| Name: | Sterling (unknown/unreleased) |
| MPN: | 55353 |
| Category: | triple-action twist lock |
| Locking Type: | full-auto |
| Locks: | double |
| Unlock Style: | lift-and-twist |
| Sleeve Rotation: | 90° (unlocked) | ~100° (maximum) |
| Shape: | other |
| Material: | aluminum |
| Profile: | T-beam |
| Nose: | keylock |
| Nose Guard: | none |
| Rivets: | domed |
| Gate Shield: | full |
| Anti Crossload: | captive eye(s) |
| Weight: | 104 g |
| Dimensions: | Length: 121.8 mm Width: 73.3 mm Rope Bearing Depth: 10.5 mm Gate Opening: 24.2 mm |
| Strength Ratings: |  23 kN |  7 n/a |
| Other Markings: | Forged: (sterling double-triangle logo) Laser: 55353   201200369 | (ratings) |
| Batch Marking Location: | spine-exterior-left |
| Collection Criteria: | ★ Manufacturing, Engineering, or Design ★ Historically Interesting or Iconic |
| Summary: | prototype captive eyes design - possibly for adjustable lanyard |
| Description & Commentary: | This strange triple-action carabiner is marked with the Sterling rope logo, and laser marked with typical item and batch numbers, strength ratings and encouragement to read the instructions. It has a captive eye section with a tapered slot alongside a smaller hole. This appears similar to the Kong Slyde and other related dynamic cowtails/lanyards/personal anchor devices. While it does adjust and hold bodyweight with 9-11mm rope, I am unclear on the limitations of the design and the conditions under which it might fail or function improperly. As with other designs of this adjuster style, the diameter of the rope and roundness of the rope is crucial in for it to block readily and adjust easily. This carabiner's tapered slot probably helps in both regards. Unlike the Slyde, the adjuster section (the slot + eye) does not pivot independent of the connector, which alievates some possible issues while introducing others. I was unable to find information about this carabiner on Sterling's website or my other archival sources. In reaching out to Sterling with the batch number and photos, I received a friendly response, with unfortunately little information about this design intention and history. However, Sterling did include this piece of information and (reasonable) request: "That carabiner was not produced for commercial use and we have not sold any units. Please retire the carabiner immediately." The person who provided this item to me stated item was for tree climbing tools, without additional details when pressed. If anyone can provide additional information, please contact me. |