1、DEUTSCHE NORM June 1997 Metric taper external and mating parallel internal screw threads Part 2: Gauges and gauging DIN 158-2 ICs 17.040.30; 21.040.1 O Descriptors: Metric taper external screw threads, parallel internal screw threads, gauges, gauging. Metrisches kegeliges Auengewinde mit zugehrigem
2、zylindrischem Innengewinde -Teil 2: Lehrensystem, Anwendung der Lehren, Berechnung der Lehrenmae und Baumerkmale In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used throughout as the decimal marker. Foreword This
3、standard has been prepared by the Section Gewinde of the Normenausschu Technische Grundlagen (Fundamentals in Technology Standards Committee), Technical Committee Prfung. It is based on DIN 2999-2 which specifies a gauging system for Whitworth pipe threads. 1 Scope and field of application This stan
4、dard specifies a gauging system for metric taper external threads and mating parallel internal threads as specified in DIN 158-1. Gauging of parallel internal threads is to be carried out as specified in IS0 1502. 2 Normative references This standard incorporates, by dated or undated reference, prov
5、isions 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 incorporated in it
6、 by amendment or revision. For undated references, the latest edition of the publication referred to applies. DIN 82 DIN 158-1 DIN 2239 DIN 2240-1 DIN 2240-2 DIN 2244 DIN 2282-1 DIN 2282-2 DIN 2999-2 DIN 6784 IS0 1502 Straight knurls Metric taper external and mating parallel internal screw threads -
7、 Dimensions, tolerances and inspection Gauges for use in dimensional metrology - Requirements and testing Gauge handles for gauging members up to 40 mm nominal diameter with 1 : 50 taper shank Gauge handles for gauging members over 40 mm nominal diameter - Handles, fixing screws and locking prongs S
8、crew threads - Terminology GO screw gauging members for workshop plug gauges, check plugs and setting plugs for IS0 metric screw threads from 1 mm up to 40 mm nominal diameter GO screw gauging members for workshop plug gauges, check plugs and setting plugs for IS0 metric screw threads over 40 mm up
9、to 200 mm nominal diameter Pipe threads for pipes and fittings - Parallel internal threads and taper external threads - Gauges and gauging Workpiece edges - Terminology, finishes and indications on drawings IS0 general-purpose metric screw threads - Gauges and gauging Continued on pages 2 to 8. Tran
10、slation 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 158-2 : 1997-0 V Deutsches Institut fur Normung e. V., Berlin. English price group O
11、9 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 158-2 : 1997-06 bl b2 3 Concepts amd symbols 3.1 Concepts For the purposes of this standard, the concepts defined in DIN 2244 shall apply. 3.2 Symbols In addition t
12、o the symbols specified in DIN 158-1, the following are used in this standard. Table 1: Symbols Width of clearance groove at major diameter of thread profile of a parallel limit screw ring gauge Width of clearance groove at minor diameter of thread profile of taper screw check DIUCIS I Symbol I Quan
13、tity b3 b4 Overall width of parallel limit screw ring gauges Width of threaded portion of parallel limit screw ring gauges 14 rl I c I Height of step face on taper screw check plugs Distance between end face and step face of taper screw check plugs Radius of clearance groove of root profile of paral
14、lel limit screw ring gauges I d4 I Major diameter of parallel limit screw ring gauges I 1, I Length of threaded portion of taper screw check plugs I r7 I Radius of clearance groove of root profile of taper screw check plugs I Ta,2 I Tolerance on flank angle I TCp I Tolerance on pitch diameter of tap
15、er screw check plugs I Tp I Tolerance on pitch of gauges I TpL I Tolerance on pitch diameter of taper screw plug gauges I TR I Tolerance on pitch diameter of parallel limit screw ring gauges 4 Gauges and gauging 4.1 General Metric taper external threads shall be gauged at the gauge plane using a par
16、allel limit screw ring gauge which has a full-form internal thread. The use of such gauges ensures functional adequacy of the mating pairs even where there is crowning of the profile. During manufacture, parallel limit screw ring gauges shall be checked with a taper screw check plug and regularly mo
17、nitored during use using a wear check plug. Parallel internal threads shall be gauged in accordance with the gauging system specified in IS0 1502 since this is more economical. Gauging by means of taper screw plugs is to be agreed upon. 4.2 Limit screw gauge rings Parallel limit screw ring gauges as
