106:
movable jaw of a vise without having to rotate the screw by many turns. A screw profile, such as acme, where the thrust face is not perpendicular to the axis, generates a significant disengagement force on a split nut, therefore a more robust controlling mechanism would be required. Quick release vices are readily available. It is not known whether any of them are currently using buttress screws. An expired patent for a clamp using a buttress thread exists and one article describes a vise whose screw thread is disengaged by reverse rotation, which is likely to use a buttress thread, however no currently manufactured devices of that nature have been found at this time (October 2018).
169:
145:
133:
157:
121:
20:
49:
where the load is principally applied in one direction. The asymmetric thread form allows the thread to have low friction and withstand greater loads than other forms in one direction, but at the cost of higher friction and inferior load bearing in the opposite direction. They are typically easier to
66:
The buttress thread form is designed to handle axial thrust applied principally in one direction. The load-bearing thread face is perpendicular or at a slight slant (usually no greater than 7°) to the screw axis. The trailing face is slanted, often at 45°. The resulting thread form has the same low
203:
but there are two distinct threaded portions of differing diameters and profiles, the larger having a wedging profile, with a tapered sealing portion in between the larger and smaller diameters. High torque may be transmitted and longitudinal force is transmitted almost parallel to the axis. The
105:
It is obvious on inspection that a buttress thread with perpendicular face, operating in a split nut, generates minimal disengagement force when tightened in the normally loaded direction, and thus it is possible to derive quick release devices to, for example, allow rapid repositioning of the
274:
381:
168:
330:
308:
144:
132:
462:
420:
491:
441:
156:
322:
120:
199:
is a pipe thread form designed to provide a tight hydraulic seal. The thread form is similar to that of
79:
machine, unlike the difficult-to-machine square thread form. It can also compensate for nut wear using a
45:
with an asymmetric shape, having one square face and the other slanted. They are most commonly used for
376:
269:
486:
432:
218:
55:
300:
8:
75:
due to the long thread base. This thread form is also comparatively easy to machine on a
253:
68:
51:
458:
437:
416:
272:, David Eslinger, "Fatigue-resistant buttress thread", issued 1992-07-07
237:
84:
481:
452:
410:
42:
430:
Oberg, Erik; Jones, Franklin D.; Horton, Holbrook L.; Ryffel, Henry H. (2000),
76:
72:
475:
379:, M. Edward Evans, "Threaded pipe connection", issued 2005-05-17
36:
200:
95:
46:
19:
213:
185:
114:
The image gallery below shows some of the types of buttress threads.
91:
80:
238:
CN101571035B - Sawtooth thread of drill pipe joint - Google
Patents
174:
The 30°/3° German "Sägegewinde" (saw tooth) buttress thread form
90:
Buttress threads have often been used in the construction of
16:
Screw thread profile with an asymmetric square/slanted shape
99:
255:
A Manual of
Engineering Drawing for Students and Draftsmen
204:
thread is about the same strength as standard V threads.
102:, because great force is only required in one direction.
23:
Two types of buttress thread profiles used in machinery.
54:
but offer higher load capacity than equivalently sized
429:
190:
436:(26th ed.), New York: Industrial Press Inc.,
61:
473:
402:The new encyclopedia of machine shop practice
286:
284:
281:
258:. McGraw-Hill book Company, Incorporated.
454:Newnes Mechanical Engineer's Pocket Book
408:
399:
18:
450:
344:
342:
340:
150:The British 45°/7° buttress thread form
474:
251:
337:
247:
245:
138:The ANSI 45°/7° buttress thread form
252:French, Thomas Ewing (1918-01-01).
191:Buttress thread in oil field tubing
94:, particularly with the screw-type
13:
333:from the original on Apr 16, 2023.
323:"What is a quick-release feature?"
14:
503:
242:
311:from the original on 3 Apr 2024.
167:
155:
143:
131:
119:
393:
369:
162:The 45°/5° buttress thread form
62:Buttress thread characteristics
451:Timings, Roger Leslie (2005),
360:
351:
315:
293:
262:
231:
98:. They are also often used in
1:
224:
404:, Wm. H. Wise & Company.
