1、Wire thread inserts for IS0 metric screw threads Part 1 : Dimensions and technical delivery conditions ICs 21.060.99 DIN - 8140-1 Supersedes October 1988 edition. Gewindeeinstze aus Draht fr Metrisches ISO-Gewinde - Teil 1 : Mae, Technische Lieferbedingungen In keeping with current practice in stand
2、ards published by the International Organization for Standardization (ISO), a comma has been used throughout as the decimal marker. Foreword This standard has been prepared by Technical Committee Gewindeeinsatze of the Normenausschuss Mechanische Verbindungselemente (Fasteners Standards Committee).
3、Amendments This standard differs from the October 1988 edition in that it has been editorially revised and the specifica- tions for d, and the number of turns for sizes M14 and M16 have been harmonized with international standards. Previous edition DIN 81 40-1 : 1988-1 O. All dimensions are in mm. 1
4、 Scope This standard specifies dimensions and technical delivery conditionsfor wire thread inserts (thread inserts, for short) which serve to produce high-strength, wear-resistant internal screw threads in metallic and non- metallic components. They are also used to repair damaged threads and to rep
5、lace threads worn in service. Thread inserts reduce the susceptibility of bolted connections to cold welding. They are resistant to the effects of high and low temperatures and to corrosion and ensure a constant coefficient of friction. 2 Normative references This standard incorporates, by dated or
6、undated reference, 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
7、 when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. Continued on pages 2 to 13. Translation by DIN-Sprachendienst. In case of doubt, the German-language original should be consulted as the authoritative text. No pari o
8、f this translation may be reproduced without the prior permission of Ref. No. DIN 8140-1 : 1999-0 hl Deutsches Institut fr Normung e. V., Berlin. Luth Verlag GmbH, D-10772 Berlin, hac the exclusive right of sale for German Standards (DIN-Normen). English price group O9 Sales No. 0109 06.00 Page 2 DI
9、N 8140-1 : 1999-07 DIN 13-1 DIN 13-3 DIN 267-2 DIN 962 DIN 81 40-2 DIN EN 28839 DIN EN IS0 898-1 DIN EN IS0 2320 DIN EN IS0 3506-2 DIN IS0 965-1 IS0 641 0-2 : 1993 BS 4377 : 1991 General purpose IS0 metric screw threads - Part 1 : Nominal sizes for 1 mm to 68 mm diameter coarse pitch threads General
10、 purpose IS0 metric screw threads - Part 3: Nominal sizes for 0,5 mm fine pitch threads with diameters from 3,5 mm to 90 mm Fasteners - Technical delivery conditions - General requirements Designation system for fasteners Wire thread inserts for IS0 metric screw threads -Tapped holes for thread inse
11、rts and thread to1 erances Mechanical properties of fasteners - Bolts, screws, studs and nuts made of non-ferrous metals (IS0 8839 : 1986) Mechanical properties of fasteners made of carbon steel and alloy steel - Part 1 : Bolts, screws and studs (ISO/DIS 898-1 : 1996)*) Prevailing torque type steel
12、hexagon nuts - Mechanical and performance properties (IS0 2320 : 1997) Mechanical properties of corrosion-resistant stainless steel fasteners - Part 2: Nuts General purpose IS0 metric screw threads - Tolerances - Part 1 : Principles and basic data (IS0 965-1 : 1998) Technical drawings - Screw thread
13、s and threaded parts - Part 2: Thread inserts Specification for tapping of holes to receive wire thread inserts (IS0 metric threads) (IS0 3506-2 : 1997) 3 Types and dimensions Thread inserts shall be made from rhombic wire to form a spring-type helical coil. They are classified into type A inserts,
