comparison
of tolerance classifications of various national standard
standard
tolerance
class
international
organization for standardization DIN
ISO
492
normal
class
class 6X
class
6
class
5
class
4
class
2
american
national standards institutes ANSI
ANSI
AFBMA std. 20*
ABEC-1
RBEC-1
ABEC-3
RBEC-3
ABEC-5
RBEC-5
ABEC-7
ABEC-9
deutsches
institut fur normung DIN
DIN
620
P0
P6
P5
P4
P2
japanese
industrial standard JIS
JIS
B 1514
class
0
class 6X
class
6
class
5
class
4
class
2
* ABEC
is applied for ball bearings and RBEC for roller bearings
ISO 492 and 199, DIN 620 and JIS B 1514 have the same specification
level.
The tolerance and allowance of JIS B 1514 are a little different
from those of AFBMA standards.
