Grade 5 Chromium Steel Balls
High precision balls are within 5/1,000,000″ round. These are military level specification, used for precision equipment. R-64 hardness, of the highest grade.
52100 High Carbon Chromium Alloy Races
Vacuum de-gassing process for the purest chromium alloy steel, hardened to R-62, extremely tough and very durable. Polished to a mirror finish for ABEC-5 precision and noiseless movement.
Graphite/Nylon Ball Retainers
Nylon with graphite retainers are virtually frictionless while providing constant lubrication.
The ABEC 5 Standard
To meet the ABEC-5 standard, bearing design must pass all tests, which include noise testing at high RPM, extremely close tolerances for I.D. and O.D., roundness of ball, trueness of the races and micro surface finishes of balls and races.
Dimensions (IDxODxD): 30 x 42 x 7
Bearing Internal Dimension: 30
Bearing Outer (External) Dimension: 42
Bearing Depth: 7
Bearing Depth Including Extended Inner Race:
Races & Balls Material: Grade 5 Chromium Steel Balls, 52100 High Carbon Chromium Alloy Races
Cage Material: Graphite/Nylon Ball Retainers
Seals: SRS - SILICONE DUEL LIPPED
Grease: Mobil XHP-222
ABEC Rating: 5
Used on: BB30 Bottom Brackets
If you would like to return an item you have purchased from us please contact us on 0113 256 5676 or firstname.lastname@example.org or Aire Bearings Ltd, 34 Bradford Road, Stanningley, Leeds, LS28 6DD.