14、for M2 to M39 and M8 x 1 to M39 x 3 screw threads (cf. figure l), and type B inserts, with the internal cross section taking the form of a centric polygon and with a locking function, for M2,5 to M24 and M8 x 1 to M33 x 2 screw threads (cf. figure 2). NOTE: Locking is achieved by an increased fricti
15、onal contact in the thread, preventing the bolt in the connec- Thread inserts shall be provided with a notch (as shown in figures 1 and 2) permitting removal of the tang after fitting. tion from working loose, this resulting in an increased torque when screwing in the bolt. 1 1 2 1 Notch 2 Tang Figu
16、re 1 : Type A thread insert 2 1 Notch 2 Tang Figure 2: Type B thread insert, with locking function 3.1 Nominal length The recommended nominal length of a thread insert is a function of the workpiece material, and the property class of the bolt or the yield strength of the bolt material (cf. table 1)
17、. *) At present at draft stage. Page 3 DIN 8140-1 : 1999-07 Table 1: Nominal length (guideline values) I I I I I I i: 11 1 Thread to DIN 8140-2 Figure 3: Thread insert Figure 4: Tapped hole Figure 5: Assembly Key to symbols: d thread size (nominal diameter) d, major diameter of thread insert before
18、assembly d, minor diameter of tapped hole (guideline value) 1, nominal length of thread insert (design value) 1, length of thread insert when fitted (1, - P) 1, minimum depth of core hole 1, minimum length of tapped hole for blind holes and clearance holes (1, = 1, + P) 1, distance of thread insert
19、from workpiece surface (0,25 P to 0,75 P) 1, maximum length of engagement with tang not removed P pitch Page 4 DIN 8140-1 : 1999-07 3.2 Coarse pitch threads Table 2: Dimensions for inserts, core holes and tapped holes (with recommended thread sizes) - Core hole Thread insert Tapped hole to DIN 8140-
20、2 rhread size 4 Assembled length: rhreac size, d - M2 Number turns I dl I, 2) of d, 3 13 Min. I I Min. I Max. 2,1 I 4,3 I 5.3 6,3 4,4 2,05 3,3 4,55 4,3 M2,5 - M3 - M4 - M5 3,5 M2,5 3,75 2d 2,5d 6,25 10,5 1 d I 3 1 3,9 1 3,8 1,5 d 4,5 63 2d 6 8,7 2,5 d 73 11) Id 4 3,7 5,15 3-3 I 3 93 11,8 2,5d 10 10,
21、9 Id 5 4,3 6,35 1,5 d 75 63 2d 10 9,7 2,5 d 12,5 12,3 Id 6 42 7,6 13,8 92 y 12,5 11,7 14,2 16,7 7,85 - 113 14,l 8 1 -7.5 1 7J 20J 12 15 See page 6 for I), 2, and 3). (continued) Page 5 DIN 8140-1 : 1999-07 Thread size 4 EG 8 M8 12 Table 2 (continued) I2 I6 IS 6,75 6,2 0,3 to 10,75 10,2 099 Tapped ho
22、le Assembled lengths to DIN 8140-2 P I, 2 1,25 1 d 8 1,5d 12 Thread insert Number of turns I) 4,7 7,4 Core hole 1,5 -hreai size, d - M8 - M10 2d 16 l 0,6 2,5d 20 13,5 1 d 10 5 1,5d 15 8,l 2d 20 11,2 1,75 2,5 d 25 14,2 1 d 12 52 1,5d 18 8,4 2d 24 11,7 2,5d 30 14,7 EG M16 24 22,25 21,4 30 28,25 27,4 1
23、6 14 13,l 0,5 . to 24 22 21) 1-5 EG M20 32 30 29,l 40 38 37) 20 17,5 16,3 0,6 to 30 27,5 26,3 1,9 40 37,5 36,3 dZ3 - 8,4 10,5 12,5 16,5 13 Min. 14,2 18,2 22,2 26,2 17,3 - Max. 10,l - - 12,5 Min. 9,85 - - 12,l - 14,4 I I I 22,3 27,3 32,3 20,3 L I I M12 14,8 26,3 I l 32,3 38,3 25,3 Mi6 - M20 - M24 19.
24、0 19,4 33,3 41,3 I l I f 13,8 17,5 49,3 23,7 - 28,6 24.2 20,75 31,2 41,2 51,2 29) - 35,7 - 24,75 3 7) EG M24 49,l 61,l M30 35,2 - EG M30 31 45,2 60,2 75,2 See page 6 for I), 2, and 3). (continued) Page 6 DIN 8140-1 : 1999-07 Tapped hole to DIN 8140-2 Table 2 (concluded) I Assembled lengths rhreac si
25、ze, d - M36 Thread size I4 EG 36 M36 54 72 P I2 l6 IS 32 30s 1 to 50 48,1 3 68 66s 4 - Il 2 I Thread insert Number of turns) Min. 42,l - Min. 88,8 I) The number of turns may be reduced by 0,25. 2, As 1, cannot be measured in the as-delivered condition, the acceptance criteria shall be dl and the 3)
