
TopThread Square Shank Toolholder Sizes: Cresting (Full Profi le):
External Threading ISO 1,5–3,0mm pitch 60° Partial Profi le — Flat Top
(NTF and NTK): UN 44–4.5 TPI ISO 0,6–5,5mm pitch
TopThread Boring Bar Diameters: Cresting (Full Profi le):
Internal Threading Minimum bore —11,5mm ISO 1,5–3,0mm pitch
60° Partial Profi le — Flat Top
(NT-1L, NTF, and NTK): UN 24–4.5 TPI ISO 1,0–5,5mm pitch