DIN 933- 87
Sechskantschrauben mit Gewinde bis kopf; Gewinde M1.6 bis M52; Produktklassen A und B
This standard, together with DIN ISO 4017, September 1987 edition, supersedes the December 1983 edition.
This standard should be used together with ISO 4017, For detail, see Explanatory notes. It is intended to withdraw the present standard by 1 July 1992 at the latest.
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 M1.6 to M52 hexagon head screws threaded up to the head, assigned to product grade A, for sizes up to M24 and lengths not exceeding 10 d or
The screws are designed similar to those specified in DIN 931 Part 1, but are threaded up to the head and have commercial lengths up and including
If , in special cases, screws are to comply with specifications other than those given in this standard, e.g. regarding property class, these shall be selected in accordance with the appropriate standards.
2 Dimensions
Continued on page 2 to 9
As a general rule，screws are manufactured in the sizes for which values of mass (guideline values ) have been given.
3 Designation
Designation of an M12 hexagon head screw of nominal length, l=
Hexagon head screw DIN933-M12×80-8.8
If product grade A is required for sizes up to M24 with lengths over
Hexagon head screw DIN 933-M30×100-8.8-A
DIN 962 shall apply with regard to the designation of designs and types, with additional details to be given when ordering.
DIN 6900 shall apply with regard to the designation of designs with captive components.
DIN 7500 Part 1 shall apply with regard to the designation of designs with thread rolling properties.
The DIN
DIN 933 Page 7
Appendix A
Additional 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. In consideration of existing documents and of the demand for spare parts, they may, however, still be ordered in accordance with DIN 933, December 1970 edition *). The table below shall apply with regard to the dimensions of bolts (DIN 13 Part 1 and 15 applying with regard to screw threads).
*) Withdrawn in 1982.
Page 8 DIN 933
Standards referred to
DIN 13 Part 1 ISO metric screw threads;
DIN 13 Part 1 ISO metric screw threads; coarse and fine pitch threads with diameters from 1 to
DIN 13 Part 15 ISO metric screw threads; fundamental deviations and tolerances for screw threads of
DIN 78 Thread ends and ends of projection of bolt ends for ISO metric threads in accordance with DIN 13
DIN 267 Part 1 Fasteners; technical delivery conditions; general requirements
DIN 267 Part 2 Fasteners; technical delivery conditions; finish and dimensional accuracy
DIN 267 Part 5 Fasteners; technical delivery conditions; acceptance inspection
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 19 Fasteners; technical delivery conditions; surface discontinuities on bolts
DIN 931 Part
DIN 962 Bolts, screws, studs and nuts; designations; types and finishes
DIN 4000 Part 2 Tabular layout of article characteristics for bolts, screws and nuts
DIN 6900 Screw and washer assemblies
DIN 7500 Part 1 Thread rolling screws for ISO metric threads; dimensions, requirements, testing
ISO 898 Part 1 Mechanical properties of fasteners; bolts, screws and studs
ISO 4759 Part 1 Tolerances for fasteners; bolts, screws, and nuts with thread diameter ≥1,6 and ≤
Previous editions
DIN KrK 144:02.31; DIN Kr 553: 09.35; DIN 933 Part 1:07.26, 04.42, 12.52, 03.63; DIN 933 Part 2: 07.26, 04.42; DIN 933: 12.67, 12.70, 12.83.
Amendments
The following amendments have been made to the December 1983 edition.
a) A note on the period of validity of this standard has been included.
b) For sizes M10, M12, M 14 and M22, the widths across flats as specified in ISO 272 have been deleted.
c) A reference line for the determination of the bearing face diameter, dw, has been included.
Explanatory notes
For more than 20 years efforts have been directed towards the achievement of the international interchangeability of fasteners by preparing international standards for the product concerned. ISO Standards have now been published for the most important types of fasteners (see ISO Standards Handbook 18).
However, international efforts only server a useful purpose if national standards are adapted as far as possible to international standards, or, ideally, replaced by them. Current DIN Standards already agree in substance with the relevant ISO Standard, 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 as national standard DIN ISO
The manufactures and users of hexagon products participating in the work of the Normenausschub Mechanische Verbindungselemente (Fasteners Standards Committee), together with representatives of the dealers in fasteners, have decided to introduce the new widths across flats 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 flats, the following decisions have been reached to accelerate the changeover procedure.
Supplementary to current DIN Standards specifying the previous widths across flats, DIN ISO Standards dealing with the same products will, wherever ISO Standards are available, be published which, besides introducing a number of other minor amendments; will specify the new width across flats conforming to ISO 272. In both DIN and DIN Standards attention will be drawn to the fact that the relevant ISO Standards are to be preferred and that DIN Standard is to be replaced after a transition period 5 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 5 years and replaced by those specified in ISO 272.
This sets a time limit for both manufacturer and user of hexagon products by which the changeover to the new widths cross 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 cases, the replacement of the previous DIN Standards by the relevant ISO Standards will have further consequences, besides the changeover to the new widths across flats, attention being drawn to this circumstance in the national foreword of the relevant DIN ISO Standards. These consequences result from the fact that the ISO Standards have not yet reached the same level of completeness as the DIN Standards Thus a number of nominal sizes, as well as several product specifications for fine pitch threads are not found in the ISO product standards. Furthermore, ISO Standards on technical delivery conditions are still in the initial stages. so that specific requirements are still subject to separate agreement when ordering products in accordance with ISO Standards, as they are not included in the designation for order purposes.
Besides these consequences, which are of importance when applying the new ISO Standards, the amendment of the widths across flats also have a number of consequences as regards the use of the new products which the designer must take into consideration. Besides the amended assembly sizes, this applies above all to the different surface pressure for the bearing area of the nut or the heads of the bolts. These difficulties are discussed in Recommendation VDA 262 *) published by the Verband der Automobilindustrie e.V.(German Automobile Manufacturers Association).
International Patent Classification
F 16 B 35 / 00
*) Obtainable from: Dokumentation Kraftfahrwesen e.V., Gronerstrabe 5, D-7140 Ludwigsburg.
