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What does a DIN standard reveal?
 Just like any other standard, the DIN standard delivers standardisation and simplicity. For example, for a query it would suffice to say "DIN 933, M12 x 40, A4-70" to define a multitude of features. This means that you don't always have to cross-check the requirements of a product and the customer can be sure that he or she receives precisely the goods they ordered.



Standards define at least one of the following features:

Head shape   (e.g. hexagon head, hexagonal socket, raised countersunk head)
Type of thread  (e.g. standard metric ISO thread M, sheet metal thread) Thread length
Thread pitch
Material and strength class
Possible coatings and strength characteristics

= thread length for screws whose thread does not extend to the head (partial thread screws)

d = thread diameter in mm

e = corner measurement on head
k = height of head
I = nominal length of screw this also indicates how the length of a screw is measured.

S = width across flats

example below should explain what the following details mean:

 DIN 931, M 12 x 40, A4-70

DIN 931 = hexagonal screw with shoulder M    = metric ISO thread

12 = d… thread diameter of screw of 12 mm
X 40 = l… nominal length in mm
A4 = material class, stainless steel A4
- 70        = strength class 70
P            = the thread pitch is stated by a number. If this number is not provided, it is a standard thread. (M 12 x 40). The pitch is only stated for screws with a thread other than standard thread, e.g. M 12 x 1 x 40 designates a