The Vulcan is Rocna’s first major design development since the launch of the highly successful and acclaimed Rocna anchor itself.

Following on the success of the Rocna, designer Peter Smith was often approached by customers seeking to experience the exceptional holding power and setting performance of a Rocna, but who had difficulties accommodating the roll-bar design on their bow. After years of testing and development, Peter has come up with a design that meets the needs of these customers – the Vulcan.

Vulcan: An inheritance of genuine performance

The Vulcan capitalizes on finely tuned design elements from the Rocna pattern, infusing proven Rocna performance advantages for an extremely quick and reliable set across a range of seabeds combined with the expected Rocna holding power.

NEW SOLUTIONS FOR OLD CHALLENGES: Breaking from the Rocna design, the Vulcan features a unique and patented shank and fluke geometry – including the innovative roll-palm™ (A) at the rear of the fluke – which self-rights the anchor on the seabed without the use of a roll-bar. This is assisted by the V-bulb™ (B) which extends fluke ballast downward to gain maximum leverage and efficiency. This development permits a larger fluke surface area than competing designs which rely on simple dead weight, while the concave fluke (C) is similar in design to the Rocna.

FIT FOR ALL VESSELS – AND THEIR OPERATORS: No roll-bar and a carefully designed shank profile (D) ensures a snug fit on the bows of a widely expanded range of vessels. Platforms, bowsprits, prods, stays, and other protrusions are cleared with less inconvenience.

SMOOTH BOW INTERACTION & COMPATIBILITY:The Vulcan’s shank shape (E) encourages self-launching and self-stowing upon retrieval on the majority of bow rollers, with a liquid smooth action, ensuring ease of use for all operators.

STRENGTH FROM SOPHISTICATED DESIGN: Working with high tensile steel, the Vulcan shank (E) is further strengthened by our patented I+V profile™ design. This computer optimized I-beam geometry brings higher resistance to bending, and further improves setting performance as the lower V-edge cuts into the seabed. This helps the anchor penetrate more easily to a deep and secure burial.

IN THE IMAGE OF THE GODS: Embodying the rugged strength and elegant designs of its namesake – the ancient god of fire and metal smithery – the Vulcan shares the heritage of the Rocna anchor and is born of innovation.

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.

Vulcan 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 55 kg (121 lb) at the orientation pictured. Using these drawings and a tape measure, many boaters can easily determine that a Vulcan anchor will fit their boat.

Click here to download full-scale patterns.

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

Vulcan Dimensions

SIZE     A     B     C     D     E     S     Width     
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.

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

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

“We have a 65’ houseboat on Old Hickory Lake, part of the Cumberland River system. We typically boat with several friends with 70’ to 100’ houseboats. Most of these use a Fortress or Danforth-style anchor. Often we may have 6 to 8 boats tied together. Usually light wind and very little current. But that said, we almost always have to reset the anchor or anchors every weekend. Sometimes 2-3 times! So far, that has changed with my new Vulcan anchor. It sets instantly and holds!”

— Paul Barlar, Vulcan 44 on a 65′ Houseboat


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

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 10 sizes from 4 kg (9 lb) to 55 kg (121 lb) to suit vessels from small runabouts to larger launches.

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.

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