Lewmar's DC1 clutch tops out at a 500 kg working load on 6-12 mm line, while the DC2 steps up to 1,000 kg on 12-14 mm line — both use the same Domino Cluster mechanism to grip rope without cam teeth. MAURIPRO stocks single, double, and triple banks of both series, sized to your halyard or sheet.
If you've searched for a "Lewmar double clutch" while sorting out deck hardware, you've probably landed on a wall of near-identical black housings labeled DC1 and DC2, each sold as Single, Double, or Triple. The names don't tell you much on their own — DC1 and DC2 are Lewmar's two rope clutch series, and Single/Double/Triple just tells you how many lines share one mounting base, not which series you need.
This guide is written for the 30-45 ft cruiser working out which Lewmar clutch goes where — a DC1 bank for the reefing line and cunningham, a DC2 for the primary halyard that actually loads up under sail. We'll cover what separates the two series, how Lewmar's Domino Cluster mechanism grips a line differently than a cam clutch, and how to pick the right size and bank configuration.
Lewmar DC1 vs. DC2 rope clutches at a glance
| Clutch | Line size | Min. holding load | Price |
|---|---|---|---|
| Lewmar DC1 Single, 10-12mm | 3/8-1/2 in (10-12 mm) | 500 kg (1,100 lb) | $93.95 |
| Lewmar DC1 Double, 10-12mm | 3/8-1/2 in (10-12 mm) | 500 kg per line | $163.00 |
| Lewmar DC1 Triple, 10-12mm | 3/8-1/2 in (10-12 mm) | 500 kg per line | $233.00 |
| Lewmar DC2 Single, 12-14mm | 1/2-9/16 in (12-14 mm) | 1,000 kg (2,204 lb) | $127.00 |
| Lewmar DC2 Double, 12-14mm | 1/2-9/16 in (12-14 mm) | 1,000 kg per line | $226.00 |
| Lewmar DC2 Triple, 10-12mm | 3/8-1/2 in (10-12 mm) | 700 kg per line | $325.00 |
What's the actual difference between the Lewmar DC1 and DC2 series?
Both series share the same mechanism and the same black housing style, so the real difference is load capacity and line range, not how they work. The DC1 is Lewmar's low-load series: it's sold in 6-8 mm, 8-10 mm, and 10-12 mm sizes, and every DC1 — regardless of size — carries the same flat 500 kg (1,100 lb) working load limit. The DC2 is the high-load series: sold in 8-10 mm, 10-12 mm, and 12-14 mm sizes, with the minimum holding load climbing as the line gets bigger, from roughly 500 kg at 8-10 mm to 1,000 kg (2,204 lb) at the top of its 12-14 mm range.
The DC2 housing is also physically larger — 156 mm long by 38 mm wide on a single, versus 126 mm by 32 mm for a DC1 single — and retailers consistently position it for boats above roughly 33 ft, where sheet and halyard loads outgrow what a DC1 can hold. On a smaller boat with modest control-line loads, that extra size and cost buys you headroom you may not need.
How does the Domino Cluster mechanism grip a line differently than a cam clutch?
Most rope clutches — including the Antal and Spinlock models MAURIPRO covers elsewhere in this blog — use a toothed cam that pinches the line against a fixed base. Lewmar's DC1 and DC2 do something different: a row of smooth, hinged rings (the "Domino Cluster") sits in line with the rope. Pulling the handle back tilts the rings, and the line snakes through the tilted rings under tension, generating grip across a much larger surface area than a single cam tooth-line. Releasing the handle lets the rings straighten and the line ease out gradually, rather than popping free the instant a cam disengages.
The practical upside is less rope wear — there's no row of teeth biting into the cover — and a genuinely controlled release under full load, which matters most on a loaded spinnaker halyard or a reefing line you're easing rather than dumping.
How do you size a DC1 or DC2 clutch to your line diameter and load?
Start with the line, not the clutch. Measure the actual diameter of the halyard or sheet you're running, then pick the size band that puts your line diameter toward the top of the clutch's stated range — a 10 mm line in a clutch rated 10-12 mm grips better than the same line in a clutch rated 8-10 mm, because the Domino rings need enough rope cross-section to flex against.
Next check load, not just diameter. A thin, high-modulus Dyneema-core line can carry more working load than a same-diameter polyester double-braid, so a small-diameter racing halyard can outrun a DC1's 500 kg ceiling even though it physically fits the jaws. If your calculated working load is anywhere near a DC1's 500 kg limit, move up to a DC2 rather than running at the edge of the rating.
Single, double, or triple — how many lines should one Lewmar clutch bank handle?
Both series build out the same way: a Single is one Domino Cluster and one handle; a Double and Triple are two or three complete, independent mechanisms sharing one mounting base — not one mechanism split across multiple lines. That means a Double DC1 still holds 500 kg per line, and a Triple DC2 still holds its full per-size rating on each of its three lines; banking more stations doesn't cost you working load per line, only deck space and cost.
