Page 343 - needle bearings

Appendix
NTN

Ordinary tolerance for length Unit : mm
ʢRef.ʣ
Dimensional Over 50 Over 120 Over 250 Over 400 Over 800 Over 1600 Correspond to standard 1ʣ
division 50 incl. 120 incl. 250 incl. 400 incl. 800 incl. 1600 incl. 3150 incl.
Type tolerance grade
Fine
Fine
Fine
Fine
Fine
Fine
Fine
Fine
class class Coarse class Coarse class Coarse class Coarse class Coarse class Coarse class Coarse class Coarse
class
class
class
class
class
class
class
class
Portion ʶ0.5 ʶ1.1 ʶ0.7 ʶ1.2 ʶ0.9 ʶ1.4 ʶ1.1 ʶ1.8 ʶ1.6 ʶ2.5 ʵ ʶ4 ʵ ʶ7 15 16
including no
Castings by sand mold mold split
surface
Portion
including
mold split ʶ0.8 ʶ1.5 ʶ1.1 ʶ1.8 ʶ1.4 ʶ2.2 ʶ1.8 ʶ2.8 ʶ2.5 ʶ4.0 ʵ ʶ6 ʵ ʵ 16 17
surface
Portion ʶ0.3 ʶ0.5 ʶ0.45 ʶ0.7 ʶ0.55 ʶ0.9 ʶ0.7 ʶ1.1 ʶ1.0 ʶ1.6 ʵ ʵ ʵ ʵ 14 15
including no
Castings by casting mold mold split
surface
Portion
including
mold split
surface ʶ0.5 ʶ0.6 ʶ0.7 ʶ0.8 ʶ0.9 ʶ1.0 ʶ1.1 ʶ1.2 ʶ1.6 ʶ1.8 ʵ ʵ ʵ ʵ 15 15
Note 1) Conforming to Appendix-2 to JIS B 0404 (Rule for Ordinary Dimensional Tolerances)
Ordinary tolerance for wall thickness Unit : mm
Dimensional division Over 6 Over 10 Over 18 Over 30
6 incl.
10 incl. 18 incl. 30 incl. 50 incl.
Tolerance class Fine Coarse Fine Coarse Fine Coarse Fine Coarse Fine Coarse
Type Max. length of castings class class class class class class class class class class
120 incl. ʶ0.6 ʶ1.2 ʶ0.7 ʶ1.4 ʶ0.8 ʶ1.6 ʶ0.9 ʶ1.8 ʵ ʵ
Castings by Over 120 250 incl. ʶ0.7 ʶ1.3 ʶ0.8 ʶ1.5 ʶ0.9 ʶ1.7 ʶ1.0 ʶ1.9 ʶ1.2 ʶ2.3
sand mold Over 250 400 incl. ʶ0.8 ʶ1.4 ʶ0.9 ʶ1.6 ʶ1.0 ʶ1.8 ʶ1.1 ʶ2.0 ʶ1.3 ʶ2.4
Over 400 800 incl. ʶ1.0 ʶ1.6 ʶ1.1 ʶ1.8 ʶ1.2 ʶ2.0 ʶ1.3 ʶ2.2 ʶ1.5 ʶ2.6
120 incl. ʶ0.3 ʶ0.7 ʶ0.4 ʶ0.9 ʶ0.5 ʶ1.1 ʶ0.6 ʶ1.3 ʵ ʵ
Castings by
casting mold Over 120 250 incl. ʶ0.4 ʶ0.8 ʶ0.5 ʶ1.0 ʶ0.6 ʶ1.2 ʶ0.7 ʶ1.4 ʶ0.9 ʶ1.8
Over 250 400 incl. ʶ0.5 ʶ0.9 ʶ0.6 ʶ1.1 ʶ0.7 ʶ1.3 ʶ0.8 ʶ1.5 ʶ1.0 ʶ1.9
Maximum draft angle value Unit : degree
Classification by draft angle Outer Inner
Inner draft angle
Tolerance class Fine Coarse Fine Coarse
Type of castings class class class class
Outer draft angle
Fine class 1 2 2 3
Coarse class
Remarks: The numerical values in this table shall be applied to draft portions
of 400 mm and less in length.

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