Rocna anchors are performing in some of the world’s toughest locales: Patagonia, Alaska, temperamental tropical weather in remote coral atolls – and most importantly, your local favorite weekend anchorage.


The original highly successful New Zealand design, Peter’s tested and proven solution is the economical and rock solid choice for use anywhere on the planet and on any vessel.


Rocna anchors are performing in some of the world’s toughest locales: Patagonia, Alaska, temperamental tropical weather in remote coral atolls – and most importantly, your local favorite weekend anchorage. Rocna is trusted by respected boaters, from Jimmy Cornell to Skip Novak to Jérôme Poncet.

PRECISION SETTING: The Rocna roll-bar™ (A) ensures the anchor always arrives at the ideal angle for penetration, and the skids (B) guide the fluke tip (D) which chisels into the seabed. An instant reliable set is secured with every use.

ROCK SOLID HOLDING POWER: A concave fluke (C) gives the greatest resistance. In soft seabeds, this provides the secure holding power you need. On hard or weedy sea floors, Rocna’s chisel tip (D) cuts through and bites deep.

HIGH TENSILE STEEL SHANK (E): Rocna anchors are designed – and built – for strength and durability.

RESISTANT TO WIND AND TIDE SHIFTS: All Rocna anchors remain stable and buried, and fight roll-out on veering of pull, or if dragged beyond holding ability, providing enhanced security whatever the circumstance.

MAXIMUM VERSATILITY: Rocna anchors are true multi-purpose anchors that set and hold in most seabeds, from soft mud to hard sand, clay, grass, and kelp.

SELF-DEPLOYING AND SELF-RECOVERING: The Rocna shank is designed so the anchor self-launches and self-stows on the majority of bow-rollers, with the greatest possible reliability.

TANDEM ANCHORING ATTACHMENT POINT: For extreme adventurers to extend their horizons even further.

SOLID STEEL: One-piece design for crew safety, ease of use, and simplicity of maintenance.

FINISH OPTIONS: Hot-dip galvanized coating for economical durability, or mirror-polished stainless steel for ultimate aesthetics and extended service life.

Rocna Original Dimensions 

To ensure that your new anchor will fit well on your boat’s bow, we offer a number of resources to assist you.

Commonly requested measurements are tabulated below for anchors up to 110 kg (243 lb) at the orientation pictured. Using these drawings and a tape measure, many boaters can easily determine that a Rocna or Vulcan will fit their boat.

Click here to download full-scale patterns.

For 3D or 2D CAD files, please contact us.

Rocna Original dimensions drawing

Rocna Original Dimensions

>110see below
For dimensions and fit support for models Rocna Original 150 (331 lb) and larger, please contact us.

Rocna Anchors Sizing Guidelines

There’s a Rocna anchor to suit just about any vessel. To choose the correctly sized Rocna Original or Vulcan anchor, find your vessel’s length from column on the left, then track across that row until you find the first column with a displacement (in tonnes) the same or larger than the displacement of your vessel. The top of the column with the selected displacement indicates the recommended Rocna Original or Vulcan.

For multihulls: use the chart as instructed, then select the model one size larger.

Download Rocna Original/Vulcan Sizing Guidelines Chart.
Download Complete Rocna Anchors Sizing Guide.

Rocna Original Or Vulcan Sizing Chart Metric Tonnes

VesselLengthVulcan onlyRocna Orig. onlyVulcan onlyRocna Orig. onlyRocna Orig. only
4 m13 ft≤ 2 t
5 m16 ft≤ 1 t≤ 5 t
6 m20 ft≤ ½ t≤ 3.5t≤ 7 t
7 m23 ft≤ ½ t≤ 2 t≤ 6 t≤ 7 t≤ 9 t
8 m26 ft≤ 1 t≤ 5 t≤ 6 t≤ 8 t≤ 12 t
9 m30 ft≤ ½ t≤ 4 t≤ 5 t≤ 7 t≤ 10 t≤ 16 t
10 m33 ft≤ 3 t≤ 4 t≤ 6 t≤ 8.5 t≤ 14 t≤ 22 t
11 m36 ft≤ 2 t≤ 3 t≤ 5 t≤ 7 t≤ 12 t≤ 20 t
12 m39 ft≤ 4 t≤ 6 t≤ 10 t≤ 18 t≤ 30 t
14 m46 ft≤ 4 t≤ 6 t≤ 13 t≤ 23 t≤ 40 t
16 m52 ft≤ 3 t≤ 9 t≤ 18 t≤ 32 t≤ 60 t
18 m59 ft≤ 5 t≤ 14 t≤ 25 t≤ 50 t≤ 85 t
20 m66 ft≤ 10 t≤ 18 t≤ 40 t≤ 75 t≤ 165 t
22 m72 ft≤ 6 t≤ 12 t≤ 33 t≤ 65 t≤ 150 t
24 m79 ft≤ 7 t≤ 25 t≤ 55 t≤ 135 t
26 m85 ft≤ 18 t≤ 45 t≤ 120 t
28 m92 ft≤ 35 t≤ 105 t
30 m98 ftUse EN*
AnchorWeight4 kg6 kg9 kg10 kg12 kg15 kg20 kg25 kg33 kg40 kg55 kg70 kg110 kg
9 lb13 lb20 lb22 lb27 lb33 lb44 lb55 lb73 lb88 lb121 lb154 lb243 lb
SuggestedG40 chain6mm6mm7mm7mm8mm8mm9mm10mm10mm11mm12mm14mm16mm

“I just wanted you to know how much I appreciate your product. I am in St Maarten and the boat just went through hurricanes Irma which was a direct hit with winds gusting to 250mph, and hurricane Maria right after with winds of 125mph. I had my boat in a marina with my Rocna 44 set on 3/4″ anchor line in about 15 feet of water and that anchor never broke loose. It held through both storms and stopped the bow of my boat from moving in a lateral motion. This probably saved all my dock lines from breaking.

As you may know about 90% of all the boats on the island sank, so I consider myself very lucky. I have owned boats for 35 years and your anchor is the best I have owned so far. Keep up the good work, guys.”

— Rourke Henderson, Rocna 44 on Cheoy Lee 44′


Rocna anchors set fast and hold in all conditions, so you and your family or crew don’t have to be on constant tenterhooks. For the safety of your vessel, and everyone aboard, invest in the best anchor available. The anchor made by those who understand that when the storm hits, you need a rock solid anchor.

High Quality Build and Finish

Compare welds and finish on a Rocna anchor to other alternatives. A top performing product should be built like one, so the Rocna is manufactured with the highest standards of production and quality control to ensure a superior finished anchor.

Wide Competitively Priced Product Range

Available in 14 sizes from 4 kg (9 lb) to 275 kg (606 lb) to suit small boats all the way to bigger ships. Larger sizes are available on request.

Guaranteed for Life

Each anchor comes with a Lifetime Warranty against manufacturing defects plus both breakage and bending.


Dimension drawings and full scale patterns are available here to evaluate fit dimensions.


See our sizing guide for a Rocna anchor to suit just about any vessel.


You can find your Rocha anchor in most places globally. Contact us for remote locations.

WordPress Lightbox