NPT Full-Profile Threading Inserts – External & Internal
These NPT full-profile threading inserts are designed for American Standard Taper Pipe thread turning applications on CNC and conventional lathes.
The range includes both external 16ER and internal 16IR insert styles.
Available thread pitches are 8, 11.5, 14, 18 and 27 TPI.
Key Features
- NPT full-profile threading geometry
- Suitable for American Standard Taper Pipe thread applications
- External 16ER and internal 16IR styles
- Available in 8, 11.5, 14, 18 and 27 TPI
- Suitable for CNC and conventional lathes
- Designed for compatible indexable threading toolholders
Available Models
| Model | Application | TPI | Insert Size |
|---|---|---|---|
| Z16ER8NPT | External | 8 | 16ER |
| Z16ER11.5NPT | External | 11.5 | 16ER |
| Z16ER14NPT | External | 14 | 16ER |
| Z16ER18NPT | External | 18 | 16ER |
| Z16ER27NPT | External | 27 | 16ER |
| Z16IR8NPT | Internal | 8 | 16IR |
| Z16IR11.5NPT | Internal | 11.5 | 16IR |
| Z16IR14NPT | Internal | 14 | 16IR |
| Z16IR18NPT | Internal | 18 | 16IR |
| Z16IR27NPT | Internal | 27 | 16IR |
External vs Internal
- 16ER – external NPT threading
- 16IR – internal NPT threading
Thread Pitch Selection
Select the insert according to the required NPT thread pitch:
- 8 TPI
- 11.5 TPI
- 14 TPI
- 18 TPI
- 27 TPI
For full-profile threading inserts, the selected insert pitch should match the required finished thread.
Compatible Tooling
- 16ER inserts → compatible external threading holders
- 16IR inserts → compatible internal threading bars
Typical Applications
- NPT external pipe threads
- NPT internal pipe threads
- Hydraulic components
- Pneumatic components
- Pipe fittings
- General engineering
- Maintenance and repair machining
Standard
Designed for NPT thread applications based on ASME B1.20.1.
Purchasing Information
Select the required insert model from the variation dropdown above.
If you are unsure which insert is required, provide the thread standard, TPI, external or internal application, workpiece material and toolholder details.
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