1、UDC 621.882.082.4 : 621.753.3 DEUTSCHE NORM February 1985 103 I Part 9 IS0 metric trapezoidal screw threads Gauging of external and internal threads Gauge dimensions and design features - DIN Metrisches ISO-Trapezgewinde; Lehren fr Bolzen- und Muttergewinde, Lehrenmae und Baumerkmale Supersedes Augu
2、st 1973 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 marker. This standard gives specifications necessary for manufacturing gauges for IS0 metric trapezoidal screw threads
3、. General specifications relating to the gauging system, nomenclature, gauging of workpieces and handling of gauges have not been separately standardized for gauges for trapezoidal screw threads; for these, DIN 13 Part 16 and Part 18 shall be applied as appropriate. This standard specifies only the
4、required gauge dimensions and design features. The manufacturing tolerances have been increased in comparison with those specified in DIN 13 Part 17 by about 45% in order to compensate for the effect of the steeper flanks of the IS0 metric trapezoidal thread. Contents Page 1 .I Profiles with covplet
5、e flanks . 2 1.2 Profiles with truncated flanks . 3 2 Tolerance zones . 4 2.1 Tolerance zones for pitch diameter . 4 2.2 Tolerance zones for plain gauges . 5 3 Calculation of gauge dimensions 6 3.1 Gauges for workpiece external threads . 6 3.2 Gauges for the major diameter 9 3.3 Gauges for workpiece
6、 internal threads . 9 3.4 Gauges for the minor diameter 9 1 Thread profiles . 2 Page 4 Tolerances and permissible wear 1 O 5 General design features of screw gauges . I 1 5.1 Gauges for workpiece external threads . 1 1 5.1 .I Solid Go screw ring gauge 1 1 5.1.2 Go screw calliper gauge . 11 5.1.3 Set
7、ting plug for Go screw calliper gauge . 11 5.1.4 Not Go screw calliper gauge 11 5.1.5 Solid Not Go screw ring gauge . 11 5.2 Gauges for workpiece internal threads . 11 5.2.1 Go screw plug gauge . 11 5.2.2 Not Go screw plug gauge 11 5.3 Start of thread 12 Continued on pages 2 to 12 Beuth Verlag GmbH,
8、 Berlin 30 has exclusive sale rights for German Standards (DIN-Normen) DIN 103 Part 9 Engl. Price group 10 Sales No. O110 01.86 Page 2 DIN 103 Part 9 Pitch P 14 16 18 20 22 24 28 32 36 40 44 1 Thread profiles 1 .I Profiles with complete flanks The following gauges shall have a profile as shown in fi
9、gure 1 : Go check plug for new solid Go screw ring gauge; Go check plug for new solid Not Go screw ring gauge; Go screw plug gauge; setting plug for Go screw calliper gauge; Not Go check plug for new solid Not Go screw ring gauge; setting plug for Not Go screw calliper gauge; wear check plug for sol
10、id or adjustable Not Go screw ring gauge. R2 rnax. 1 1 1 1 1 1 1 1 1 1 1 P+ or -Tp Figure 1. Profile with complete flanks The following gauges shall have a profile as shown in figure 2: solid Go screw ring gauge; anvils of Go screw calliper gauge. 8 c al .- U .- 2 - These diameters do not exist on a
11、nvils of GO screw calliper gauges. Table 1. Values of R2 fnax Pitch rnax. ; 1 ! 0,5 1) P = pitch of single star The form of the root is at the manufacturers discretion. The maximum size of the minor diameter and R2 IIIIuL shall not be exceeded. Figure 2. Profile with complete flanks 1.2 Profiles wit
12、h truncated flanks The following gauges shall have a profile as shown in figure 3: Not Go check plug for new solid Go screw ring gauge; wear check plug for solid Go screw ring gauge; Not Go screw plug gauge. f- 0.1 t 0.1 f 0,l i 0,l f- 0,l i 0.15 f- 0.15 f- 0.15 t 0.15 f- 0,15 t 0.15 f- 0.15 I0.2 f-
13、 0.2 i 0,2 t 0.2 P+ or -Tp o, 1 O, 1 0,1 0,15 0.15 0,15 02 02 Figure 3. Profile with truncated flanks 16 18 20 22 28 32 36 40 44 24 The following gauges shall have a profile as shown in figure 4: solid Not Go screw ring gauge; anvils of Not Go screw calliper gauge. 1,6 1.8 2 22 2,8 32 3,6 4 4,4 2.4
