
Terminology
4
1 3
c
b d e e head Squar g width
a
1. Thread length 2. Neck diameter 3. Square head length 4. Total length
a. Core diameter b. Cutting edge thickness c. Chip pocket
d. Chamfer length e. Thread profile angle f. Pitch g. Chamfer angle
f Chamfer and thread profile
Chip space and application Chip space type
Helical flute tap
Straight flute tap
| Application Features | |
| – Helical flute | – For long-chipping materials |
| – No chips inside the hole | – Suitable for blind holes |
| – Good entering performance | – Usage in holes with groove |
| – Simple centring | |
| – Straight flute | – For hard machining |
| – Stable cutting edge | – For short-chipping materials |
| – Easy regrinding | – For through holes and blind holes |
– For wear material