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used to cut the thread cannot have efficient rake and relief angles (because of the square form), which makes the cutting slow and difficult. Square threads also cannot carry as much load as a trapezoidal thread, because the root of the square thread is smaller. Also, there is no way to compensate
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149:. It gets its name from the square cross-section of the thread. It is the lowest friction and most efficient thread form, but it is difficult to fabricate.
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is the pitch in millimeters. When there is no suffix it is a single start thread. If there is a suffix then the value after the multiplication sign is the
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would denoted two starts, as the lead divided by the pitch is two. The "LH" denotes a left hand thread.
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The greatest advantage of square threads is that they have a much higher intrinsic efficiency than
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The greatest disadvantage is the difficulty in machining such a thread. The
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and the value in the parentheses is the pitch. For example:
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for wear on the nut, so it must be replaced when worn out.
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173:, on the nut. This also increases the nut life.
141:profile, used in high load applications such as
27:Screw thread profile with a square cross-section
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165:or metric trapezoidal). Due to the lack of a
244:is the nominal diameter in millimeters, and
62:introducing citations to additional sources
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193:Square threads are defined as follows by
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52:Relevant discussion may be found on the
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313:Standard pitches for metric diameters
299:{\displaystyle Sq\,60\times 18(P9)LH}
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129:Dimensions of a square thread form
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169:there is no radial pressure, or
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226:{\displaystyle Sq\,60\times 9}
153:Advantages & disadvantages
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240:designates a square thread,
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446:Design of Machine Elements
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178:single-point cutting tools
479:Threading (manufacturing)
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443:Bhandari, V B (2007),
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449:, Tata McGraw-Hill,
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73:"Square thread form"
58:improve this article
390:Leadscrew mechanics
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159:trapezoidal threads
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135:square thread form
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456:978-0-07-061141-2
429:Bhandari, p. 205.
417:Bhandari, p. 203.
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318:Nominal diameter
171:bursting pressure
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189:Classification
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56:. Please help
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75: –
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69:Find sources:
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18:Square thread
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437:Bibliography
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167:thread angle
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139:screw thread
137:is a common
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197:standards:
468:Categories
395:References
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147:jackscrews
143:leadscrews
84:newspapers
384:Mechanics
273:×
218:×
114:June 2021
54:talk page
321:Pitch
98:scholar
474:Screws
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358:55, 60
342:40, 44
236:where
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400:Notes
105:JSTOR
91:books
451:ISBN
250:lead
163:Acme
145:and
133:The
77:news
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369:10
195:ISO
180:or
60:by
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422:^
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242:60
238:Sq
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285:9
282:P
279:(
266:q
263:S
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221:9
211:q
208:S
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