N40 1.25"X0.125" Countersunk Neodymium Iron Boron Ring Magnet

• Application: Speaker Magnet, Industrial Magnet, Jewelry Magnet, Solenoid, Motor Magnet, Generator Magnet
• Shape: Countersunk Ring
• Coating: Nickel
• Grade: N40
• Product Name: N50 D20X3X5mm Strong Round Ring Countersunk Magnet
• Envrionment Management System: ISO9001/14001
• Model NO.: N40
• Certificate: CE/RoHS/SGS
• Tolerance: +/- 0.05mm
• Model Number: N40 Neodymium Iron Boron
• Magnetization Direction: Axial/Radial/Multi-Poles Magnetization
• Working Temp.: 80-200 Degree Centigrade
• Payment: T/T, Paypal, Western Union
• Transportation: by Sea, by Air, by Express
• Lead Time: 15-25days
• Transport Package: Iron Box & Double Wall Corrugated Carton
• Specification: D20x3x5mm
• Trademark: GME
• Origin: Zhejiang Ningbo/ Fujian Xiamen
• HS Code: 850511100
• Production Capacity: 3000 Tons

Product Description

A permanent magnet is that a magnet that is permanent, in contrast to an electromagnet, which only behaves like a magnet when an electric current is flowing through it.
Permanent magnets are made out of substances like magnetite (Fe3O4), 
the most magnetic naturally occurring mineral or neodymium, Samarium cobalt, a powerfully magnetic synthetic substance.
The Earth itself is a huge permanent magnet, though its magnetic field is quite weak relative to its size. Humans have used the magnetic field of the Earth for navigation since the compass was invented in ancient China.
 

Specification	D1.25"x0.125"x0.341"
Material Grade	Neodymium N40
Outer Diameter	1.25"
Inner Diameter	0.341"
Countersunk Hole	0.194"
Thickness	0.125"
Coating	NiCuNi
Color	Silver Tone
Magnetized direction	through thickness
Magnet Weight	18.66g
Surface Gauss	2974
Optimal Pull	33.11Kg
MOQ	1000pcs
Leading Time	18-23 working days
Sample	Yes
Certificate	ISO2000, TS16949, RoHS, CE & SGS
Payment	T/T, PayPal, Western Union

Magnetic Characteristics of N50

GRADE	Remanence		Coercive Force		Intrinsic Coercive		Max Energy Product		Working Temp.
	(Br)		(bHc)		(iHc)		(BH)max		Tw(ºC)
	T	KGs	KA/m	KOe	KA/m	KOe	KJ/m³	MGOe

N40

1.26-1.31

12.6-13.1

≥923

≥11.6

≥955

≥12

302-326

38-41

≤80