The 121-12840 is a 7/16"-40 high speed steel plug tap, GH3, 4F. Plug taps have a 3 to 5 thread chamfer and are commonly used for threading through holes and some blind holes.
This hand tap is intended for general-purpose hand tapping operations and for starting threads in suitable prepared holes. High Speed Steel provides good wear resistance for general-purpose applications in both ferrous and nonferrous materials.
- Model: 121-12840
- Size: 7/16"-40
- Tap type: Plug tap
- Material: High Speed Steel
- Class: GH3
- Flute designation: 4F
- Thread chamfer: 3 to 5 threads
- Use: Through holes and some blind holes
- Operation: Hand tapping and starting threads
