36:
271:
flanks when subjected to radial loads, which would contribute substantially to friction forces and thread wear. However, there is a
Centralizing Acme-thread standard (also specified in ASME/ANSI B1.5-1997) which caters to applications where the threads are not radially supported, where the roots and crests of opposing threads are designed to come into contact before the flanks do under radial loads. This adds the requirement that the sum of the allowances (clearances) and tolerances on the
93:
240:
699:
104:
270:
The line of
General Purpose (GP) Acme threads (ASME/ANSI B1.5-1997) are not designed to sustain external radial loads and both the nut and bolt are, ideally, independently supported (the nut by a linear guide and the screw by shaft bearings). This is due to the need to avoid "wedging" of the thread
285:
When created before 1895, Acme screw threads were intended to replace square threads and a variety of threads of other forms used chiefly for the purpose of traversing on machines, tools, etc. Acme screw threads are now extensively used for a variety of purposes. Long-length Acme threads are used
331:
The net effect is that the minimum thread heights are greater than "basic" for internal and external GP threads and for external
Centralizing threads, and the maximum height for internal Centralizing Acme threads is shorter than "basic". The maximum diameter (within tolerance) at the crest of the
263:) are flat. This shape is easier to machine (faster cutting, longer tool life) than a square thread. The tooth shape also has a wider base which means it is stronger (thus, the screw can carry a greater load) than a similarly sized square thread. This thread form also allows for the use of a
1017:
The name "Acme thread" was proposed by A. W. Handy (1845 October 7 (Bristol, Rhode Island) – 1915 August 27 (Malden, Massachusetts)), who was then a sales representative of the Acme
Machinery Co. of Cleveland, Ohio, which made various machine tools. See: (Editorial staff) (3 January 1895)
286:
for controlled movements on machine tools, testing machines, jacks, aircraft flaps, and conveyors. Short-length threads are used on valve stems, hose connectors, bonnets on pressure cylinders, steering mechanisms, and camera lens movement.
203:
or die tooth geometry that is poorly suited to cutting). It wears better than a square thread (because the wear can be compensated for) and is stronger than a comparably sized square thread. It allows smoother engagement of the
279:(PD). The drawback is that for a given amount of end play (axial clearance due solely to PD clearances), closer tolerances and a cleaner work environment are necessitated in the application of a Centralizing Acme thread.
319:
A minimum root-crest clearance of 0.01 in (0.25 mm) (diametral) between opposing threads with 10 tpi (threads-per-inch) or fewer, and 0.005 in (0.13 mm) for finer pitches. (This is also true for the
327:
A PD allowance, which makes the PD smaller than "basic" in the case of the GP and external
Centralizing Acme threads, but greater in the case of the internal Centralizing Acme thread.
289:
The thread form shown in the figure (Basic ACME thread profile) is called "basic". The actual thread heights on both the internal (nut) and external (bolt) threads differ from
282:
Compared to square threads, disadvantages of the Acme thread form are lower efficiency due to higher friction and some radial load on the nut (angular offset from square).
208:
on a lathe leadscrew than a square thread. It is one of the strongest symmetric thread profiles; however, for loads in only one direction, such as vises, the asymmetric
741:
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
1405:
1353:
Handbook of small tools: comprising threading tools, taps, dies, cutters, drills, and reamers, together with a complete treatise on screw-thread systems
1505:
718:
1467:
1225:
368:
1410:
149:
The original trapezoidal thread form, and still probably the one most commonly encountered worldwide, with a 29° thread angle, is the
1166:
130:(power screws). They offer high strength and ease of manufacture. They are typically found where large loads are required, as in a
1290:
Oberg, Erik; Jones, Franklin D.; Horton, Holbrook L.; Ryffel, Henry H. (1996), Green, Robert E.; McCauley, Christopher J. (eds.),
1498:
974:
The Acme thread was proposed by Albert Man Powell, then president of the Powell Planer Co. of
Worcester, Massachusetts. See:
340:, stated in the screw's designation. The minimum diameter (within tolerance) at the crest of the internal thread (called the
1389:
1332:
1305:
1261:
192:
1523:
324:
of the
Centralizing Acme thread, though not its major diameters, where the allowance is made less than the PD allowance.)
