GOST 7785-81 Bolt with countersunk head and projection (whisker)

  GOST 7785-81 is a bolt with a countersunk head and a protrusion (whisker). The peculiarity of this bolt is the countersunk head, the absence of a spline and a whisker, which, when it crashes into a wooden surface, does not allow it to twist when tightened. A special whisker prevents the bolt from loosening under the influence of vibration. In cases where it is necessary to connect parts made of wood and metal, the head of the bolt with the whisker is lined with softer material.

Strength class GOST 7785-81

     The strength class of a bolt according to GOST 7785-81 is the maximum applied force at which the bolt begins to fracture. GOST 7785-81 bolts are manufactured in strength classes 4.6 and 10.9. From strength class 8.8, the bolt is considered high-strength. High-strength GOST 7785-81 should be purchased only from trusted suppliers. It is made of alloy steel and such bolts are used for critical projects where, in addition to high loads and static loads, GOST 7785-81 bolts are subjected to constant vibration.

Fastening group of GOST 7785-81

     Bolts of GOST 7785-81 are made of high-strength steel and belong to the high-strength fasteners group.

Materials for the manufacture of GOST 7785-81 bolts

     Bolts of State Standard GOST 7785-81 are made of steel of strength classes 10.9 and 4.6. The high strength class of 10.9 allows the bolts to be used for highly loaded connections.

Areas of application of GOST 7785-81 bolts

     GOST 7785-81 bolts are mainly used in the furniture industry, although they are sometimes used in construction and instrumentation. Due to the fact that the bolt has a flat head end that does not contain elements capable of transmitting torque, the option of unscrewing it from the front side is completely excluded.