What are ABEC 7 bearings?

What does ABEC rating mean for skateboard bearings?ABEC 7: 0.0025 mm (0.000098"); ABEC 9: 0.0012 mm (0.000047"). If a bearing is to be used in high precision, high speed machinery, these tiny variations 

Levels of Precision - Choose Wisely: How Fast Your BearingsAug 24, 2015 — ABEC includes five tolerances classes: 1, 3, 5, 7, and 9 with 1 being the widest and 9 the tightest. Thus, bearings with a higher ABEC rating Do ABEC Ratings Matter for Roller Skate Bearings?Jun 16, 2018 — You will see roller skate bearings marketed with all kinds of ABEC ratings: ABEC-1, ABEC-3, ABEC-5, ABEC-7, ABEC-9 and even ABEC-11

ABEC scale - WikipediaAs you can see, an ABEC 7 bearing only has a 5 μm (Greek letter Mu) tolerance window, whereas an ABEC 1 has double that at 10 μm. Please see the tables and 

What an ABEC Rating Tells You About Skateboard BearingsJul 22, 2018 — ABEC 7 bearings would be very fast and smooth, but very expensive. Plus, you start to run the risk of needlessly damaging them if you skate hard ABEC 7 Inline Skate Skateboard and Scooter Bearings 8-PackABEC 7 Inline Skate Skateboard and Scooter Bearings 8-Pack replacing bearings on inline skates, skateboards or scooters, for advanced users. 49 {4}

Precision ABEC 5 and ABEC 7 bearings | SKFPrecision ball bearings in tolerance grades ABEC-5 and ABEC-7 are recommended for applications where high speed and/or extreme running accuracy is The ABEC Myth | Transworld SKATEboardingJul 13, 2002 — Bearings are often misunderstood. Heplar describes the difference between an ABEC 3 and an ABEC 7 bearing as subtle, and doesn't 

Bullseye Bearings ABEC 7 Skateboard The Bullseye ABEC 7 Bearing. Bearings are circular pieces of steel with flat sides that contain eight lubricated balls, their purpose is to keep wheels running Abec vs. Skate Rated™ - Support - Bones BearingsThe ABEC rating system includes grades 1,3,5,7, and 9. The higher the ABEC rating, the tighter the tolerances are, making the bearing a more precision part. High