1、UDC 621.882.082.5 : 621.753.1 DEUTSCHE NORM April 198 Major diameter of internal thread Major diameter of external thread Minor diameter of internal thread Minor diameter of external thread Pitch diameter of internal thread Pitch diameter of external thread Metric buttress threads Deviations and tol
2、erances H10“) 9 h 9“) 4 7 8 9 7 8 9 7 8 9 DIN 51 3 Part 3 Metrisches Sgengewinde; Abmae und Toleranzen Supersedes January 1975 edition. In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used throughout as the decimal
3、 marker. Contents Page Page 1 Introduction . 1 6 Major and minor diameter tolerances 3 2 Designations . 1 7 Pitch diameter tolerances 5 3 Tolerance grades 1 8 Recommended tolerance zones 6 4 Tolerance positions (fundamental deviations). . 2 9 Formulae 6 5 Lengths of thread engagement . 3 10 Multiple
4、-start buttress threads . 7 1 Introduction The same tolerance system is used for single-start metric buttress threads as for IS0 metric screw threads. Thus, this standard includes extracts from DIN 13 Part 15 for threads up to 8 mm pitch and values supplemented by fundamen- tal deviations AO, by len
5、gths of thread engagement and by tolerances for threads with pitches greater than 8 mm. The tolerance zones recommended for buttress threads are different from those for screw threads, whilst the tolerance grades 1) specified for the pitch diameter are identical with those specified for metric trape
6、zoidal screw threads. As the buttress thread is supposed to be centred round the major diameter, the circular fit H10/h9 has been specified for it. 2 Designations The complete designation of a screw thread includes information on the thread system, the nominal size of the thread and a symbol for thg
7、 thread tolerance. The designation for the metric buttress thread is given in DIN 513 Part 2. The symbol for the metric buttress thread tolerance refers only to the pitch diameter tolerance as only one tolerance is fixed for the minor diameter of the internal thread and one for the major diameter of
8、 the internal and external threads. Each symbol for the thread tolerance consists of a number indicating the tolerance grade, a letter giving the tolerance position, with an upper case letter for the internal thread and a lower case letter for the external thread. Example of designation for an inter
9、nal thread: S 40 x 7 - 7H Example of designation for an external thread S 40 x 7 - 7 e A fit is indicated by the symbol for the internal thread tolerance followed by the symbol for the external thread tolerance, both separated by an oblique stroke. Example: S 40 x 7 - 7 H/7e 3 Tolerance grades Table
10、 1. Tolerance grades for major, pitch and minor diameters Diameters Tolerance grades 1) Previously referred to as “tolerance quality“. This term does not comply with the definition of the concept “quality“ asestablished in DIN 55350 Part 11, however. Continued on pages 2 to 8 DIN 513 Part 3 Engl. Pr
11、ice group 8 Sales No. 0108 Beuth Verlag GrnbH, Berlin 30. has exclusive sale rights for German Standards (DIN-Normen) 01.86 Page 2 DIN 513 Part 3 external Pitch P mrn 2 3 4 5 6 7 8 9 10 12 14 16 18 20 22 24 28 32 36 40 44 4 Tolerance positions (fundamental deviations) The following tolerance positio
12、ns shall apply for external and internal threads: external thread: c for the pitch diameter tolerance and h in all cases for the major and minor diameter tolerances, .e. the fundamental deviation for these two diameters is always O; internal thread: the fundamental deviation for the major, pitch and
13、 minor diameters is always O, .e. only tolerance position H is applicable. Figure 1. Internal thread with tolerance position H thread AO Tolerance posit ion C e Clm Pm -150 - 71 -170 - a5 -190 - 95 -212 -1 06 -236 -1 18 -250 -125 -265 -1 32 -280 -140 -300 -1 50 -335 -1 70 -355 -1 80 -375 -190 -400 -
