Dailymag - Neodymium Countersunk Magnets Manufacturer

Neodymium Countersunk Magnets

What is Neodymium Countersunk Magnets

Neodymium countersunk magnets incorporate a countersunk hole either on one or both sides of the magnet. Countersinking involves making a conical hole typically used to accommodate a fastener like a screw or bolt.

Countersinking allows the head of the fastener to sit flush with the surface of the material or just below. This enables easy attachment while maintaining a streamlined appearance.

Neodymium Countersunk Magnets Series

0.107 Neodymium Countersunk Ring Magnet
Neodymium Countersunk Ring Magnet
  • Inner Diameter: 0.107
  • Finish/Plating: Nickel Plated
  • Grade: 45
  • Magnet Material: Neodymium
  • Magnet Shape: Ring
  • MMI Part #: NR002507NCTS
  • Product Thickness (In.): 0.125
  • Pull Rating: 6.50
  • Weight (lbs): 0.001875
  • Features: Counter Sunk both sides
0.150 Neodymium Countersunk Ring Magnet
Neodymium Countersunk Ring Magnet
  • Inner Diameter: 0.150
  • Finish/Plating: Nickel Plated
  • Grade: 45
  • Magnet Material: Neodymium
  • Magnet Shape: Ring
  • MMI Part #: NR005019NCTS
  • Product Thickness (In.): 0.125
  • Pull Rating: 1.93
  • Weight (lbs): 0.0044
  • Features: Counter Sunk both sides
0.135 Neodymium Countersunk Block Magnet
Neodymium Countersunk Block Magnet
  • Hole Diameter: 0.135
  • Finish/Plating: Nickel-Copper-Nickel Plated
  • Grade: 45
  • Magnet Material: Neodymium
  • Magnet Shape: Block
  • MMI Part #: NB001815NCTS
  • Product Thickness (In.): 0.188
  • Pull Rating: 11.79
  • Width (In.): 0.011
  • Features: Counter Sunk
0.25 Neodymium Countersunk Ring Magnet
Neodymium Countersunk Ring Magnet
  • Inner Diameter: 0.25
  • Finish/Plating: Nickel Plated
  • Grade: 45
  • Magnet Material: Neodymium
  • Magnet Shape: Ring
  • MMI Part #: NR007519NCTS
  • Product Thickness (In.): 0.125
  • Pull Rating: 9.88
  • Weight (lbs): 0.0125
  • Features: Counter Sunk both sides
0.159 Neodymium Countersunk Block Magnet
Neodymium Countersunk Block Magnet
  • Hole Diameter: 0.159
  • Finish/Plating: Nickel-Copper-Nickel Plated
  • Grade: 45
  • Magnet Material: Neodymium
  • Magnet Shape: Block
  • MMI Part #: NB001218NCTS
  • Product Thickness (In.): 0.125
  • Pull Rating: 7.87
  • Weight (lbs): 0.007
  • Features: Counter Sunk
0.170 Neodymium Countersunk Block Magnet
Neodymium Countersunk Block Magnet
  • Hole Diameter (In.): 0.170
  • Finish/Plating: Nickel-Copper-Nickel Plated
  • Grade: 45
  • Magnet Material: Neodymium
  • Magnet Shape: Block
  • MMI Part #: NB002552NCTS
  • Product Thickness (In.): 0.250
  • Pull Rating: 14.09
  • Weight (lbs): 0.014
  • Features: Counter Sunk
0.136 Neodymium Countersunk Ring Magnet
Neodymium Countersunk Ring Magnet
  • Inner Diameter: 0.136
  • Finish/Plating: Nickel Plated
  • Grade: 45
  • Magnet Material: Neodymium
  • Magnet Shape: Ring
  • MMI Part #: NR005020NCTS
  • Product Thickness (In.): 0.250
  • Pull Rating: 11.10
  • Weight (lbs): 0.0115
  • Features: Counter Sunk both sides
2 Holes Neodymium Countersunk Block Magnet
Holes Neodymium Countersunk Block Magnet
  • Finish/Plating: Nickel-Copper-Nickel Plated
  • Grade: 45
  • Magnet Material: Neodymium
  • Magnet Shape: Block
  • MMI Part #: NB001222NCTSX2
  • Product Thickness (In.): 0.125
  • Pull Rating: 11.08
  • Weight (lbs): 0.028
  • Features: 2 countersunk holes
0.206 Neodymium Countersunk Block Magnet
Neodymium Countersunk Block Magnet
  • Hole Diameter: 0.206
  • Finish/Plating: Nickel Plated
  • Grade: 45
  • Magnet Material: Neodymium
  • Magnet Shape: Block
  • MMI Part #: NB001219NCTS
  • Product Thickness (In.): 0.125
  • Pull Rating: 11.71
  • Weight (lbs): 0.017
  • Features: Counter Sunk
23 Products Found.