26、Recommended diameter of twist drill. number of turns. Page 7 DIN 8140-1 : 1999-07 Table 3: Dimensions for inserts, core holes and tapped holes (with thread sizes not recommended) Tapped h o1 e to DIN 8140-2 Assembled lengths Thread insert Core hole rhrea size, d - M3,5 - M7 - M 14 Number Min. P - 0,
27、6 - 1 - 2 3,7 6,9 EG 8,65 10,4 12,15 7,3 12,l EG M7 15,6 19J 22,6 14,5 23,3 EG MI4 30,3 37,3 44,3 M3,5 7 8,75 7 2,5d 8,75 11,2 8,65 10,5 14 17,5 14 21 28 35 18 27 36 45 M 18 - M22 - M27 - M33 - M39 - 22 47,2 56,2 22,75 33,2 EG M22 44s 55,2 27,75 40,l EG M27 53,6 671 26,8 - 32,7 - 38,8 - 45,6 - 22 33
28、 44 27 Id 32,2 40,5 + 1,5d 49,5 12,2 54 33 493 34 r23 66 39 58,5 78 - *i 45,1 16,6 See page 6 for I), 2, and 3). Page 8 DIN 8140-1 : 1999-07 12 3.3 Fine pitch threads I5 Max. Table 4: Dimensions for inserts, core holes and tapped holes (with recommended thread sizes) Thread size, d M8xl M10xl Tapped
29、 h o1 e to DIN 8140-2 Core hole Number of turns I) I, 2) Id 8 6,1 1,5d 12 9s 2d 16 12,9 2,5d 20 16,5 Id 10 76 Thread insert l3 Min. Assembled lengths Thread size 13,l 1 7) 21J 25,l 15,l 20,l 25,l 30,l 16,2 21,2 26,2 EGM8xl EGM10.1 EG MIO x 1,25 15 19 9 14 19 24 8,75 13,75 18,75 14,5 18,5 8,5 0.3 to
30、13,5 0,8 18,5 23.5 8,2 0,3 to 13,2 0,9 18,2 MlOx1,25 1,5d 15 12,l 2d 20 16,3 2,5d 25 20,7 1 d 10 6 M12xl 1,5d 15 9,7 2d 20 13,l Id 12 9,3 1,5d 18 14,5 18,2 24,2 30,2 19,3 25,3 31,3 37.3 EG M12 x 1,25 EG MI2 x 1,5 M12x1,5 1,5 d 18 11,6 2d 24 15,9 1 d 12 62 13 d 18 93 2d 24 13,5 M16x1,5 1 d 16 8,7 2d
31、32 18,l 2,5 d 40 22,9 dl 14 Min. Max. Min. 9,85 - 12,l - 12,l 10,l - 12,5 - 12.5 83 - 10,3 - 10.4 8 12 16 20 10 - 15 20 25 10 - - - 15 20 12 - 14,4 14,8 12,3 18 I 2d I 24 I 19,5 24 M12x1,25 I 1 d I 12 I 7,4 14,4 - 14,4 14,8 - 14,8 12,4 - 12,5 12 18 - 24 12 - 18 24 - 16,5 15,8 22,5 21,8 30 I 2,5 d I
32、30 I 15,7 19.0 19,4 16.5 EGM16x15 16 I I I I 1,5 d I 24 I 13,4 24 22,5 30,5 29,8 38,5 37,8 I I I 32 40 - (continued) Page 9 DIN 8140-1 : 1999-07 Max. Min. Min. Max. 24,2 20,5 27,3 EG M20 x1,5 20 18,5 17,8 0.4 24,2 20,5 29,3 EG M20 x 2 20 18 17,l 0,5 to 30 28 27) 1,5 39,3 43,3 42,6 36,5 45,3 EG M36 x
33、 2 36 34 33) 0,5 to 63,3 54 52 51,l 1,5 42,6 37 49,l EG M36 x 3 36 33 31,6 0,8 to 67) 54 51 49,6 293 Page 1 O DIN 8140-1 : 1999-07 Tapped hole 1 Ore hole 1 to DIN 8140-2 Table 5: Dimensions for inserts, core holes and tapped holes (with thread sizes not recommended) I I i Assembled lengths Thread in
34、sert dl Number of turns) Min. Max. I, 2 - 14,4 9,4 16,8 17,2 - 16,4 10,6 d2 3, 14 12 lh I5 Thread size Min. Min. Max. 14,25 - EG M14 x 1,25 14,4 13,2 - 0,3 to - 16,4 15,2 - 0,g Thread size, d Ml44 1,25 M14 x 1,5 M18 x 1,5 4) M18 x 1,5 M18 x 2 M22 x 1,5 M22 x 2 M33 x 2 M39 x 2 M39 x 3 :l 1 19 1 11.3
35、1 45J 1 45,6 1 3: 1,5 d 58,5 10,8 45,l 45,6 1,5d 58,5 16,8 21,3 I EG M14 x 1,5 I 14 1 12,5 I 11,5 I 0,4 35,3 28 26,5 25,8 42,3 35 333 32,8 19,3 EG Mi8 x 1,5 EG M18 x 1,5 1 45 I 433 I 42,8 I 18 16,5 15,8 0,4 to 27 25,5 24,8 1,1 36 343 33,8 29,3 40,3 EGM18x2 18 16 15,l 0,5 to 1,5 27 25 24,l 36 34 33,l
36、 45 43 42,l EG M22 x 1,5 22 20,5 19,8 0,4 to 33 31,5 30,8 1,1 31,3 1 EG M22x 2 1 : I t: 1 19,l 1 0,5 to 42,3 3071 1,5 53,3 44 42 41,l 48,s 1 EGM39x2 1 39 1 1: 1 36,l 1 678 58,5 56,5 55,6 52,l EGM39x3 39 34,6 0,8 71,6 583 55,5 54,l 2,3 See page 6 for I), 2, and 3). l) Thread for spark plugs. Page 11
37、DIN 8140-1 : 1999-07 4 Technical delivery conditions 4.1 Materials Thread inserts shall be made of work-hardened grade A2 austenitic steel with a Vickers hardness from 425 HV 02 to 550 HV 0,2 as specified in DIN EN IS0 3506-2 or of work-hardened CuSn6 alloy with a minimum Vickers hardness of 260 HV
38、0,2 as specified in DIN EN 28839. For applications in a highly corrosive environment, work-hardened grade A4 austenitic steel with a Vickers hardness from 425 HV 02 to 550 HV 0,2 as specified in DIN EN IS0 3506-2 shall be used. 4.2 Surface roughness For the surface roughness of thread flanks, the sp
