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 Lockjack Sport Mechanical Friction Hitch  Lockjack Sport by ART
Lockjack Sport image

Lockjack Sport

Lockjack Sport

Buy the Lockjack Sport

Lockjack Sport with Swivel Adapter

Buy Lockjack Sport Replacement Parts

11-12mm Clutch
12-13mm Clutch
Friction Plate

Buy Lockjack Sport Add-ons

Swivel Adapter

The Lockjack can totally replace the friction hitches used on climbing lines. The Lockjack works as both an ascender and as a descender for self-belay in the doubled rope technique (DdRT). The advantage of the Lockjack is that friction is applied to the rope with a smooth aluminum surface which causes less friction while climbing for an effortless advance, and a smoother more easily controlled descent.

While climbing, the Lockjack tends slack by itself as the weight of rope below the climber pulls the line through the device. Works with 7/16” or 1/2” rope with a simple part change of the clutch (both clutch sizes are included.) Use with a small D or Oval carabiner only. A larger carabiner may allow the wooden ball to pass through and become stuck, resulting in free fall.


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Additional Features

  • Smooth friction
  • Precision control
  • Ascend in DdRT
  • Descend in DdRT
  • Easy advancement
Manufacturer : ART
Made in : Germany
Min Rope Size : 7/16” (11mm)
Max Rope Size : 1/2” (13mm)
Weighs : 9.6 oz (292 g)

The Lockjack is a comfortable, efficient and easy to handle device invented by Hubert Kowalewski to assist tree climbers all over the world. The Lockjack Sport offers every climber, beginner or pro, safe, dynamic and energy saving climbing in trees. The Lockjack allows for efficient ascent on the climbing line or along the trunk. In the tree crown a one-handed pull on the rope is enough to manage slack.

While beginning an ascent, it is easy for the climber to feed the rope from top with one hand through the rope duct on the Lockjack. After ascending a few meters, the weight of the rope below the climber is enough to pull the slack through the Lockjack.

The Lockjack can be customized with the ART Lockjack Swivel Adapter which allows the Lockjack to compensate for twists and turns of rope and the climber. Combined with the Ropeguide the Lockjack Sport has in recent years much added to the efforts in establishing an efficient as well as safe climbing style.

Lockjack Sport Instructions


  • CE EN 358

ANSI Z133-2017

The American National Standards Institute (ANSI) has released the ANSI Z133 safety requirements which apply to arboriculutral operations.

This item is ANSI compliant.

The full ANSI Z133 safety requirements are available on our tree care standards page.

Customer Reviews

Add your own review

Rated: Excellent Review by: Daniel

“ I have climbed commercially on one of these for six years. I have had to replace that where parts on at least three occasions I still enjoy climbing with it. It does have a tendency to creep up the rope when there is light load on it. It takes some getting used to especially when used with a friction saver. I would recommend if you get a chance to try one out give it a go. ”

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