Thread angle
Encyclopedia
The thread angle of a screw
is the angle between the threads. This is a defining factor for the shape of a screw thread
. Standard values include:
Screw
A screw, or bolt, is a type of fastener characterized by a helical ridge, known as an external thread or just thread, wrapped around a cylinder. Some screw threads are designed to mate with a complementary thread, known as an internal thread, often in the form of a nut or an object that has the...
is the angle between the threads. This is a defining factor for the shape of a screw thread
Screw thread
A screw thread, often shortened to thread, is a helical structure used to convert between rotational and linear movement or force. A screw thread is a ridge wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread...
. Standard values include:
| Thread standard | Thread angle | Profile | Letter code | Standards |
|---|---|---|---|---|
| Most V-threads (including ISO ISO metric screw thread The ISO metric screw threads are the world-wide most commonly used type of general-purpose screw thread. They were one of the first international standards agreed when the International Organization for Standardization was set up in 1947.-Basic profile:... , NPT National pipe thread National Pipe Thread Tapered Thread is a U.S. standard for tapered threads used on threaded pipes and fittings. The taper rate for all NPT threads is measured by the change of diameter over distance. The angle between the taper and the center axis of the pipe is 1° 47′ 24″... and UTS Unified Thread Standard The Unified Thread Standard defines a standard thread form and series—along with allowances, tolerances, and designations—for screw threads commonly used in the United States and Canada... ) |
60° | M | DIN Deutsches Institut für Normung is the German national organization for standardization and is that country's ISO member body. DIN is a Registered German Association headquartered in Berlin... 13 / ISO International Organization for Standardization The International Organization for Standardization , widely known as ISO, is an international standard-setting body composed of representatives from various national standards organizations. Founded on February 23, 1947, the organization promulgates worldwide proprietary, industrial and commercial... ? / ASME American Society of Mechanical Engineers The American Society of Mechanical Engineers is a professional body, specifically an engineering society, focused on mechanical engineering.... /ANSI American National Standards Institute The American National Standards Institute is a private non-profit organization that oversees the development of voluntary consensus standards for products, services, processes, systems, and personnel in the United States. The organization also coordinates U.S. standards with international... ? |
|
| Whitworth threads British Standard Whitworth British Standard Whitworth is one of a number of imperial unit based screw thread standards which use the same bolt heads and nut hexagonal sizes, the others being British Standard Fine thread and British Standard Cycle... |
55° | W | DIN 49301 / BS British Standards British Standards are the standards produced by BSI Group which is incorporated under a Royal Charter... ? |
|
| Pipe thread British standard pipe thread British standard pipe thread The British Standard Pipe thread is a family of standard screw thread types that has been adopted internationally for interconnecting and sealing pipe ends by mating an external with an internal thread.-Types:... |
55° | G | DIN / BS / EN European Committee for Standardization The European Committee for Standardization or Comité Européen de Normalisation , is a non-profit organisation whose mission is to foster the European economy in global trading, the welfare of European citizens and the environment by providing an efficient infrastructure to interested parties for... / ISO 228-1 / ISO 7-1 |
|
| Knuckle thread / round thread | 30° | Rd | DIN 405 / DIN 20400 | |
| Acme thread | 29° |  |
? | ASME/ANSI B1.5-1988 |
| Metric trapezoidal threads | 30° | Tr | DIN 103 | |
| Buttress thread Buttress thread The buttress thread form, also known as the breech-lock thread form, refers to two different thread profiles. One is a type of leadscrew and the other is a type of hydraulic sealing thread form... s |
45° | S | DIN 2781 | |
| German Buttress thread Buttress thread The buttress thread form, also known as the breech-lock thread form, refers to two different thread profiles. One is a type of leadscrew and the other is a type of hydraulic sealing thread form... s |
30° | S | DIN 513 | |
| Square threads | 0° | Sq | ? | |
| Steel conduit thread aka Panzergewinde Panzergewinde The Stahlpanzerrohrgewinde standard for screw threads, more often called by the shorter name Panzergewinde , is a technical standard created in Germany and subsequently used in various countries, such as the German-speaking zone and neighboring European countries... |
80° | Pg | DIN 40430 | |
| Löwenherz thread | 53° 8' | ? | ? | ? |
| Bodmer thread | 50° | ? | ? | ? |