Overview
GOST 21331-75 is a screw with a high head and a threaded ridge. This feature is an advantage compared to other hardware in the screw category. The head has a side rib with a chamfer, which makes it easy to loosen the screw. The design of the screw also provides for a cylindrical head, the metal rod is provided with a full metric thread. The head does not have a slot, as this type of screw is designed for fast manual tightening and loosening. They are used to create quick-release connections of various parts.
Strength class GOST 21331-75
Screws of GOST 21331-75 are made of steel of strength class 5.8.
Fastening group of GOST 21331-75
Screws of GOST 21331-75 are most often made of stainless steel and belong to the stainless fasteners group.
Materials for the manufacture of GOST 21331-75 screws
Screws of GOST 21331-75 are made of the following materials:
- Steel, strength class 5.8, which can be additionally coated with zinc. Zinc (Plated) protects against corrosion if the fasteners are to be used in aggressive environments.
- Stainless steel grade A1. Steel grade A1 allows the fasteners to be used at significant temperature drops and in aggressive and humid environments.
Scope of application of GOST 21331-75 screws
Screws of GOST 21331-75 are widely used in furniture production, and it is also used to create quick-release structures in instrumentation. The high head of a special configuration provides easy and fast loosening, which is one of the main advantages of this fastener.
