1、.- UDC 621.882.082.4 DEUTSCHE NORMEN April 1977 IS0 Metric Trapezoidal Screw Thread General Plan - DIN 1 03 Part 2 Metrisches ISO-Trapezgewinde; Gewindereihen This Standard conforms essentially with the International Standard IS0 2902- Organization for Standardization (ISO). IS0 metric trapezoidal s
2、crew threads; general plan 977 issued by the International 1 Introduction This Standard contains IS0 metric trapezoidal screw threads with profiles according to DIN 103 Part I. It is left to each branch of industry and the individual user to select those trapezoidal threadsfrom this Standard which c
3、orrespond to their requirements as regards diameterhead combinations. 2 Choice of diameter and. pitch (see Table in Section 4) For preference, the diameters of Series 1 and if necessary those of Series 2 should be selected. The diameters of Series 3 should be avoided for new designs. The pitches for
4、 a given diameter are shown in the corresponding row. The pitches indicated in boxes should be chosen for preference. If it is deemed necessary to use trapezoidal screw threads with diameters differing from those indicated in the Table, then one of the pitches in the Table in Section 4 which is allo
5、tted to the nominal thread diameter closest to the one required should be selected. 3 Designation The s i n g I e - s t a r t metric trapezoidal screw threads of this Standard are designated by the letters Tr followed by the nominal diameter of the thread and the pitch P of the single-start thread (
6、in this case lead P = pitch P) in mm, separated by the symbol x. Example: Tr 40 x 7 The m u I t i p I e - s t a r t metric trapezoidal screw threads of this Standard are designated by the letters Tr followed by the nominal diameter of the thread and the lead Ph of the multiple-start thread in mm, th
7、en by letter P (pitch) and the pitch in mm. Example: Tr 40 x 14 P7 Number of starts = Lead Ph Pitch P 14 7 -_ - forthis example. Hence this ex am P le concerns a two-start thread. For threads without tolerance indication the medium tolerance grade applies, .e. tolerance field 7 e for bolt threads an
8、d tolerance field 7 H for nut threads. If a different tolerance field is desired, then this shall be stated; in such cases, for example for a bolt thread with the tolerance field 8 e, the designation reads: Tr 40 x 7-8e. For a corresponding two-start thread the designation reads: Tr 40 x 14 P 7-8e.
9、Continued on pages 2 and 3 Explanations on page 3 ilnverkaul der Normen durch Beuth Verlag GmbH, Berlin 30 und Kln 1 09.79 DIN l.3 Teil 2 engi. Preisgr. 4 Vertr.-Nr. 0104 Page 2 DIN 103 Part 2 4 Thread diameters and pitches Dimensions in mm itart traaezoidal threads I DIN 103 Part 2 Page 3 Further s
10、tandards DIN 103 Part 1 DIN 103 Part 3 DIN 103 Part 4 DIN 103 Part 5 DIN 103 Part 6 DIN 103 Part 7 DIN 103 Part 8 DIN 103 Part 9 IS0 metric trapezoidal screw thread; profiles IS0 metric trapezoidal screw thread; allowances and tolerances for trapezoidal screw threads of general purpose IS0 metric tr
11、apezoidal screw thread; nominal dimensions IS0 metrictrapezoidal screw thread; limiting sizesfor nut threadsfrom 8 to 100mm nominal diameter IS0 metrictrapezoidal screw thread; limitingsizes for nut threads from 105 to300mm nominal diameter IS0 metric trapezoidal screw thread;limiting sizesfor boltt
12、hreadsfrom 8 to 100mm nominal diameter IS0 metric trapezoidal screw thread; limiting sizes for bolt threadsfrom105 to300mm nominaldiameter (Preliminary Standard) IS0 metric trapezoidal screw thread; gauges for bolt and nut threads, gauge dimensions and construction features Explanations The diameter
13、 series are subdivided into three ranges of application. The Series 3 diameters so far in use have been retained for the time being, but should be avoided in future for new designs. A maximum of no more than three pitches is recommended for use with each thread diameter. One of these pitches is desi
14、gnated as the preferred value in order to reduce the number of trapezoidal screw threads in use still further. If it is found necessary in special cases to use a diameter other than those indicated in the Table, then one of the pitches allocated to the diameter closest to the one required should be
15、selected. The ISO/TC 1 was of the opinion that trapezoidal screw threads over 300 mm in diameter are so seldom used that there was no point in making a recommendation for diameters beyond this range. The Series 1 diameters laid down in this Standard, together with their allotted pitches, are indicated graphically in the diagram below. Diameter x pitch combinations for single-start trapezoidal screw threads LL - LO 36- 32 28 20- 18 16 IL 2L22 t ;i 9 8 E E C 7 al 6 5 1, 3 .- c o c. p. .- 2 1.5 Preferred series Thread diameter d in mm 4
