The 3638551 is a Pittsburg 4-40 HSS STI fast spiral flute bottom tap with a GH1 specification for producing internal STI threads.
This type of bottom tap is typically used for forming internal threads in blind-hole tapping applications where the tap must reach toward the bottom of the hole.
- Model: 3638551
- Size: 4-40
- Material: HSS
- Thread type: STI
- Flute style: Fast spiral flute
- Tap style: Bottom tap
- Class: GH1
- Flutes: 2
- Brand: Pittsburg
