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Metric fitting standard is the combination of a metric thread and with some exceptions, a seal by a conical seat at 60 °, concave on the male part, convex on the female part.
Metric threads follow the German DIN thread shape identification specifications (Deutsches Institut für Normung = German Institute for Standardization).
In continental Europe, metric threads are very common, especially in screws and bolts. However, these threads are in the vast majority of cases those retained by the ISO standard,
which recommends a pitch for a given diameter.
In hydraulic connections, it is not that simple, and we can often find several pitches for the same diameter. If we take the example of the 10mm diameter, the ISO standard (M10) recommends the use of a “coarse” pitch of 1.5. The ISO 10mm thread is therefore
the M10x1.50. However, in hydraulic connections, we will also often encounter one of these two “fine” pitches: M10x1.00 or M10x1.25.
Thus, in our field, we use many more metric threads than those of the ISO standard.

• Thread

Diameter: The diameter is metric, expressed in millimeters on the outside diameter of the male part.
Pitch: The pitch of metric threads corresponds to the distance in mm between two threads.
Example: M10x1.25, the pitch, or the distance between two threads, is 1.25mm.
Identification: If we start from the convention of writing metric threads, it is difficult to speak of "threads per meter" or "10mm threads" in the same way as one speaks of "threads per inch" for imperial threads To identify the pitch
With a metric thread, it is easier to measure the length of 10 threads (by dividing this length by 10, we find the pitch) than to find the number of threads per 10mm or per meter.

• Sealing

Metric fittings generally have a 60 ° taper seat seal, except for braking where this seat is 90 °. With some exceptions, the male connector has a concave seat and the female connector has a convex seat.
However, we can find fittings or reverse seat implantations (the female is concave, and the male is convex). To overcome this eventuality, there are also "double
seat ”which ensure the seal regardless of the direction of the seat from the opposite part.
There are also flat seat (or seatless) fittings, which require the use of a gasket.
In all cases (inverted seat, double seat or flat seat), the particularity is specified in the reference.

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