SEEGER Runddrahtsprengringe f.Bohrungen DIN 7993B-FeSt RB 20

When oil is used alone as a rust inhibitor, the oil provides a hard but flexible finish that expels any excess moisture and air. It displaces moisture and air from rusted metal and thus puts rust in its place.

Spring steel is a steel that has a higher strength compared to other steels, but with very high elasticity. Tension discs and disc springs are made of spring steel so that the spring forces defined in the standard can be achieved.

The tempering process of screws and nuts (heating - holding - quenching - tempering) results in a thin baked oxide layer, which is referred to as tempered black. This surface condition is not a surface coating and therefore offers no corrosion protection.