14、- These diameters do not exist on anvils of Not Go screw calliper gauges. Figure 4. Profile with truncated flanks Gauges with truncated flanks have a clearance groove b, the form of which is left to the discretion of the manu- facturer. For the symmetry tolerance s of the clearance groove, see table
15、 2. DIN 103 Part 9 Page 3 Table 2. Values of b and FI for profiles with truncated flanks (in mm, see f.igures 3 and 4) Nominal size 0,6 0.85 1.25 3,1 3,6 4,05 1 14 4.5 5,4 6,35 7,25 8 2 9,15 10.1 1 1 ,O5 12,9 14,9 16.85 18,7 20,6 - I Limit f 0.1 r 0.1 t 0,l 1) P = pitch of single start trapezoidal t
16、hread. The limit deviations for b may be exceeded if the real displacement is less than the symmetry tolerances, by twice the amount of the difference between the symme- try tolerances and the real displacement. Figure 5. Symmetry tolerances of the clearance groove b Page 4 DIN 103 Part 9 Symbol TD,
17、 Td2 TR TCP 2 Tolerance zones 2.1 Tolerance zones for pitch diameter (see figures 6 and 7) Quantity Tolerance on the pitch diameter of the workpiece thread Tolerance on the pitch diameter of the Go screw ring gauge and the Not Go screw ring gauge Tolerance on the pitch diameter of (Go and Not Go) ch
18、eck plugs, wear check plugs and setting plugs TPL WGO WNG Tolerance on the pitch diameter of Go and Not Go screw plug gauges Average amount available for permissible wear on the Go screw plug gauge and Go screw ring gauge Average amount available for permissible wear on the Not Go screw plug gauge a
19、nd the Not Go screw ring gauge Distance of the centre of the tolerance zone of tolerance TR of the Go screw ring gauge from the upper limit of the workpiece ZR Distance between the centres of the tolerance zones of tolerance TR of the screw ring gauge and Tcp of the Go check plug Distance of the cen
20、tre of the tolerance zone of tolerance TL of the Go screw plug gauge from the lower limit of the workpiece thread m ZPL Wear check plug for solid Wear limit for solid GO screw ring gauge , Go screw ring gauge I I (Upper limit of workpiece) i - Solid Go screw ring gauge / Go check plug for new solid
21、Go screw ring gauge Setting plug for Go screw calliper gauge e“ Wear check plug for solid, Not Go screw ring gauge , Wear limit for solid Not Go screw ring gauge I Not Go Not Go Not Go (Lower limit of workpiece) Solid Not Go screw ring gauge , / / Go check plug for new solid Not Go screw ring gauge
22、Setting plug for Not Go screw calliper gauge 1 Figure 6. Tolerance zones for the pitch diameter of gauges for checking external threads DIN 103 Part 9 Page 5 Hl H2 The pitch diameter of screw ring gauges can be measured directly where it cannot be better checked with check plugs. In order to ensure
23、that a screw ring gauge that has been found to be correct by direct measurement will also be found correct when checked with a Go check plug, it is necessary to shift the pitch diameter tolerance zone of the Go check plug downwards by an amount m, in relation to the pitch diameter tolerance zone of
24、the screw ring gauge (see figure 61. The values specified in table 7 for m represent the sum of the diametral equivalents of the average errors that are likely to occur in the pitch and the flank angles of the check plug and of the screw ring gauge, in relation to the specified tolerances on these t
25、hread parameters. Tolerance for plug gauges Tolerance for calliper gauges and ring gauges Not Go (Upper limit of workpiece) - - Not Go screw plug gauge -7- / Wear limit for Not Go screw plug gauge Go screw plug gauge Wear limit of Go screw plug gauge Figure 7. Tolerance zones for the pitch diameter