2081:
1573:
187:). The Acme thread was developed in 1894 as a profile well suited to power screws that has various advantages over the
108:
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1178:
1019:
992:
978:
179:
79:
57:
220:
50:
1764:
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344:) is that of the basic thread form and equals the nominal diameter minus twice the basic thread height (i.e.
96:
1430:
1543:
1453:
714:
In case of the trapezoidal thread form the angle is 30° instead of 29°. All dimensions are in millimeters.
1221:
1686:
1611:
17:
1927:
753:
would denote two starts, as the lead divided by the pitch is two. The "LH" denotes a left hand thread.
1010:
2076:
1769:
1626:
1759:
252:
139:
44:
2045:
1849:
1834:
1774:
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There is also a "Stub Acme" thread standard, identical in all respects to the one just described
1435:
969:
1879:
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61:
1082:
1978:
1839:
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1963:
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8:
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1819:
1671:
1983:
1789:
1746:
1651:
1514:
1005:
For a brief biography of Albert Man Powell (with photograph), see: Rice, Franklin P.,
742:
703:
223:
103. While metric screw threads are more prevalent worldwide than imperial threads for
188:
219:
is similar to the Acme thread form, except the thread angle is 30°. It is codified by
2020:
2015:
1553:
1385:
1364:
1338:
1328:
1311:
1301:
1278:
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1968:
1731:
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156:
146:, and self-centering threads (which are less likely to bind under lateral forces).
321:
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272:
143:
2071:
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1601:
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932:
209:
191:, which had been the form of choice until then. It is easier to cut with either
119:
1942:
1902:
1824:
1701:
1274:
Rope-driving: a treatise on the transmission of power by means of fibrous ropes
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Shigley, Joseph E.; Mischke, Charles R.; Budynas, Richard Gordon (2003),
196:
131:
1165:
2040:
2035:
1912:
1829:
1621:
1007:
The
Worcester of Eighteen Hundred and Ninety-Eight: Fifty Years a City
942:
336:) is that of the basic thread form and equals the "nominal diameter",
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1993:
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205:
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gas, a non standard "ACME" thread is specified for gas canisters.
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2010:
1932:
1864:
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1711:
1282:
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with metric Tr 30 threads (30 mm diameter, 6 mm
1897:
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1445:
199:
than the square thread is (because the latter's shape requires
698:
275:
of nut and bolt be less than the sum of the allowances on the
239:
171:
103:
1973:
1586:
869:
968:, vol. 3 (Oxford, England: Oxford University Press, 1997),
745:
and the value in the parentheses is the pitch. For example:
693:
1009:(Worcester, Massachusetts: F.S. Blanchard & Co.,1899),
1327:, vol. 1 (5th ed.), New York: Industrial Press,
1222:"Unique Fittings & Label Colors for MVAC Refrigerants"
162:
1289:
1141:
1377:
1193:
180:
165:
231:
threads predominate in the trapezoidal thread form.
964:Simpson, John and Proffitt, Michael, ed.s, "acme",
168:
159:
126:outlines. They are the most common forms used for
1411:Nominal dimension for trapezoidal thread profiles
1072:
2063:
27:Screw thread profiles with trapezoidal outlines
1204:
1202:
717:Trapezoidal threads are defined as follows by
367:Standard Acme thread pitches for diameters in
234:
1499:
1461:
1358:Co-edition, 1908, Chapman & Hall, London.
1226:United States Environmental Protection Agency
1135:
1093:
1091:
859:
737:is the nominal diameter in millimeters, and
359:for the height of the basic thread being 0.3
1513:
1199:
1056:
966:Oxford English Dictionary: Additions Series
1506:
1492:
1468:
1454:
1088:
694:Metric trapezoidal thread characteristics
80:Learn how and when to remove this message
1249:
1208:
1167:American Society of Mechanical Engineers
1153:
1097:
1050:
757:Standard trapezoidal thread pitches for
697:
238:
102:
91:
43:This article includes a list of general
1270:
1126:
1124:
1122:
1020:"A proposed new standard screw thread,"
14:
2064:
1110:
1108:
1106:
342:min. minor diameter of internal thread
334:max. major diameter of external thread
1487:
1449:
1426:Stub ACME Thread Sizes and Data Chart
1349:
1322:
1078:
1062:
876:Thread pitch for R134a gas canisters
267:, which can compensate for nut wear.
