M1 anchor digs in like no other anchor

Mantus Marine

M1 galvanised



The Mantus M1 Anchor digs in like no other anchor. It has been designed to penetrate dense, grassy bottoms and set with unparalleled holding power. When tested, Mantus Anchors set faster and deeper than any other tested anchor including; Rocna, Manson Supreme, Bulwagga, Fortress, Bruce, CQR and Danforth anchors.


The Mantus M1 Anchor line up simply has the best boat anchors available, whether you are a long-range cruiser, racing or going out for a day sail. The Mantus quick-set anchor is stowable and breaks down for easy storage, so you can store one or two as spares without taking up much needed boat space.


  • Formed out of high-quality steel plate. Contains no cast parts.
  • Shank and shank boot are welded from top and bottom.
  • Shank and roll bar are bolted to the fluke.
  • ASTM certified steel bolts are oversized with a large margin to ensure safety.
  • Although the shank is attached to the fluke with 4 bolts, a single bolt has sufficient strength to handle the maximum expected load on the anchor. 
  • In the carbon steel version every part of the anchor system is hot-dipped galvanised for corrosion protection. (All shanks are HT ASTM 514 steel and flukes are mild steel A36 equivalent)
  • Sharp-headed nose is precision machined to achieve the perfect chisel shape to achieve maximum penetrating power.


After the release of the Mantus M2 Model we often get the question: Which one is better? 

Both Anchors have an amazing setting and resetting ability and both are excellent choices for a primary anchor, but each has its own small specific advantages.

Both anchors roll over well in most bottom conditions and it is rare for a properly weighted anchor to end up upside down, nevertheless M1 Anchor due to its roll bar is better at rolling over in a really soft silty bottom.

The M2 Anchor is less likely to get plugged up with muddy weeds and, without the need for the roll bar, the M2 is less bulky. Thus the M2 Anchor provides a better fit for boats with bow pulpits with slotted anchor housing and bow sprits.

Mantus M1 Anchor exploded


2.5 lbs1710.
8 lbs2213.
13 lbs2615.918.
17 lbs2917.520.
25 lbs3119.
35 lbs3521.
45 lbs3923.727.
55 lbs4225.429.410.
65 lbs4527.031.410.
85 lbs4728.733.311.
105 lbs5131.
125 lbs5533.438.813.
155 lbs6337.944.014.911.
175 lbs6740.547.0
1.1 kg42725930010281207236156105
3.6   kg546331384130103259302200135
5.9   kg6664034681581263111368243164
7.7   kg7354465171751393412407269181
11.4 kg7954825591891503713440290196
15.9 kg8845366222101674115489323218
20.5 kg9936026992361884617550363245
25.0 kg10636447472532014918588388262
29.5 kg11326877962692145319627414279
38.6 kg12027298452862275620665439296
47.7 kg13017899153092466122720475321
56.8 kg14018499853332656523775512345
70.5 kg158996411183783017426879581392
79.5 kg1699103011944043217928940621419

When making sizing recommendations for a working anchor we are generally referring to the needs of a cruising boat spending most of its time on anchor. In doing so we try to envelope high sustained winds (50 kts) and assume poor holding conditions (low viscosity bottoms). Some may think these recommendations to be too conservative especially when compared to sizing tables from other manufacturers.

Companies often make claims of superior anchor efficiency, stating that their small anchor X will outperform a much heavier anchor from their competitors and often use sizing charts as a marketing tool to that end, recommending anchors and anchor systems that are dangerously undersized for their intended use. Comparing surface area can be a good judge for potential holding capability.

Our anchor sizing recommendations are presented in the table below and divided in three categories: Lunch Anchor category is recommended for lighter use, expected winds under 30 knots, working anchor for winds under 50 knots and finally, storm anchor recommendations are intended for winds above 50 knots. These recommendations are made assuming the worst-case scenario, a poor holding bottom and thus may seem conservative but we believe are accurate.

