Thread angle

<p>In <a href="/facts/Mechanical_engineering/cbId4fye">mechanical engineering</a>, the thread angle of a <a href="/facts/Screw/Rr0k38TC">screw</a> is the included angle between the <a href="/facts/Threading_(manufacturing)/lP5J2kou">thread</a> flanks, measured in a plane containing the thread axis. This is a defining factor for the shape of a <a href="/facts/Screw_thread/dqGzDfHv">screw thread</a>. Standard values include:
</p>

<table><tbody><tr><th>Name</th><th>Code</th><th>Angle</th><th>Profile</th><th>Standards</th></tr><tr><td>Most V-threads (including <a href="/facts/ISO_metric_screw_thread/9ewufPYV">ISO</a>, <a href="/facts/National_pipe_thread/T2MHA4P0">NPT</a> and <a href="/facts/Unified_Thread_Standard/7511dVFD">UTS</a>)</td><td>M</td><td>60°</td><td></td><td><a href="/facts/Deutsches_Institut_f%C3%BCr_Normung/BGemsWax">DIN</a> 13 / <a href="/facts/International_Organization_for_Standardization/IacYR7Yg">ISO</a> ? /  <a href="/facts/American_Society_of_Mechanical_Engineers/gpM3UR6G">ASME</a>/<a href="/facts/American_National_Standards_Institute/p3d1TQCb">ANSI</a> ?</td></tr><tr><td><a href="/facts/British_Standard_Whitworth/3t0D1d8I">Whitworth threads</a></td><td>W</td><td>55°</td><td></td><td>DIN 49301 / <a href="/facts/British_Standards/BI8HMUjL">BS</a> ?</td></tr><tr><td><a href="/facts/British_standard_pipe_thread/V3Y7kbMh">British standard pipe thread</a></td><td>G</td><td>55°</td><td></td><td>DIN / BS / <a href="/facts/European_Committee_for_Standardization/BwwUrMgy">EN</a> / ISO 228-1 / ISO 7-1</td></tr><tr><td>National Pipe Thread</td><td>NPT</td><td>60°</td><td></td><td>ASME B1.20.-1983 Pipe Threads, General Purpose, Inch</td></tr><tr><td><ul><li><a href="/facts/Knuckle_thread/nDUjTWu5">Knuckle thread</a></li><li>Round thread</li></ul></td><td>Rd</td><td>30°</td><td></td><td>DIN 405 / DIN 20400</td></tr><tr><td><a href="/facts/Trapezoidal_thread_forms/CM574gx7">Acme thread</a></td><td></td><td>29°</td><td></td><td>ASME/ANSI B1.5-1988</td></tr><tr><td><a href="/facts/Trapezoidal_thread_forms/CM574gx7">Metric trapezoidal threads</a></td><td>Tr</td><td>30°</td><td></td><td>DIN 103</td></tr><tr><td><a href="/facts/Buttress_thread/4v5oNMTl">Buttress threads</a></td><td>S</td><td>45°</td><td></td><td>DIN 2781</td></tr><tr><td>German <a href="/facts/Buttress_thread/4v5oNMTl">buttress threads</a></td><td>S</td><td>30°</td><td></td><td>DIN 513</td></tr><tr><td><a href="/facts/Square_thread/mH3hDEWo">Square threads</a></td><td>Sq</td><td>0° (parallel)</td><td></td><td>?</td></tr><tr><td><a href="/facts/Panzergewinde/6tUeTxTE">Panzergewinde</a>, "steel conduit thread"</td><td>Pg</td><td>80°</td><td></td><td>DIN 40430</td></tr><tr><td><a href="/facts/British_Association_screw_threads/Y2hYuK4X">British Association (BA) thread</a></td><td>BA</td><td>47° 30' = 47.5°</td><td></td><td>BS 93:2008</td></tr><tr><td><a href="/facts/L%C3%B6wenherz_thread/ocWryqxm">Löwenherz thread</a></td><td></td><td>53° 8' ≈ 53.1°</td><td></td><td></td></tr><tr><td>Bodmer thread</td><td></td><td>50°</td><td></td><td></td></tr></tbody></table>

<h3>Notes</h3>

<h3>Bibliography</h3>
<ul><li>Bhandari, V B (2007), <a href="https://books.google.com/books?id=f5Eit2FZe_cC"><i>Design of Machine Elements</i></a>, Tata McGraw-Hill, <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-0-07-061141-2.</li>
<li>Oberg, Erik; Jones, Franklin D.; Horton, Holbrook L.; Ryffel, Henry H. (1996), Green, Robert E.; McCauley, Christopher J. (eds.), <i><a href="/facts/Machinery%27s_Handbook/pWXA7LMn">Machinery's Handbook</a></i> (25th ed.), New York: <a href="/facts/Industrial_Press/6h3Vrea1">Industrial Press</a>, <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-0-8311-2575-2, <a href="/facts/OCLC_(identifier)/Yqad8waq">OCLC</a> <a href="https://search.worldcat.org/oclc/473691581">473691581</a>.</li></ul>

Thread angle open-in-new

Thread angle