Recommended Winding Tensions
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WHOLE AWG SIZE
NEMA NOM. BARE O.D.
Maximum Tension
1,2
Grams
Grams
30
0.0100
358
31
0.0089
282
32
0.0080
228
33
0.0071
180
34
0.0063
142
35
0.0056
112
36
0.0500
89
37
0.0045
72
38
0.0040
57
39
0.0035
44
40
0.0031
34
41
0.0028
28
42
0.0025
22
43
0.0022
17
44
0.0020
14
45
3
0.00176
11
46
3
0.00157
8.8
47
3
0.00140
7.0
48
3
0.00124
5.5
49
3
0.00111
4.4
50
3
0.00099
3.5
51
3
0.00088
2.8
52
3
0.00078
2.2
53
3
0.00070
1.7
54
3
0.00062
1.4
Note: This table is provided as a general guide only; the apropriate winding tensions may vary depending on a number of factors including product application. The type of winder, payoff device, and type of coil may vary the tensions to be used. In general, use the minimum tension that provides a good winding. Some minor variations in the softness of the wire from one lot to another may also dictate minor adjustments in winding tension.
Using the yield strength of fully annealed wire as a point of reference, tensions beyond these may cause excessive stretching and high coil resistance.
Maximum recommended tensions are based upon 10,000 p.s.i. for copper.
Theoretical dimensions for sizes 45 AWG and finer.
Note: Start-up acceleration surge can produce tensions well in excess of production tensions and need to be taken into consideration.