Encyclopedia
Thread angle
Angle between flanks of a screw thread
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° | 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° | 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' = 47.5° | BS 93:2008 | |
| Löwenherz thread | 53° 8' ≈ 53.1° | |||
| Bodmer thread | 50° | |||
| Thury thread | 47° 30' = 47.5° |
Sources and credits
This article is adapted from the Wikipedia article “Thread angle”, written by its contributors and licensed under CC BY-SA 4.0. Fathomly has changed the layout, removed citation markers, navigation and maintenance notices, and adjusted punctuation. This adapted version is shared under the same license. For references, see the original article.
Images, from Wikimedia Commons:
- Thread angle.svg by derivative work: Wizard191 (talk) Zavit_nazvoslovie.svg: Baran Ivo, Public domain
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