1119:
29:
1356:, New York: John Wiley & Sons.
1194:Shigley, Mischke & Budynas 2003
1171:ASME B1.5 - 1997 Acme Screw Threads
1103:
227:thread forms, the imperially sized
24:
1436:Manufacturer of trapezoidal screws
1431:ASME: Acme Screw Threads B1.5-1997
138:. Standardized variations include
49:it lacks sufficient corresponding
25:
2093:
1399:
1277:, New York: J. Wiley & Sons,
733:designates a trapezoidal thread,
251:with a thread height half of the
1475:
979:"The proposed new screw thread,"
212:profile can bear greater loads.
155:
34:
1243:
1214:
1187:
1159:
991:Powell, A.M. (24 January 1895)
977:Powell, A.M. (24 January 1895)
369:Imperial and US customary units
247:The Acme thread form has a 29°
1765:Electrical discharge machining
1554:Numerical control (NC and CNC)
1147:
1044:
955:
217:trapezoidal metric thread form
13:
1:
1384:(7th ed.), McGraw Hill,
1381:Mechanical Engineering Design
1271:Flather, John Joseph (1895),
1038:
332:external threads (called the
1325:Machine shop training course
7:
1612:List of drill and tap sizes
1323:Jones, Franklin D. (1964),
1296:(25th ed.), New York:
926:
235:Acme thread characteristics
10:
2098:
1928:Magnetic switchable device
1441:Metric Trapezoidal Threads
1369:: CS1 maint: postscript (
1253:Design of Machine Elements
99:trapezoid thread, TR-40×7.
2082:Threading (manufacturing)
2006:
1951:
1878:
1770:Electrochemical machining
1745:
1635:
1567:
1522:
1483:
1416:Trapezoidal coarse thread
1142:Machinery's Handbook 1996
1115:Trapezoidal coarse thread
860:Other trapezoidal threads
243:Basic Acme thread profile
948:
116:Trapezoidal thread forms
1850:Rotary transfer machine
1835:Photochemical machining
1775:Electron-beam machining
1737:Tool and cutter grinder
1421:Trapezoidal fine thread
1131:Trapezoidal fine thread
64:more precise citations.
1250:Bhandari, V B (2007),
711:
710:, tolerance class 7e).
244:
193:single-point threading
140:multiple-start threads
134:or the leadscrew of a
112:
100:
2046:Tools and terminology
1406:Standard Acme threads
993:"A new screw thread,"
701:
242:
120:screw thread profiles
106:
95:
1964:Machining vibrations
1870:Ultrasonic machining
1350:Oberg, Erik (1908),
1293:Machinery's Handbook
1256:, Tata McGraw-Hill,
749:Tr 60×18(P9)LH
1984:Tool and die making
1672:Cylindrical grinder
877:
762:
371:
1652:Abrasive machining
1156:, pp. 203–204
1053:, pp. 202–204
1023:American Machinist
1002:(4) : 69–71.
996:American Machinist
982:American Machinist
875:
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712:
704:thread pitch gauge
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245:
113:
101:
2059:
2058:
2002:
2001:
1391:978-0-07-252036-1
1334:978-0-8311-1039-0
1307:978-0-8311-2575-2
1263:978-0-07-061141-2
924:
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857:
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691:
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259:) and valley (or
144:left-hand threads
90:
89:
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16:(Redirected from
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2077:Thread standards
1969:Speeds and feeds
1722:Sharpening stone
1697:Grinding machine
1692:Grinding dresser
1559:Stewart platform
