China permanent magnet manufacturer: www.rizinia.com

Product size (shape) tolerance description of NdFeB magnet

The dimensional tolerance of NdFeB refers to a product determined to be produced within the allowable size range. The purpose of the tolerance is to specify the allowable defect margin for the manufacture of NdFeB magnets.
The following is the dimensional tolerance range of various specifications.
Tolerance range of NdFeB block magnet:

Size range
Plane size
Parallelism
Verticality
0.5≤L≤10
±0.03
±0.03
Adjacent face<0.3 degree
10≤L≤50
±0.05
±0.05
L>50
±0.1
±0.1
Dimension Tolerance Range of NdFeB disc magnet:
Size range
Round axis
Tolerance
Parallelism
1≤D≤5
±0.02
±0.02
±0.02
5≤D≤25
±0.03
±0.05
±0.03
25≤D≤50
±0.05
±0.05
±0.05
D>50
±0.05
±0.1
±0.1
Tolerance range of NdFeB ring magnet size:
Size range
Round axis
Tolerance
Parallelism
1≤d≤3
±0.02
±0.02
±0.02
3≤d≤5
±0.04
±0.03
±0.02
5≤d≤15
±0.05
±0.05
±0.03
d>15
±0.1
±0.05
±0.1

Tolerance range of NdFeB Arc magnet size:
Project
Size range
Tolerance
Wall thickness
T≤10
±0.04
10<T≤25
±0.05
Length
L≤10
±0.03
10< L≤25
±0.03
25< L≤63
±0.04
L>63
±0.06
Width of arc surface
W>63
±0.05
W>63
±0.06

The processing difficulty beyond this size range will be greatly increased. The price of NdFeB will also increase greatly due to the increase in loss rate.

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