WIDIA TopThread threading systems
TopThread inserts, external holders and internal bars
Browse WIDIA TopThread NT threading inserts with NS external holders, A-NNT internal bars and listed replacement hardware. Select by exact article number, insert size and hand.
Select for the thread and operation
Check the thread profile, pitch range and selected grade against the workpiece and whether the thread is internal or external. Keep the insert designation distinct from the holder designation.
Confirm insert and holder compatibility
Use the compatible-item links on the selected product configuration. Compare the documented seat, insert size and hand; similar names or appearance do not confirm that an insert fits a holder.
Check the machine setup and service parts
Compare shank dimensions and working clearance before selecting an external holder or internal bar. Replacement clamps and screws must match the parent holder article, not just the TopThread name.
Are all TopThread inserts interchangeable?
No. Match the exact insert size, hand and seat with the selected holder and check its documented thread range.
What information helps with a quote?
Provide the required thread form and pitch, workpiece material, internal or external operation, machine interface and quantities. Include an existing holder or insert article number when replacing tooling.
