Gjengerstopper

Gjengerstopper is a mechanical component used to limit the depth of engagement of a threaded fastener, ensuring a controlled and repeatable assembly. By acting as a physical stop, it prevents overtightening, thread damage, and excessive penetration into a mating part. The device can be integrated into a nut, a washer, or fitted as a separate insert on a bolt or stud.

There are several common variants. External thread stoppers are placed on the male thread to contact a surface or a shoulder and stop further rotation. Internal thread stoppers are used inside a tapped hole or nut to set a maximum engagement length. Adjustable or replaceable stoppers allow fine-tuning of the engagement depth for different applications. Some designs include locking features such as set screws or adhesive bonds to maintain position.

Materials and coatings vary with application. Common choices include steel and stainless steel for strength, brass for good corrosion resistance, and engineering plastics for light-duty or non-marring requirements. Coatings may include zinc, black oxide, or corrosion-resistant finishes.

Applications span automotive, machinery, electronics, and consumer products, wherever precise engagement and protection of threads are important. Advantages include preventing thread stripping, ensuring consistent assembly, and enabling easier disassembly when the stopper is replaceable. Installations must match the correct thread size and pitch, maintain proper clearances, and consider lubrication, sealing, and torque specifications.

In practice, gjengerstopper is a descriptive term for devices designed to control threaded engagement rather than a single standardized component, with implementations tailored to specific fastener systems.