Petzl Delta Link

The Petzl Delta link is a triangular steel quick link, often called a maillon, for connections that stay closed for long periods. Arborists use it to join hardware for good, such as attaching devices to a saddle bridge or closing a harness attachment point where the maker allows it.

When a quick link beats a carabiner

A carabiner is made to be opened and closed all day. A quick link is the opposite: you close it once and leave it, which makes it ideal for gear that should stay put. The delta shape keeps a three-way load centered in the link, which suits closing a harness or holding a device and a tether together.

Check Petzl's ratings and your saddle maker's instructions to confirm a Delta is approved for the connection you plan to use it on. See more climbing hardware for rings and connectors.

Steel is heavier than aluminum but resists wear far better, which matters on a connection where a rope or another piece of hardware rubs all day.

Closing and inspecting it

Screw the sleeve fully closed and snug it. A quick link is only rated when the sleeve is closed. Check it during the day, as vibration can work it open, and some climbers close it with a wrench where the maker allows.

Inspect before every climb for corrosion, cracks, bending and damaged threads, and retire it after a big fall or if the sleeve will not turn smoothly. Life-support gear must meet the applicable standard, be used per the manufacturer's instructions and ANSI Z133, and be inspected before every climb. Get trained before you rely on it aloft.