Needle Roller Bearings - Ntn-snr.com

Appendix
NTN
Ordinary tolerance for cutting dimensions
JIS B 0405
Ordinary tolerance is applied to cutting dimensions for
which special accuracy is not required functionally and,
therefore, applicable tolerances are indicated in batch,
without individual indication of them, in relevant
specification, drawings, etc.
Ordinary tolerances shall be indicated by either one of
the following methods (1) and (2).
(1) Numerical value table for each dimensional division
(2) Applicable Standard No. and tolerance class
Ex. Ordinary tolerance shall conform to the "Medium
Class" specified in JIS B 0405.
Dimensional division
0.5 and over 3 incl.
Over 3 6 incl.
Over 6
Over 30
Over 120
Class
30 incl.
120 incl.
315 incl.
Over 315 1000 incl.
Over 1000 2000 incl.
Fine class
(Class-12)
0.05
0.1
0.15
0.2
0.3
0.5
Medium class
(Class-14)
0.1
0.2
0.3
0.5
0.8
1.2
Unit : mm
Coarse class
(Class-16)
0.2
0.5
0.8
1.2
2
3
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
(Permissible Machining Variations in Dimensions without Tolerance
I di ti )
Ordinary tolerances for castings
JIS B 0407
This Standard specifies the ordinary tolerances for the
as-casted length and wall thickness dimensions
(hereinafter referred to as" ordinary tolerance") of gray
castings and spherical graphite
castings molded using sand molds (excluding precision
mold and other equivalent).
The ordinary tolerance shall be indicated by either one
of the following methods (1) and (2).
(1) Numerical value table for each dimensional division
(2) Applicable Standard No. and tolerance class
Ex. JIS B 0407, Coarse class
Ordinary tolerance for wall thickness
Unit : mm
Material Gray castings Spherical graphite castings
Dimensional division
Class
Fine class Coarse class Fine class Coarse class
10 incl.
Over 10 18 incl.
Over 18 30 incl.
Over 30 50 incl.
Dimension-A for draft angle
Dimensional divisionl
18 incl.
Over 18 30 incl.
Over 30 50 incl.
Over 50 120 incl.
Over 120 315 incl.
Over 315 630 incl.
Over 630 1000 incl.
1
1.5
2
2
Unit : mm
Dimension
A (max)
1
1.5
2
2.5
3.5
6
9
Remarks : l means l1 and l2 in the above sketch.
A means A1, A2 in the above sketch.
1.5
2
3
3.5
draft A1
angle l1
l1
A1
1.2
1.5
2
2.5
2
2.5
3
4
Specified length
Specified wall thickness
A2 draft A2
angle l2
Ordinary tolerances for press-formed metal parts
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
as "ordinary tolerance").
Ordinary tolerance is applied to the dimensions for
which special accuracy is not required functionally and,
therefore, applicable tolerances are indicated in batch,
without individual indication of them, in relevant
specification, drawings, etc.
Ordinary tolerance shall be indicated by either one of
the following methods (1) and (2).
(1) Numerical value table for each dimensional division
(2) Applicable Standard No. and tolerance class
Ex. JIS B0408, Class-A
l2
Ordinary tolerance for length
Unit : mm
Material Gray castings Spherical graphite castings
Dimensional division
Class
Fine class Coarse class Fine class Coarse class
120 incl.
Over 120 250 incl.
Over 250 400 incl.
Over 400 800 incl.
Over 800 1600 incl.
Over 1600 3150 incl.
1
1.5
2
3
4
1.5
2
3
4
6
10
1.5
2
2.5
4
5
2
2.5
3.5
5
7
10
C-10