Bordo BSW Intermediate Tap and Drill Set 1/8 - 1/2" HSS, 14pcs

Product Features

• 1/8-1/2" HSS BSW Hand and Machine Tap Set with HSS Tapping Drills.
• British Standard Whitworth has a thread angle of 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.
• 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.

Specifications

• 1/8-1/2" HSS BSW Hand and Machine Tap Set with HSS Tapping Drills.
• British Standard Whitworth has a thread angle of 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.
• Manufactured from HSS this general purpose tap is designed for use in medium tensile materials and is for hand or general machine use.