3/8" BSPT Somta High Speed Steel Tap 2320950 Model # SI5500 Specifications Chuck:

Model # SI5500 Specifications Chuck: 10mm keyed

* Chrome finish

50 x M16 Zinc Plated

but for internal diameters twice the tape thickness has to be subtracted

3/8" BSPT Somta High Speed Steel Tap 2320950 Model # SI5500 Specifications Chuck:Taper thread, British Standard Pipe Taper thread (BSPT), whose diameter increases or decreases along the length of the thread. For producing precision threads by hand tapping, for starting threads either second or bottoming taps should used after to achieve desire thread depth. Taper pipe reamer recommended prior to tapping Rc (BSPT) thread forms General purpose use Threads per inch 19 Overall length 75mm Cutting length 21mm Drill diameter 14. 75mm