Overview
EN 1661 has a regular hexagonal shape with a threaded connection in the center; the nut has special notches on the outside that cut into the metal when tightened.
Strength class EN 1661
The strength class of an EN 1661 nut is the maximum applied force that causes the nut to fracture. EN 1661 nuts are manufactured in strength classes from 6 to 12. From strength class 8 onwards, the nut is considered to be high-strength.
Materials for the manufacture of EN 1661 spur nuts
EN 1661 is manufactured in the following materials:
- Steel, which can be optionally coated with hot-dip galvanized, ordinary galvanized, yellow galvanized and zinc plated
- Stainless steel (A2, A4) does not need to be coated
Application area of the nut DIN 6923
DIN 6923 is used in industrial construction, machine tool and instrumentation, etc.
In addition, the range of applications directly depends on the material of manufacture and the coating of the product:
- Galvanized steel offers good corrosion protection if the fastener is to be used in aggressive environments.
- Stainless steel allows the fasteners to be used at high temperature extremes and in aggressive and humid environments.
