Inch Length 40 mm Diameter Shaft.
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Made in Germany High Quality RJ4JP-01-08 Sold polymer Linear bearings are great replacements for LM8UU linear bearings - quiet and effective, very low friction.
Reviews
Find Best Price at Amazon"These do have a tad more play than the roller bearings they are replacing, but I think they will work great!"

12pcs LM8UU,12Pcs LM8UU Linear Bearings for 3D Printer(8mm x 15mm x 24mm),Great for linear motion on 3D Printer, CNC, and other applications.
Reviews
Find Best Price at Amazon"upgraded and installed thses on my wanhoa i3 y carriage, quieted the 3d printer down and the carriage moves so much smoother."
"Used to replace all the bearings on my FT 2020 i3, they roll smooth and quieted my printer a lot compared to the beat up stock bearings."
"Great replacement part for 3d printers, made out of high quality steel and ball bearing."
"A good set of bearings for the price."
"So far so good, the roll nice."
"These bearings were exactly what I needed."
"Typical cheap bearings."
Best Linear Roller Bearings

The model, T125XY-50R, XY Linear Translation Stage, features crossed-roller bearing guide for precise linear motion and stable performance over the entire 50 mm travel range.
Reviews
Find Best Price at Amazon"As I said for the Z-stage, this product is perfect, accurate and precise, well made."
Best Track Runner Bearings

This McGill CF Camrol series steel stud-type cam follower bearing with lip seals and a hexagonal hole supports high static and dynamic loads in cam- and track-type applications. Track runner bearings, also called track roller bearings, are rolling element bearings with a thick-walled outer ring that rotates directly on cam and track surfaces. Stud-type track rollers, such as cam followers, have a built-in threaded rod, instead of an inner ring, for either threaded mounting or through-hole mounting onto machine components. Available in a variety of materials and mounting configurations, track runner bearings are used in a broad range of cam-controlled and linear motion applications including agricultural machinery, conveying equipment, cam drives, material handling equipment, robotics, and automotive equipment, among others.
Reviews
Find Best Price at Amazon"GREAT PRODUCT - GREAT SELLER - NO COMPLAINTS."