BSW Bottoming HSS Tap by Bordo Size:1/2" x 12TPI protected area

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Collet Size: 6-8m (1/4 – 3/8)

Contains genuine tung nut oil

It provides a clean and exact cut

BSW Bottoming HSS Tap by Bordo Size:1/2" x 12TPI protected areaAbout this product: HSS BSW Bottoming Hand and Machine Tap. 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.