1、DEUTSCHE NORM June 1997 Metric taper external and mating parallel internal screw threads Part 1 : Dimensions, tolerances and inspection DIN 158-1 ICs 21.040.1 O Descriptors: Metric taper external screw threads, parallel internal Supersedes DIN 158, August 1986 edition. screw threads, dimensions, tol
2、erances, inspection. Metrisches kegeliges Auengewinde mit zugehrigem zylindrischem Innengewinde - Teil 1 : Nennmae, Grenzabmae, Grenzmae und Prfung In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used throughout as
3、 the decimal marker. Foreword This standard has been prepared by the Section Gewinde of the Normenausschu Technische Grundlagen (Fundamentals in Technology Standards Committee). Amendments The following amendments have been made to the August 1986 edition of DIN 158. a) The number of the standard ha
4、s been changed. b) The values of thread height, h, have been amended (cf. table 2), taking into consideration the limit deviations specified in table 3. c) The designation of taper external threads has been amended to include the letters keg (taper) to distinguish them from parallel external threads
5、. d) The standard has been editorially revised. Previous editions DIN 158-1: 1954-06; DIN 158: 1971-04, 1986-08. Dimensions in mm 1 Scope and field of application This standard specifies profiles, dimensions and methods of verification for general purpose metric taper external threads intended to be
6、 mated with parallel internal threads with a basic profile as specified in Taper external threads as specified in this standard are intended for self-sealing joints, such as those employed on pipe plugs, compression couplings and lubricating nipples. They can be used in all cases where a parallel th
7、readed joint with washer is unsatisfactory for technical or economic reasons. For fluids such as oils, other liquids and gases, no thread sealants are required for joints where the nominal size is small. For joints of greater nominal size, it is recommended that sealants be applied, since the leakti
8、ghtness of such joints decreases as the diameter increases. A short design taper external thread has been specified along with the standard design both to be mated with general purpose IS0 metric parallel internal threads of tolerance class 4H for the pitch diameter and 5H for the minor diameter (as
9、 in ISO/DIS 965-1). ISO/DIS 68-1. Continued on pages 2 to 1 O. Translation by DIN-Sprachendienst. In case of doubt, the German-language original should be consulted as the authoritative text. No pari of this translation may be reproduced without the prior permission of Ref. No. DIN 158-1 : 1997-0 V
10、Deutsches Institut fur Normung e. V., Berlin. English price group O9 Sales No. 0109 03.99 Beuth Verlag GmbH, D-10772 Berlin, has the exclusive right of sale for German Standards (DIN-Normen). Page 2 DIN 158-1 : 1997-06 a b d 2 Normative references This standard incorporates, by dated or undated refe
11、rence, provisions from other publications. These normative references are cited at the appropriate places in the text and the titles of the publications are listed below. For dated references, subsequent amendments to or revisions of any of these publications apply to this standard only when incorpo
12、rated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. DIN 13-1 IS0 metric screw threads - 1 mm to 68 mm diameter coarse pitch threads - Nominal sizes*) DIN 13-5 IS0 metric screw threads - 1 mm and 1,25 mm fine pitch threads with diam
13、eters from 7,5 mm to 200 mm - Nominal sizes*) DIN 13-6 IS0 metric screw threads - 1,5 mm fine pitch threads with diameters from 12 mm to 300 mm - Nominal sizes*) DIN 13-7 IS0 metric screw threads - 2 mm fine pitch threads with diameters from 17 mm to 300 mm - Nominal sizes*) DIN 13-19 IS0 metric scr
14、ew threads - Basic profile and manufacturing profiles*) DIN 158-2 Metric taper external screw threads and mating internal parallel screw threads - Part 2: Gauges and gauging DIN 2244 Screw threads - Terminology ISO/DIS 68-1 : 1998 IS0 general purpose screw threads - Basic profile ISO/DIS 965-1 : 199
15、8 IS0 general purpose metric screw threads - Tolerances - Part 1: Principles and basic data ISO/DIS 965-3 : 1998 IS0 general purpose metric screw threads - Tolerances - Part 3: Deviations for constructional threads IS0 1502 : 1996 IS0 general-purpose metric screw threads - Gauges and gauging 3 Conce
16、pts amd symbols 3.1 Concepts For the purposes of this standard, the concepts specified in DIN 2244 shall apply. 3.2 Symbols For symbols, see table 1. Table 1: Symbols Distance from reference plane to external thread end Gauge length Major diameter of external thread at gauge plane I Symbol I Quantit
