model M6 M7 M8
materials high speed steel W6Mo5Cr4V2 (HSS 6542)
standard GB3464, 1-1994
Precision H2
| model | screw pitch mm | length mm | blade mm | shank diameter mm |
| M6 | 1 | 66 | 19 | 6.3 |
| M7 | 1 | 66 | 19 | 5.6 |
| M8 | 1.25 | 72 | 20 | 6.3 |
Usage: for machining nuts or the common internal thread ( tapping tool)