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NBN ISO 2540:2021
Centre drills for centre holes with protecting chamfer — Type B
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Summary
This International Standard specifies the dimensions of centre drills for centre holes with protecting
chamfer — Type B.
It covers only metric dimensions, regarded as the only recommended dimensions in the future for this
type of drills.
The flutes can be straight or spiral at the option of manufacturer.
Unless otherwise stated, these drills are right-hand cutting.
Annex A gives the recommended dimensions for the centre holes, Type B, which can be obtained by a
rational use of the centre drills listed in this International Standard.
chamfer — Type B.
It covers only metric dimensions, regarded as the only recommended dimensions in the future for this
type of drills.
The flutes can be straight or spiral at the option of manufacturer.
Unless otherwise stated, these drills are right-hand cutting.
Annex A gives the recommended dimensions for the centre holes, Type B, which can be obtained by a
rational use of the centre drills listed in this International Standard.
Technical characteristics
| Publisher | Bureau de Normalisation Belge (NBN) |
| Publication Date | 06/07/2021 |
| Page Count | 16 |
| EAN | --- |
| ISBN | --- |
| Weight (in grams) | --- |
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07/06/2021
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