Sechaantmuttern : Metrlaches Regel-und Felnewlnde ;

Produktkasssen  A und B                               Supersedes July 1982 Edition

In keeping with current Practice in standards publlshed by the international Organization for Standardization (ISO), a comma has benn used throughout as the decimal marker.

This standard should be used together width ISO 4032, ISO8673, and ISO 8674, For detalls, see Explanatory notes . It is Intended to withdraw the present standard by 1 July 1992 at the lastest.

Since the revised property classes as covered in ISO 898 Part 2 Can only be applied to hexagon nuts Complying width the Pressent standard for sizes between M5 and M39 in conjunction width the proofloads hitherto specified in DIN 267 Part 4, it is recommended that only hexagon nuts complying width ISO 4032( coarse pitch thread ) or ISO 8673 and ISO 8674 ( fine  pitch thread ) be used, the corresponding proofloads being specified In ISO 898 Part 2 and DIN 267 Part 23. To Distibguish between types of nut, the symbol identifying nuts as complying width the present Standard nuts will in future have to be amended by the code number denoting the property class being set off by two permanent vertical lines, e.g.| 8 | ( see  DIN 267 Part 4).

                              Dimensions in mm

1. Field of application

   This standard specifies requirements for M1 to M160 hexagon nuts , assigned to Products grade A( up to size M16 ) Or product grade B( for sizes above M16). If , in special cases, nuts are to comply width specifications ther than those given in this standard , e,g. regarding property class, they shall be seleted in accordance with the relevant standards.

2.Dimensions

4. Designation

 Designation of an M12 chamfered hexagon nut asslgned to property class 8 :

                        Hexgaon nut DIN 943 – M12 – 8

 If product grade A is requlred for size M16 or more, the product grade shall be include in the designation , e.g. :

              Hexagon nut Din 934 – M20 – B – A

If hexagon nuts shall be supplied with radiused edged( Gr), the designation shall read :

              Hexagon nut DIN 934 – M 110 × 6 – 8 – Gr

Hexagon nuts as specifled in this standard may be supplied in free cutting steel if in the order details, sumbol AU has been added to the symbol denoting the property class, e.g. :

               Hexagon nut DIN 934- M12 – 6 AU

DIN 962 shall apply with regard to designation of designs and types, with additional details to be given when ordering.

The DIN 4000-2-7 tabular layput of article characteristics shall apply for nuts covered in this standard.

5. Mass

 The values of mass given for steel nuts are for guidance only.

Approximately the same values of mass may be assumed for fine pitch nuts.

6. Marking

The specifications given in DIN 267 Parts 4, 11 and 18 shall apply for the marking of nuts.

 Nuts manufacured by machining, of property classes above 6 as specified in DIN 267 Part 4. shall only be marked subject to particular agreement.

Appendix A

 Addditional thread sizes for spare parts

 The previous thread sizes M1,7 M2, 3 and M2. 6 which are not included in the international selection of screw threads for bolts, screws and nuts, shall no longer be used. Should these sizes, however, be required for spare parts, they may be ordered in accordance with DIN 934, April 1968 edition3).  The table below specifies dimensions of such nuts, DIN 13 Parts 1 and 15 applying for the screw thread.

Standards referred to

 DIN 13 Part 1    ISO metric screw threads ; 1mm to 68mm diameter coars pitch threads ; nominal sizes

 DIN 13 Part 12   ISO metric screw threads ; coarse and fine pitch threads with diameters from 1 to 300 mm ; selection for diameters and pitches

 DIN 13 Part 15   ISO metric screw threads ; fundamental deviations and tolerances for screw threads of 1mm diameter 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 267 Part 4    Fasteners ; technical delivery conditions ; property classes for nuts ( previous classes)

DIN 267 Part 5    Fasteners ; technical delivery conditions ; acceptance inspection ( modified version of ISO 3269, 1984 edition)

DIN 267 Part 9    Fasteners ; technical delivery conditions ; electroplated components

DIN 267 Part 10   Fasteners ; technical delivery conditions ; hot dip galvanized components

DIN 267 Part 11  Fasteners ; technical delivery conditions ; with addenda to ISO 3506 ; corrosion –resistant stainless steel components

DIN 267 Part 18  Fasteners ; technical delivery conditions ; non-ferrous metal components

DIN 267 Part 20  Fasteners ; technical delivery conditions ; surface discontinuities on nuts

