Login
Login

thread angle

{{short description|Angle between flanks of a screw thread}}

File:thread angle.svg

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.{{Harvnb|Bhandari|2007|p=203}}. This is a defining factor for the shape of a screw thread. Standard values include:

{{clear}}

class="wikitable" border="1"

! Name

! Code

! Angle

! Profile

! Standards

Most V-threads (including ISO, NPT and UTS)

| M

| 60°

| 120px

| DIN 13 / ISO ? / ASME/ANSI ?

Whitworth threads

| W

| 55°

| 120px

| DIN 49301 / BS ?

British standard pipe thread

| G

| 55°

| 120px

| DIN / BS / EN / ISO 228-1 / ISO 7-1

National Pipe Thread

| NPT

| 60°

| 120px

| ASME B1.20.-1983 Pipe Threads, General Purpose, Inch

{{plainlist|

  • Knuckle thread[http://www.gewinde-normen.de/en/knuckle-thread-din-405.html Knuckle Thread DIN 405][http://www.gewinde-normen.de/en/knuckle-thread-din-20400.html Knuckle Thread DIN 20400][http://www.bornemann-gewindetechnik.de/en/products/threading-technology/knuckle-threads.html Bornemann]
  • Round thread

}}

| Rd

| 30°

| 120px[http://www.bornemann-gewindetechnik.de/dateien/pdf/en/Rundgewinde_2_ZG.PDF Knuckle thread]

| DIN 405 / DIN 20400

Acme thread{{Harvnb|Bhandari|2007|p=204}}.

|

| 29°

| 120px

| ASME/ANSI B1.5-1988{{sfnp|Machinery's Handbook|1996|pp=1716}}

Metric trapezoidal threads

| Tr

| 30°

| 120px

| DIN 103

Buttress threads

| S

| 45°

| 120px

| DIN 2781

German buttress threads

| S

| 30°

| 120px

| DIN 513

Square threads

| Sq

| 0° (parallel)

| 120px

| ?

Panzergewinde, "steel conduit thread"

| Pg

| 80°

| 120px

| DIN 40430

British Association (BA) thread

| BA

| 47°{{nnbsp}}30'{{nbsp}}= {{#expr: 47 + 30/60}}°

| 90px

| BS 93:2008

Löwenherz thread[http://www.gewinde-normen.de/en/loewenherz-thread.html Löwenherz thread]

|

| 53°{{nnbsp}}8'{{nbsp}}≈ {{#expr: 53 + 8/60 round 1}}°

|

|

Bodmer thread[http://www.gewinde-normen.de/en/bodmer-thread.html Bodmer thread]

|

| 50°

|

|

References

=Notes=

{{reflist}}

=Bibliography=

  • {{Citation | last = Bhandari | first = V B | title = Design of Machine Elements | publisher = Tata McGraw-Hill | year = 2007 | url = https://books.google.com/books?id=f5Eit2FZe_cC | isbn = 978-0-07-061141-2}}.
  • {{MachinerysHandbook25e}}

Category:Screws

Category:Metalworking terminology

Category:Threading (manufacturing)