Spinlock TC50 – 4x2 Sheave Double Stack Organiser (Symmetric and Asymmetric)
The Spinlock TC50 4×2 Sheave Double Stack Organiser is the largest model in the TC50/D range, designed for yachts requiring management of eight control lines in a dense, high-load configuration. Positioned in two stacked rows of four, the organiser uses 50 mm alloy sheaves on plain bearings to handle large-diameter lines and the extreme loads typical of modern performance rigs.
The lower row delivers the full TC50 Safe Working Load, while the upper row is rated for reduced loads, allowing high-load primary lines to run through the lower sheaves and secondary or moderate-load lines to run through the upper row. This dual-layer configuration allows substantial system capacity without expanding horizontal footprint.
The symmetrical and asymmetrical variants offer flexibility for deck layouts, while compatibility with line diameters up to 14 mm makes the organiser suitable for large and heavily loaded yachts.
Key Features
• Eight 50 mm alloy sheaves in two stacked rows (4 upper, 4 lower)
• High-load lower row combined with reduced-load upper row
• Plain-bearing sheaves for durability and consistent performance
• Symmetric and Asymmetric body options
• Compact footprint ideal for dense multi-line routing
• Suitable for halyards, reefing lines, tack lines, and control systems
• Supports lines up to 14 mm diameter
• Shares mounting geometry with TC50 single organisers for integrated systems
Load Ratings – TC50 Double Stack (TC50/D)
Upper Row (4 sheaves):
• SWL per sheave: 1000 kg
• Total SWL (4 sheaves): 4 × 500 kg = 2000 kg
Lower Row (4 sheaves):
• SWL per sheave: 1500 kg
• Total SWL (4 sheaves): 4 × 750 kg = 3000 kg
These ratings allow the organiser to handle multiple high-load and moderate-load lines efficiently within a single stacked arrangement.
Applications on Sailing Yachts
• Multi-halyard routing for large mainsails, jibs, staysails, and downwind sails
• High-load reefing and tack line systems on larger yachts
• Complex line routing scenarios requiring compact high-capacity organisers
• Performance cruisers and race yachts with dense line handling requirements
• Mixed-load organiser banks combining stacked and single TC50 units
Specifications
| Option* | Symmetric or Asymmetric |
| Total width (mm) | 52 |
| Recommended line - Max Ø (mm) | 14 |
| Total height (mm) | 66 |
| Fixing hole spacing (mm) | 56 |
| Total length (mm) | 267 |
| Sheave Ø (mm) | 50 |
| Mounting fasteners | M8 CSK Head (supplied) |
| Sideplate material | Composite |
| Sheave material | Alloy |
| SWL (kg) | 1000 |
| NBL (kg) | 2000 |
| Weight (g) | 1050 |
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