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1298:Industrial Press
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1228:. 7 January 2016
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1400:External links
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1735:
1733:
1730:
1728:
1727:Spark testing
1725:
1723:
1720:
1718:
1715:
1713:
1710:
1708:
1705:
1703:
1700:
1698:
1695:
1693:
1690:
1688:
1685:
1683:
1682:Flick grinder
1680:
1678:
1677:Diamond plate
1675:
1673:
1670:
1668:
1665:
1663:
1662:Bench grinder
1660:
1658:
1657:Angle grinder
1655:
1653:
1650:
1648:
1645:
1644:
1642:
1640:
1634:
1628:
1625:
1623:
1620:
1618:
1615:
1613:
1610:
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1600:
1598:
1595:
1593:
1590:
1588:
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1583:
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1579:
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1547:
1545:
1542:
1540:
1537:
1535:
1532:
1531:
1529:
1527:
1521:
1517:and computing
1516:
1509:
1504:
1502:
1497:
1495:
1490:
1489:
1486:
1482:
1478:
1471:
1466:
1464:
1459:
1457:
1452:
1451:
1448:
1442:
1439:
1437:
1434:
1432:
1429:
1427:
1424:
1422:
1419:
1417:
1414:
1412:
1409:
1407:
1404:
1403:
1393:
1387:
1383:
1382:
1376:
1372:
1366:
1359:
1355:
1354:
1348:
1344:
1340:
1336:
1330:
1326:
1321:
1317:
1313:
1309:
1303:
1299:
1295:
1294:
1288:
1284:
1280:
1276:
1275:
1269:
1265:
1259:
1255:
1254:
1248:
1247:
1227:
1223:
1217:
1211:, p. 205
1210:
1209:Bhandari 2007
1205:
1203:
1196:, p. 400
1195:
1190:
1182:
1180:0-7918-2482-9
1176:
1172:
1168:
1162:
1155:
1154:Bhandari 2007
1150:
1143:
1138:
1132:
1127:
1125:
1123:
1116:
1111:
1109:
1107:
1100:, p. 204
1099:
1098:Bhandari 2007
1094:
1092:
1084:
1080:
1075:
1068:
1064:
1059:
1052:
1051:Bhandari 2007
1047:
1043:
1028:
1024:
1021:
1016:
1012:
1008:
1004:
1001:
997:
994:
990:
987:
983:
980:
976:
975:
973:
971:
967:
963:
962:
958:
954:
944:
941:
939:
936:
934:
931:
930:
919:
908:
897:
896:
893:density (in)
890:
885:
883:diameter (in)
880:
879:
873:
871:
867:
852:
849:
848:
844:
841:
840:
836:
833:
832:
828:
825:
824:
820:
817:
816:
812:
809:
808:
804:
801:
800:
796:
793:
792:
788:
785:
784:
780:
777:
776:
770:
765:
764:
760:
754:
748:
747:
746:
744:
740:
736:
732:
725:Tr 60×9
724:
723:
722:
720:
715:
709:
705:
700:
686:
675:
672:
671:
667:
656:
641:
640:
636:
625:
595:
594:
590:
579:
563:
562:
558:
547:
526:
525:
521:
510:
499:
498:
494:
483:
472:
471:
467:
456:
445:
444:
440:
429:
418:
417:
413:
402:
391:
390:
387:density (in)
384:
379:
377:diameter (in)
374:
373:
370:
364:
362:
358:
353:
351:
348: −
347:
343:
339:
335:
326:
323:
318:
317:
316:
314:
310:
296:
287:
283:
280:
278:
274:
268:
266:
262:
258:
254:
250:
241:
232:
230:
226:
222:
218:
213:
211:
207:
202:
198:
194:
190:
189:square thread
186:
185:
176:
152:
147:
145:
141:
137:
133:
129:
125:
121:
117:
110:
105:
98:
94:
84:
81:
73:
63:
59:
53:
52:
46:
41:
32:
31:
19:
1938:Rotary table
1918:Lathe center
1805:Machine tool
1637:Grinding and
1477:Metalworking
1380:
1357:
1352:
1324:
1291:
1273:
1252:
1244:Bibliography
1230:. Retrieved
1216:
1189:
1170:
1161:
1149:
1137:
1074:
1058:
1046:
1026:
1022:
1011:pp. 150–151.
