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The Ultimate Harken Sheave - Big Boat - Sheave Dia: 5 1/2 In (140.0 Mm) (519) Upgraded Model [Lqlgm1Y5]

$63.99 $204.99 -69%

Big Boat sheaves are available for special applications as well as for replacement sheaves in Big Boat blocks. Made of hardcoat-anodized, PTFE-impregnated 6061-T6 aluminum, sheaves feature Torlon® rollers to carry high radial loads and carbon-black D

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The Ultimate Harken Sheave - Big Boat - Sheave Dia: 5 1/2 In (140.0 Mm) (519) Upgraded Model [Lqlgm1Y5]

Big Boat sheaves are available for special applications as well as for replacement sheaves in Big Boat blocks. Made of hardcoat-anodized, PTFE-impregnated 6061-T6 aluminum, sheaves feature Torlon® rollers to carry high radial loads and carbon-black Delrin® balls to support sideloads and provide UV protection.

Delrin® is a registered trademark of E. I. du Pont de Nemours and Company or its affiliates.
Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.

Our Part # HAR519 | Mfr. Part # 519

What Our Customers Say

January 16, 2026

Absolutely no complaints!

It’s a very smart and exceptionally great-made gadget.

- Rheinallt B..

January 16, 2026

Absolutely no complaints!

I'm happy with this product and its great purchase.

- Gaenor O..

January 16, 2026

Absolutely no complaints!

The quality far exceeds the price tag.

- Rhiannon W..

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