Black Diamond ATC Belay Device 4000-218
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Black Diamond ATC Belay Device

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Free store pickup

Order online, get it at your local MEC. It couldn’t be easier.

Rocksolid Guarantee

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Really. If it's not up to snuff after you use it (a couple times) you can still bring it back.

It lasts longer than 30 days, but not forever. We'll be fair about it.

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Show Description

The Air Traffic Controller (or ATC) has a cone shape that encourages non-jamming rope feeding. Particular attention has been paid to the slots, which are designed with an elliptical shape similar to a bight of rope. The dynamic braking quality, which allows rope to slip through the device, is important in limiting forces on the belay chain. The walls are somewhat less thick on the ATC and, as with other devices, will wear thinner over time.

  • For twin, half, or single rope belay and rappel.
  • Integral rigid keeper wire won’t get sucked into slots.

Tech specs

Show Tech specs
Weight 55g
Ideal for
  • Snow and ice climbing
  • Rock climbing
  • Indoor climbing
Type Tubular
Material Aluminum alloy
Rope diameter

The maximum diameter or the range of rope diameter that is compatible with the device.

7.7 - 11mm
Belay off anchor

Use an autoblock device with a locking carabiner to belay off the anchor or to bring up two seconds on independent lines.

CE certified Yes
Made in Taiwan