18、 specified in subclause 6.1 are used to check the functional adequacy of the thread at the gauge plane. The width of such gauges shall be equal to the maximum distance of the gauge plane from the end face of the external thread (dimension b). The step face shall cover the tolerance range along the l
19、ength of the external thread. A taper screw check plug as specified in subclause 6.2 shall be used to check parallel limit screw ring gauges, including their pitch diameters. The ring gauge shall be manually screwed on the workpiece being gauged, without using excessive force and so that there is no
20、 perceptible clearance between the workpiece and the gauge. The external thread is true to gauge if the end face of the threaded portion does not protrude beyond the step face of the ring gauge. 4.3 Check plug for limit screw ring gauges Taper screw check plugs as specified in subclause 6.2 are to b
21、e provided with a step face, with the distance between the end face and the step face, 14, being equal to the overall width of the parallel limit screw ring gauge, b,. The check plug itself is to be checked by direct measurement. A taper screw check plug shall be used to check parallel limit screw g
22、auges during manufacture and for acceptance inspection purposes. Assuming the gauge has been properly assembled as described in sub- clause 4.2, a new limit screw ring gauge is deemed accepted if its gauge plane lies within a tolerance range of I0,l P with respect to the step face of the check plug
23、(see figure 1). Page 3 DIN 158-2 : 1997-06 4.4 Checking for wear of limit screw ring gauges There shall be a reference mark on the end face of check plugs. For acceptance inspection or before the first use, the user shall make a similar mark on the end face of the ring gauge. When checking the ring
24、gauge for wear by means of a taper check plug, the ring gauge shall be rejected if the plug enters the gauge by more than one-quarter turn (which is equal to P/4). 5 Gauge thread profiles and dimensions 5.1 Parallel limit screw ring gauges shall have a profile as shown in figure 2. This may have a c
25、learance groove which tangentially contacts the straight part of the flank but shall have either a maximum width, blmax, or a maximum radius, rlmax, as specified in table 2. The form of the groove shall be at the manufacturers discretion. Profile of parallel limit screw ring gauges 5.2 Profile of ta
26、per screw check plugs Parallel limit screw ring gauges shall have a profile as shown in figure 3. This may have a clearance groove which tangentially contacts the straight part of the flank but shall have either a maximum width, bZmax, or a maximum radius, rzmax, as specified in table 2. The form of
27、 the groove shall be at the manufacturers discretion. Step face of check plug Taper screw check plug Gauge plane of ring gauge Parallel limit screw ring gauge End face of ring gauge End face of check plug Figure 1: Inspection of a limit screw ring gauge with a taper screw check plug X Detail x Figur
28、e 2: Thread profile for parallel limit screw ring gauge Page 4 DIN 158-2 : 1997-06 L + a, a, .- s U O L ia r , Detail w Gauge type a, O O a, u H o r, =O,144P=- C b2mau = - o 6 P 4 Thread profile as in figure H r, Figure 3: Thread profile for taper screw check plug Table 2: Dimensions of profiles as
29、shown in figures 2 and 3 Dimensions in mm 5.3 Formulae for the calculation of gauge dimensions of check plugs (in gauge plane) and of ring gauges (in reference plane) Table 3: Gauge dimensions I l3 Check Plug I Dimensions of gauge thread3) Major diameter I Pitch diameter Required dimension Minimum =
30、 d + SpL, or with clearance groove (b,) d Limit Required deviations dimension -I- Limit deviations Not toler- anceci) TCP * 1 -r- 2 Minor diameter Required I Limit 1 dimension deviations I I ITR 2 d- 2H, Maximum = di- TR- Tep, or with clearance groove b,) I) The pitch diameter has not been tolerance
31、d because the manufacturing tolerance is obtained when the ring ?) This tolerance also applies if the pitch diameter is measured at any other position. 3) d, d;, diand H, as in DIN 158-1. gauge is screwed on the screw check plug. Page 5 DIN 158-2 : 1997-06 M 6 keg M 10 x 1,25 keg and M 12 x 1,25 keg
32、 M 8xlkeg to M12xlkeg 5.4 Manufacturing tolerances for gauges I 10 8 5 Standard design M 33x 1,5 keg to M 52 x 1,5 keg M 27 x 2 keg to M 60 x 2 keg - Table 4: Manufacturing tolerances Dimensions in um 18 12 10 5 24 14 12 5 M 5 keg M 6 keg M 8x1 keg to M 12x 1 keg M 10 x 1,25 keg and M 12 x 1,25 keg
