691
3.00 (76 mm) Narrow Hi-Load Halyard Sheave
Narrow high-load sheaves in mastheads improve sail handling, speed sail changes, and allow the use of smaller, lighter halyard winches. Sheaves combine sideload-carrying balls with a PTFE composite bushing for radial loads.
Technical specifications · Harken 691
| Sheave diameter | 76 mm |
|---|---|
| Width | 16 mm |
| Weight | 128 g |
| Centre pin diameter | 12.7 mm |
| Line diameter | 10 mm |
| Maximum wire diameter | 5 mm |
| Maximum working load | 1814 kg |
| Breaking load | 7484 kg |
The stated breaking load is based on a solid 304 stainless steel shaft.