Our exterior sliding door hardware kits doors meets performance requirements of ANSI/BHMA 156.14 (Grade 1) for sliding doors by exceeding 100,000 cycles. The important reason is we use superior bearing.
Double NSK bearing inside one of our barn door roller. It’s a Japan famous brand.Magnetic bearing steel, hardness is 70, can be rotated more than 100,000 times. That’s the most important factor of our 5 year warranty. url:http://www.slidingdoorshardware.com