Round die Thread Die Right Hand Coating BSF/BSW Screw Thread Die for Pitch Thread Tapping Tools Metal Threading Die (Color : BSW 5l16 18) : Amazon.co.uk: DIY & Tools
3/8 inch x 20 TPI [Medium Class] BSF - No-Go Ring Thread Gauge (JBO Johs Boss)
British Standard Whitworth (BSW) Thread Form
BSF Thread Ring Gage Set – WESTport Corp.
BSW/BSF Thread Dimensions Chart | Optimas International
BSW & BSF Threads
Sherwood Plug Tap, Straight Flute, 3/16in. x 32 BSF, High Speed Steel, BSF, Bright 0851600C | Cromwell Tools
BSW & BSF Threads
BSW / BSF / Whits Thread Gauges
TR knowledge base | Thread geometry- British Standard Fine (BSF)