Machining > Threading > Taps > Imperial - Hand Taps | Bordo BSW Taper Chrome Alloy Hand Tap | Bordo BSW Taper Chrome Alloy Hand Tap | Chrome Alloy BSW Taper Hand Tap. | Used as thread chasers to clean an existing thread. | They can also be used to create a new female thread in non-ferrous metals and plastics. | Chrome alloy taps are not suitable for creating precision, safety or critical threads. | 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. | The major diameter of external thread and pitch are specified by a simple numerical value (most commonly measured in millimetres). | Taper Taps have a lead of eight threads and are used as a starting tap in difficult or high precision holes. | About Taper Taps | Taper Taps have a lead of eight threads and are used as a starting tap in difficult or high precision holes. | Manufactured from chrome alloy this general purpose tap is designed for use in medium tensile materials and is for hand or general machine use. | About BSW (British Standard Whitworth) | 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. | The thread angle for BSW is 55 as opposed to 60 in Metric and Unified threads.