Datasheet

42 Kanthal Appliance Alloys Handbook.
7. Standard Tolerances
Standard tolerances for wire and ribbon
are given below. Size tolerances do not
apply to material manufactured to
resistance tolerances and vice-versa.
Tolerances on electrical
resistance
Resistance of wire at 20 °C
Diameter ≤ 0.127 mm 0.0048 in ±8 %.
All dimensions >0.127 mm 0.0048 in ±5 %.
Max deviation Max deviation
from nominal from nominal
Wire size, value, Max ovality, Wire size, value, Max ovality,
mm mm mm In in in
d Tol = ±0.015·√d Tol = ±0.015·√d d Tol = ±0.002975·√d Tol = ±0.002975·√d
Tolerances on dimensions
Tolerances on diameter of wire according to the EN 10 218-2 T4 standard
Max ovality = a – b
a
b
Tolerances on dimensions of cold rolled ribbon
Ribbon is normally specified with a resistance tolerance.
If requested, dimension tolerance on width can be applied as below.
Width Thickness
mm mm
in in
0.07-0.2 0.2-0.5 0.5-0.8
0.0028-0.008 0.008-0.020 0.020-0.031
0.5-1.5 +0.02 -0.04 +0.01 -0.03
0.020-0.059 +0.0001 -0.0016 +0.0004 -0.0012
1.5-2.5 +0.04 -0.07 +0.03 -0.04 +0.02 -0.04
0.059-0.098 +0.0016 -0.0028 +0.0012 -0.0016 +0.0001 -0.0016
2.5-4.0 ±0.08 +0.12
0.098-0.159 ± 0.0031 +0.0047
Resistance of ribbon
For cold rolled strips and ribbon, all widths
and thickness’ ± 5%.