14、200 -425 -212 -450 -224 -475 -236 -500 -250 -530 -265 -560 -280 -600 -300 -630 -315 DIN 513 Part 3 Page 3 mm 18 20 22 24 28 32 36 40 44 6 Major and minor diameter tolerances 6.1 Table 4. Minor diameter tolerances TD, for internal threads Clm 1120 1180 1250 1320 1500 1600 1800 1900 2000 5 Lengths of
15、thread engagement The lengths of thread engagement are divided into groups N (normal) and L (long) N From Upto 6 19 10 28 8 24 11 32 15 43 18 53 30 85 12 36 21 63 25 75 30 85 34 100 42 125 50 150 15 45 19 56 38 118 L Over 19 28 24 32 43 53 85 36 63 75 85 100 125 150 45 56 118 Over 6 10 18 30 50 80 1
16、20 180 250 315 400 500 up to 10 18 30 50 80 120 180 250 31 5 400 500 630 Nominal thread diameter rnrn Over up to 6 10 10 18 18 30 30 50 50 80 80 120 d h9 Clm 36 43 52 62 74 87 Table 3. Dimensions in mm Pitch P Nominal thread diameter d up to Over 5,6 2 3 2 3 4 5 8 3 5 6 11,2 22.4 1 1,2 6.2 Major dia
17、meter tolerances TD for internal threads 22.4 45 45 90 7 8 10 12 3 4 8 TD H10 Pm 58 70 84 1 O0 120 140 160 185 210 . 230 250 2 80 9 10 12 67 200 200 75 236 236 85 1 265 I 265 14 16 18 4 6 8 12 14 16 18 20 22 24 28 71 71 106 106 132 132 200 200 90 180 6.3 Major diameter tolerances Td for external thr
18、eads Table 6. 118 132 150 50 150 150 75 224 224 112 1 335 I 335 8 12 18 20 22 24 32 36 40 44 125 375 375 140 425 425 150 1 450 1 450 180 355 640 200 600 600 224 670 670 250 750 750 280 850 850 12 18 24 44 - 355 Page 4 DIN 513 Part 3 6.4 Minor diameter tolerances Sd3 for external threads Td3 Pitch at
19、 tolerance position c of the pitch diameter P Tolerance grade Td3 at tolerance position e of the pitch diameter Tolerance grade 7 8 9 Prn Ilrn Ilrn 388 445 525 435 50 1 589 4 O0 462 544 450 520 614 52 1 609 690 562 656 775 709 828 965 482 564 670 587 68 1 806 655 767 899 6 94 813 9 50 7 34 859 1015
20、800 925 1087 866 998 1223 7 8 Ilm Prn 309 366 3 50 416 32 1 383 365 435 426 514 456 550 576 695 397 479 481 575 537 649 569 688 60 1 726 650 775 69 1 823 1363 1450 1538 1625 1613 1700 1800 1900 8 12 18 20 22 24 32 36 40 44 12 18 24 44 828 965 1153 695 832 998 1173 1398 823 998 1187 1400 1650 987 120
21、0 1263 1488 1750 1050 1275 1288 1513 1775 1062 1287 1363 1600 1875 1124 1361 1530 1780 2092 1265 1515 1623 1885 2210 1343 1605 1663 1925 2250 1363 1625 1755 2030 2 380 1440 1715 1035 1223 1460 870 1058 1238 1462 1725 1038 1263 1363 1600 1875 1124 1361 1818 2155 2 530 1503 1840 9 um mrn 2 3 446 504 4
22、65 529 595 669 832 585 700 78 1 3 5 6 825 882 937 1048 7 8 10 12 50 1 565 7 65 616 689 919 3 4 8 9 70 12 1052 1118 963 1138 1085 1273 81 1 831 929 67 1 68 1 754 803 81 3 91 o 978 988 1098 i 12 1180 1253 1320 720 868 970 1160 1243 1315 1388 1355 1438 1525 815 98E 1103 1335 967 1028 1088 595 712 795 9
23、47 1142 1213 1288 690 830 928 1122 805 853 900 489 587 663 785 970 1038 1100 584 705 7 96 9 60 14 1018 1193 1418 1500 1 1 1 1588 16 18 843 890 9 50 1018 1078 1138 20 22 24 28 1175 1232 1313 1388 962 1011 1074 1138 1150 1224 1299 1375 1400 1474 1561 1650 1020 1223 1450 1537 1549 1636 1827 1930 1950 2
24、065 1295 1525 1636 2215 DIN 513 Part 3 Page 5 Pitch P 7.2 Pitch diameter tolerances Td2 for external threads Td2 Tolerance grade 7 Pitch diameter tolerances 7.1 Pitch diameter tolerances TD Table 8. for internai threads Pitch P Table 9. TD2 Tolerance grade Vominal thread diameter d mm 2 3 2 3 4 5 8
25、3 5 6 7 8 10 12 3 4 8 9 10 12 14 16 18 4 6 8 12 14 16 18 20 22 24 28 8 12 18 20 22 24 32 36 40 44 12 18 24 44 Nominal thread diameter d 6 pm 150 170 160 180 212 224 280 200 236 265 280 300 315 335 212 236 315 335 335 375 400 425 450 250 300 335 400 425 450 475 475 500 530 560 355 425 500 530 530 560