26、of gauges for checking internal threads 2.2 Tolerance zones for plain gauges (see figures 8 and 9) Symbol Quantity I TDT I Tolerance on the minor diameter of the workpiece internal thread I Td I Tolerance on the major diameter of the workpiece external thread Distance of the centre of the tolerance
27、zone of tolerance HI of Go plug I “ 1 gauges from the lower limit of the workpiece thread Distance of the centre of the tolerance zone of toleranceH2 of Go calliper gauges or Go ring gauges from the upper limit of the workpiece thread 2 Tolerance zones for check gauges for calliper gauges shall be s
28、elected in accordance with DIN 7162. Page 6 DIN 103 Part 9 Wear limit for Go gauge Go Go reference gauge Go calliper gauge or Go ring gauge k Not Go calliper gauge or Not Go ring gauge Not Go reference gauge Figure 8. Tolerance zones for gauges for checking the major diameter of external threads Go
29、/ Not Go plug gauge Go plug gauge ho c (Lower limit of workpiece) Wear limit for Go plug gauge Figure 9. Tolerance zones for gauges for checking the minor diameter of internal threads 3 Calculation of gauge dimensions 3.1 Gauges for workpiece external threads In table 3 on pages 7 and 8 d, D, d, d,
30、and Di are nominal thread diameters; Td2 is the tolerance on the pitch diameter as specified in DIN 103 Part 3; A, is the fundamental deviation for the pitch diameter for the appropriate tolerance position as specified in DIN 103 Part 3. (Ao shall be inserted in the table 3 equations omitting the si
31、gn specified for the fundamental deviations. For tolerance position h, Ao = O) DIN 103 Part 9 Page 7 .c: II W N VI .- 6 E 5 .- ?i .c: II a N VI .- 5 I E .- X - a $lm +I $1- +I O + d ru I 9 I O N U fidb + d N I 1 I O UN E l N I 7 I d O N U E I ru I 1 I d O D ;1 fi“ +I $IN +I 4 fi“ +I Er; N + O cl is
32、the nominal thread diameter. The wear limit for Go gauges is the upper limit of size for the major diameter of the external thread. Deviation H2 +2 H2 2 Thread Type of profile as in figure gauge 1 Go screw Plug gauge Not Go screw 5 Plug gauge In table 5 d3,d,D, andD2 are the nominal thread diameters
33、; TD2 is the tolerance on the pitch,diameter of the thread as specified in DIN 103 Part 3. The wear dimension for the pitch diameter of the Go screw plug gauge is D, +A, +ZpL - WGo. The wear dimension for the pitch diameter of the Not Go screw plug gauge is D, +A, -t TD2 WNG -t 2. TPL Dimensions of
34、gauge thread Major diameter Pitch diameter Minor diameter or clearing Required size Deviation Required size Deviation diameter T Maximum d +ZPL + TPL D, ZPL 7 size= d3 Maximum D, t TD2 +-+ 2 Fi ?I TpL D2 + D2 2 clearance groove b TPL size = d3 with TPL TPL 2 Type of gauge Required size Deviation D,
35、+z, Go plug gauge In table 6 TD is the tolerance on the minor diameter of the thread as specified in DIN 103 Part 3; D1 is the nominal thread diameter. The wear limit for the Go plug gauge ist the lower limit for the minor diameter of the internal thread. Hl 2 Dl +TD1 Not Go plug gauge Hl *2 Page 10
36、 DIN 103 Part 9 Tolerance on workpiece thread Over up to Td2 Or TD TR TPL TCP m ZR ZPL 80 125 20 13 12 19 3 9 125 200 26 16 13 22 12 17 200 315 33 20 17 28 17 23 - 31 5 500 42 26 22 35 29 35 500 800 54 32 26 43 40 46 800 1180 66 38 30 51 48 54 1180 1700 80 48 38 62 58 64 1700 2400 96 58 46 74 70 76
37、- TR -+ TCP 1) m has been calculated from - t 3. 2 In order to limit the number of Go gauges for one and the same size of screw thread, the following is recom- mended. For workpiece threads with a tolerance of the seventh grade or coarser, the values in table 7 for grade 6 can be selected. However,
