Thread angle

In mechanical engineering, the thread angle of a screw is the included angle between the thread flanks, measured in a plane containing the thread axis.. This is a defining factor for the shape of a screw thread. Standard values include:

Name Code Angle Profile Standards Most V-threads M 60° including DIN 13 / ISO, NPT and UTS Whitworth threads W 55°BS 84: 1956 DIN 49301 / BS British standard pipe thread G 55° DIN / BS / EN / ISO 228-1 / ISO 7-1 National Pipe Thread NPT 60° ASME B1.20.-1983 Pipe Threads, General Purpose, Inch Rd 30° Knuckle thread DIN 405 / DIN 20400 Acme thread. 29° ASME/ANSI B1.5-1988 Metric trapezoidal threads Tr 30° DIN 103 Buttress threads S 45° DIN 2781 German buttress threads S 30° DIN 513 Square threads Sq 0° (parallel) ? Panzergewinde, "steel conduit thread" Pg 80° DIN 40430 British Association (BA) thread BA 47°30'= ° BS 93:2008 Löwenherz threadLöwenherz thread 53°8'≈ ° Bodmer threadBodmer thread 50° Thury threadBrooks, Randall C. "Standard Screw Threads for Scientific Instruments. Part 1: Production Techniques and the Filière Suisse." History and Technology, vol 5, 1988, pp. 68.Thury thread 47°30'= °

References List of DIN standards

Notes

Bibliography .