Designation: B 48 – 00 (Reapproved 2005)
e1
Standard Specification for
Soft Rectangular and Square Bare Copper Wire for
Electrical Conductors
1
This standard is issued under the fixed designation B 48; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (e) indicates an editorial change since the last revision or reapproval.
e
1
NOTE—“D–c references corrected to “dc” in Paragraph 12.3 in March 2005.
1. Scope
1.1 This specification covers soft or annealed bare copper
wire, rectangular or square in shape with rounded corners
(Explanatory
Note 1).
1.2 For the purpose of this specification, the wire is classi-
fied as follows:
1.2.1 Type A—For all applications except those involving
edgewise bending.
1.2.2 Type B—For applications involving edgewise bend-
ing. Type B wire of thickness less than 0.020 in. (0.51 mm) or
with a ratio of width to thickness greater than 30 to 1 is not
contemplated in this specification.
1.3 Unless otherwise specified by the purchaser, Type A
material shall be furnished.
1.4 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only
and are not considered standard; except for Sections
12 and 13.
2. Referenced Documents
2.1 ASTM Standards:
2
B49 Specification for Copper Rod Drawing Stock for
Electrical Purposes
B 193 Test Method for Resistivity of Electrical Conductor
Materials
B 279 Test Method for Stiffness of Bare Soft Square and
Rectangular Copper and Aluminum Wire for Magnet Wire
Fabrication
E8 Test Methods for Tension Testing of Metallic Materials
E29 Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications
2.2 Other Documents:
NBS Handbook 100 Copper Wire Tables
3
3. Ordering Information
3.1 Orders for material to this specification shall include the
following information:
3.1.1 Quantity of each size;
3.1.2 Type of wire (see
1.1, 1.2, and 1.3);
3.1.3 Wire size: thickness and width, in inches or millime-
tres (see
6.1);
3.1.4 Type of copper, if special (see Section
4);
3.1.5 Package size (see 16.1);
3.1.6 Special package marking, if required; and
3.1.7 Place of inspection. (see Section
15).
4. Material
4.1 The material shall be copper of such quality and purity
that the finished product shall have the properties and charac-
teristics prescribed in this specification.
4.2 Specification
B49defines the materials suitable for use.
5. Manufacture
5.1 The wire shall be annealed after the last drawing or
rolling to size and shape, and shall be so processed as to
produce a uniformly soft product with a clean surface.
5.2 The finished wire shall not contain joints except such as
have passed through drawing dies. Necessary joints in the wire
and rods prior to final drawing shall be made in accordance
with good commercial practice.
6. Dimensions and Permissible Variations
6.1 The dimensions shall be expressed in decimal fractions
of an inch or in millimetres. Unless otherwise specified, it will
be assumed that the dimensions are in inches. (Explanatory
Note 6, Explanatory Note 7, and Explanatory Note 8.)
6.2 The thickness shall not vary from that specified by more
than the amounts prescribed in
Table 1.
6.3 The width shall not vary from that specified by more
than the amounts prescribed in
Table 2.
1
This specification is under the jurisdiction of ASTM Committee B01 on
Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on
Conductors of Copper and Copper Alloys.
Current edition approved Mar. 1, 2005. Published March 2005. Originally
approved in 1968. Last previous edition approved in 2000 as B 48 – 00.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
3
Available from National Institute of Standards and Technology (NIST), 100
Bureau Dr., Stop 3460, Gaithersburg, MD 20899-3460..
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