GOST 11871-88 Slotted round nut

 GOST 11871-88 spline nut is a nut used to fix coaxial parts on shafts, such as bearings, bushings, ball bearings and other rotating parts. Usually they are lower and smaller in external parameters than standard hex nuts, but they are often used on large shafts, so a design was invented in which they can be tightened with a special wrench that is smaller than a regular open-end wrench of the corresponding nut diameter. The wrench clings to one of the nut's splines with a special tooth and, bending around its body, rests against it, making it possible to apply force when turning it.

Fastening group of GOST 11871-88

     Nuts of GOST 11871-88 are most often made of stainless steel and belong to the group of stainless fasteners.

Materials for manufacturing nuts of GOST 11871-88

     Nuts of GOST 11871-88 are made of the following materials 

• Steel
• Stainless steel grade A2

Scope of application of GOST 11871-88 nuts

     Slotted round nuts are used in mechanical engineering. Such fasteners are used for installation in mechanisms and assemblies where there is only limited access to the connection. The special shape of the nut and the presence of side slots allow it to be tightened without using a standard wrench; a special tool provides a sufficiently high tightening force.

     It is used on machine tool assemblies, car shock absorbers, bicycle assemblies, photographic lenses, etc.