Banking makes sense when several control lines route to the same winch — a reefing line and an outhaul that are rarely tensioned at the same time, for example — so one winch and one clutch bank can serve both without a dedicated station for each. Keep DC1 and DC2 banks separate: they don't share a common baseplate, so you can't mix a low-load and high-load station in a single housing.
Which should you choose for your boat?
For a mid-size cruiser in the 30-45 ft range, a practical split is: run DC1 banks on the lines that see moderate, steady loads — reefing lines, a cunningham, a boom vang control line, an outhaul — and reserve DC2 for whichever line actually spikes hardest under sail, most often the primary halyard or a genoa/jib sheet lead that shares a winch. If you're re-fitting a boat that's already at the larger end of that range, or you sail with a smaller crew and load lines harder before easing them, lean toward DC2 across the board rather than mixing series to save a little on cost.
If you're simply replacing a like-for-like clutch, match the series first — a failed DC1 gets replaced with a DC1 of the same line size, not "upgraded" to a DC2 without checking that the larger footprint still fits your existing mounting holes.
Expert notes from the rigging bench
"We size DC2 by the line that spikes hardest, not the average load on deck. A boat can run DC1 on every other control line and still need one DC2 station for the primary halyard alone."
"The Domino mechanism is genuinely gentler on Dyneema covers than a toothed cam — we've pulled DC-series clutches off boats after several seasons with almost no visible cover wear at the grip point, which isn't something we can say for every cam-type clutch we've serviced."
"Don't assume the handle from an old clutch will fit its replacement. Lewmar sells separate handle kits for the DC1 and DC2 series — they're not interchangeable, even though they look similar from a few feet away."
Common mistakes to avoid
- Assuming "double" means DC2. The real Bing search that prompted this guide, "lewmar double clutch," is ambiguous on purpose — both DC1 and DC2 come in a Double configuration. The series (DC1 vs. DC2) is about load, not line count.
- Sizing to the smallest line that physically fits. A clutch grips best near the top of its rated range, not the bottom — undersizing costs you holding power exactly when you need it most.
- Mixing handle kits between series. DC1 and DC2 handle kits are sold separately and aren't interchangeable; order the kit that matches your existing clutch's series.
- Ignoring line construction. A high-modulus line can outload a DC1 well before it looks "too big" for the jaws — check working load, not just whether the rope fits.
Frequently asked questions
What's the difference between a Lewmar DC1 and DC2 rope clutch?
The DC1 is Lewmar's low-load series, built for 6-12 mm line with a flat 500 kg working load limit across every size. The DC2 is the high-load series, built for 8-14 mm line with the minimum holding load scaling up to 1,000 kg at 12-14 mm. Both use the same Domino Cluster mechanism; the difference is capacity and size, not how they grip the line.
Can I mix a DC1 and DC2 in the same clutch bank?
No. DC1 and DC2 stations don't share a common baseplate, so a Double or Triple bank has to be all-DC1 or all-DC2. If you need one low-load and one high-load line at the same location, mount separate DC1 and DC2 units side by side instead.
What line size fits a Lewmar DC2 clutch?
DC2 clutches are sold in three line-size bands: 8-10 mm, 10-12 mm, and 12-14 mm, each as a Single, Double, or Triple. Pick the band where your actual line diameter sits toward the top of the range for the best grip.
Are Lewmar DC1 and DC2 handle kits interchangeable?
No — Lewmar sells separate handle kits for each series. When replacing a worn handle, match it to the clutch series you already have rather than assuming any Lewmar rope-clutch handle will fit.
Do I need a DC2 for a 40 ft cruiser?
Not on every line. A 40-footer typically has some lines — reefing lines, an outhaul, a cunningham — that stay well within a DC1's 500 kg limit, and one or two lines, usually the primary halyard or a genoa sheet, that are worth stepping up to a DC2 for. Sizing by line, not by boat length, keeps you from over- or under-buying.
Recommended gear
Lewmar DC1 Single, 10-12mm — the low-load entry point, 500 kg, for reefing lines and outhauls.
Lewmar DC1 Double, 10-12mm — two 500 kg stations sharing one base and one winch.
Lewmar DC2 Single, 12-14mm — the high-load option, 1,000 kg, for a primary halyard.
Lewmar DC2 Double, 12-14mm — two full-load stations for a halyard and a sheet sharing a winch.
Shop all Lewmar rope clutches & jammers →
You may also be interested in
- How Does a Rope Clutch Work?
- Which Rope Clutch Do You Need for Your Halyard or Sheet Diameter?
- What's the Difference Between Antal's CAM 611 and V-CAM Rope Clutches?
Last updated: September 10, 2026.