Product available Ships today (order by 14:00)

MP 20x8/4x5 / N38 - ring magnet

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: 1-6500
Rating: 5

ring magnet

Catalog no 030333

GTIN/EAN: 5906301812272

5.00

Diameter

20 mm [±0,1 mm]

internal diameter Ø

8/4 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

11.31 g

Magnetization Direction

↑ axial

Load capacity

6.65 kg / 65.21 N

Magnetic Induction

277.16 mT / 2772 Gs

Coating

[NiCuNi] Nickel

see parameters »

7.75 ZŁ with VAT / pcs + price for transport

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Detailed specification - MP 20x8/4x5 / N38 - ring magnet

Specification / characteristics - MP 20x8/4x5 / N38 - ring magnet

properties

properties	values
Cat. no.	030333
GTIN/EAN	5906301812272
Production/Distribution	Dhit sp. z o.o. ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin	Poland / China / Germany
Customs code	85059029
Diameter	20 mm [±0,1 mm]
internal diameter Ø	8/4 mm [±0,1 mm]
Height	5 mm [±0,1 mm]
Weight	11.31 g
Magnetization Direction	↑ axial
Load capacity ~ ?	6.65 kg / 65.21 N
Magnetic Induction ~ ?	277.16 mT / 2772 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 20x8/4x5 / N38 - ring magnet

properties	values	units
remenance Br [min. - max.] ?	12.2-12.6	kGs
remenance Br [min. - max.] ?	1220-1260	mT
coercivity bHc ?	10.8-11.5	kOe
coercivity bHc ?	860-915	kA/m
actual internal force iHc	≥ 12	kOe
actual internal force iHc	≥ 955	kA/m
energy density [min. - max.] ?	36-38	BH max MGOe
energy density [min. - max.] ?	287-303	BH max KJ/m
max. temperature ?	≤ 80	°C

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

properties	values	units
Vickers hardness	≥550	Hv
Density	≥7.4	g/cm³
Curie Temperature TC	312 - 380	°C
Curie Temperature TF	593 - 716	°F
Specific resistance	150	μΩ⋅cm
Bending strength	250	MPa
Compressive strength	1000~1100	MPa
Thermal expansion parallel (∥) to orientation (M)	(3-4) x 10^-6	°C^-1
Thermal expansion perpendicular (⊥) to orientation (M)	-(1-3) x 10^-6	°C^-1
Young's modulus	1.7 x 10⁴	kg/mm²

Technical analysis of the assembly - data

Presented data are the direct effect of a mathematical simulation. Values are based on models for the material Nd₂Fe₁₄B. Actual conditions may differ from theoretical values. Use these calculations as a supplementary guide during assembly planning.

Table 1: Static force (pull vs distance) - interaction chart
MP 20x8/4x5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	2424 Gs 242.4 mT	6.65 kg / 6650.0 g 65.2 N	medium risk
1 mm	2265 Gs 226.5 mT	5.81 kg / 5807.9 g 57.0 N	medium risk
2 mm	2070 Gs 207.0 mT	4.85 kg / 4851.0 g 47.6 N	medium risk
3 mm	1858 Gs 185.8 mT	3.91 kg / 3906.5 g 38.3 N	medium risk
5 mm	1437 Gs 143.7 mT	2.34 kg / 2338.7 g 22.9 N	medium risk
10 mm	691 Gs 69.1 mT	0.54 kg / 540.5 g 5.3 N	weak grip
15 mm	343 Gs 34.3 mT	0.13 kg / 133.3 g 1.3 N	weak grip
20 mm	186 Gs 18.6 mT	0.04 kg / 39.3 g 0.4 N	weak grip
30 mm	70 Gs 7.0 mT	0.01 kg / 5.5 g 0.1 N	weak grip
50 mm	18 Gs 1.8 mT	0.00 kg / 0.4 g 0.0 N	weak grip

Magnetic force drops sharply per each millimeter of spacing. Keep in mind that even a microscopic distance (e.g., dirt, varnish, rust) noticeably reduces the pull force. Neodymiums operate most effectively during direct contact; distance weakens the force. Notice how quickly the parameters drop, when the magnet does not adhere flatly to the metal substrate. When calculating the arrangement, discard redundant distances.

