Description

D5 Descender – Advanced Rope Descent Device with Double Safety Locking Mechanism

The D5 Descender is a cutting-edge tool

ISC D4 & D5 Descenders: Advanced Self-Braking Control for Rope Access & Rescue

Precision Descent with Auto-Lock and Panic Protection-Built for Pros at Height

From the innovators at ISC (Industrial Safety & Climbing), the D4™ and D5™ descenders redefine safety and control for work at height, rope access, fire rescue, and tower climbing. These double-stop devices feature an intuitive auto-lock that engages when you release the handle, plus a non-sensitive panic brake for confident handling. With progressive cam technology for smooth operation at any speed, easy back-feeding for ascents or hauling, and a robust 240kg (529lb) working load limit, they're engineered for demanding environments. Compliant with global standards like CE, NFPA T/G, and ANSI Z359.4, both models support two-person use and minimum user weights of 60kg (132lb)-no extra friction needed for ultimate control.

Model Comparison

Model	Rope Compatibility	Key Safety Features	Compliance & Load	Unique Advantages
D4™	10.5-11.5 mm (7/16") ropes	Auto-lock on handle release; progressive stainless steel cam; non-sensitive panic brake	CE, NFPA T, ANSI Z359.4; 240kg (529lb) WLL; 2 persons	Innovative dual-cam action for variable speed control; easy back-feed for ascents/Z-rig hauling; anodized finish for corrosion resistance
D5™	1/2" (12.7 mm) ropes	Auto-lock on handle release; double safety locking mechanism; non-sensitive panic brake	NFPA G, ANSI Z359.4; 240kg (529lb) WLL; 2 persons	Easy attach/detach without dropping (stays on harness); push-button click-lock; optimized for North American fire/rescue & tower work

Core Features Across Both Models

Progressive Cam Design: Super-hard stainless steel cam (D4) provides smooth control at slow or fast speeds-inner cam within outer cam for precise grip without jamming.
Auto-Lock Functionality: Instantly stops descent when handle is released, enabling hands-free positioning and belay applications.
Panic Brake Protection: Activates only if needed, avoiding over-sensitivity for natural, fatigue-free use during extended operations.
Versatile Rigging: Back-feed rope effortlessly for smooth ascents or 2:1 Z-rig emergency hauling; no additional friction required for rated loads.
Ergonomic & Durable Build: Anodized aluminum side plates; serial numbering for traceability; optional EZY-ID for quick identification.
Proven Performance: Rated for 60kg+ users; supports two-person rescue; fully certified for worldwide rope access, rescue, and industrial markets.

Why Choose ISC D4 & D5 Descenders?

ISC's commitment to innovation shines in these descenders-trusted by rescue teams, tower climbers, and rope access specialists for their reliability and user-centric design. The D4 excels in international markets with its corrosion-resistant cam, while the D5's double-lock system ensures drop-proof security in high-stakes North American ops. Lightweight yet indestructible, they reduce setup time, enhance safety, and boost efficiency on every drop.

Descend with total assurance. Pick the D4 for metric ropes or D5 for imperial-in stock and certified ready. Gear up for safer heights today.

designed for safe and controlled descents, with a unique double safety locking mechanism that prevents accidental opening under load. Ideal for professionals, this device ensures reliable performance in a variety of rope work scenarios.

Key Features:

Double Safety Locking Mechanism: The side plates cannot rotate open when loaded, offering enhanced security with the carabiner and push-button click-lock closure.
No Risk of Accidental Drops: The D5 easily attaches and detaches from rope without needing to remove it from your harness, eliminating the risk of dropping the device.
Smooth Ascending & Emergency Hauling: The device allows for easy back-feeding of the rope, making it suitable for both smooth ascents and emergency hauling.
Variable Descent Speed Control: Users can adjust their descent speed, moving quickly or slowly depending on needs, with an anti-panic feature to prevent over-acceleration.
Ergonomic Handle Design: The newly repositioned handle (25° back from the original) offers a more ergonomic grip, making it comfortable to use, even during extended operations.
Ideal for Two-Person Rescue: The D5 is perfect for two-person rescues without adding extra friction when using a carabiner with a redirect.
Easy, Secure Operation: The push-button closure is easy to open with gloves but difficult to operate under load, providing an added layer of safety with an audible click when securely closed.

The ISC Descender is the ideal tool for professionals seeking a reliable, user-friendly, and safe descent device, engineered for both routine rope work and critical rescue operations.