Page 340 - needle bearings

Appendix
NTN

Maximum draft angle value

Chart showing the relationship of drafted portion length (h) vs draft angle dimension (М)
Draft angle

М
Draft angle dimensionɹМɹmm
h
h

Draft angle h h

Unit : degree Aluminum alloy М
Material Aluminum Zinc Zinc alloy
Length of
draft portion(mm) alloy alloy

3 and less 10 6

Over 3 - 10 incl. 5 3

Over 10 - 50 incl. 3 2
Length of draft portionɹhɹNN
Over 50 - 315 incl. 2 1.5

Ex. 1. JIS B 0410, Class-B
Ordinary tolerances for sheared metal plates 2. Cutting width, straightness: JIS B 0410, Class-B
JIS B 0410 Perpendicularity: JIS B 0410, Class-A
This Standard specifies the ordinary tolerances for the
shearing width and ordinary tolerances for the Definition of the terms: The terms used in this Standard
straightness and perpendicularity (hereinafter generically are as defined in JIS B 0111 (Terminology relating to
referred to as ordinary tolerance ) of metal plates of 12mm press machines) and, in addition, defined as follows.
and less in thickness which were sheared by direct shearing (1) Cutting width: Distance from one side sheared by
machines such as gear pusher, square shear, etc. shear cutter to opposite side, as illustrated in Fig. b
The ordinary tolerance shall be indicated by either one (2) Cutting length: length of one side sheared by shear
of the following methods (1) and (2). cutter, as illustrated in Fig. l.
(1) Numerical value table for each dimensional division
(2) Applicable standard No. and tolerance class

Ordinary tolerance for shearing width Unit : mm
Classification by plate thickness
1.6 and less Over 1.6 3 incl. Over 3 6 incl. Over 6 12 incl.
Tolerance class
Cutting width division Class-A Class-B Class-A Class-B Class-A Class-B Class-A Class-B product
120 and less ʶ0.2 ʶ0.5 ʶ0.3 ʶ0.5 ʶ0.7 ʶ1.2 ʵ ʶ1.6
Over 120 - 315 incl. ʶ0.3 ʶ0.6 ʶ0.4 ʶ0.8 ʶ0.9 ʶ1.6 ʵ ʶ2.0 b
Over 315 - 1000 incl. ʶ0.5 ʶ1.0 ʶ0.5 ʶ1.2 ʶ1.6 ʶ2.0 ʵ ʶ2.5
Over 1000 - 2000 incl. ʶ0.8 ʶ1.2 ʶ0.8 ʶ1.6 ʶ2.0 ʶ3.0 ʵ ʶ3.0
Sheared side
Over 2000 - 3150 incl. ʶ1.0 ʶ1.4 ʶ1.0 ʶ1.6 ʶ2.8 ʶ3.0 ʵ ʶ3.5
Remarks: non-applicable to cutting length exceeding 3150 mm.
product

b
l

Sheared side

C-12