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
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High load, low friction: composite fibre radial bearing plus Delrin® side balls maintain efficiency under heavy sheet/halyard loads.
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Durable and light: hard-anodised aluminium sheave and stainless hub balance weight and longevity in harsh marine environments.
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Drop-in fit: built around Antal’s OPF architecture for quick refreshes and consistent performance.
Key specifications
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Sheave Ø: 100 mm
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Max rope Ø: 16 mm
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Safe Working Load (SWL): 3,500 kg
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Thickness (T): 21 mm
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Axle/bore Ø (D3): 20 mm
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Hub Ø (D2): 25 mm
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Bearings: Composite fibre (radial) + Delrin® balls (side)
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Sheave material: Aluminium
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Supplied with: Stainless-steel hub
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Weight: ~164 g
Typical applications
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Refurbishing Antal OPF 100 mm single, foot, stand-up and pad-eye blocks.
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Custom high-load turning points for mainsheets, genoa sheets, cascade tackles and mast-base organisers (within stated SWL).
Fit & compatibility notes
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Confirm your existing block’s sheave Ø (100 mm), axle/bore Ø (20 mm) and thickness (21 mm) before ordering.
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Intended for rope up to 16 mm; for wire use the corresponding Antal wire-specific sheaves.
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