26、 630 670 670 710 450 530 560 760 7 8 10 12 47 5 500 530 560 up to mm 3 4 8 9 10 12 14 16 18 4 6 8 12 14 16 18 20 22 24 28 8 12 18 20 22 24 32 36 40 44 12 18 24 44 up to mm 355 400 530 560 560 630 670 710 750 425 500 560 670 710 750 800 ao0 850 900 950 600 710 a50 900 900 950 1060 1120 1120 1250 760
27、900 950 1290 9 CLm Over mm 7 Pm Over mrn 8 Clm 236 265 - 8 Pm 9 Pm 4 O0 4 50 425 475 560 6 O0 7 50 530 630 710 7 50 800 850 900 560 630 850 900 900 1 O00 1060 1120 1180 6 70 800 900 1060 1120 1180 1250 1250 1320 1400 1500 950 1120 1320 1400 1400 1500 1700 1800 1800 1900 1200 1400 1480 2000 5.6 11,2
28、190 212 300 335 11,2 31 5 355 5,6 11,2 200 224 265 250 280 335 31 5 355 400 450 560 - 335 375 450 265 300 355 375 475 335 11.2 - 22,4 - 45 22.4 22.4 45 90 - 180 475 600 280 355 355 450 250 300 335 31 5 375 425 400 475 530 425 500 560 22,4 45 355 375 400 425 450 475 500 530 560 600 630 710 600 630 67
29、0 710 265 300 400 335 37 5 500 42 5 475 630 670 670 750 800 850 900 500 600 670 800 - - - 450 500 670 425 42 5 475 530 530 600 710 710 800 45 90 500 530 560 315 375 425 500 - 630 670 710 400 475 530 630 - 850 900 950 530 630 710 850 900 950 1 O00 530 560 600 670 710 750 850 900 950 950 1 O00 1060 11
30、20 - 90 180 90 1 O00 1060 1120 1180 600 630 670 710 750 850 900 ao0 750 900 1060 450 530 630 560 670 800 710 850 1 O00 1120 1120 1180 670 670 710 850 850 900 1060 1060 1120 180 355 180 355 800 850 850 900 560 670 710 950 - 1 O00 106C 1060 1120 1250 1320 1320 1400 1320 1400 1400 1500 9 50 1120 1180 1
31、610 - 71 O 850 900 1220 900 1060 1120 1520 355 - 640 355 - 640 - Page 6 DIN 513 Part 3 N L 8 Recommended tolerance zones In order to reduce the number of gauges and tools, only the tolerance zones given in tables 10 and 11 shall be selected. If a length of thread engagement is not known, thread enga
32、gement group N is recommended. Tools and gauges shall always be marked with the tolerance zone in order to avoid confusion with tools used pre- viouslv. 2.24 P. dor2 UP to 6,7 P. doe2 Over 6,7 P . d02 Table 12. Tolerance grade 7 8.1 Tolerance zones for pitch diameters of internal threads Table 10. 8
33、 9 Tolerance zones for Thread engagement group Tolerance quality Multiple Of Td2 Of tolerance grade 6 1,7 2,12 2,65 8.2 Tolerance zones for pitch diameters of external threads Table 11. Medium Coarse Tolerance zones for pitch diameters Thread engagement group Tolerance quality Medium 7H 8H 8H 9H Coa
34、rse 8c 8.3 Tolerance zone for minor diameters of internal threads Only tolerance zone 4H shall apply for the minor diam- eter of the internal thread. 9c 8.4 Tolerance zone for major diameters of external threads Only tolerance zone h9 (see DIN 7160) shall apply for the major diameter of the external
35、 thread. 8.5 Tolerance zone for major diameters of internal threads Only tolerance zone HI0 (see DIN 7161) shall apply for the major diameter of the internal thread. 8.6 Tolerance zone for minor diameters of external threads The minor diameter tolerance Td3 is a function of the pitch diameter tolera
36、nce Td2 (see subclause 9.5). 9 Formulae 9.1 Lengths of thread engagement The lengths of thread engagement are to be calculated in accordance with table 12. I I Length of thread engagement 9.3 Tolerances TD1 The minor diameter tolerances TD of tolerance grade 4 are to be calculated using the followin
37、g formula: TD = 0,63 (230 . PO,) with TD in pm and P in mm. 9.4 Tolerance Td2 The pitch diameter tolerances Td2 of tolerance grade 6 are to be calculated using the following formula: with T, in pm and P and d in mm. In the formula, d is the geometric mean of the range of nominal diameters. The pitch
38、 diameter tolerances Td2 for other tolerance grades are obtained by multiplying the pitch diameter tolerances for external threads of tolerance grade 6 by the factors given in table 14. Table 14. T = 90 POP . do, d2 Tolerance grade Multiple Of Td2 Of tolerance grade 6 9.5 Tolerances Td3 The minor di