Neodymium Countersunk Magnet Options By Shape

Tolerances for NdFeB Countersunk Magnet

Tolerances are allowable variations in dimensions to ensure the final magnet meets functional requirements and specific standards. The key tolerance aspect for neodymium countersunk magnets is dimensional tolerance.

This defines the allowable variations in the magnet’s size and shape not limited to length, width, thickness, and countersunk hole diameters. Having tight dimensional tolerances is necessary to ensure the magnets fit accurately within their intended applications while maintaining a flush appearance.

Distinguishing Characteristics of Neodymium Countersunk Magnets
Neodymium Countersunk Magnets Applications

Coatings Applicable on Neo Countersunk Magnet

Application of coatings to neodymium countersunk magnets offers corrosion protection thus enhancing durability. Some common coatings are:

Nickel: Implemented in a nickel-copper-nickel configuration, it is widely used providing excellent corrosion resistance and durability.

Zinc: Offers good corrosion resistance often as an alternative to nickel coating.

Gold: Provides excellent corrosion resistance used where biocompatibility, aesthetics, and electrical conductivity are important.

Black Epoxy Coating: Offers enhanced aesthetics alongside corrosion protection.

Neodymium Grades for Countersunk Magnet

There are several grades of neodymium magnets combining numbers and letters to indicate material composition and properties. Common grades used for neodymium countersunk magnets are:

  • N35 to N52: These standard grades represent the magnetic strength of the magnet, with N35 being the lowest and N52 the highest.
  • Specialized Grades: Include the H-series which are high-temperature versions of the N-series grades.

Shapes of Neodymium Rare earth Countersunk Magnets

  • Block Shape: These magnets have a rectangular shape and can feature one or more countersunk holes on one or both surfaces.
  • Cylinder Shape: These magnets have a rod-like shape and feature countersunk holes on their flat ends. They find use where a neodymium magnet requires flush insertion into a cylindrical opening.
  • Disc Shape: These magnets are circular in shape and suited for applications requiring mounting of the magnet on a flat surface.
  • Conical Shape: While less common, these neodymium countersunk magnets are used in specialized applications requiring a tapered connection.

Benefits of Neodymium Countersunk Magnets

The unique design of neodymium countersunk magnets offers several benefits as follows:

  • Concealed Mounting: Neodymium countersunk magnets can be hidden beneath surfaces like display panels or cabinet doors. This concealed mounting capability maintains a clean look while still offering a strong connection.
  • Flush Mounting: When using neodymium countersunk magnets, the countersunk hole allows the magnet to sit flush with the mounted surface. This provides a neat and streamlined appearance useful in applications where aesthetics and aerodynamics are important.
  • Secure Fastening: The countersunk design allows for secure fastening using bolts or screws. Consequently, the magnet attaches firmly attached to the surface eliminating need for additional mounting hardware.
  • Simple Installation: Having a countersunk design simplifies the process of installing a neodymium countersink magnet. It allows simple installation of the magnets utilizing screws or bolts, without the need for specialized tools.

