Thread profiles

Specifications:	Used for:
ISO M og UN	All trades of mechanical industry
UNJ	Aviation and Aerospace Industries
Original Sellers og Sl	Gradually replaced by ISO
SF (Systeme Francais)	Gradually replaced by ISO
Metrisk konisk	Lubricating nipples and pipe fittings
Whitworth	Formerly one of the most common threads. Gradually replaced by ISO
BSPT	Gas, steam and water supply
BS Gascylinder	Gas cylinders and other pressure cylinders
B.A. (British Association)	Precision Engineering; electrical appliances and other electronics
BSC (CEI)	Bicycle Industry
Tr DIN 103	Mechanical Industry for rotary threads
RD DIN 405	Pipe fittings for the food industry and fire equipment
Acme	Mechanical Industry for rotary threads
Acme lav	As Acme, but especially for threads with small metal thickness and a large pitch
Savgevind 30° DIN 513	Mechanical Industry for unilateral axial stress
Engelsk Buttress	Mechanical Industry for unilateral axial stress
Amerikansk Buttress	Mechanical Industry for unilateral axial stress
NPT	Electric fittings
Dryseal	Engine Industry for waterproof pipe fittings
NPS	Non-waterproof pipe fittings
NPSL, NPSM, NPSH	Mechanical lock for pipe fittings, normally non-waterproof
API: konicitet 1:16 og 1:32 (spids)	Oil Industry
API: konicitet 1:16 (rund)	Oil Industry
API: konicitet 1:16 (V-0.038R)	Oil Industry
API BUT	Oil Industry for casing
Hughes H-90	Oil Industry
Pg	Installation pipes, electronics