1006:
999:
995:
985:
981:
965:
957:
863:
752:
738:
734:
730:
728:
716:
713:
360:
356:
354:
349:
345:
341:
337:
333:
330:
312:
308:
294:
288:
284:
281:
269:
260:
256:
249:thread angle
246:
228:
224:
216:
214:
150:
148:
115:
114:
76:
67:
48:
2016:Fabrication
1952:Terminology
1888:Angle plate
1815:Metal lathe
1707:Jig grinder
1617:Tap and die
1526:engineering
1083:pp. 176–177
773:pitch (mm)
721:standards:
124:trapezoidal
111:Acme thread
62:introducing
18:Acme thread
2066:Categories
2036:Metallurgy
1830:Pantograph
1622:Tap wrench
1079:Jones 1964
1063:Oberg 1908
1039:References
943:Ball screw
888:pitch (in)
761:diameters
382:pitch (in)
313:clearances
309:allowances
225:triangular
128:leadscrews
70:April 2015
45:references
2031:Machining
2026:Jewellery
1994:Workpiece
1989:Tramp oil
1979:Tolerance
1810:Machining
1800:Jig borer
1785:Engraving
1760:Broaching
1747:Machining
1627:Threading
1592:Drill bit
1574:threading
1515:Machining
1316:473691581
938:Leadscrew
265:split nut
206:half nuts
2041:Smithing
1780:End mill
1687:Grinding
1647:Abrasive
1607:Drilling
1582:Die head
1569:Drilling
1365:citation
1283:06034155
1169:(1997),
927:See also
881:Nominal
766:Nominal
375:Nominal
201:tool bit
2051:Welding
2021:Forming
2011:Casting
1943:Wiggler
1933:Mandrel
1903:Fixture
1865:Turning
1860:Skiving
1820:Milling
1795:Hobbing
1717:Sanding
1712:Lapping
1639:lapping
1232:10 July
913:⁄
902:⁄
891:Thread
886:Thread
850:90, 100
771:Thread
680:⁄
661:⁄
650:⁄
630:⁄
618:⁄
604:⁄
584:⁄
573:⁄
552:⁄
541:⁄
531:⁄
515:⁄
504:⁄
488:⁄
477:⁄
461:⁄
450:⁄
434:⁄
423:⁄
407:⁄
396:⁄
385:Thread
380:Thread
305:
291:
58:improve
2072:Screws
1898:Collet
1855:Shaper
1845:Reamer
1840:Planer
1790:Facing
1755:Boring
1549:G-code
1388:
1343:661244
1341:
1331:
1314:
1304:
1281:
1260:
1177:
970:p. 10.
842:70, 80
826:48, 52
818:40, 44
810:32, 36
802:24, 28
794:14, 16
759:metric
729:where
357:except
97:Metric
47:, but
1974:Swarf
1893:Chuck
1587:Drill
1067:p. 30
961:See:
949:Notes
870:R134a
708:pitch
257:crest
253:pitch
136:lathe
122:with
1534:2.5D
1386:ISBN
1371:link
1339:OCLC
1329:ISBN
1312:OCLC
1302:ISBN
1279:LCCN
1258:ISBN
1234:2017
1175:ISBN
743:lead
311:(or
261:root
229:Acme
215:The
184:-mee
132:vise
118:are
109:male
1913:Jig
1571:and
1544:CAM
1539:CAD
920:16
853:12
845:10
719:ISO
623:, 2
564:1,
495:10
468:12
441:14
414:16
352:).
315:):
307:by
221:DIN
197:die
195:or
2068::
1367:}}
1363:{{
1337:,
1310:,
1300:,
1224:.
1201:^
1121:^
1105:^
1090:^
1081:,
1065:,
1027:18
1025:,
1000:18
998:,
986:18
984:,
915:16
837:9
834:60
829:8
821:7
813:6
805:5
797:4
789:3
786:12
781:2
778:10
735:60
731:Tr
702:A
687:2
668:3
637:4
609:,
591:5
559:6
536:,
522:8
490:10
463:12
436:14
425:16
409:16
363:.
182:AK
172:iː
142:,
107:A
1507:e
1500:t
1493:v
1469:e
1462:t
1455:v
1395:.
1373:)
1345:.
1318:.
1285:.
1267:.
1236:.
1183:.
1085:.
1069:.
911:1
904:2
900:1
739:9
682:2
678:1
673:3
663:3
659:1
652:2
648:1
645:+
643:2
632:4
628:1
620:4
616:3
613:+
611:1
606:2
602:1
599:+
597:1
586:5
582:1
575:4
571:1
568:+
566:1
554:6
550:1
543:8
539:7
533:4
529:3
517:8
513:1
506:8
502:5
486:1
479:2
475:1
459:1
452:8
448:3
432:1
421:5
405:1
398:4
394:1
361:P
350:P
346:D
338:D
302:2
299:/
295:P
175:/
169:m
166:k
163:æ
160:ˈ
157:/
153:(
83:)
77:(
72:)
68:(
54:.
20:)
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