17、y d3 D Minor diameter of external thread at gauge plane Maior diameter of internal thread I d, I Pitch diameter of external thread at gauge plane d d; Major diameter of external thread at gauge plane Pitch diameter of external thread at gauge plane I D, I Minor diameter of internal thread Hl h, I D,
18、 I Pitch diameter of internal thread Flank overlapping Height of thread R P I d; I Minor diameter of external thread at gauge plane Root radius Pitch I H I Height of triangle of thread profile perpendicular to thread axis I 1, I Useful length of external thread I 1, I Useful length of internal threa
19、d X I Thread run-out *) At present at the stage of draft. Page 3 DIN 158-1 : 1997-06 4 Design profiles and designation 4.1 Taper external threads The nominal sizes, limit deviations and limits of size are given in tables 2, 3 and 4, respectively. d,=d- d,=d- ni I 1 J3 H=-P=O,866025 P 2 pi, = 0,54126
20、6 P = 518 II h, = 0,613435 P I1 H 6 R=-=0,144338 P Thread axis (3 I-. Figure 1: Design profile of a metric taper external thread Designation of a standard design M 30 x 2 keg external thread: Thread DIN 158 - M 30 x 2 keg Thread DIN 158 - M 30 x 2 keg short Designation of a short design (short) M 30
21、 x 2 keg external thread: Page 4 DIN 158-1 : 1997-06 d ,.Y I.- T- -? 7 7 N m CO- CO T Y Co m 0- 7 N W ? Ni CU % m L“ W v) :j In“ T 7 ON TT- N CU m + N t. O 2 I.- W O o? In LD 2 m m “? O -? a* rn - cn a, Y l- X d (U I - a, N v .- 0 a, x UI a, Y cn a, Y X v- c I - l- X Co I - v- X E z - ON (UN 5E Page
22、 5 DIN 158-1 : 1997-06 Im a! m O 7 -t- -7- q O m d L .- O Y= a E- E m o= s zg ; .O ; ;= a u .EJ =% ZU .- .- 0 m W T- li ai o - cn cn O Q a, a, 1 U a, O (u a, a 3 O 1 cn cn a, N cn U a, a, Y o L 5 -0 0 .- + 2 m N d 7 o) O 7 I? 9 c .- 2h a N I a, N cn n l3 a, .- L E Page 6 DIN 158-1 : 1997-06 4.2 Para
23、llel internal threads Parallel internal threads shall have the basic profile specified in ISO/DIS 68-1. The maximum and minimum material profiles shall be as given in DIN 13-19*). The nominal sizes of coarse pitch threads shall conform to DIN 13-1*), those of fine pitch threads with pitches of 1 mm
24、or 1,25 mm to DIN 13-5*), with a pitch of 1,5 mm to DIN 13-6*), and those with a pitch of 2 mm, to Limit deviations shall be as given in ISO/DIS 965-3. Limits of size and the useful length, l, shall be as given in table 5 and clause 5, respectively. The thread designation shall conform to ISO/DIS 96
25、5-1. Example of designation for a metric parallel internal thread (M), with a nominal diameter of 30 mm and a pitch of 2 mm (fine pitch thread), of tolerance class 4H for the pitch diameter and tolerance class 5H for the minor diameter: DIN 13-7*). Thread DIN 158 M 30 x 2 - 4H 5H 5 Tolerances, limit
26、 deviations and limits of size Parallel internal thread Taper external thread -1:16 r- I Taper external thread Reference plane Gauge plane l) Internally threaded parts shall be capable of receiving external threaded parts up to the useful length, Z, ,) Assuming a free thread run-out, length 1, of th
27、e internal thread shall not be less than 80 % of 1,. 3) It is recommended that the thread run-out, x, be 1,5 P. making full use of dimension a. Figure 2: Internal and external threads (notation) *) At present at the stage of draft. Page 7 DIN 158-1 : 1997-06 Standard design f 0,5 Table 3: Limit devi
28、ations for external threads Short design - Thread size M 5 keg M 6 keg M 8x1 keg M10x1 keg M12x1 keg M 10 x 1,25 keg M 12 x 1,25 keg M 12 x 1,5 keg M 14 x 1,s keg M 16 x 1,s keg M 18 x 1,5 keg M 20 x 1,5 keg M 22 x 1,s keg M 24 x 1,5 keg M 26 x 1,5 keg M 27 x 1,s keg M 30 x 1,5 keg M 33 x 1,5 keg M
29、36 x 1,5 keg M 38 x 1,5 keg M 39 x 1,5 keg M 42 x 1.5 keg M 45 x 1.5 keg M 48 x 1,5 keg M 52 x 1,5 keg M 27 x 2 keg M 30 x 2 keg M 33 x 2 keg M 36 x 2 keg M 39 x 2 keg M 42 x 2 keg M 45 x 2 keg M 48 x 2 keg M 52 x 2 keg M 56 x 2 keg M 60 x 2 keg f 0,7 ? 0,5 f 0.9 f 0,65 fl k 0.75 f 1,5 f1 Major, pit
30、ch and minor diameters*) Standard design ? 0,03 f 0,045 f 0,056 I 0,063 f 0,094 10.115 Short design - i 0.03 f 0.04 t: 0,047 f 0,063 f 0,075 *) The limit deviations for a and b are only applicable to the basic thread sizes listed in table 2. *) The limit deviations apply at any cross section (perpen
31、dicular to the thread axis) and within length 1,. (The tolerance zone thus lies parallel to the generatrix of the basic taper.) These limit deviations apply only when the threads are measured, in which case it shall be assumed that dimensions a and b are nominal sizes (cf. clause 6). Page 8 DIN 158-
