GOST 11871-88 A 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 GOST 11871-88
Depending on the material of manufacture, nuts according to GOST 11871-88 are divided into groups:
- Stainless fasteners - fasteners made of stainless steel
- Brass fasteners - fasteners made of brass
Materials for manufacturing nuts of GOST 11871-88
Nuts in accordance with GOST 11871-88 are made of the following materials:
- Steel, which can be additionally coated with zinc. Zinc protects against corrosion if the fastener is to be used in aggressive environments.
- Stainless steel grades A1 and A4. Allows the use of bolts at significant temperature changes and in aggressive and humid environments.
- Brass. Brass nuts are used if the system is subjected to frequent dynamic, vibration and cyclic loads.
Applications for nuts of GOST 11871-88
Nuts of GOST 11871-88 are widely used in the machine-building industry. They are used for the automotive industry, assembly of various parts of components and assemblies in machine tool building, instrumentation, etc. Their high strength and increased corrosion resistance extend the possibilities of their use as special fasteners, which can be used where standard hexagonal nuts cannot be used.
