Inch connecting elements explained briefly0 pages

Inch connecting elements explained briefly :
English threads
BSW ( also known as Ww)
British Standard Withworth Coarse thread
Series
English Standard Coarse threads
Example description
BSF
British Standard Fine thread Series
1/4" – 20 BSW x 1“
1/4" – 26 BSF x 1“
Thread
diameter
G
Threads per 1“
Length
English Standard Fine threads
Example description
Thread
diameter
G 1/4" - 19 threads
Cylindrical pipe thread as of DIN ISO 228 (not leakproof)
BSPP
1/4" - 19 BSPP
British Standard Pipe Parallel Thread
English cylindrical pipe thread
Also similar to the German cylindrical pipe thread G.
R
R 1/4" - 19 threads
Conical outer surface pipe threads as of DIN 2999
BSPT
1/4" - 19 BSPT
British Standard Pipe Taper Thread
English conical pipe thread. Cone 1:16
Also similar to the German conical pipe thread R.
BA
2 BA x 1"
British Association Standard Thread
English special threads with 47 ½° flank angle.
Used in instruments and clocks
They are replaced by the metric ISO threads and
the ISO miniature threads.
Threads per 1“
Length