ISO 235-2016 pdf free.Parallel shank jobber and stub series drills and Morse taper shank drills.
This document specifies the dimensions of the following three types of drills:
a) parallel shank drills, stub series;
b) parallel shank drills, jobber series;
c) Morse taper shank drills.
It comprises, for each type of drill mentioned above, three tables giving, respectively:
a) the dimensions in millimetres;
b) the dimension in inches;
c) the corresponding lengths, in millimetres and in inches, set out as functions of diameter steps.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.orgJ
— ISO Online browsing platform: available at http://www.iso.org/obp
4 Interchangeability
The numerical tables have been drawn up in such a way as to ensure that the standard dimensions in millimetres and inches correspond as closely as possible.
To this end, the complete range of diameters has been subdivided into a number of steps, the limits of which have been derived from the preferred number series for the metric values and converted directly from those for the inch values; the lengths and taper shank dimensions remain the same for the metric and the inch value within a given step.
The recommended diameters in the two systems of units of measurement differ, however, and the number of recommended diameters in a given step also differs in one system from that in the other.
Finally, the tolerance on the diameter of the cutting portion has been standardized solely on the basis of the metric value of h8, converted directly into inches for inch drills.ISO 235 pdf download.
Tags: Parallel shank jobber and stub series
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