BS ISO 10898:2016 pdf download.Spot drills
1 Scope
This International Standard specifies the dimensions and technical specifications of spot drills of high-speed steel and hardmetal with a point angle of 90° or 120°.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 286-2, Geometrical product specifications (GPS) — ISO code system for tolerances on linear sizes —Part 2: Tables of standard tolerance classes and limit deviations for holes and shafts
3 Dimensions
See Figure 1 and Table 1.
4 Technical specifications
4.1 Conception
Spot drills in accordance with this International Standard shall be made without lands and back taper.
4.2 Permissible division deviation on flutes
See Table 2.
4.3 Maximum runout of the fluted part with respect to the shank
See Table 2.
5 Designation
Spot drills in accordance with this International Standard shall be designated by the following:
a) “Spot drill”;
b) a reference to this International Standard;
c) its point angle;
d) its diameter, d, in millimetres.
EXAMPLE A spot drill of diameter d = 10 mm and point angle 90° is designated as follows:Spot drill ISO 10898 – 90° – 10
BS ISO 10898:2016 pdf download