400:Barnwell, George W. (1941),
179:
83:, much like the trapezoidal
7:
207:
126:Simple buttress thread form
10:
508:
412:Design of Machine Elements
301:"US3599960A - Screw clamp"
183:
492:Threading (manufacturing)
375:
268:
67:friction properties as a
457:(3rd ed.), Newnes,
109:
56:trapezoidal thread forms
219:Trapezoidal thread form
71:but at about twice the
409:Bhandari, V B (2007),
24:
377:US patent 6893057
357:Oberg, pp. 1819–1820.
270:US patent 5127784
195:In oil field tubing,
43:screw thread profiles
32:sawtooth thread forms
28:Buttress thread forms
22:
433:Machinery's Handbook
415:, Tata McGraw-Hill,
327:Wonkee Donkee Tools
52:square thread forms
69:square thread form
25:
464:978-0-7506-6508-7
422:978-0-07-061141-2
290:Bhandari, p. 204.
50:manufacture than
499:
487:Thread standards
468:
447:
426:
405:
387:
385:
384:
380:
373:
367:
366:Timings, p. 127.
364:
358:
355:
349:
346:
335:
334:
319:
313:
312:
297:
291:
288:
279:
278:
277:
273:
266:
260:
259:
249:
240:
235:
171:
159:
147:
135:
123:
85:Acme thread form
30:, also known as
507:
506:
502:
501:
500:
498:
497:
496:
472:
471:
465:
444:
423:
396:
391:
390:
382:
374:
370:
365:
361:
356:
352:
347:
338:
321:
320:
316:
299:
298:
294:
289:
282:
275:
267:
263:
250:
243:
236:
232:
227:
210:
197:buttress thread
193:
188:
182:
175:
172:
163:
160:
151:
148:
139:
136:
127:
124:
112:
64:
17:
12:
11:
5:
505:
495:
494:
489:
484:
470:
469:
463:
448:
442:
427:
421:
406:
395:
392:
389:
388:
368:
359:
350:
336:
314:
305:Google Patents
292:
280:
261:
241:
229:
228:
226:
223:
222:
221:
216:
209:
206:
192:
189:
184:Main article:
181:
178:
177:
176:
173:
166:
164:
161:
154:
152:
149:
142:
140:
137:
130:
128:
125:
118:
111:
108:
77:thread milling
73:shear strength
63:
60:
15:
9:
6:
4:
3:
2:
504:
493:
490:
488:
485:
483:
480:
479:
477:
466:
460:
456:
455:
449:
445:
443:0-8311-2635-3
439:
435:
434:
428:
424:
418:
414:
413:
407:
403:
398:
397:
378:
372:
363:
354:
348:Oberg, p.1817
345:
343:
341:
332:
328:
324:
318:
310:
306:
302:
296:
287:
285:
271:
265:
257:
256:
248:
246:
239:
234:
230:
220:
217:
215:
212:
211:
205:
202:
198:
187:
170:
165:
158:
153:
146:
141:
134:
129:
122:
117:
116:
115:
107:
103:
101:
97:
93:
88:
86:
82:
78:
74:
70:
59:
57:
53:
48:
44:
40:
38:
33:
29:
21:
453:
431:
411:
401:
394:Bibliography
371:
362:
353:
326:
317:
304:
295:
264:
254:
233:
196:
194:
113:
104:
89:
65:
39:thread forms
35:
31:
27:
26:
201:Acme thread
96:breechblock
37:breech-lock
476:Categories
225:References
47:leadscrews
386:Figure 6.
214:Leadscrew
186:Leadscrew
180:Mechanics
92:artillery
81:split nut
331:Archived
309:Archived
208:See also
482:Screws
461:
440:
419:
383:
276:
41:. are
110:Types
100:vises
459:ISBN
438:ISBN
417:ISBN
34:or
478::
339:^
329:.
325:.
307:.
303:.
283:^
244:^
87:.
58:.
467:.
446:.
425:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