NdFeB Countersunk Magnets Characteristics

Neodymium countersunk magnets possess a distinct set of characteristics that make them unique in their application. These magnets are defined by the following features:

  • Major Diameter: This refers to the countersunk hole’s larger of two diameters found atop the conical depression created by the countersink. It determines the fastener’s head size, allowing a flush fit without protrusion above the magnet’s surface.
  • Minor Diameter: The minor diameter is the smaller of the two diameters at the base of the countersunk hole. It is the diameter at the deepest point of the conical depression that determines the fastener’s shaft size.
  • Angle: This refers to the angle of the conical depression from the countersinking usually pegged at 90 degrees. Here, the sides of the conical depression form a right angle with the base of the hole affecting how the fastener sits within the hole and how it engages with the magnet.

Steps in Making Neodymium Countersunk Magnets

Neodymium countersunk magnets can be achieved in one of two common ways: forming via molding or machining. In the former process, it takes the following steps:

  • A mold is formed in the shape of the desired neodymium countersunk magnet.
  • The milled neodymium powder is then allowed into the mold formation.
  • The powder is thereafter compacted utilizing a mechanical or hydraulic press forming the magnet in the desired shape.

The machining process follows the sintering process where the magnets are formed into green magnets bearing the desired shape. A milling machine such as a lathe is utilized to create the countersink feature in the neodymium magnets.

Here,

  • The neodymium magnet is drilled through with the desired minor diameter up to an intended depth.
  • After determination of the angle, a cutting tool is fit to bore the countersink over the minor diameter shaft.
  • The countersink is bored up to the desired depth.
  • Where needed, the minor shaft can be threaded.

Magnetization Methods for Neodymium Countersunk Magnets

Magnetization techniques determine the magnetic properties and behavior of neodymium countersunk magnets. They dictate magnetic domain orientation and distribution with the following common techniques:

  • Single-Pole Magnetization: The neodymium countersunk magnet is placed in a magnetizing fixture with one of its poles facing the magnetizing source. A strong magnetic field then aligns its magnetic domains resulting in a strong magnetic field in the magnet’s opposite pole.
  • Thickness Magnetization: Here, application of the magnetic field is perpendicular to the largest magnet surface resulting in magnetization of its entire thickness.
  • Axial Magnetization: The magnetic field is applied along the length of the magnet resulting in magnetization along the magnet axis.
  • Diametric Magnetization: The magnetic field is applied perpendicular to the magnet’s diameter resulting in magnetization across it.
  • Multi-Pole Magnetization: Utilizes special magnetizing fixture with alternating magnetic poles resulting in alternating north and south poles along the magnet’s length or circumference.
  • Radial Magnetization: Used for magnets with a circular shape with the magnetic field applied radially from the center outward. The result is alternating north and south poles around the magnet’s perimeter.

Uses of Neodymium Countersunk Magnets

Neodymium countersunk magnets find a wide range of uses owing to their convenient design as follows:

  • Automotive Industry: Given their high strength-to-size ratio, they’re ideal for securing panels, trims, and other components.
  • Closures in Leather Goods: These magnets can be incorporated in leather accessories like bags and wallets for closure.
  • Fixtures and Displays: Neodymium countersunk magnets can be used to attach fixtures, signage and displays allowing easy mounting.
  • Furniture Closure: They can be used in cabinets and doors resulting in a secure closure mechanism with easy installation and hidden from view.
  • Industrial Use: Here, they are used for holding and aligning objects in assembly processes, jigs and fixtures for increased accuracy and efficiency.
  • Mechanical Assemblies: When integrated into mechanical assemblies requiring flush connections, they offer a strong and space efficient solution.
  • Tool Holders: Neodymium countersunk magnets can be used to hold tools like spanners, hammers and wrenches.
  • Woodworking and Joinery: Here, they can be embedded and concealed under materials, their strength used to hold parts in unique designs.
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