DIN 267 Part 21  Fasteners ; technical delivery conditions ; widening test for nuts

DIN 267 Part 23  Fasteners ; technical delivery conditions ; property classes for nuts with fine pitch thread ( ISO classes )

DIN 962     Bolts screws, studs and nuts ; designatioons, type and finishes

DIN 4000 Part 2  Tabular layout of article characteristics for bolts . screws and nuts

ISO 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

Prevlous editions

 DIN 89 Part 1 : 12.20、12.21、10.25 ; DIN 89 Part 2 : 10.22 ; DIN 429 : 12.20、12.21 ; DIN 554 : 10.29x ; DIN KrK 113 : 07.28、07.29 ; DIN Kr 751 : 12。34 ; DIN 934 Part 1 : 01.26, 04.29 , 10.34, 06.37, 04.42, 06.53, 03.61, 06.63 ; DIN 934 : 04.68, 07.82.

Amendments

The following amendments have been made to the July 1982 eniton.

a)    A note on the period of validity of this standard has been included.

b)    The standard has been editiorially revlsed.

c)    Wlthdrewn in 1982.

Explanatory notes

 For more than 20 years efforts have been directed towards the achievement of the international interchange ability of fasteners by preparing international standards for the product concerned. ISO Standards have now been publishen for the most important types of fasteners ( see ISO Standards Handbook 18).

However , international efforts only server a useful purpose if national standard are adapted as far as possible to international standards. Or ideaily replaced by them. Current DIN Standards alreadly agreen in substance with the relevant ISO Standards. But still differ in some respects, as for instance in the widths across flats for hexagon products. The federal  republic of Germany adopted International  Standard ISO 272 on widths across flats a national standard DIN ISO 272 in October 1979. Nevertheless, widths across flats deviating form DIN ISO 272 are still being used in Germany for nominal sizes M10、M12、M14 and M22. The table below compares the previous widths across flats with the new ones specified for the four nominal sizes referred to.

The manufacturers and users of hexagon products participating in the work of the Normenausschub Mechanische Verbindungseiemente ( Fasteners Standards Committee). Togeter with representatives of the dealers in fasteners, have decided to introduce th new widths across flasts in all relevant product standards. Since experience has shown, that the introduction of the new widths across flats has not been advanced by their inclusion in DIN Standards merely as preferred alternatives to the previous widths across flasts, the following decisions have been reached to accelerate the changeover procedure.

Supplementary to current DIN Standards specifting the prevous widths across flats , DIN ISO Standards dealing with the same products will, wherrver ISO Standards are avallable be published which , besides introduchng a number of other minor amendments, will specity the new widths across flats conforming to ISO 272. In both DIN and DIN ISO Standards attention will be drawn to the fact that the relevant ISO Standards are to be preferide and that the DIN Standard is to be Replaced after a trandition perlod of five years.

If no relevant ISO Standard is available, the DIN Standard will contain a foreword stating that the previous width across flats specifications are to be withdrawn after a transition period of five years and replaced by those specified in Iso 272.

This sets a time limit for both manufacturer and user of hexagon product by the changeover to the new widths across flats must be effected. The responsible committee is of the opinion, that it will still be possible after this period to obtain fasteners complying with the superseded specifications as spare parts.

In some case, the replacement of the previous DIN Standards by the relevant ISO Standards will have further consequences besides the changeover to the new widths across flasts, attention being drawn to this circumstance in the national foreword of the relevent DIN ISO Standards.

These consequences result from the fact that the ISO Standards have not yet reached the same revel of completeness as the DIN Standards. Thus a numberof nominal sizes, as well as several product specification for fine pitch threads are not found in the ISO product standards. Further more , ISO Standards on technical delivery conditions are still the initial stages, so that specific requirements are still subject to separate agreement when ordering products in accordance width ISO Standards, as they are not included in the desigination for order purposes.

Besides these comsequences, which are of importance when applying the new ISO Standards, amending the widths across flats also has a number of consequences as regards the use of the new products which the designer must take into consideration, Besides the different surface pressure for the bearing area of the nut or the heads of the bolts. These diffcultied ard discussed in Recommendation VDA 262 *) published by the Verband der Automobilindustrie e.V( German Automobile Manufacturers Association).

International Patent Classification

F 16 B 37/00

Obtainable from : Dokumentaion Kraftahrwesen e.V. Gronerstrabe 5. D——7140 Ludwigsburg.