Features: 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. ; Manufactured from HSS this general purpose tap is designed for use in medium tensile materials and is for hand or general machine use. ; Specifications:Diameter1/2"Pitch12 tpiLeadingBottomingOverall Length89 mmTapping Drill10.5 mm
Features: 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. ; Manufactured from HSS this general purpose tap is designed for use in medium tensile materials and is for hand or general machine use. ; Specifications:Diameter1/2"Pitch12 tpiLeadingBottomingOverall Length89 mmTapping Drill10.5 mm
Features: 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. ; Manufactured from HSS this general purpose tap is designed for use in medium tensile materials and is for hand or general machine use. ; Specifications:Diameter1/2"Pitch12 tpiLeadingBottomingOverall Length89 mmTapping Drill10.5 mm
Features: 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. ; Manufactured from HSS this general purpose tap is designed for use in medium tensile materials and is for hand or general machine use. ; Specifications:Diameter1/2"Pitch12 tpiLeadingBottomingOverall Length89 mmTapping Drill10.5 mm
Last updated at 04/15/2026 07:18:27
Bordo - 1/2" x 12 Left Hand BSW Bottoming HSS Tap | 3086-1/2B
Delivery between 16–24 Apr $7.95
| Diameter (inch) | 1/2 |
| Thread Form Type | BSW |
| Surface Finish | Bright |
| Drill Size (mm) | 10.5 |
| Flute Type | Straight |
Bordo - 1/2" x 12 Left Hand BSW Bottoming HSS Tap | 3086-1/2B
Delivery between 16–24 Apr $7.95
| Diameter (inch) | 1/2 |
| Thread Form Type | BSW |
| Surface Finish | Bright |
| Drill Size (mm) | 10.5 |
| Flute Type | Straight |
