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Threading Application Guide
TopThread ™ Threading
TopThread
External Threading
Square Shank Toolholder Sizes:
• Metric — 10–32mm
Cresting (Full Profi le):
UN TPI of 32–7
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
Internal Threading
Boring Bar Diameters:
• Metric — 10–50mm
• Minimum bore —11,5mm
• Steel
Cresting (Full Profi le):
UN 16–8 TPI
ISO 1,5–3,0mm pitch
F2
widia.com
60° Partial Profi le — Flat Top
(NT-1L, NTF, and NTK):
UN 24–4.5 TPI
ISO 1,0–5,5mm pitch