The 121-85816 is a 3 5/8-16 high speed steel bottom tap for producing internal threads. It is listed as a special bottom tap in the H.S.S. machine screw and fractional tap category.
Bottom taps are typically used to finish internal threads, including threads in blind holes where a full-length threaded section is needed near the bottom of the hole.
- Model: 121-85816
- Size: 3 5/8-16
- Material: High speed steel
- Tap style: Bottom tap
