The correct method to measure the length or grip of a Dzus Fastener is to measure it from under the head of the fastener to then bottom of the spring locking area. Flush Head and Self-Ejecting Dzus Fasteners are measured from the top of the head to the bottom of the spring locking area.

Dzus Springs are available in 1″ and 1-3/8″ sizes. The size is determined by the distance between the rivet centres of the spring.

The height or reach of the spring is measured as per the diagram to the left.