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Buttress thread forms, also known as sawtooth thread forms [1] or breech-lock thread forms. [ 2 ] are screw thread profiles with an asymmetric shape, having one square face and the other slanted. They are most commonly used for leadscrews where the load is principally applied in one direction.
These are usually called V-threads or vee-threads because of the shape of the letter V. For 60° V-threads, the isosceles triangle is, more specifically, equilateral. For buttress threads, the triangle is scalene. The theoretical triangle is usually truncated to varying degrees (that is, the tip of the triangle is cut short).
Acme Screw Threads: Trapezoidal Thread Form: Tr 60×9 ANSI/ASME B1.9-1973 (R2017) Buttress Inch Screw Threads: Breech-Lock Thread Form: ASME B1.10M-2004 (R2014) Unified Miniature Screw Threads: V Thread Form: 0.60 UNM ANSI/ASME B1.11-1958 (R2016) Microscope Objective Thread: V Thread Form ASME B1.13M-2005 (R2015) Metric Screw Threads: M Profile ...
This is most easily described for a square or buttress thread as the thread angle is 0 and has no bearing on the calculations. The unwrapped thread forms a right angle triangle where the base is π d m {\displaystyle \pi d_{\text{m}}} long and the height is the lead (pictured to the right).
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The thread angle also has an effect on the strength of the threads; threads with a large angle have a wide root compared with their size and are stronger. Standard types of screw threads: (a) V, (b) American National, (c) British Standard, (d) Square, (e) Acme, (f) Buttress, (g) Knuckle
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Replaced with simple version of buttress thread. The original file can be found at Image:British 45-7 buttress thread.svg. 04:38, 18 December 2008: 450 × 232 (18 KB)
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related to: buttress thread shapes