Reiff & Nestor Company
Quality Taps Since 1912
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Thread Series Designations - British Screw Threads
STD. TAP & DIE MARK.
PROD. THD. DESIGNATION
THREAD SERIES
REFERENCE BRITISH STANDARD
BA
BA
British Association
BS93
BSC
BSC
British cycle
BS811
BSF
BSF
British WHITWORTH Fine
BS84
BSW
BSW
British WHITWORTH Coarse
BS84
OBSOLETE
BSPP
British Straight Pipe
OBSOLETE
OBSOLETE
BSPT
British Taper Pipe
OBLOSETE
WHIT
WHIT
British WHITWORTH Special
BS84
STD. TAP MARKING*
BRITISH PIPE THREADS
G 1/4 Rc 1/4 Rp 1/4
G Rc Rp
British Internal Straight Pipe for Mechanical Joints British Internal Taper Pipe for Pressure Tight Joints British Internal Straight Pipe for Pressure Tight Joints
BS2779 BS21 BS21