1、UDC 621.882.33 DEUTSCHE NORM Januarv 1994 Thread size (d) P) DIN - Product grade C square nuts 557 M5 M6 M8 M10 M12 M16 03 I 1,25 195 1.75 2 Vierkantmuttern; Produktklasse C Supersedes February 1985 edition. 4, min. max. min. e In keeping with current practice in standards published by the Internati
2、onal Organization for Standardization (ISO), a comma has been used throughout as the decimal marker: 6,7 8,7 11,5 14,5 15,5 16,5 17,2 22 11,3 14,l 18,4 22,6 24 25,4 26,9 33,9 9,93 12,53 16,34 20,24 21,54 22,84 24,02 30,ll The new widths across flats 16 mm and 18 mm as specified in IS0 272 shall be u
3、sed instead of the previous widths across flats 17 mm and 19 mm for thread sizes M 10 and M 12; see clause 4 for example of designation. It is intended to omit the obsolescent widths across flats by 1 January 1999 at the latest. Dimensions in mm 1 Scope and field of application This standard specifi
4、es requirements for M 10 to M 12 square nuts assigned to product grade C. See DIN 962 (or the standards referred to therein) for special nut types or finishes. If, in special cases, nuts are to comply with specifications other than those given in this standard (e.g. regarding property class or mater
5、ial), these shall be selected in accordance with the relevant standards. 2 Dimensions , ) P=Pitch of thread (coarse pitch thread). *) Approximate value, with =7,85 kg/dm3. Continued on pages 2 and 3 Beufh Verlag GmbH, Berlin, has the exclusive right of sale for German Standards (DIN-Normen). 08.94 D
6、IN 557 Engl. Price group 5 Sales No. 0105 Page2 DIN557 Tolerance As specified in 3 Technical delivery conditions Table 2 7H DIN 13 Part 15. I Steel I Material I Property class Mechanical properties As specified in I General requirements I As specified in IS0 8992. I 5 DIN EN 20898 Part 2. Thread Pro
7、duct grade Limit deviations and geometrical tolerances As specified in C IS0 4759-1. I I 1 Surface finish As processed. IS0 4042 shall apply with regard to electroplating. DIN 267 Part 1 O shall apply with regard to hot dip galvanizing. I Acceptance inspection I IS0 3269 shall apply with regard to a
8、cceptance inspection. I 4 Designation Designation of an M 8 square nut: Square nut DIN 557 - M 8 When this designation is used, it should be noted that where MIO and MI2 threads are specified, the previous widths across flats of 17 mm and 19 mm, respectively, are meant. If it is required that M 10 a
9、nd M 12 nuts be sup- plied with the new widths across flats (16 mm and 18 mm), then these widths (SW) are to be incorporated in the des- ignation, e.g.: Square nut DIN 557-M 12-SW 18 The DIN 4000-2-7 tabular layout of article characteristics shall apply to nuts as covered in this standard. DIN557 Pa
10、ge3 Standards referred to DIN 13 Part 15 DIN 267 Part 1 O DIN 962 DIN 4000 Part 2 DIN EN 20 898 Part 2 IS0 272 : 1982 IS0 3269 : 1988 IS0 4042 : 1989 IS0 4759-1 : 1978 IS0 8992 : 1986 IS0 metric screw threads; fundamental deviations and tolerances for screw threads of 1 mm diameter and larger Fasten
11、ers; technical delivery conditions; hot-dip galvanized components Designation system for fasteners Tabular layouts of article characteristics for screws and nuts Mechanical properties of fasteners; nuts with specified proof load values, fine pitch thread Fasteners; hexagon products; widths across fl
12、ats Fasteners; acceptance inspection Threaded components; electroplated coatings Tolerances for fasteners; bolts, screws and nuts with thread diameters from 1,6 to 150 mm product grades A, B and C Fasteners; general requirements for bolts, screws, studs and nuts Previous editions DIN 557 Part 1 : 01
13、.41x, 03.63; DIN 557: 04.23,04.25,07.36,05.70, 12.72,02.85. Amendments The following amendments have been made to the February 1985 edition. a) A note on the period of validity of some of the specifications of this standard has been included. b) M 20 nuts are no longer specified. c) For the nut heig
14、ht, rn, tolerance h15 has been specified. d) Different minimum values have been specified for the wrenching height, m, (previously, m). e) Minimum values of e have been specified. f) DIN EN 20 898 Part 2 shall apply with regard to mechanical properties. g) The standard has been editorially revised. International Patent Classification F 16 B 037/00
