Dimension and line position tolerance standard of sintered Nd-Fe-B and bonded Nd-Fe-B
Neodymium iron boron magnet manufacturers generally control the size and tolerance of magnetic materials very strictly, and users generally have certain requirements for the size tolerance and form and position tolerance of neodymium iron boron, because the unqualified product size will lead to the failure of neodymium iron boron components to install, or even damage the machine. Substandard size often leads to the risk of batch returns.
The net editor of NdFeB magnet manufacturers has sorted out the basic requirements for dimensional tolerance and form and position tolerance of sintered NdFeB and bonded NdFeB national standards for you, which can be used in design and material selection.
National standard for dimension deviation and row position deviation of sintered NdFeB:
|
Size range
|
Deviation of sintering surface
|
Machining surface deviation
|
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|
Perpendicular to pressing direction
|
Pressing direction
|
Flat grinding
|
Internal and external grinding
|
Wire cutting
|
Section | |
|
≤10
|
±0.20
|
±0.30
|
±0.05
|
±0.05
|
±0.03
|
±0.03
|
|
10~20
|
±0.30
|
±0.40
|
±0.05
|
±0.08
|
±0.05
|
±0.05
|
|
20~50
|
±0.50
|
±0.65
|
±0.10
|
±0.13
|
±0.08
|
±0.10
|
|
50~80
|
±1.00
|
±1.10
|
±0.15
|
±0.20
|
±0.13
|
±0.15
|
|
Deviation type |
Examination site |
Basic dimension / mm |
Deviation | |
|
Parallelism |
Between machining surfaces |
Arbitrary |
One half of the tolerance between two planes |
|
|
Verticality |
Between sintering faces |
Arbitrary |
90°±1° |
|
|
Between processing surface and sintering surface |
90°±1° |
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|
Between two machining surfaces |
90°±1° |
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|
Coaxiality |
Between sintering faces |
External diameter |
≤14 |
±0.35mm |
|
>14~24 |
±0.60mm |
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|
>24~40 |
±0.80mm |
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|
>40~60 |
±1.10mm |
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|
>60~80 |
±1.50mm |
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|
>80~100 |
±2.00mm |
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|
Between machining surfaces |
Arbitrarily |
±0.80mm | ||
| Diameter range / mm |
Dimensional tolerance of diameter |
Height range / mm |
Dimensional tolerance of height |
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| A | B | C | A | B | C | ||
|
≤4 |
0.04 | 0.04 | 0.06 |
≤4 |
0.06 | 0.08 | 0.10 |
|
>4~10 |
0.04 | 0.04 | 0.06 |
>4~10 |
0.08 | 0.10 | 0.14 |
|
>10~18 |
0.04 | 0.06 | 0.08 |
>10~18 |
0.10 | 0.14 | 0.20 |
|
>18~30 |
0.06 | 0.08 | 0.10 |
>18~30 |
0.14 | 0.20 | 0.24 |
|
>30~50 |
0.08 | 0.10 | 0.12 |
>30~50 |
0.20 | 0.24 | 0.30 |
|
>50~80 |
0.10 | 0.12 | 0.20 |
>50~80 |
0.24 | 0.30 | 0.34 |
|
>80~100 |
0.12 | 0.15 | 0.26 |
>80~100 |
0.28 | 0.35 | 0.40 |
|
>100 |
0.15 | 0.18 | 0.30 |
>100 |
0.35 | 0.42 | 0.48 |
| Diameter range / mm |
Dimensional tolerance of diameter |
Height range / mm |
Dimensional tolerance of height |
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| A | B | C | A | B | C | ||
|
≤4 |
0.04 | 0.04 | 0.06 |
≤4 |
0.06 | 0.08 | 0.10 |
|
>4~10 |
0.04 | 0.04 | 0.06 |
>4~10 |
0.08 | 0.10 | 0.14 |
|
>10~18 |
0.04 | 0.06 | 0.08 |
>10~18 |
0.10 | 0.14 | 0.20 |
|
>18~30 |
0.06 | 0.08 | 0.10 |
>18~30 |
0.14 | 0.20 | 0.24 |
|
>30~50 |
0.08 | 0.10 | 0.12 |
>30~50 |
0.20 | 0.24 | 0.30 |
|
>50~80 |
0.10 | 0.12 | 0.20 |
>50~80 |
0.24 | 0.30 | 0.34 |
|
>80~100 |
0.12 | 0.15 | 0.26 |
>80~100 |
0.28 | 0.35 | 0.40 |
|
>100 |
0.15 | 0.18 | 0.30 |
>100 |
0.35 | 0.42 | 0.48 |
