High Helix angle type, suitable for mahcining rather stringly material (such as SUS) and especially soft material.
	
	 
| Code No. | Nominal Size | 𝐷 | 𝐷1 | 𝐋 | 𝑙 | 
| 𝒅 × θ | |||||
| CE21.0 | 1.0 x 60º | 6 | 2.5 | 45 | 1.5 | 
| CE21.5 | 1.5 x 60º | 8 | 4 | 50 | 2 | 
| CE22.0 | 2.0 x 60º | 10 | 4 | 55 | 3 | 
| CE22.5 | 2.5 x 60º | 12 | 6.5 | 60 | 3.5 | 
| CE23.0 | 3.0 x 60º | 14 | 8 | 65 | 4 | 
| CE24.0 | 4.0 x 60º | 18 | 10 | 76 | 5 |