Anchor Size KGDay Anchor Recommended for winds <30 knotsCruising Anchor recommended for winds<50 knotsStorm Anchor recommended for winds >50 knotsBlade Surface Area cm/2
1kg0-5 meters <460kg  160
3.5kg5-6 meters <1400kg0-5 meters <460kg0-3.6 meters <360kg380
6kg6-7.5 meters <2,300kg5-6 meters <1400kg3.6-5 meters <460kg570
8kg7.5-9 meters <5,000kg6-7.5 meters <2,300kg5-6 meters <1400kg680
11.4kg9-10.6 meters <6,800kg7.5-9 meters <5,000kg6-7.5 meters <2,300kg800
15kg10.6-12 meters <9,090kg9-10.6 meters <6,800kg7.5-9 meters <5,000kg1000
20kg12-13 meters <13,600kg10.6-12 meters <9,090kg9-10.6 meters <6,800kg1260
25kg13-13.5 meters <18,200kg12-13 meters <13,600kg10.6-12 meters <9,090kg1400
30kg13.5-15.2 meters <23,000kg13-13.5 meters <18,200kg12-13 meters <13,600kg1640
39kg15.2-18.2 meters <27,000kg13.5-15.2 meters <23,000kg13-13.5 meters <18,200kg1840
48kg18.2-21.2 meters <32,000kg15.2-18.2 meters <27,000kg13.5-15.2 meters <23,000kg2160
57kg21.2-24.2 meters <45,500kg18.2-21.2 meters <32,000kg15.2-18.2 meters <27,000kg2500
70kg24.2-27.3 meters <50,500kg21.2-24.2 meters <45,500kg18.2-21.2 meters <32,000kg3190
80kg27.3-30.3 meters <59,000kg24.2-27.3 meters <50,500kg21.2-24.2 meters <45,500kg3641


Anchor Size LBSDay Anchor Recommended for winds <30 knotsCruising Anchor recommended for winds<50 knotsStorm Anchor recommended for winds >50 knotsBlade Surface Area cm/2
2.5 lbs0-16 feet <1,000 lbs  160
8 lbs16-20 feet <3,000 lbs0-14 feet <1,000 lbs0-12 feet <800 lbs360
13 lbs20-25 feet <5,000 lbs16-20 feet <3,000 lbs12-16 feet <1,000 lbs570
17 lbs25-30 feet <11,000 lbs20-25 feet <5,000 lbs16-20 feet <3,000 lbs680
25 lbs30-35 feet <15,000 lbs25-30 feet <11,000 lbs20-25 feet <5,000 lbs800
35 lbs35-39 feet <20,000 lbs30-35 feet <15,000 lbs25-30 feet <11,000 lbs1000
45 lbs39-43 feet <30,000 lbs35-39 feet <20,000 lbs30-35 feet <15,000 lbs1260
55 lbs43-45 feet <40,000 lbs39-43 feet <30,000 lbs35-39 feet <20,000 lbs1400
65 lbs45-50 feet <50,000 lbs43-45 feet <40,000 lbs39-43 feet <30,000 lbs1640
85 lbs50-60 feet <60,000 lbs45-50 feet <50,000 lbs43-45 feet <40,000 lbs1840
105 lbs60-70 feet <70,000 lbs50-60 feet <60,000 lbs45-50 feet <50,000 lbs2160
125 lbs70-80 feet <100,000 lbs60-70 feet <70,000 lbs50-60 feet <60,000 lbs2500
155 lbs80-90 feet <110,000 lbs70-80 feet <100,000 lbs60-70 feet <70,000 lbs3190
175 lbs90-100 feet <130,000 lbs80-90 feet <110,000 lbs70-80 feet <100,000 lbs3641

Assembly Instructions

Bolts, Washers and Nuts are provided with every Mantus Anchor. In the event of replacing a lost fastener, please make sure to always use proper size. Always use locking washers, or nylon lock nuts, and tighten the nut securely.