Page 342 - needle bearings

Appendix
NTN

Dimension-A for draft angle
Ordinary tolerance for steel castings Unit : mm
JIS B 0412 Dimension
Dimensional divisionɹl
This Standard specifies the ordinary tolerances for the A (max) Specified length
draft A1
length and as-casted wall thickness (hereinafter referred angle l1
18 incl. 1.4 Specified wall thickness
to as "ordinary tolerance") of steel castings casted by A1 A2 draft A2
Over 18 50 incl. 2 angle
sand molds. l2
Ordinary tolerance shall be indicated by either one of Over 50 120 incl. 2.8
the following methods (1) and (2). Over 120 250 incl. 3.5 l2
(1) Numerical value table for each dimensional division Over 250 400 incl. 4.5 l1
(2) Applicable Standard No. and tolerance class
Over 400 630 incl. 5.5
Ex. JIS B0412, Medium Class
Tolerance class: The ordinary tolerance class shall be Over 630 1000 incl. 7
three classes of "Fine Class", "Medium Class" and Remarks: l means l1 and l2 in the above sketch.
A means A1, A2 in the above sketch.
"Coarse Class".

Ordinary tolerance for length Unit : mm
Ordinary tolerance for aluminum alloy castings
class
Dimensional division Fine class Medium class Coarse class
JIS B 0414
120 and less ʶ1.8 ʶ 2.8 ʶ 4.5 This Standard specifies the ordinary tolerances
Over 120 - 315 incl. ʶ2.5 ʶ 4 ʶ 6 (hereinafter referred to as ordinary tolerance ) for the
length and wall thickness of aluminum alloy castings
Over 315 - 630 incl. ʶ3.5 ʶ 5.5 ʶ 9
(hereinafter referred to as castings molded by sand
Over 630 - 1250 incl. ʶ5 ʶ 8 ʶ12
mold and mold. However, this Standard is not applied to
Over 1250 - 2500 incl. ʶ9 ʶ14 ʶ22 castings molded by precision molds using Lost Wax
Over 2500 - 5000 incl. ɹʵ ʶ20 ʶ35 Method , etc.
Over 5000 - 10000 incl. ɹʵ ɹ ʵ ʶ63 Ordinary tolerance shall be indicated by either one of
the following methods (1) and (2).
(1) Numerical value table for each dimensional division
Ordinary tolerance for wall thickness Unit : mm (2) Applicable Standard No. , classification and
tolerance class by casting mold
class Fine class Medium class Coarse class
Dimensional division Ex. JIS 0414 , Sand mold, Coarse Class
18 and less ʶ1.4 ʶ2.2 ʶ 3.5 Definition of terms: The terms used in this Standard are
as defined below.
Over 18 - 50 incl. ʶ2 ʶ3 ʶ 5
Mold split surface: Two or more splitted surfaces of
Over 50 - 120 incl. ɹʵ ʶ4.5 ʶ 7
mold for drafting a model or a castings out of a
Over 120 - 250 incl. ɹʵ ʶ5.5 ʶ 9 casting mold.
Over 250 - 400 incl. ɹʵ ʶ7 ʶ11
Over 400 - 630 incl. ɹʵ ʶ9 ʶ14
Over 630 - 1000 incl. ɹʵ ɹʵ ʶ18 Length including
mold split surface
Remarks: “Fine Class” shall be applied to minor steel castings subjected to
special accuracy. Mold split surface
Length excluding mold split surface

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