39、ecifications for rolled screw threads given in DIN 267-2 shall apply. 4.3 Axial proof load Thread inserts with a nominal length as specified in table 1 shall have a design proof load equal to the minimum breaking load specified in DIN EN IS0 898-1 *). 4.4 Prevailing torque The prevailing torque shal
40、l be as specified in DIN EN IS0 2320. 4.5 Test temperature Testing shall be carried out at ambient temperature. 4.6 Finish The surface of thread inserts shall be bright, except for type B inserts, where it shall be red. 5 Designation Designation of a thread insert of type A, for thread size M6, made
41、 of grade A2 steel and with a nominal length, Z, of 12 mm: Thread insert DIN 8140 - A M6 x 12 - A2 If thread inserts are to be supplied with left-hand thread, the symbol LH shall be included in the designation (cf. DIN 962). EXAM P LE: Thread insert DIN 8140 - A M6 LH x 12 - A2 6 Service temperature
42、s Thread inserts as specified in this standard are designed for use at temperatures in the range from -40 “C to +300 “C. 7 User information 7.1 Core hole Core hole diameters (d2) are given in tables 2,3,4 and 5. The core holes should not be countersunk, since tapped holes without countersink facilit
43、ate the introduction of the thread inserts. Where countersinking is indispensable (e.g. in the case of sealing faces that cannot be finished), the maximum countersink diameter shall be equal to the major diameter of the tapped hole. 7.2 Tapped hole The dimensions and limits of size of the tapped hol
44、e shall be as specified in DIN 81 40-2. For the manufacture and gauging of tapped holes, special screwing taps and plug gauges shall be used. 7.3 Internal thread The internal thread provided by the thread insert shall have class 6H tolerances. Special tools are required for introducing the thread in
45、sert. For *), see page 2. 5, No prevailing torque has been specified for coarse pitch threads of sizes M2, M2,5 and M3,5 and fine pitch threads of sizes M12 x 1, M14 x 1,25, M24 x 13, M26 x 13, M30 x 13, M36 x 2, and M39 x 2. Page 12 DIN 8140-1 : 1999-07 8 Indication on drawings 8.1 Tapped holes The
46、 tapped hole shall be indicated on the drawing by the DIN number and a symbol, as specified in figure 6. 1 1 1 Tapped hole DIN 8140 - EG M10 Figure 6: DIN 8140 - A M10 x 15 - A2 tapped hole for thread insert (example) 8.2 Thread insert assembly The thread insert shall be indicated on the drawing by
47、the DIN number and a symbol, as specified in figure 7. Unless otherwise indicated on the drawing, the tang shall be removed after assembly. If the tang is not to be removed after assembly, the letter M shall be added to the designation. EXAMPLE: DIN 8140 -A MlOx 15 -A2 - M 1 1 1 DIN 81 40 - A M1 O x
48、 1 5 - A2 a O,4 to 1,1 Figure 7: DIN 8140 - A M10 x 15 - A2 thread insert assembly (example) 8.3 Assembly drawing Figure 8: Thread insert/bolt assembly Page 13 DIN 8140-1 : 1999-07 Explanatory notes DIN 8140-1 and DIN 8140-2 have been prepared on the basis of standards published in other countries (
49、e.g. British Standard BS 4377), standards issued by the Normenstelle Luftfahrt (Aerospace Standards Com- mittee), and works standards of a number of German manufacturers, the aim being to harmonize the specifi- cations for tapped holes, the associated tolerances, and the product specifications for thread inserts. Users of this standard should note the following. a) Tolerance class 6H as specified here is the tolerance class for the thread insert after assembly. However, in DIN 8140-2, the tolerance class for the pitch diameter of the tapped hole has been denoted as 6
