Antal Aluminium Sheave OPF 120 mm
A genuine Antal replacement sheave for OPF (One-Piece Frame) blocks. The 120 mm aluminium sheave runs on a low-friction composite fibre radial bearing with self-captive Delrin® side balls, delivering smooth rotation under heavy loads with no lubrication required. Supplied with a ground stainless-steel hub for precise alignment and long service life, it’s ideal for refreshing OPF blocks or creating custom high-load turning 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 stand up to salt, UV and grit.
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Drop-in fit: built around Antal’s OPF architecture for quick swaps and consistent performance.
Key specifications
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Sheave Ø: 120 mm
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Max rope Ø: 18 mm
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Safe Working Load (SWL): 5,000 kg
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Thickness (T): 25 mm
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Axle/bore Ø (D3): 24 mm
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Hub Ø (D2): 30 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: ~420 g
Typical applications
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Refurbishing Antal OPF 120 mm single, pad-eye, stand-up and deck-mounted 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 (120 mm), axle/bore Ø (24 mm) and thickness (25 mm) before ordering.
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Intended for rope up to 18 mm; for wire, use the corresponding Antal wire-specific sheaves.
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