32、1 : 1997-06 arou7 NNN NWO mmw m“ m“ m a, N v U a a, c + .- L Page 9 DIN 158-1 : 1997-06 27 30 P 1 25,701 25,841 24,835 25,135 28,701 28,841 27,835 28,135 Figure 3: Parallel internal thread (tolerance position H) 33 36 39 Table 5: Limits of size for parallel internal threads (with tolerance class 4H
33、for pitch diameter and 5H for minor diameter) (derived from ISO/DIS 965-3) 31,701 31,841 30,835 31,135 34,701 34,841 33,835 34,135 37,701 37,841 36,835 37,135 Thread size 42 45 48 M12x1 M 10 x 1,25 M 12 x 1,5 M 14 x 1,5 40,701 40,841 39,835 40,135 43,701 43,841 42,835 43,135 46,701 46,851 45,835 46,
34、135 M 16 x 1,5 M 18 x 1,5 M 20 x 1,5 52 56 60 M 22 x 1,5 M 24 x 1,5 M 26 x 1,5 50,701 50,851 49,835 50,135 54,701 54,851 53,835 54,135 58,701 58,851 57,835 58.1 35 M 27 x 1,5 M 30 x 1,5 M 33 x 1,5 M 36 x 1,5 M 38 x 1,5 M 39 x 1,5 M 42 x 1,5 M 45 x 1,5 M 48 x 1,5 M 52 x 1,5 M27x2 t M30x2 M33x2 M36x2
35、M39x2 M42x2 M45x2 M48x2 M56x2 M60x2 Pitch diameter, D, Minor diameter, D, 4H 5H Minimum major diameter, D I Maximum Minimum I Maximum Minimum 4,134 4,294 5,445 4,917 5,107 8 7,35 7,445 6,917 7,107 5 6 9,445 8,917 9,107 11,35 11,45 10,917 11,107 9,188 935 I 9,288 8,647 8,859 10 12 10 10,647 10.859 11
36、,144 10,376 10.61 2 I 13,144 113 12,376 12,612 12 11,188 12 11,026 14 13,026 16 15,026 15,144 14,376 14,612 18 17,026 17,144 16,376 16,612 20 19,026 19,144 18,376 18,612 22 21,026 21,144 20,376 20,612 24 23,026 23,151 22,376 22,612 26 25,026 25,151 24,376 24,612 27 26,026 26,151 25,376 25,612 30 29,
37、026 29,151 28,376 28.61 2 33 32,026 32,151 31,376 31,612 36 35,026 35,151 34,376 34,612 38 37,026 37,151 36,376 36,612 39 38,026 38,151 37,376 37,612 42 41,026 41,151 40,376 40,612 45 44,026 44,151 43,376 43,612 48 47,026 47,158 46,376 46,612 Page 1 O DIN 158-1 : 1997-06 6 Inspection In practice, ta
38、per external threads are mostly checked using commercial screw gauges. The end face of the threaded portion is pressed against a step in the gauge (tolerance step), and the limits of size of the thread at the gauge plane are determined, disregarding dimensions a and b (since these dimensions may be
39、taken as theoretically exact). Normally, thread diameters are measured at the gauge plane. However, in order to detect any crowning of the thread, the thread dimensions may be checked at the reference plane (or any other plane along the useful thread I ength). Gauges should be selected according to
40、the thread parameters that are being checked. For instance, taper screw ring gauges are suitable when checking all thread parameters, whereas parallel screw ring gauges are adequate when only the function of the thread is being checked. In both cases, however, the width of the gauge ring has to be a
41、djusted for the thread design (standard or short). The ring is then screwed on the workpiece and the distance between the end faces of the workpiece and gauge is established. When the ring gauge is provided with a step face, the end face of the workpiece thread is not to protrude beyond this step. (
42、DIN 158-2 specifies parallel ring gauges with tolerance steps, in accordance with IS0 1502.) Although the incomplete thread of parallel ring gauges must be removed, this may influence the inspection results. For this reason, such gauges are to be regularly checked for wear using taper screw check pl
43、ugs. Since gauging and measuring threads may lead to different results, there is a risk of rejection in marginal cases. It is therefore recommended that manufacturers and their clients agree on the method to be used. Where no agreement has been made, results of gauging in accordance with DIN 158-2 s
44、hall be decisive. Explanatory notes This standard specifies taper external threads with a basic taper of 1 : 16 and a thread profile that is perpen- dicular to the thread axis. It is more economical to mate taper external threads with the parallel internal threads specified here rather than with tap
45、er internal threads, as the former are easier to manufacture. To cater for thin-walled components that require short thread lengths, a short design of taper external thread has been specified along with the standard design. The nominal sizes given in table 2 are based on the assumption that the dime
46、nsions lie perpendicular to the thread axis at the reference or gauge plane. The limit deviations for the thread diameters have been calculated from the following formula: A, = IA x C, where C = 1 : 16, .e. *As where A, is the thread diameter; A, is the deviation for dimensions a or b; C is the taper.
