Linear bearings are used for linear motion. They can be used to build low cost and simple linear guiding systems for a wide variety of applications such as CNC and 3d printers. This linear ball bearing slides along an 20mm linear shaft. 

Specifications

• 42mm long x 32mm outer diameter x 20mm inner diameter
• Dynamic load rating C(N): 860 N
• Static load rating Co(N): 1370 N
• 5 Ball races inside
• 2 grooves with 30.5 mm outer diameter