Do i need to buy both a north and a south pack in order to make my door stick? or does a pack include plain steel rings for the magnet to stick to?

No, no plain steel rings are provided. But be careful when choosing screws to attach the magnets. Use brass or any non magnetic material. I initially made the mistake of choosing a metal screw, and it opposed the magnetic force.

Would this be ok to use as a replacement magnet on a treadmill?

It might work, but why take the risk when you can get a purpose-designed replacement for less than £2 on eBay.

The diameter of this magnet is 20mm and then the thickness is 3mm.

What do i need to hold up lightweight curtains, say five north p magnets inside the curtain hem and five south p magnets screwed into the window?

They would support curtains but depends on curtain length as to how many

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N42 Neodymium Countersunk Magnet for Arts, Crafts, Model Making, DIY, Hobbies, Office, and Home - 20mm dia x 3mm thick x 3.6mm Countersunk Hole - 4.5kg Pull - North - Pack of 2

Product ID: 48298955

Details

Brand
FIRST4MAGNETS
Colour
Silver
Material
Copper Nickel
Product dimensions
20L x 20W x
Shape
Round

🔩3.6mm countersunk hole for secure fixing

🧲4.5kg pull force

🛡️Triple-layer corrosion-resistant coating

€ 26.76

Duties & taxes included

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Sold byAmazon FranceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🧲 Elevate your projects with magnetic mastery – don’t get left behind!

POWERFUL 4 5 KG PULL FORCE - Unleash maximum magnetic strength for secure holds and creative fixes.
PRECISION COUNTERSUNK DESIGN - Easily mount with 3mm screws for a flush, professional finish.
RARE EARTH MAGNET TECHNOLOGY - Experience cutting-edge magnetic power developed since the 1980s for modern innovation.
VERSATILE CREATIVE INDUSTRIAL USE - Perfect for arts, crafts, DIY, and engineering projects demanding reliability.
TRIPLE LAYER NICKEL COPPER NICKEL COATING - Durable, corrosion-resistant surface ensures long-lasting performance.

The N42 Neodymium Countersunk Magnet is a premium rare earth magnet featuring a strong 4.5kg pull force, precision countersunk hole for secure mounting, and a triple-layer corrosion-resistant coating. Ideal for both creative and industrial applications, this pack of two 20mm diameter magnets offers reliable, long-lasting magnetic power for professionals and hobbyists alike.

Specifications

ASIN	B00TACK28Y
Best Sellers Rank	61,786 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 374 in Rare Earth Magnets
Brand	FIRST4MAGNETS
Colour	Silver
Country Of Origin	China
Customer Reviews	4.2 4.2 out of 5 stars (343)
Global Trade Identification Number	05055641230274
Included Components	Magnets
Item Dimensions L x W x Thickness	20L x 20W x 3Th millimetres
Item Shape	Round
Item Thickness	3 Millimetres
Item Type Name	20mm dia x 3mm thick x 3.6mm c/s hole N42 Neodymium Magnet - 4.5kg Pull ( North ) ( Pack of 2 )
Item Weight	0.05 Kilograms
Manufacturer	Magnet Expert®
Manufacturer Part Number	F406N-2
Material Type	Copper,Nickel
Model Number	F406N-2
Number of Items	2
Number of Pieces	2
Pull Force	4.5 Kilograms
Unit Count	2.0 count

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