CMC Clutch

The CMC Clutch is a versatile rope clamp developed for rescue, rope access, and arborist work. It combines several functions in a single unit, saving time, equipment, and weight.

More is possible
The CMC Clutch is the latest evolution in rescue and rope access equipment. It was developed in collaboration between CMC, with roots in rescue and rope access, and Harken Industrial, experts in high-performance sailing technology. With a combined 90 years of experience in rope management under heavy loads, the Clutch offers optimal efficiency, simplicity, and control for arborists, rescue personnel, and rope access technicians.

The Clutch works seamlessly between anchor systems and personal use, replacing traditional equipment with its versatility. It handles hauling, controlled lowering, smooth personal descent, easy climbing, belaying, and Twin Tension Rope Systems.

Features

• Single unit for efficient hauling, controlled lowering, smooth personal descent, easy ascent, belaying, and Twin Tension Rope Systems.
• Up to 38% higher efficiency in hauling and ascent compared to cam-based devices – reduces the need for changeovers.
• Seamless transition between anchor systems and personal use, replacing multiple pieces of equipment.
• Combines functions of load control devices and personal descent devices – reduces training and costs.
• Instant transition between hauling/lowering or ascent/descent without transferring the load.
• Enables twin tensioning of main and safety ropes in mirrored or nested configurations (Double Clutch technology).
• Replaces 8 traditional components: pulley, rescue sheave, anchor plate, load-releasing strap, prusik cord, and 3 carabiners.
• 11 mm Clutch with CMC G11 Lifeline builds NFPA G-rated systems with 11 mm ropes – saves space and weight.
• Patented design, made in the USA.

Components

• Stainless steel disc with ratchet and rotation function for efficient and audible auto-locking during progression.
• Innovative double-gated side plate for secure rope loading/unloading, independent of attachment point.
• Anti-Panic brake and force limitation for operational safety and overload protection.
• Milled aluminum chassis with stainless wear guards for low weight and high durability.
• Integrated becket for direct connection of mechanical advantage components.
• Control handle with a large "sweet spot" for smooth, progressive control during lowering and descent.
• Included screw for the side plate creates captive rope systems for quick deployment.

Technical specifications and certifications

11 mm Clutch (Grey):

• Rope diameter: 10.5–11 mm
• Certifications: NFPA 1983 (2017) General Use (G) MBS 40 kN (8,992 lbf) PULLEY, GENERAL USE (G) Descent Control ø 10.5–11 mm, GENERAL USE (G) Belay Device ø 10.5–11 mm; ANSI/ASSE Z359.4-2013; CE EN 12841:2006/C, EN 341:2011/2A, EN 15151-1:2012/8

13 mm Clutch:

• Rope diameter: 12.5–13 mm
• Certifications: NFPA 1983 General Use and ANSI

The CMC Clutch is the only device for 10.5–11 mm ropes with all these certifications. Perfect for arborists who require reliable, multi-functional equipment for tree work and height access.