Page 338 - needle bearings

Appendix
NTN

Ordinary tolerance for wall thickness Unit : mm
Ordinary tolerance for cutting dimensions
Material Gray castings Spherical graphite castings
JIS B 0405 Class
Dimensional division Fine class Coarse class Fine class Coarse class
Ordinary tolerance is applied to cutting dimensions for
which special accuracy is not required functionally and, 10 incl. ʶ1 ʶ1.5 ʶ1.2 ʶ2
therefore, applicable tolerances are indicated in batch, Over 10 18 incl. ʶ1.5 ʶ2 ʶ1.5 ʶ2.5
without individual indication of them, in relevant Over 18 30 incl. ʶ2 ʶ3 ʶ2 ʶ3
specification, drawings, etc.
Over 30 50 incl. ʶ2 ʶ3.5 ʶ2.5 ʶ4
Ordinary tolerances shall be indicated by either one of
the following methods (1) and (2).
(1) Numerical value table for each dimensional division Dimension-A for draft angle
(2) Applicable Standard No. and tolerance class Unit : mm
Ex. Ordinary tolerance shall conform to the "Medium Dimension
Class" specified in JIS B 0405. Dimensional divisionɹl A (max) Specified length
draft A1
18 incl. 1 angle l1 Specified wall thickness
Unit : mm draft
Over 18 30 incl. 1.5 A1 A2 angle A2
Class Fine class Medium class Coarse class l2
(Class-12) (Class-14) (Class-16) Over 30 50 incl. 2
Dimensional division
Over 50 120 incl. 2.5 l2
0.5 and over 3 incl. ɹʵ
ʶ0.05 ʶ0.1 Over 120 315 incl. 3.5 l1
Over 3 6 incl. ʶ0.2
Over 315 630 incl. 6
Over 6 30 incl. ʶ0.1 ʶ0.2 ʶ0.5
Over 30 120 incl. ʶ0.15 ʶ0.3 ʶ0.8 Over 630 1000 incl. 9
Over 120 315 incl. ʶ0.2 ʶ0.5 ʶ1.2 Remarks : l means l1 and l2 in the above sketch.
A means A1, A2 in the above sketch.
Over 315 1000 incl. ʶ0.3 ʶ0.8 ʶ2
Over 1000 2000 incl. ʶ0.5 ʶ1.2 ʶ3
Reference: The numerical values given above every each of “Fine Class”,
“Medium class” and “Coarse Class” match “Fine series, Medium
series”, and Coarse series” specified in ISO 2768 Ordinary tolerances for press-formed metal parts
(Permissible Machining Variations in Dimensions without Tolerance
Idi ti ) JIS B 0408
This Standard specifies the ordinary tolerances for the
punching, bending and drawing dimensions, bending
angle of press-formed metal parts (hereinafter referred to
Ordinary tolerances for castings as "ordinary tolerance").
JIS B 0407 Ordinary tolerance is applied to the dimensions for
This Standard specifies the ordinary tolerances for the which special accuracy is not required functionally and,
as-casted length and wall thickness dimensions therefore, applicable tolerances are indicated in batch,
(hereinafter referred to as" ordinary tolerance") of gray without individual indication of them, in relevant
castings and spherical graphite specification, drawings, etc.
castings molded using sand molds (excluding precision Ordinary tolerance shall be indicated by either one of
mold and other equivalent). the following methods (1) and (2).
The ordinary tolerance shall be indicated by either one (1) Numerical value table for each dimensional division
of the following methods (1) and (2). (2) Applicable Standard No. and tolerance class
(1) Numerical value table for each dimensional division Ex. JIS B0408, Class-A
(2) Applicable Standard No. and tolerance class
Ex. JIS B 0407, Coarse class

Ordinary tolerance for length Unit : mm
Material Gray castings Spherical graphite castings
Class
Dimensional division Fine class Coarse class Fine class Coarse class
120 incl. ʶ1 ʶ 1.5 ʶ1.5 ʶ 2
Over 120 250 incl. ʶ1.5 ʶ 2 ʶ2 ʶ 2.5
Over 250 400 incl. ʶ2 ʶ 3 ʶ2.5 ʶ 3.5
Over 400 800 incl. ʶ3 ʶ 4 ʶ4 ʶ 5
Over 800 1600 incl. ʶ4 ʶ 6 ʶ5 ʶ 7
Over 1600 3150 incl. ʵ ʶ10 ʵ ʶ10

C-10