- BSW - British Standard Whitworth
- These Left Hand taps have an angle of thread is 55 degrees as opposed to 60 degrees in Metric and Unified threads.
- This thread form was developed by Sir Joseph Whitworth in 1841.
- The thread form has rounded roots and crests and is specified in BS84:1956.
- BOTTOMING TAPS have a lead of two threads and are used to ensure minimum thread run-out when tapping to the bottom of a blind hole.
- Bottoming Taps are typically preceded by the use of a Taper or Intermediate Tap.
- INTERMEDIATE TAPS have a lead of four threads and are used in most general purpose applications to cut a thread true to a pre-drilled pilot hole.
- TAPER TAPS have a lead of eight threads and are used as a starting tap in difficult or high precision holes.
- Manufactured from HSS this general purpose tap is designed for use in medium tensile materials and is for hand or general machine use.
|Overall Length||72 mm|
|Tapping Drill||6.5 mm|