33、M 12 x 1,5 keg M 27 x 2 keg to M 52 x 1,5 keg to M 33 x 2 keg M 36 x 2 keg to M 60 x 2 keg 1141101 B151 M 12 x 13 keg to M 30 x 1.5 keg I) The pitch tolerance, Tp, applies to any number of threads within the threaded portion of the gauge. The tolerance zone for the pitch may lie either above or belo
34、w the zero line with respect to the basic size. Table 5: Tolerances on flank angle Dimensions in minutes Pitch, P, f 14 6 Designation and design features of gauges 6.1 Limit screw ring gauge (2) Parallel limit screw ring gauge -0,3l) 62 RGE 0,5 to 1 knurl, Turn - out DIN 82 104-1 Reference plane Dim
35、ensions in mm Reference mark (to be provided by user) / l) Edges as in DIN 6784. Figure 4: Limit screw ring gauge Page 6 DIN 158-2 : 1997-06 Standard design Designation of a parallel limit screw ring gauge (Z) for metric taper external thread M 30 x 2 keg, standard design: Ring gauge DIN 158 - Z - M
36、 30 x 2 keg Ring gauge DIN 158 - Z - M 30 x 2 keg short Designation of a parallel limit screw ring gauge (Z) for metric taper external thread M 30 x 2 keg, short design: Short design Table 6: Nominal sizes and limit deviations for limit screw ring gauges b4 Limit deviations Thread size b3 Limit devi
37、ations M 8x 1 keg M 10 x 1 keg M 12x 1 keg M 12x 1,25 keg M 12x 1,5 keg M 14 x 1,s keg M 16 x 1,s keg M 18 x 1,s keg M 20 x 1,5 keg M 22x 1,5 keg M 24x 1,5 keg M 26x 1,5 keg M 27 x 1,s keg M 30 x 1,5 keg M 33 x 1,s keg M 36 x 1,5 keg M 38 x 1,s keg M 39 x 1,s keg M 42 x 1,5 keg M 45 x 1,5 keg M 48 x
38、 1,5 keg M 52x 1,s keg M 27 x 2 keg M 30 x 2 keg M 33 x 2 keg M36x2 keg M39x2 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 393 42 589 7,5 985 10.5 11.8 1 Limit rleviations f 0.01 i 0,014 f 0.01 8 f 0,02 i 0,03 i 0,03 f 0,036 595 I I f0,018 4,85 f0,013 k 0,03 7,9
39、f0,02 i: 0,03 9 I0,02 2.5 3,55 4,75 5,9 7 Limit f 0,Ol f 0,013 38 45 k 0,015 53 63 71 f 0,oz 85 1 O0 63 71 71 f 0,02 85 f 0,024 1 O0 Page 7 DIN 158-2 : 1997-06 6.2 Taper screw check plugs Check plug (K) for thread sizes M 5 to M 39x 1,5 and M 39 x2 Gaugeheference plane Reference mark, perpendicular
40、to Turn -o ut of p I ug gauges optional Dimensions of gauging member as in DIN 2282-1 Check plug (K) for thread sizes M 42 x 1,5 to M 52 x 1,5 and M 42 x 2 to M 60 x 2 Dimensions and other details as for figure above. Gauging member as in GE25 gauge handle to DIN 2282-2 , DIN 2240-2, Detail Y M 12 x
41、 1,5 fixing screw as in DIN 2240-2 The mid-point of the step face should be located on the thread flank at the point where the imaginary pitch cylin- der intersects this flank. Figure 5: Screw check plugs Designation of a taper screw check plug (K) for M 30 x 2 parallel limit screw ring gauges, stan
42、dard design: Check plug DIN 158 - K - M 30 x 2 Check plug DIN 158 - K - M 30 x 2 short Designation of a taper screw check plug (K) for M 30 x 2 parallel limit screw ring gauges, short design: Page 8 DIN 158-2 : 1997-06 12 Table 7: Dimensions and limit deviations for taper screw check plugs 6,25 Thre
43、ad size M 5 keg M 6 keg M 8x 1 keg M lox 1 keg M12xi keg M 10 x 1,25 keg M 12 x 1,251 keg M 12 x 1,5 keg M 14 x 1,5 keg M 16 x 1,5 keg M 18 x 1,5 keg M 20x 1,5 keg M 22x 1,5 keg M 24x 1,5 keg M 26 x 1.5 keg M 27 x 1,5 keg M 30 x 1,5 keg M 33 x 1,5 keg M 36 x 1,5 keg M 38 x 1,5 keg M 39x 13 keg M 42
44、x 1,5 keg M 45 x 1,5 keg M 48x 1,5 keg M 52 x 1,5 keg M 27 x 2 keg M30x2 keg M33x2 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 60x 2 keg Standard design 10 12 14 18 18 333 4.2 589 7,5 9,5 10.5 11.8 4 Limit deviations * 0,Ol 5 0,Ol 4 rt 0,018 f0,02
45、 f 0,03 f 0,03 ?r 0,036 Short design min. I I 14 Limit deviations - f 0,Ol f 0,013 I 0.01 5 f0,02 f 0,02 k 0,024 Dimensions in mm Gauge handle: to DIN 2240-1 or DIN 2240-2 R4 FF R5,5 2.41 R7 I R9 I GE25 4 1 R12 6.3 Requirements 6.3.1 Incomplete turns of thread at the run-out in the gauge plane shall
46、 be removed down to a three-quarter turn of thread (to withinIl/4 turn). The transition from a completely removed profile to afull-form profile shall lie within the tolerances specified. Ring gauges shall conform to the technical delivery conditions specified in DIN 2239. They shall bear the DIN num
47、ber, the symbol Z, the thread size and the manufacturers trademark. Parallel limit screw ring gauges 6.3.2 Taper screw check plugs Incomplete turns of thread at the run-out in the gauge plane shall be removed down to a three-quarter turn of thread (to withinIl/4 turn). The transition from a completely removed profile to afull-form profile shall lie within the tolerances specified. Check plugs shall conform to the technical delivery conditions specified in DIN 2239. They shall bear the DIN number, the symbol K, the thread size and the manufacturers trademark.
