Hexagon socket head screw DIN 912 / ISO 4762

Black hexagon socket head screw (without galvanizing) are used where screws are continuously oiled and therefore do not rust. Black steel is inexpensive and is often used in tool and mold making.

Galvanized steel is used where there is hardly any protection through lubrication and stainless steel is too expensive. It is often used in mechanical engineering.

Stainless steel is used where rusting screws are unacceptable under any circumstances. Stainless steel grades A2 and A4 are used in the food and pharmaceutical industries. A4 has the advantage over A2 that it is also acid-resistant. It protects against chlorine and can therefore also be used in swimming pools, for example.

The higher the tensile strength, the lower the elasticity (toughness) of a screw. A screw 8.8 with a nominal value of 800 N/mm2 has less tensile strength compared to a screw 12.9 (1200 N/mm2), but is more elastic. Screws of strength class 8.8 are used where the screw must be flexible and yield slightly due to movement or vibration. With harder screws, cracks form or they break.

Screws with a fine thread have a smaller pitch, i.e. more threads than the same screw with a standard thread. Screws with fine threads are therefore suitable for precision applications, as they can be adjusted more finely.

Nuts suitable for DIN 912 / ISO 4762 include hexagon nuts DIN 934, hexagon nuts DIN 936 and hexagon nuts DIN 439 form B.

Washers suitable for DIN 912 / ISO 4762 include washers without bevel DIN125/ISO7089 form A and washers with bevel DIN125/ISO7090 form B.

If a smaller head is required, the following screws are an alternative. hexagon socket head screws with low head DIN7984. If a key guide is also required, these screws may fit: Hexagon socket head screw with low head DIN6912. Hexagon socket clamping screws ISO7380-1 and lin-head screws with hexagon socket ISO7380-2 also have a smaller head than DIN 912 / ISO 4762. The latter have the washer integrated.

In the event that no screw head should protrude at all, as a flat surface is desired, countersunk screws with hexagon socket ISO10642 are an option.

If the hexagon socket is dispensed with at the head of the screw and an external hexagon is accepted instead, hexagon head screw threaded to head DIN933/ISO4017 and hexagon head screw with shank DIN931/ISO4014 are available.