What is ISO 866 – Type-A centre drills about?
ISO 866 Standard specifies the dimensions of centre drills for centre holes without protecting chamfers (Type A).
ISO 866 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.
Who is ISO 866 – Type-A centre drills for?
ISO 866 on type A centre drills is useful for:
- Drill bit manufacturers
- Quality control personnel
- Suppliers of drill bits
Why should you use ISO 866 – Type-A centre drills?
Centre drills are used to drill the initial holes for other drill bits to follow up on. Hence, the centre drills need to be strong and well designed to execute their tasks.
ISO 866 provides you with detailed dimensions for type-A centre drills that help you in the production and quality control phases. ISO 866 also provides you with designation guidelines to better utilize the guidance of the ISO 13399 series on cutting tool data representation and exchange.
Overall, the guidelines of ISO 866 help you to produce quality Type A centre drills.
What’s changed since the last update?
BS ISO 866:2016 replaces ISO 866:1975, which constitutes a minor revision with the addition of Annex B, showing the relationship between the symbols in BS ISO 866:2016 and the symbols in the ISO 13399 series.
