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Engineering Specifications

Technical
Specifications

Detailed engineering specifications for professional-grade diving magnets

Engineering Data

Specification Table

This table covers the 5 single Diving Magnets diver magnets (115–250 kg pull force, N42–N48 neodymium, Epoxy-HDPE sealed, proven to 150 m). The twin magnets (230–500 kg) are in the assembled dimensions table below.

Pot magnet cross-section: D magnetic face diameter, D1 screw hole, D2 countersink, H height; 1 plated steel pot 2 mm, 2 epoxy 20 µm + HDPE 200 µm, 3 neodymium magnet
DMagnetic face Ø
D1Screw hole Ø
D2Countersink Ø
HHeight
1Plated steel pot · 2 mm
2Epoxy 20 µm + HDPE 200 µm
3Neodymium magnet

NdFeB · all models · layers not to scale

ModelAttractionDD1D2HGradeMagnet only (g)SlideFixingTechnical drawing
kgmmmmmmmmkg
Ø60 mm pot
DMS115-CS/P115608.516.521N42388238mm c/s screwDrawing
DMS140-CS/P140608.516.521N48388288mm c/s screwDrawing
Ø78 mm pot
DMS160-CS/P1607810.520.518N424753210mm c/s screwDrawing
DMS200-CS/P2007810.520.518N454754010mm c/s screwDrawing
DMS250-CS/P2507810.520.518N485905010mm c/s screwDrawing

  • DMS115-CS/PØ60 mm pot

    Attraction
    115 kg
    D
    60 mm
    D1
    8.5 mm
    D2
    16.5 mm
    H
    21 mm
    Grade
    N42
    Magnet only (g)
    388
    Slide
    23 kg
    Fixing
    8mm c/s screw
    Drawing

  • DMS140-CS/PØ60 mm pot

    Attraction
    140 kg
    D
    60 mm
    D1
    8.5 mm
    D2
    16.5 mm
    H
    21 mm
    Grade
    N48
    Magnet only (g)
    388
    Slide
    28 kg
    Fixing
    8mm c/s screw
    Drawing

  • DMS160-CS/PØ78 mm pot

    Attraction
    160 kg
    D
    78 mm
    D1
    10.5 mm
    D2
    20.5 mm
    H
    18 mm
    Grade
    N42
    Magnet only (g)
    475
    Slide
    32 kg
    Fixing
    10mm c/s screw
    Drawing

  • DMS200-CS/PØ78 mm pot

    Attraction
    200 kg
    D
    78 mm
    D1
    10.5 mm
    D2
    20.5 mm
    H
    18 mm
    Grade
    N45
    Magnet only (g)
    475
    Slide
    40 kg
    Fixing
    10mm c/s screw
    Drawing

  • DMS250-CS/PØ78 mm pot

    Attraction
    250 kg
    D
    78 mm
    D1
    10.5 mm
    D2
    20.5 mm
    H
    18 mm
    Grade
    N48
    Magnet only (g)
    590
    Slide
    50 kg
    Fixing
    10mm c/s screw
    Drawing

Assembled dimensions (mm)

ModelBuildLengthWidthHeight
DM-115, DM-1401 × Ø60 magnet, M8 eye nut1706061.5
DM-160, DM-200, DM-2501 × Ø78 magnet, M10 eye nut1797867.5
DM-230, DM-2802 × Ø60 magnets, M8 eye nut235.56061.5
DM-320, DM-400, DM-5002 × Ø78 magnets, M10 eye nut2897867.5

  • DM-115, DM-140

    Build
    1 × Ø60 magnet, M8 eye nut
    Length
    170
    Width
    60
    Height
    61.5

  • DM-160, DM-200, DM-250

    Build
    1 × Ø78 magnet, M10 eye nut
    Length
    179
    Width
    78
    Height
    67.5

  • DM-230, DM-280

    Build
    2 × Ø60 magnets, M8 eye nut
    Length
    235.5
    Width
    60
    Height
    61.5

  • DM-320, DM-400, DM-500

    Build
    2 × Ø78 magnets, M10 eye nut
    Length
    289
    Width
    78
    Height
    67.5

Height includes the eye nut.

Technical drawings

Find your model

Choose a Diver Magnet to see its technical drawing. Dimensions in mm; eye nut per DIN 582.

Click the drawing to enlarge

DM-250 · DM-160 · DM-200 · DM-250 — Ø78 single

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NOTE

Note: All specifications are subject to standard tolerances. For detailed dimensional drawings and technical consultation, please contact our sales team. Performance characteristics may vary based on application conditions and surface preparation.

Material Specifications

Neodymium Magnet

GradeN42-N48 High Performance
ShapePot design with counter-bored hole
CompositionNdFeB (Neodymium-Iron-Boron)
CoatingEpoxy-HDPE
Max Operating Temperature80°C
Magnetization DirectionAxial (through thickness)

Steel Housing

Materialplated A3 steel
Corrosion ResistanceThe magnet is sealed in epoxy and HDPE inside a plated steel pot.
Surface FinishBrushed/Polished
Housing Thickness2mm minimum

Eye Nut and Handle

Material316 Stainless Steel
Thread TypeMetric, Right-hand

Application

Professional-grade diving magnets with counter-bored hole design for secure fastening

Understanding Pull Force

Factors Affecting Performance

  • Surface Condition: Rust, paint or marine growth between the magnet and the surface reduces pull force
  • Material Thickness: Thin metal (under 5mm) reduces effective pull force
  • Air Gaps: Even a thin gap (paint, growth, rust) reduces pull force, often a lot
  • Temperature: Higher temperatures reduce magnetic strength
  • Pull Angle: Side-loading or an angled pull reduces holding force, often a lot

Real-World Considerations

Choosing the right capacity

Choose a magnet whose rated pull force is at least 2–3× the holding load you need — more for dynamic, angled or vibrating loads. Rated pull is measured under ideal conditions; actual holding force depends on surface condition, contact area, coating and paint, and the direction of the load. Diving magnets are positioning and holding tools, not lifting equipment.

  • Underwater: Current and wave action create additional forces
  • Curved Surfaces: Reduce contact area and thus pull force
  • Non-Ferrous Metals: Aluminum, brass, copper are non-magnetic
  • Stainless Steel: Austenitic grades (304, 316) show little or no attraction — slightly magnetic only where cold-worked or welded

Ready to Select the Right Model?

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