Dimensions of Rocna Anchors Rocna Anchor - Galvanized Steel
Rocna Anchor

Rocna Anchor - Galvanized Steel

Superior New Generation Roll-Bar/Scoop Design

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Sleep well at night. The Rocna is the best multi-purpose anchor on the market — rapidly setting and holding in virtually all situations and seabeds, eliminating the need to carry a variety of anchors.
No matter how it hits the bottom, the Rocna anchor always attains its correct setting attitude for quick seabed penetration.
Independent tests by publications such as Cruising World, Practical Sailor, and SAIL (10/06) show that the new-generation roll-bar/scoop style Rocna anchor consistently outperforms more traditional anchor designs in a variety of seabeds.

All of the Rocna's weight is efficiently used in structural strength and extra blade area - rather than a dedicated tip weight - so it offers better anchoring security with less weight.
When you handle this anchor, you will appreciate Rocna's quality workmanship and attention to detail - from high quality welds to chamfering the edges of the shank for aesthetics and ease of handling.

• Suitable for large yachts, workboats, and small ships... down to small runabouts; models from 9 lb to over 600 lb
• Sharp, chisel-like tip easily penetrates difficult weed, grass, and kelp
• Superior holding power - large surface area scoop-like blade outperforms equivalent weight plow, claw, or even some Danforth types in soft sand or mud
• Roll-bar ensures that the anchor will turn itself to the correct attitude for setting, every time; skid-rails then correctly angle the tip for reliable bottom penetration
• High weight-on-tip provides instant setting - typically within three feet
• Resistant to wind and tide shifts - remains embedded, and does not roll out with changes in the direction of pull
• Self-launches, and self-stows on most bow rollers, preventing movement at sea
• Slotted attachment point allows the head of a shackle to pass - so the maximum size shackle that will fit the chain can be attached directly to the anchor
• Truly functional, low-positioned attachment hole for tandem anchoring in extreme conditions
• High attachment hole for a buoyed retrieval line, if required
• Tempered 800 mPa high tensile steel virtually eliminates deformation
• No moving parts - eliminates potential failure points and hazards to the crew
• Hot dip galvanized finish protects the entire surface, including the interior of the hollow rollbar
• RINA certified for Super High Holding Power (SHHP) for full range of anchors
• Lifetime warranty against breakage or deformation

Selecting a Rocna anchor
To select the proper size Rocna anchor for your boat, mouse over the sizing chart image to the left, then click on the upper image to permanently enlarge it.

Note that to get the best fit your vessel's length and displacement are used to determine the anchor size:
Find your vessel’s overall length in the column on the left, then track across that row toward the right until you find the first column with a displacement (in pounds) the same or larger than the displacement of your vessel.
Track upward to the top of that column for the recommended Rocna anchor size.
The rows at the bottom of the chart give equivalent anchor weights in pounds and kilograms, recommended chain sizes, and fluke areas.
If in doubt about the proper size, give preference to the larger anchor model. Relatively high displacement or high windage vessels should choose a larger anchor, while a smaller anchor may be appropriate for especially light displacement boats.
Multi-hulls, with their very high windage, should size as though for a monohull, then choose an anchor one size larger.

The Rocna sizing chart is conservative. Unlike other manufacturers, Rocna sizing recommendations are intended to provide an anchor adequate for use in most all conditions. Calculations are based on 50 knots of wind, associated surge, and soft, moderate holding bottom conditions into which the anchor has set. Adequate scope is assumed. These recommendations provide holding power in excess of that typicallly recommended by other manufacturers...but you will sleep better at night.

As always, note that this chart is a guideline only, and if you have questions, or would like further information, please call us at 800-426-6930.

Heavy on the technical side...

Rocna does not provide anchor size recommendations for boats larger than those for which the 110 kg (243 lb) anchor would be the recommended size. This is because of increasing complexities in the factors involved.
Furthermore, classification society rules, and/or legal requirements, are likely to dictate the anchor sizes mandated for these vessels. Please call us if you need more information at 800-426-6930.

Will it fit my boat?
There are a number of resources to help you answer this question:
• Dimension drawings and full scale patterns are available to evaluate fit dimensions.
• The Rocna Knowledge Base (at www.rocna.com) provides a wealth of information. Look under The Range/Fitting a Rocna on Your Boat - Rocna Bow Compatibility and also Bow Roller Design.
• CAD files are also available for architects, boat builders or service yards to support the integration of a Rocna into your boat’s ground tackle system.
Please contact Fisheries Supply at 800-426-6930 for assistance accessing ANY of these resouces.
Reviewed by4customer 
Sleep Easy, July 14, 2014
We anchored in a bay known to be problematic for kelp. It set immediately and solid. Throughout the rest of the day and evening we watched many boats try and try again to set their Danforths and CQR's only to give up and leave. I thought maybe we had luckily dropped on a sandy patch. The next morning we motored over it, raised chain and broke it free easily. When it broke clear of the surface it had a FOREST of kelp on it! Took me almost 15 minutes to clear. We didn't find any sandy patch. It had just buried right through the kelp. Only drawback is the roll bar is not bowsprit friendly.
By Full Keel from Port Orchard, WA
Great Anchor, July 07, 2014
I got the 20kg galvanized version in 2008 for my 38' Benenteau. It's held in severe storms and heavy seaway. In anything but soft mud it sets very quickly (within 3 feet every time when the water was clear enough to dive it).
By johey from Chesapeake Bay, MD
Rocna Works well for me, December 27, 2013
I love this anchor. Have a 15 kg on a 32 GB and it is by far the best anchor I have had compared to CQR and Bruce type. Sets quickly and holds well at 3:1, a necessity in crowded anchorages. Go to 5:1 in heavy blow. Has never pulled out and self launches when anchoring.
By Tim from Seattle
Rocna is best, January 06, 2013
The only anchor to own when dark clouds haunt and you are away with the shore girl. It's no Sunday afternoon lunch type maybe, I have several types. Like the Bruce but if I leave the boat this is my solid and true friend in a storm. Pays to have a trick getting it up like a second line and buoy but if the tide shifts this one isn't going to pack up on you. It's the best to reset. Is the cost worth it? Depends on what your boat's worth and the EPA clean up on the beach...
By Will from San Francisco
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