39、ameter tolerances Td3 are to be calculated using the following formula: Td3 = ( 1,25 . Td2 ) + A, with Ao (absolute value), Td2 and Td3 in pn 9.6 Fundamental deviation Ao For tolerance position c up to P = 2 mm, AO = - (125 + 11 P) pm. For tolerance position c at P = 44 mm, Ao = 630 pm. The values o
40、f AO for intermediate pitches have been determined on the basis of empirical values (see table 2). DIN 513 Part 3 Page 7 9.7 Rounding rules The major, pitch and minor diameter tolerance values are to be calculated using the formulae given in the above clauses and then rounded to the nearest value of
41、 the R 40 series of preferred numbers, except for the tolerances Td3 for the minor diameter of the external thread. 10 Multiple-start buttress threads In the case of multiple-start buttress threads, the pitch P = lead P (axial distance between two neighbouring flanks being in the same direction) of
42、the single-start buttress thread is used as the basis for the fundamental deviation Ao and the minor diameter tolerances for the internal thread TD. On the other hand, the tolerances for the pitch diameter of the internal thread, TD, and external thread, Td2, of the multiple-start thread of lead Ph
43、(axial advance at one turn) are to be increased. The basis for this is the pitch diameter tolerance of the single-start buttress thread with pitch P. These tolerances are to be multiplied by a factor from the R 20 series of preferred numbers associated with the number of starts, in accordance with t
44、able 15. Table 15. Number of starts (R20) factor If multiple-start threads are fabricated with large pitches for which it is no longer possible to read off the tolerances TD and Td2 in tables 8 and 9, the values of TD2 and Td2 shall be calculated using the formulae given in sub- clauses 9.2 and 9.4.
45、 Standards referred to DIN 13 Part 14 IS0 metric screw threads; principles of a tolerance system for screw threads from 1 mm diameter upwards DIN 13 Part 15 IS0 metric screw threads; fundamental deviations and tolerances for screw threads from 1 mm diam- eter upwards DIN 513 Part 2 Metric buttress t
46、hreads; general plan DIN 7160 IS0 deviations for external dimensions (shafts) for nominal sizes from 1 to 500 mm DIN 7161 IS0 deviations for internal dimensions (holes) for nominal sizes from 1 to 500 mm DIN 55 350 Part 11 Terminology in quality assurance and statistics; concepts relating to quality
47、 assurance; basic concepts Other relevant standards DIN 513 Part 1 Metric buttress threads; thread profiles DIN 2244 Screw threads; concepts Previous editions DIN 513 Part 3: 01.75 Amendments The following amendments have been made in comparison with the January 1975 edition: a) The status of the st
48、andard is no longer that of a preliminary standard. b) The standard has been editorially revised. Explanatory notes (See also Explanatory notes to DIN 513 Part 1,) The application of a standard tolerance system to all types of screw thread is of great economic benefit in practice. Therefore, the IS0
49、 tolerances recommended for screw threads with pitches up to 6 mm have also been adopted for buttress threads. For pitches over 6 mm, the tolerance system for buttress threads has been extended correspondingly One main advantage of applying a standard tolerance system to all types of screw thread is that the designation of the tolerance zones is the same for all threads and the numerical values expressed by the tolerance symbol are the same. The relevant series have been selected from the extended IS0 system of tolerances for screw threads. This standard specifies a tol
