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:Diameter5/16"Pitch18 tpiLeadingBottomingOverall Length72 mmTapping Drill6.5 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:Diameter5/16"Pitch18 tpiLeadingBottomingOverall Length72 mmTapping Drill6.5 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:Diameter5/16"Pitch18 tpiLeadingBottomingOverall Length72 mmTapping Drill6.5 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:Diameter5/16"Pitch18 tpiLeadingBottomingOverall Length72 mmTapping Drill6.5 mm
Last updated at 03/21/2026 19:55:09
Bordo 5/16" x 18 TPI Left Hand BSW Bottoming HSS Hand and Machine Tap
Delivery between 25 Mar – 1 Apr $12.61
| Diameter (inch) | 5/16 |
| Thread Form Type | BSW |
| Surface Finish | Bright |
| Drill Size (mm) | 6.5 |
| Flute Type | Straight |
Bordo 5/16" x 18 TPI Left Hand BSW Bottoming HSS Hand and Machine Tap
Delivery between 25 Mar – 1 Apr $12.61
| Diameter (inch) | 5/16 |
| Thread Form Type | BSW |
| Surface Finish | Bright |
| Drill Size (mm) | 6.5 |
| Flute Type | Straight |