Table 2: Sliding capacity (wall)
MP 20x8/4x5 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	1.33 kg / 1330.0 g 13.0 N
1 mm	Stal (~0.2)	1.16 kg / 1162.0 g 11.4 N
2 mm	Stal (~0.2)	0.97 kg / 970.0 g 9.5 N
3 mm	Stal (~0.2)	0.78 kg / 782.0 g 7.7 N
5 mm	Stal (~0.2)	0.47 kg / 468.0 g 4.6 N
10 mm	Stal (~0.2)	0.11 kg / 108.0 g 1.1 N
15 mm	Stal (~0.2)	0.03 kg / 26.0 g 0.3 N
20 mm	Stal (~0.2)	0.01 kg / 8.0 g 0.1 N
30 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

The table below shows the approximate holding capacity necessary to initiate the downward movement of the magnet down along a upright steel plate (considering typical friction). This parameter is a function of the gap size between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 20x8/4x5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	2.00 kg / 1995.0 g 19.6 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	1.33 kg / 1330.0 g 13.0 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.67 kg / 665.0 g 6.5 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	3.33 kg / 3325.0 g 32.6 N

When placing a magnet on a upright wall (e.g., a board), it you can count on only about 1/5 of nominal attraction strength. Gravitational force and a weak degree of grip mean that magnets slip faster than they detach. Planning a vertical fastening? Consider that the shear force is noticeably lower than the perpendicular breakaway force. On a painted metal, the holder will slip down under a significantly smaller load. Using a rubber layer can drastically improve the result.

Table 4: Material efficiency (saturation) - power losses
MP 20x8/4x5 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.67 kg / 665.0 g 6.5 N
1 mm	25%	1.66 kg / 1662.5 g 16.3 N
2 mm	50%	3.33 kg / 3325.0 g 32.6 N
5 mm	100%	6.65 kg / 6650.0 g 65.2 N
10 mm	100%	6.65 kg / 6650.0 g 65.2 N

A thin sheet cannot absorb the full magnetic flux, which weakens actual performance of the magnet. If you attach a powerful product to a thin surface, the field will pass right through and the holding will be smaller. To achieve 100% of this neodymium's power, you require a sufficiently solid piece of steel. The saturation effect causes that on thin elements (e.g., appliance housings), the product shows lower pull force. We suggest choosing the steel dimension from these parameters.

Table 5: Working in heat (stability) - thermal limit
MP 20x8/4x5 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	6.65 kg / 6650.0 g 65.2 N	OK
40 °C	-2.2%	6.50 kg / 6503.7 g 63.8 N	OK
60 °C	-4.4%	6.36 kg / 6357.4 g 62.4 N
80 °C	-6.6%	6.21 kg / 6211.1 g 60.9 N
100 °C	-28.8%	4.73 kg / 4734.8 g 46.4 N

Ordinary NdFeB products irreversibly lose strength after exceeding the maximum temperature. Avoid high temperatures – excessive heat can permanently destroy this product. With increasing heat, the neodymium's power temporarily decreases. Avoid using this product near heat sources exceeding its operating temperature limit. Exceeding the critical threshold will cause destruction of magnetic properties.

*Technical advisory: Temperature resistance is determined by both grade, but also on the magnet's shape. Low-profile magnets (pancake types) are more susceptible to demagnetization sooner than taller cylinders. Red status in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MP 20x8/4x5 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	9.28 kg / 9284 g 91.1 N 4 012 Gs	N/A
1 mm	8.73 kg / 8732 g 85.7 N 4 701 Gs	7.86 kg / 7859 g 77.1 N ~0 Gs
2 mm	8.11 kg / 8108 g 79.5 N 4 530 Gs	7.30 kg / 7297 g 71.6 N ~0 Gs
3 mm	7.45 kg / 7448 g 73.1 N 4 342 Gs	6.70 kg / 6703 g 65.8 N ~0 Gs
5 mm	6.10 kg / 6102 g 59.9 N 3 930 Gs	5.49 kg / 5492 g 53.9 N ~0 Gs
10 mm	3.27 kg / 3265 g 32.0 N 2 875 Gs	2.94 kg / 2939 g 28.8 N ~0 Gs
20 mm	0.75 kg / 755 g 7.4 N 1 382 Gs	0.68 kg / 679 g 6.7 N ~0 Gs
50 mm	0.02 kg / 19 g 0.2 N 220 Gs	0.02 kg / 17 g 0.2 N ~0 Gs

Two magnetic products attract each other from a wider radius than a magnet and sheet combination. Such a system of two magnets generates a stronger field and a wider radius of action. Designing a powerful holder? Utilize two neodymiums instead of one magnet and a striker plate. Be careful that when bringing together two magnets, the pinch force is massive. The repulsion force is marginally weaker than the attraction, but still significant.
*Flux density in repulsion mode drops to ~0 Gs at the midpoint of the gap (resulting from vector opposition).

