UDC 621.882.31 : 621.882.55 May 1987 Prevailing torque type hexagon nuts with nonmetallic insert Sechskantmuttern mit Klemmt Supersedes September 1977 edition ‘mit nichtmetallischom Einsatz, hohe Form withdrawn in 1983, In keeping with current practice in standards published by the International Organization for Standardization (ISO), ‘a comma has been used throughout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. Dimensions in mm. 1 Field of application ‘This standard specifies requirements for M § to M 24 prevailing torque type hexagon nuts with nonmetallic insert, assigned to product grade A for sizes up to M 16 and product grade B for sizes over M 16. If, in special cases, nuts are to comply with specifications other than those given in this, standard, e.g. regarding materials other than those specified in DIN 267 Part 15, performance at temperatures above + 120°C, or corrosion resistance, this shall be agreed at the time of ordering (cf. DIN 267 Part 15) 2. Dimensions Prevailing torque element (design at the manufacturer's 45° © discretion) wo ‘minimum wrenching height. Continued on pages 2 to 4 140Page 2 DIN 982 r we[we]wr [we [wo [walwi|ww| mie] wa [wa | was ae TP we Pwrio fwrie fwrie [wae | wie | wa0 | wan | was ven size MENT TSE | tas] eas S| Se | Se [Ne Se cea esas ansat| een ea lvoe ant eat 1 125| «125 es | 18 | x18 Py Neon aliens a |igs [eet e | ass eee eer lie 2 259 28 267 | veo | iar | 202 V9 1382 | 1448 | 16.16 8 | 1 | o [2 | 36 nn 778 | 978 | 1079 | 1273 | 1673 | reer | aver | 2967 | 2616 a 35 2) Also minimum thread length. 1) P= pitch of coarse thread as specified in DIN 13 Part 12. 3 Technical delivery conditions Material General requirements ‘As specified in DIN 267 Parts 1 and 15. Tolerance 6H") Thread ee i As specified in DIN 13 Parts 12 and 16. ea Property class 5, 62), 8 or 10; properties (material) 12 (only for sizes up to M 16). {nut body) 150 898 Part 2 and DIN 267 Part 15. Material (insert) Nonmetallic, e.g. polyamide Performance (pre Limit deviations and For sizes up to M 16: A (previously, design rm). For sizes over M 16: B (previously, design mg). geometrical tolerances 1S0 4759 Part 1. Surface finish ‘As processed. DIN 267 Part 2 shall apply with regard to surface roughness. DIN 267 Part 20 shall apply with regard to permissible surface discontinuities. DIN 267 Part 9 shall apply with regard to electroplating. ‘Acceptance inspection DIN 267 Part 5 shall apply with regard to acceptance inspection. 1) See DIN 267 Part 15 in this respect. 2) Only for fine thread nuts. 141DIN 982 Page 3 4 Mass ‘The values of mass are given for guidance only. ‘Thread size ms | Me] M7 T Mass (7,85 kg/dm3) for ] | T00 UereE In a= 14 | 31 | 32 | 6 | 117 | 166] 21 | 978 | 516 | 68 | 86 | 127 wiz] mia] M16 | M13 | M20 | M22 | M24 Approximately the same values may be assumed for fine thread nuts. 5 Designation Designation of an M 12 prevailing torque type hexagon nut with @ nonmetallic inser, assigned to property class 8: Hexagon nut DIN 982 — M 12-8 If nuts of sizes over M 16 are to comply with product grade A (as specified in ISO 4759 Part 1), this shall be indicated in the designation by adding ‘A’, e.g Hexagon nut DIN 982 — M20 ‘The DIN 4000 ~ 2 -- 7 tabular layout of article characteristics shall apply for nuts covered in this standard, -A 6 Marking Nuts shall be marked in accordance with the specifications of OIN 267 Part 15. Note for users Tolerance class 6H shall apply for the thread of nuts with and without coating. Where a protective coating is applied, e.g. an electroplated coating complying with DIN 267 Part 9, depending on the coating thickness required, it may be necessary to select a larger fundamental deviation than that assigned to the H position (see DIN 267 Part 9), This, however, might impair the resistance of the bolt/nut assembly to stripping. 142Page 4 DIN 982 Standards referred to DIN 13Part 12 1SO metric screw threads; coarse and fine pitch threads from 1 to 300 mm diameter; selected diameters and pitches DIN 13Part 15 ISO metric screw threads; fundamental de and larger DIN 267 Part 1 Fasteners; technical delivery conditions; general requirements DIN 267 Part 2 Fasteners; technical delivery conditions; types of finish and dimensional accuracy DIN 267Part5 Fasteners; technical delivery conditions; acceptance inspection (modified version of ISO 3269, 1984 edition) DIN 267Part9 Fasteners; technical delivery conditions; electroplated components, DIN 267 Part 15 Fasteners; technical delivery conditions; prevailing torque type nuts DIN 267 Part 20 Fasteners; technical delivery conditions; surface discontinuities on nuts DIN 4000 Part 2 Tabular layout of article characteristics for bolts, screws and nuts ISO 898 Part 2 Mechanical propertias of fasteners; nuts with specified proof load values 1S0 4759 Part 1. Tolerances for fasteners; bolts, screws and nuts with thread diameters >1,6 and <150 mm and product grades A, B and C Wns and tolerances for screw threads of 1 mm diameter Previous editions DIN 982: 12.67, 09.77. Amendments ‘The following amendments have been made to the September 1977 edition, which was withdrawn in 1983. 2) The title of the standard has been amended. 'b) Because of the higher proof load values specified in ISO 898 Part 2, the dimensions m and m’ have been harmonized with DIN 6926. ) For sizes over M 16, product grade B has been specified instead of product grade A. 4d) The dimensioning has been amended; limit deviations calculated from the permissible tolerances have been added, ) The technical delivery conditions have been expanded Explanatory notes ‘The previous edition of DIN 982 was withdrawn in 1983, since it was proposed that it should be superseded by DIN 6924 in the course of the changeover to the new widths across flats. This seemed sensible as the dimensions of the nuts covered in DIN 982 were the same as those specified in DIN 6924, except for the widths across flats for sizes M 10, M12, M14 and M 22, As DIN 6924 had already been harmonized with 1SO 7040, it included the widths across flats specified in 180 272. However, following the withdrawal of DIN 982 it became clear that the nuts with the old widths across flats were still Used and a changeover to the widths across flats specified in ISO 272 would not be possible at short notice. It was therefore decided to republish DIN 982 in a revised form. Itis planned to adopt the widths across flats specitied in ISO 272 in the near future. Although DIN 6924 already includes thse widths across flats and corresponds to ISO 7040 in respect of the dimensions, DIN 6924 will probably not supersede DIN 982, as it does not as yet reflect in all respects current thinking on the next generation of prevailing torque type nuts and a changeover in a number of stages should be avoided where possible. This next generation should satisfy the following requirements 2) the nuts should be interchangeable with the corresponding products complying with 1SO 7040; b) it should be possible to use the nuts on automatic feed and bolting equipment. Germany will propose in ISO/TC 2 to introduce adequate tolerances for the nut height, in order that requirement b) above can be satisfied, and additionally propose the inclusion of nuts with fine pitch thread. The decision as to whether Germany will adopt {SO 7040 without amendment or in a modified form will depend on the result of the discussions in ISO/TC 2 International Patent Classi F168 39/28 143