Q
What are the General Dimensional Tolerances of NdFeB Magnets and SmCo Magnets?
A
Block
Dimension range(mm) Plane view(mm) Parallelism(mm) Perpendicularity(mm)
0.5≤L≤10 +/-0.03 +/-0.03 0.3 degree for adjacent sides
10≤L≤50 +/-0.03 +/-0.05
  L>50 +/-0.03 +/-0.1

 

Disc
Dimension range(mm) Cylindricity(mm) Tolerance(mm) Parallelism(mm)
1≤D≤5 +/-0.02 +/-0.02 +/-0.02
5≤D≤25 +/-0.03 +/-0.05 +/-0.05
25≤D≤50 +/-0.05 +/-0.05 +/-0.05
D>50 +/-0.05 +/-0.1 +/-0.1

 

Ring
Dimension range(mm) Cylindricity(mm) Tolerance(mm) Parallelism(mm)
1≤D≤3 +/-0.02 +/-0.02 +/-0.02
3≤D≤5 +/-0.04 +/-0.03 +/-0.05
5≤D≤15 +/-0.05 +/-0.05 +/-0.03
D>15 +/-0.1 +/-0.05 +/-0.1

 

Segment
Item Dimension range(mm) Tolerance(mm)
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
Chordal Length W<63 +/-0.05
W>63 +/-0.06

 

 

Previous:How to Read a dial Caliper?

Next:How to use a micrometer?