Table 7: Safety (HSE) (implants) - precautionary measures
MP 20x8/4x5 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	8.0 cm
Hearing aid	10 Gs (1.0 mT)	6.5 cm
Timepiece	20 Gs (2.0 mT)	5.0 cm
Phone / Smartphone	40 Gs (4.0 mT)	4.0 cm
Car key	50 Gs (5.0 mT)	3.5 cm
Payment card	400 Gs (40.0 mT)	1.5 cm
HDD hard drive	600 Gs (60.0 mT)	1.5 cm

A strong magnetic field poses a real danger to electronic devices and pacemakers. These magnets generate a flux that prevents correct functioning of digital equipment. Be aware: the unseen radiation passes through tissues and glass. Special caution must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, car keys, membranes, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - warning
MP 20x8/4x5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	25.67 km/h (7.13 m/s)	0.29 J
30 mm	42.38 km/h (11.77 m/s)	0.78 J
50 mm	54.68 km/h (15.19 m/s)	1.30 J
100 mm	77.33 km/h (21.48 m/s)	2.61 J

NdFeB products are prone to chipping – a violent impact against metal can result in shattering. Pay attention to connection velocity – a magnet released freely speeds with massive force. Striking energy can destroy the magnet or injury to skin. Always hold the magnet during mounting so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear safety glasses when handling with large magnets.

Table 9: Surface protection spec
MP 20x8/4x5 / N38

Technical parameter	Value / Description
Coating type	[NiCuNi] Nickel
Layer structure	Nickel - Copper - Nickel
Layer thickness	10-20 µm
Salt spray test (SST) ?	24 h
Recommended environment	Indoors only (dry)

The following table defines the conditions under which this product can be safely used. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (P_c)
MP 20x8/4x5 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	7 218 Mx	72.2 µWb
P_c Coefficient	0.31	Low (Flat)

Flux value emitted by the magnet pole. Essential parameter when building generators as well as sensors. The P_c coefficient defines the working geometry.

Table 11: Underwater work (magnet fishing)
MP 20x8/4x5 / N38

Environment	Effective steel pull	Effect
Air (land)	6.65 kg	Standard
Water (riverbed)	7.61 kg (+0.96 kg Buoyancy gain)	+14.5%

Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Vertical hold

*Warning: On a vertical surface, the magnet retains only approx. 20-30% of its max power.

2. Efficiency vs thickness

*Thin metal sheet (e.g. 0.5mm PC case) drastically limits the holding force.

3. Heat tolerance

*For N38 material, the critical limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.31

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The P_c (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher P_c value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Technical specification and ecology

Chemical composition

iron (Fe)	64% – 68%
neodymium (Nd)	29% – 32%
boron (B)	1.1% – 1.2%
dysprosium (Dy)	0.5% – 2.0%
coating (Ni-Cu-Ni)	< 0.05%

Ecology and recycling (GPSR)

recyclability (EoL)	100%
recycled raw materials	~10% (pre-cons)
carbon footprint	low / zredukowany
waste code (EWC)	16 02 16

Safety card (GPSR)

responsible entity

Dhit sp. z o.o.

ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki

tel: +48 22 499 98 98 | e-mail: bok@dhit.pl

batch number/type

id: 030333-2025

Measurement Calculator

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Kilograms (kg)

Force (N)

Pounds (lbs)

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Induction (Gs)

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Input a figure in just one slot to see the conversion in the other units at once.

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The ring magnet with a hole MP 20x8/4x5 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Thanks to the hole (often for a screw), this model enables quick installation to wood, wall, plastic, or metal. This product with a force of 6.65 kg works great as a door latch, speaker holder, or spacer element in devices.

This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. When tightening the screw, you must maintain great sensitivity. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure will cause the ring to crack. It's a good idea to use a rubber spacer under the screw head, which will cushion the stresses. Remember: cracking during assembly results from material properties, not a product defect.

These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but is not sufficient for rain. In the place of the mounting hole, the coating is thinner and can be damaged when tightening the screw, which will become a corrosion focus. If you must use it outside, paint it with anti-corrosion paint after mounting.

The inner hole diameter determines the maximum size of the mounting element. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Aesthetic mounting requires selecting the appropriate head size.

This model is characterized by dimensions Ø20x5 mm and a weight of 11.31 g. The pulling force of this model is an impressive 6.65 kg, which translates to 65.21 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 8/4 mm.

These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. If you want two such magnets screwed with cones facing each other (faces) to attract, you must connect them with opposite poles (N to S). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Strengths as well as weaknesses of neodymium magnets.

Pros

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

They have stable power, and over around ten years their performance decreases symbolically – ~1% (in testing),
They do not lose their magnetic properties even under close interference source,
In other words, due to the metallic finish of silver, the element gains a professional look,
Magnets are distinguished by excellent magnetic induction on the active area,
Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
Due to the option of flexible molding and adaptation to unique requirements, neodymium magnets can be manufactured in a variety of forms and dimensions, which amplifies use scope,
Wide application in electronics industry – they are used in hard drives, electric drive systems, precision medical tools, as well as technologically advanced constructions.
Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Disadvantages

Cons of neodymium magnets: application proposals

They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
Due to limitations in creating threads and complex shapes in magnets, we propose using cover - magnetic mount.
Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these devices are able to complicate diagnosis medical in case of swallowing.
High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Pull force analysis

Best holding force of the magnet in ideal parameters – what it depends on?

