Pushpin Magnet

Overview

Product Specifications

· Dimensions: Magnetic cylinder diameter: 3 - 10 mm; Length: 5 - 20 mm; Total length (including cap): 10 - 30 mm.

· Magnetic Properties: Remanence (Br): 1.2 - 1.4 T; Coercivity (Hcj): 800 - 1200 kA/m; Maximum energy product ((BH)max): 25 - 40 MGOe; Holding force: 0.5 - 5 kg (varies by size).

· Mechanical Features: Non - magnetic cap material: ABS plastic, nylon, or stainless steel; Cap color: black, white, or custom colors; Optional features: flat head, rounded head, or hook - shaped cap for hanging.

Product Grades

Grades are determined by magnetic performance and application requirements:

· Standard Grade (N35 - N45): Most common for general use, with (BH)max of 35 - 45 MGOe, suitable for office and home applications.

· High - Coercivity Grade (N35H - N40H): Higher resistance to demagnetization, (BH)max 35 - 40 MGOe, operating temperature up to 120°C, ideal for industrial environments with temperature fluctuations.

· Miniature Grade: Smaller diameters (3 - 5 mm) with (BH)max 25 - 30 MGOe, designed for precision tasks like model making or lightweight document mounting.

Coatings

To prevent corrosion and enhance durability, common coatings include:

· Nickel - Copper - Nickel Plating: Standard coating, provides good corrosion resistance (salt spray test: 48 - 96 hours), smooth surface finish.

· Zinc Plating: Economical option for dry indoor environments, basic corrosion protection (salt spray test: 24 - 48 hours).

· Epoxy Coating: Colored or transparent coating, offers chemical resistance, suitable for decorative or specialized applications.

· Gold Plating: Rare, used for aesthetic or high - end applications, excellent corrosion resistance but higher cost.

Application Scope

· Office and Stationery: Mounting documents, notes, or photos on whiteboards, refrigerators, or metal surfaces; organizing cables or small tools.

· Home Use: Hanging lightweight curtains, decorations, or kitchen utensils; securing metal items in workshops or garages.

· Industrial and Manufacturing: Temporary fixturing of metal parts during assembly, holding templates or gauges on machinery; lightweight magnetic clamping.

· Crafts and Hobbies: Model building, DIY projects, magnetic jewelry clasps, or educational experiments demonstrating magnetism.

· Retail and Display: Attaching price tags, posters, or promotional materials to metal shelves or display racks.

Packaging Information

· Small Quantity Packaging: Blister packs or plastic clamshells with individual compartments, containing 10 - 50 pieces per pack; labeled with size, grade, and holding force.

· Bulk Packaging: Sealed plastic bags (100 - 500 pieces) inside cardboard boxes with foam padding to prevent damage during shipping; includes desiccant packets to absorb moisture.

· Safety Packaging: Child - resistant packaging (for small sizes) with warning labels about choking hazards and magnetic field risks (e.g., "Keep away from pacemakers").

· Export Packaging: Complies with IATA regulations for magnetic materials; may include magnetic shielding (steel sheets) if flux density exceeds airline limits.

Common Questions

· Magnetic Strength: Why do smaller pushpin magnets have lower holding force? Holding force depends on size and grade; smaller magnets (3 - 5 mm diameter) typically hold 0.5 - 1 kg, while larger ones (8 - 10 mm) can hold 3 - 5 kg.

· Safety Risks: Are they dangerous for children? Yes, small magnets pose a choking hazard; if swallowed, multiple magnets can attract internally, causing intestinal damage—keep out of reach of children under 6.

· Demagnetization: Can they lose magnetism over time? NdFeB magnets are permanent but may demagnetize if heated above 80 - 120°C (depending on grade) or exposed to strong opposing magnetic fields.

· Surface Damage: Why do plated surfaces chip? Dropping or rough handling can damage the coating; avoid contact with sharp objects or abrasive surfaces.

Compatibility: Will they work on non - metal surfaces? No, they require ferrous (iron - containing) surfaces; use magnetic strips or plates on non - metal surfaces for attachment.