The bearings tests are made in accordance with the ISO 2859 standard, include three levels:
AQL 0.01 ("key items"); includes the testing of hardness, cracking and bearings destignation.
AQL 1.0 ("main items"); is the second level of testing which covers dimensions testing, testing of internal clearance,,
AQL 4.0 ("sub-items"); is the last testing phase which covers magnetism testing, bearing appearance and packaging.
INSPECTION CLASSIFICATION
KEY ITEMS
MAIN ITEMS
SUB-ITEMS
HARDNESS
Δdmp, Vdp, Vdmp
ΔBs, VBs
CRACKING
ΔDmp, VDp, VDmp
ΔCs, VCs
DESIGNATION
Gr
MAGNET RESIDUE
Kia, Sia
CHAMFER
Kea, Sea
APPEARANCE
Sd, SD
ANTI-RUST PACKING
ROTATION
SURFACE ROUGHNESS
SEALING
MARKING QUALITY
NOISE AND VIBRATION OF ORDINARY BEARINGS
Each bearing is tested in order AQL 0.01 - AQL 1.0 - AQL 4.0. For the bearing to finish the testing successfully, it must satisfy all three levels of testing. In case it fails to demonstrate sufficient quality in regard to only one of the levels, the testing ends which means that the whole consignment of this type of bearings is rejected.
AQL 0.01 ("key items"); includes the testing of hardness, cracking and bearings destignation. 