Tibloc Device PETZL 0000137500000035 Compact lightweight rope progress-capture pulley for ascent and hauling

The Petzl Tibloc is a compact, lightweight rope progress-capture pulley designed for ascent, hauling and fall-arrest on single kernmantel ropes. Its small aluminium body and integrated cam provide one-way rope movement: the device allows rope to feed in one direction while gripping and locking when pulled in the opposite direction. The Tibloc can be used as a progress-capture pulley in hauling systems, as a self-belay aid during rope ascent or for simple temporary fall arrest in lightweight rigging and rescue scenarios. The device is compatible with a range of single ropes and is simple to install and operate, making it a versatile addition to personal climbing, canyoning and rescue toolkits.

Advantages

The Tibloc combines minimal weight and compact dimensions with a reliable cam mechanism that captures the rope quickly under load. Its aluminium construction is corrosion-resistant and the device has a low profile that reduces snagging. Installation requires no complex assembly: the rope is positioned through the device and the cam provides immediate capture without the need for additional hardware. Because of its size and weight, the Tibloc is convenient to carry as a backup progress-capture or self-belay solution.

Suitable for

• Ascending a single rope with a compact progress-capture aid
• Creating simple hauling systems where a one-way pulley is required
• Self-belay during aid climbing, caving or technical access
• Lightweight rescue and work-at-height tasks requiring temporary rope capture

When it may not be suitable

The Tibloc is not intended as a primary belay device for dynamic lead climbing or as a substitute for certified fall arrest equipment in industrial settings. It is designed specifically for use on compatible kernmantel single ropes; performance is dependent on correct rope diameter and condition. For continuous repetitive hauling of very heavy loads or for complex multi-pulley mechanical advantage systems, a dedicated pulley with bearings and higher load ratings may be more appropriate.

Key specifications

• Device type: compact progress-capture pulley with cam
• Material: aluminium body with stainless or treated steel cam components
• Intended rope type: single kernmantel ropes (see manufacturer rope diameter recommendations)
• Typical applications: rope ascent, hauling systems, self-belay and temporary fall-capture
• Weight category: ultra-light / compact (minimal carried weight)

How to use

Pass the single rope through the opening of the Tibloc so that the cam can engage the sheath when loaded. Ensure the rope runs in the correct orientation through the device and that the cam is free to move. To ascend, clip the device to an ascender sling or carabiner and feed rope through while taking up slack; the cam will lock during descent or when a load is applied. In hauling setups, position the Tibloc to allow rope travel in the intended direction and to capture rope when tension reverses. Always follow the manufacturer's instructions for correct installation and verify the rope diameter and condition before use.

What to consider before purchase

• Compatibility with the rope diameters you use (check manufacturer recommendations)
• Intended application: ascent, hauling, or as a backup capture device
• Weight and size constraints if you need an ultra-compact solution
• Whether a higher-capacity pulley or a dedicated ascender is required for heavy loads or continuous use

Usage recommendations

Use the Tibloc as part of a comprehensive system: pair it with appropriate connectors, backup knots or secondary devices where required. Inspect rope and device before each use, practice correct orientation and loading in a controlled environment, and do not use the Tibloc beyond the rope types and loads specified by the rope and device manufacturers.