Spiralock® taps are furnished with ramp angles as shown here. This is referred to as style "BT" for bottom tapping. When tapping from the opposite end of a through hole, you must specify Spiralock style "TT" (top tapping), which has the ramp angle facing the opposite direction.
Designed for a wide variety of low-hardness materials that generate long chips. The spiral point pushes chips ahead of the tap in a through hole, while the spiral flute design provides good chip removal from a blind hole. Necked blanks allow better access for lubrication. These taps can be used for hand tapping.
- High speed steel
- TiN coating
- Replaces General Purpose taps; can be used for hand tapping
- Plug chamfer uses spiral point design
- Bottom chamfer uses a spiral flute design (sizes larger than #3 or M2.5)