ISC Steel Arborist Auto Single-Locking Carabiner
High‑strength 50 kN steel auto‑locking arborist carabiner with a 1 in gate opening, built on the ISC “Big Dan” platform for secure connections in demanding tree work systems.
This ISC Steel Arborist Auto Carabiner Single‑Locking is a heavy‑duty connector designed for modern tree climbing and rigging setups where strength and reliability are critical. With a 50 kN minimum breaking strength, it comfortably exceeds typical life‑support requirements and provides a generous safety margin for climbing, work positioning, and hardware terminations. The 1 in (approximately 25–27 mm) gate opening makes it easy to clip onto connection points such as rings, sling eyes, and multiple rope strands.
The auto‑locking gate reduces the risk of accidental gate opening by requiring a deliberate action to unlock and open, then automatically relocking when released. Manufactured in Great Britain from heat‑treated steel, the Big Dan‑style body offers a robust feel with good strength‑to‑weight balance and a durable zinc‑plated finish. It is well suited to arborists who prefer steel hardware for longevity in high‑wear connection points such as central attachments, rigging interfaces, and device terminations.
- 50 kN steel construction: Heavy‑duty forged steel body rated to a minimum breaking strength of 50 kN for life‑support and demanding arborist applications.
- 1 in gate opening: Approximately 25–27 mm gate clearance makes clipping onto thick slings, multiple rope legs, or hardware clusters straightforward.
- Auto‑locking single‑action gate: Twist‑lock style gate that automatically locks closed, helping prevent accidental opening during climbing and work positioning.
- Big Dan geometry: ISC KH455 “Big Dan” pattern carabiner with a broad profile for easy handling and efficient load distribution.
- Durable zinc‑plated finish: Corrosion‑resistant finish designed to withstand regular outdoor use and contact with metal hardware.
- Made in Great Britain: Manufacturer part number KH455TL1.2, produced by ISC in Wales to EN 362‑type industrial connector standards.





