The declared magnet strength represents the limit force, recorded under laboratory conditions, meaning:

with the application of a yoke made of low-carbon steel, ensuring full magnetic saturation
with a cross-section of at least 10 mm
with an polished touching surface
without the slightest insulating layer between the magnet and steel
for force applied at a right angle (pull-off, not shear)
in neutral thermal conditions

Impact of factors on magnetic holding capacity in practice

In practice, the actual lifting capacity results from several key aspects, presented from crucial:

Distance (betwixt the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
Chemical composition of the base – mild steel gives the best results. Alloy steels lower magnetic permeability and lifting capacity.
Surface quality – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
Temperature influence – high temperature weakens pulling force. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, whereas under shearing force the load capacity is reduced by as much as 5 times. Moreover, even a small distance between the magnet and the plate decreases the load capacity.

Precautions when working with NdFeB magnets

No play value

Only for adults. Small elements pose a choking risk, causing serious injuries. Keep away from kids and pets.

Heat sensitivity

Regular neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.

Warning for allergy sufferers

A percentage of the population suffer from a contact allergy to Ni, which is the typical protective layer for NdFeB magnets. Extended handling may cause a rash. We strongly advise wear protective gloves.

Magnetic interference

Navigation devices and mobile phones are highly sensitive to magnetic fields. Direct contact with a strong magnet can decalibrate the internal compass in your phone.

Machining danger

Powder generated during grinding of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Beware of splinters

Protect your eyes. Magnets can fracture upon violent connection, launching shards into the air. We recommend safety glasses.

Magnetic media

Device Safety: Strong magnets can damage data carriers and sensitive devices (heart implants, medical aids, timepieces).

Finger safety

Watch your fingers. Two powerful magnets will join instantly with a force of massive weight, destroying everything in their path. Be careful!

Medical implants

Health Alert: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.

Conscious usage

Before use, check safety instructions. Sudden snapping can break the magnet or hurt your hand. Be predictive.

Caution! Want to know more? Read our article: Why are neodymium magnets dangerous?

MP 20x8/4x5 / N38 - ring magnet

Detailed specification - MP 20x8/4x5 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical analysis of the assembly - data

Table 1: Static force (pull vs distance) - interaction chart MP 20x8/4x5 / N38

Table 2: Sliding capacity (wall) MP 20x8/4x5 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces MP 20x8/4x5 / N38

Table 4: Material efficiency (saturation) - power losses MP 20x8/4x5 / N38

Table 5: Working in heat (stability) - thermal limit MP 20x8/4x5 / N38

Table 6: Magnet-Magnet interaction (attraction) - field collision MP 20x8/4x5 / N38

Table 7: Safety (HSE) (implants) - precautionary measures MP 20x8/4x5 / N38

Table 8: Dynamics (cracking risk) - warning MP 20x8/4x5 / N38

Table 9: Surface protection spec MP 20x8/4x5 / N38

Table 10: Construction data (Pc) MP 20x8/4x5 / N38

Table 11: Underwater work (magnet fishing) MP 20x8/4x5 / N38

1. Vertical hold

2. Efficiency vs thickness

3. Heat tolerance

4. Demagnetization curve and operating point (B-H)

Chemical composition

Ecology and recycling (GPSR)

Pulling force

Magnetic Induction

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Strengths as well as weaknesses of neodymium magnets.

Pros

Disadvantages

Pull force analysis

Best holding force of the magnet in ideal parameters – what it depends on?

Impact of factors on magnetic holding capacity in practice

Precautions when working with NdFeB magnets

No play value

Heat sensitivity

Warning for allergy sufferers

Magnetic interference

Machining danger

Beware of splinters

Magnetic media

Finger safety

Medical implants

Conscious usage

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (pull vs distance) - interaction chart
MP 20x8/4x5 / N38

Table 2: Sliding capacity (wall)
MP 20x8/4x5 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 20x8/4x5 / N38

Table 4: Material efficiency (saturation) - power losses
MP 20x8/4x5 / N38

Table 5: Working in heat (stability) - thermal limit
MP 20x8/4x5 / N38

Table 6: Magnet-Magnet interaction (attraction) - field collision
MP 20x8/4x5 / N38

Table 7: Safety (HSE) (implants) - precautionary measures
MP 20x8/4x5 / N38

Table 8: Dynamics (cracking risk) - warning
MP 20x8/4x5 / N38

Table 9: Surface protection spec
MP 20x8/4x5 / N38

Table 10: Construction data (P_c)
MP 20x8/4x5 / N38

Table 11: Underwater work (magnet fishing)
MP 20x8/4x5 / N38