GOST 7786-81 Bolts with countersunk head and square head accuracy class CBolts GOST 7786-81 – screws with countersunk head and square head accuracy class C. Use will also require nuts (hex, square, or weld). The use of washers of various configurations (grovers, flat, etc.) will help to make the connection more reliable.
Description of the product design and its features
headrest and cylindrical threaded rod. The requirements for the accuracy class are imposed on the products, the standard provides for C.
The material of manufacture must have strength class 3.6, 4.6, 4.8, 5.6, 5.8 and 8.8. It can be both ordinary and stainless steel, and aluminum, PA 6.6 polyamide, brass, non-ferrous alloys.
Bolts are coated with zinc, chromium, nickel, cadmium, etc. in our own electroplating workshop. A multilayer coating is also available, such as copper-nickel (M.N.) or copper-nickel-chromium (M.N.X.6).
GOST 7786-81.pdf< p> An example of a symbol for a bolt with a thread diameter of 12 mm, with a coarse thread pitch with a tolerance field of 8 g, length 60 mm, strength class 3.6, with a zinc coating, 6 microns thick, applied by cathodic reduction, chromated: < p> Designation example: Bolt M12x60.36.016 GOST 7786-81
Product application areas
These bolts are used in many industries. Increased demand for products, in particular, is observed in the aircraft and machine-building industries, as well as in construction, energy and metalworking, where they are used for reliable fastening of parts and metal structures.
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