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ISO 866:2016

Centre drills for centre holes without protecting chamfers — Type A

Publication date:   Aug 10, 2016

General information

90.93 Standard confirmed   Jun 20, 2024

ISO

ISO/TC 29/SC 9 Tools with defined cutting edges, holding tools, cutting items, adaptive items and interfaces

International Standard

25.100.30   Drills, countersinks, reamers

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Scope

ISO 866:2016 specifies the dimensions of centre drills for centre holes without protecting chamfers (Type A).
It covers only metric dimensions, which are regarded as the only recommended dimensions in the future for this type of drill.
The flutes may be straight or spiral, depending on the manufacturer's discretion.
Unless otherwise indicated, these drills will be right-hand cutting.
Recommended dimensions for Type A centre holes, which can be obtained by a rational use of the centre drills listed in this International Standard, are given in Annex A.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 866:1975

NOW

PUBLISHED
ISO 866:2016
90.93 Standard confirmed
Jun 20, 2024