Antal Aluminium Sheave OPF 100 mm
A genuine Antal replacement sheave for OPF (One-Piece Frame) blocks. The 100 mm aluminium sheave runs on a low-friction composite fibre radial bearing with self-captive Delrin® side balls, delivering smooth rotation under high loads with no lubrication required. Supplied with a ground stainless-steel hub for precise alignment and long service life, it’s ideal for renewing tired OPF blocks or creating custom high-load deflection points on cruising and performance yachts.
Why it’s a smart upgrade
- High load, low friction: composite fibre radial bearing plus Delrin® side balls maintain efficiency under heavy sheet/halyard loads.
- Durable and light: hard-anodised aluminium sheave and stainless hub balance weight and longevity in harsh marine environments.
- Drop-in fit: built around Antal’s OPF architecture for quick refreshes and consistent performance.
Key specifications
- Sheave Ø: 100 mm
- Max rope Ø: 16 mm
- Safe Working Load (SWL): 3,500 kg
- Thickness (T): 21 mm
- Axle/bore Ø (D3): 20 mm
- Hub Ø (D2): 25 mm
- Bearings: Composite fibre (radial) + Delrin® balls (side)
- Sheave material: Aluminium
- Supplied with: Stainless-steel hub
- Weight: ~164 g
Typical applications
- Refurbishing Antal OPF 100 mm single, foot, stand-up and pad-eye blocks.
- Custom high-load turning points for mainsheets, genoa sheets, cascade tackles and mast-base organisers (within stated SWL).
Fit & compatibility notes
- Confirm your existing block’s sheave Ø (100 mm), axle/bore Ø (20 mm) and thickness (21 mm) before ordering.
- Intended for rope up to 16 mm; for wire use the corresponding Antal wire-specific sheaves.
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Spécifications
| Width (mm) | 21 |
| Cordage recommandé – Ø Max (mm) | 16 |
| Ø Intérieur (mm) | 20 |
| Matériau | Aluminum |
| Ø réas (mm) | 100 |
| Charge de travail (kg) | 3500 |
| Poids (g) | 164 |
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