Needle Roller Bearings - Ntn-snr.com

Appendix
NTN
Ordinary tolerance for length
Type
Castings by
sand mold
Castings by
casting mold
Dimensional
division
class
Portion
including no
mold split
surface
Portion
including
mold split
surface
Portion
including no
mold split
surface
Portion
including
mold split
surface
Fine
class
0.5
0.8
0.3
0.5
50 incl.
Coarse
class
1.1
1.5
0.5
0.6
Over 50
120 incl.
Fine
class
0.7
1.1
0.45
0.7
Coarse
class
1.2
1.8
0.7
0.8
Over 120
250 incl.
Fine
class
0.9
1.4
0.55
0.9
Coarse
class
1.4
2.2
0.9
1.0
Over 250
400 incl.
Fine
class
1.1
1.8
0.7
1.1
Coarse
class
1.8
2.8
1.1
1.2
Note 1) Conforming to Appendix-2 to JIS B 0404 (Rule for Ordinary Dimensional Tolerances)
Over 400
800 incl.
Fine
class
1.6
2.5
1.0
1.6
Coarse
class
2.5
4.0
1.6
1.8
Over 800
1600 incl.
Fine
class
Coarse
class
4
6
Over 1600
3150 incl.
Fine
class
Coarse
class
7
Unit : mm
Ref. 1
Correspond to standard
tolerance grade
Fine Coarse
class class
15
16
14
15
16
17
15
15
Ordinary tolerance for wall thickness
Dimensional division
Type
Castings by
sand mold
Tolerance class
Max. length of castings
120 incl.
Over 120 250 incl.
Over 250 400 incl.
Over 400 800 incl.
Fine
class
0.6
0.7
0.8
1.0
6 incl.
Coarse
class
1.2
1.3
1.4
1.6
Fine
class
0.7
0.8
0.9
1.1
Over 6
10 incl.
Coarse
class
1.4
1.5
1.6
1.8
Fine
class
0.8
0.9
1.0
1.2
Over 10
18 incl.
Coarse
class
1.6
1.7
1.8
2.0
Fine
class
0.9
1.0
1.1
1.3
Over 18
30 incl.
Coarse
class
1.8
1.9
2.0
2.2
Fine
class
1.2
1.3
1.5
Over 30
50 incl.
Unit : mm
Coarse
class
2.3
2.4
2.6
Castings by
casting mold
120 incl.
Over 120 250 incl.
Over 250 400 incl.
0.3
0.4
0.5
0.7
0.8
0.9
0.4
0.5
0.6
0.9
1.0
1.1
0.5
0.6
0.7
1.1
1.2
1.3
0.6
0.7
0.8
1.3
1.4
1.5
0.9
1.0
1.8
1.9
Maximum draft angle value
Unit : degree
Classification by draft angle Outer Inner
Tolerance class Fine Coarse Fine Coarse
Type of castings class class class class
Fine class
Coarse class
1 2 2 3
Remarks: The numerical values in this table shall be applied to draft portions
of 400 mm and less in length.
Outer draft angle
Inner draft angle
C-15