A rope clutch operates much like a jammer but with one key difference: it can release a line while the line is still under load. The core difference is load release: a rope clutch can be opened and let a line run while it is still under load, whereas a jammer cannot be released under load — you must first take the load onto a winch, then lift the jammer handle. MAURIPRO Sailing stocks Spinlock and Antal and Lewmar rope jammer options, listed in Spinlock sailboat rope clutches.
Rope jammer at a glance
| Product | Brand | What it is for |
|---|---|---|
| Spinlock Rope Clutch - Single XAS - Line Size: 1/4 to 1/2 in (6 to 12 mm) | Spinlock | The Spinlock Rope Clutch #XAS0612/1 is a versatile tool designed for superb performance across a range of rope diameters from 1/4 to 1/2 inches. |
| Antal Rope Clutch - Single CAM 611 - Line Size: 1/4 to 3/8 in (6 to 10 mm) | Antal | It's designed to handle line sizes from 1/4 to 3/8 inches, allowing for flexibility when changing lines. |
| Lewmar Rope Clutch - Single DC1 - Line Size: 3/8 to 1/2 in (10 to 12 mm) | Lewmar | Its Domino mechanism flexes the line instead of jamming it, for a secure hold with less line wear. |
What does a rope jammer actually do?
A rope jammer holds a loaded line in position so the crew doesn't have to keep tension on it by hand or tie up a winch, freeing the winch for the next job while the sail stays trimmed. To release the line, you first take the load onto a winch; once the load is off the jammer, lifting the handle frees the rope. The Spinlock XTR Rope Clutch Handle (5/16–1/2 in / 8–12mm line) shows the clutch side of this same mechanism: an ergonomic lever lets you open a loaded clutch single-handed for controlled release even while it's still under load.
How do you match a rope jammer to your boat?
As a rule, rope diameter should increase with boat length, displacement, and line load. Among the models MAURIPRO stocks, the Antal CAM 611 covers 1/4 to 3/8 in (6 to 10 mm) lines, the Spinlock XAS covers 1/4 to 1/2 in (6 to 12 mm), and the Lewmar DC1 covers 3/8 to 1/2 in (10 to 12 mm) — match the jammer to the actual diameter of the halyard or control line you're running, not just the biggest unit available.
What separates the rope jammer options we stock?
Spinlock Rope Clutch - Single XAS - Line Size: 1/4 to 1/2 in (6 to 12 mm)
The Spinlock Rope Clutch #XAS0612/1 is a versatile tool designed for superb performance across a range of rope diameters from 1/4 to 1/2 inches. Ideal for sailing enthusiasts, it's a reliable addition to your gear without any fuss.This rope clutch is crafted to ensure optimal clutching and holding power, especially in demanding sailing conditions.
Antal Rope Clutch - Single CAM 611 - Line Size: 1/4 to 3/8 in (6 to 10 mm)
This clutch is compact yet efficient, providing automatic line pressure with a simple pull. This Antal Rope Clutch features a flat cam made from chromed brass, ensuring durability and longevity. The design allows for straightforward line changes without needing additional mounting screws, making it an essential tool for sailors.
Lewmar Rope Clutch - Single DC1 - Line Size: 3/8 to 1/2 in (10 to 12 mm)
With its innovative Domino mechanism, it flexes the line instead of jamming it, ensuring a better grip and longevity.
What build details matter on a rope jammer?
A Dyneema halyard may reach the required strength at 8mm, but the thin, low-friction rope is harder to grip and more easily damaged by aggressive cam teeth.
What else decides the choice?
To remove a line from a jammer you first take the load onto a winch; once the load is off the jammer, the handle can be pulled and the rope released. High-load jammers often incorporate clutch-like release features regardless of their name, because poor release behavior becomes more dangerous as loads climb. The deciding question is whether you ever need to dump the line quickly under full load — if yes, a clutch; if the line simply sits loaded and is released off a winch, a jammer. Spinlock XX Pre-Load Moulding (Standard Operation) — an internal component of the heavy-load XX jammer that governs how smoothly the jaw releases under tension.
Which should you choose?
- Spinlock Rope Clutch - Single XAS - Line Size: 1/4 to 1/2 in (6 to 12 mm) — The Spinlock Rope Clutch #XAS0612/1 is a versatile tool designed for superb performance across a range of rope diameters from 1/4 to 1/2 inches.
- Antal Rope Clutch - Single CAM 611 - Line Size: 1/4 to 3/8 in (6 to 10 mm) — It's designed to handle line sizes from 1/4 to 3/8 inches, allowing for flexibility when changing lines.
Frequently asked questions
What should you check first when buying a rope jammer?
Start with the line diameter range: a jammer only grips well within its rated range, so check your halyard or sheet's actual diameter against the unit's spec (for example, the Antal CAM 611 covers 1/4 to 3/8 in / 6 to 10 mm, while the Spinlock XAS covers 1/4 to 1/2 in / 6 to 12 mm). Then decide whether you need controlled release under load — if so, choose a clutch rather than a jammer.
What size rope jammer fits your boat?
Match the jammer's rated line-size range to the actual diameter of the halyard, sheet, or control line you're running, and size up as boat length, displacement, and line load increase. Among the models MAURIPRO stocks: the Antal CAM 611 (1/4–3/8 in / 6–10 mm), the Spinlock XAS (1/4–1/2 in / 6–12 mm), and the Lewmar DC1 (3/8–1/2 in / 10–12 mm).
What is a rope jammer made of?
Construction varies by brand and model: the Antal CAM 611 uses a toothed flat cam made from chromed brass, while the Lewmar DC1 relies on its Domino mechanism to flex the line rather than jam it, reducing line abrasion.
How is a rope jammer mounted or set up?
Rope jammers mount to the deck or coaming with through-bolts or screws — the Antal CAM 611, for example, uses two 6 mm fixing screws — and are positioned so the line runs straight through the jaw. To release a loaded line, you first take the load onto a winch, then lift the handle to free the rope.
What load can a rope jammer take?
Load capacity depends on the model: the Antal CAM 611 is rated to 500 kg (MWL), the Lewmar DC1 to 500 kg / 1,100 lb (WLL), and the Spinlock XAS to about 575 kg — so match the jammer to the loads your halyard or sheet will actually see.
Where can you buy a rope jammer?
Shop Spinlock sailboat rope clutches →
Shop Antal hardware rope clutches →
Shop Lewmar rope clutches jammers →
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Last updated: September 22, 2026.
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