Industrial Crimp Quality Handbook
Doc No: TM-640160065
Release Date: 00-00-02
UNCONTROLLED COPY
Page 27 of 27
Revision: C
Revision Date: 12-23-09
Technical Wire Information
CMA — Circular Mil Area. Circular Mil is a unit of area equal to that of a circle whose
diameter is one Mil.
MIL — One mil equals .001 inches.
.001” = 1 mil
.030” = 30 mils
.125” = 125 mils
Changing Inches to Mils
1. Multiply inches by 1000 or,
2. Move decimal point 3 places to right or,
3. Change terminology, i.e. 0.032 in. = 32 thousandths or 32 mils.
Computation of CMA
Round Solid Conductor:
Change diameter from inches to mils, and then multiply the diameter “D” in mils by itself.
CMA = D mils x D mils
Stranded Conductor:
Find CMA of a single strand and multiply the result by the total number of strands.
CMA = (D x D) x Number of Strands of one Strand
SECTION 9
MISCELLANEOUS
AWG-CMA Table
Terminal Size /AWG
CMA Range
26-22
202-810
24-20
320-1,020
22-18
509-2,600
22-16
509-3,260
16-14
2,050-5,180
14-12
3,260-8,213
12-10
5,180-13,100
8
13,100-20,800
6
20,800-33,100
4
33,100-52,600
2
52,600-83,700
1/0
83,700-119,500
2/0
119,500-150,500
3/0
150,500-190,000
4/0
190,000-231,000
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