38、the use of only one Go gauge should be restricted to cases where it provides an economic advantage. In table 9 a, is the flank angle of the profile with complete flanks; is the flank angle of the profile with truncated flanks. Table 8. Values of WGO and WNG for screw gauges (in cim) Tolerance on Td2
39、 Or TD 500 800 39 I I I I I 1180 1700 90 68 72 49 1700 1 2400 1 108 I 81 I 87 I 60, I I I I l - Table 9. Limit deviations for the flank angle (values are given in minutes) I ; i :; 1 :9 7 +9 +7 +9 20 7 +9 I 44 I 16 I +-8 I 1) P = pitch of single start trapezoidal thread. DIN 103 Part 9 Page 11 5 Tab
40、le 1 O. Pitch tolerances Tp (in pm) 6 7 8 10 TP 140 335 850 9 50 1120 I for gauges of thread lengths, in mm, 335 850 950 1120 1400 upto32 Over 32 Over 50 Over 80 Over I I upto50 I upto80 uptol20 I I 1 I I I The pitch tolerance Sp applies to any number of turns lying within the thread length of the g
41、auge. The measured deviation may be in either the plus or minus direction. For a double-length setting plug, the thread length used for determining the pitch deviation is half the overall thread length of the setting plug. The pitch tolerance is the maximum permissible deviation between any two turn
42、s within half the overall thread length of the setting Plug. Table 11. Tolerances and deviations for gauges for the major diameter of an external thread (values are given in pm) Tolerance Td on major diameter Over I pto Table 12. Tolerances and deviations for gauges for the minor diameter of an ihte
43、rnal thread (values are given in pm) Tolerance TD on the minor diameter Over I Upto I 1250 1250 1600 1600 2000 5 General design features of screw gauges All gauges shall as far as possible be made in accordance with the Taylor principle. This applies not only to gauges for checking workpiece threads
44、 but also to gauges intended for checking or setting such gauges. Exceptions are only permissible where they can be justified. Note. The Taylor principle states that in a Go gauge, the limits of size for “maximum material“ should comprise as many individual elements as possible of the geometrical bo
45、dy being inspected, so that the gauge checks the overall effect of the indi- vidual elements against the Go limit. The Not Go limit, representing the limits of size for “minimum material“ shall be checked on each individual element separately with specific Not Go gauges. 5.1 Gauges for workpiece bol
46、t threads 5.1 .I Solid Go screw ring gauge The length of thread on the Go screw ring gauge shall be at least 80% of the length of engagement of the work- piece thread (internal thread length). 5.1.2 Go screw calliper gauge If the design of the Go screw calliper gauge so permits, the length of the an
47、vils should be 80% of the length of engagement of the workpiece thread (internal thread length). 5.1.3 Setting plug for Go screw calliper gauge The length of thread on the Go screw ring gauge shall be at least 80% of the length of engagement of the work- piece thread (internal thread length). 5.1.4
48、Not Go screw calliper gauge Each anvil of the Not Go screw calliper gauge shall be designed so that it contacts the workpiece thread on not more than flanks (see figure 10a or b). I I I l I l Thread shown in centre line section a b Figure IO. Anvils for Not Go screw calliper gauges 5.1.5 Solid Not G
49、o screw ring gauge This gauge shall have a thread length of at least three complete turnsn). 5.2 Gauges for workpiece internal threads 5.2.1 Go screw plug gauge The length of thread on the Go screw plug gauge shall not be less than 80% of the length of engagement of the workpiece thread (internal thread length). 5.2.2 Not Go screw plug gauge The Not Go screw plug gauge shall have a thread length of at least three turns 2). 2) Complete turns of the tread are counted. Page 12 DIN 103 Part 9 5.3 Start of thread Even in cases wh
