Comby-Nut is combination of nut and washer, i.e. nut and washer assembly.
Simplify assembly, reduce installation times and reduce your number of parts. During assembly process, only the nut would be rotated. Risk of scratch on workpiece during tightening process can be highly reduced. If you need some more function, such as prevailing torque value or any special surface treatment for coefficient of friction, all requirement can be met by additional production process.
Carbon Steel, Alloy Steel, Copper, Brass