ASTM F85-76(2013)
(Practice)Standard Practice for Nomenclature for Wire Leads Used as Conductors in Electron Tubes
Standard Practice for Nomenclature for Wire Leads Used as Conductors in Electron Tubes
ABSTRACT
This practice covers the rules for naming one, two, or three-piece round wire leads used as conductors through glass seals in electron tubes, excluding stranded leads and leads for semiconductors. Each portion of designation should be separated by a dash (-). Materials for a component lead are generally designated using the chemical symbols. Claddings or platings are represented by numerical suffixes at the end of the material designation preceded by "C" (coating). For alloys that are unspecified, a numerical value between chemical symbols indicates the percent content of the material preceding the value. Descriptive suffixes are used to specify annealing conditions.
SCOPE
1.1 This practice covers rules for designating one, two, or three-piece round wire leads used as conductors through glass seals in electron tubes. Stranded leads and leads for semiconductors are excluded.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: F85 − 76 (Reapproved 2013)
Standard Practice for
Nomenclature for Wire Leads Used as Conductors in
Electron Tubes
This standard is issued under the fixed designation F85; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2 Length—The length shall be expressed in millimetres
using any number of digits.
1.1 This practice covers rules for designating one, two, or
three-piece round wire leads used as conductors through glass
NOTE 1—All fractions shall be expressed in millimetres as decimals.
seals in electron tubes. Stranded leads and leads for semicon-
3.3 Conventions— The diameter shall always precede and
ductors are excluded.
be separated from the length by the letter“ x”. For example, a
1.2 The values stated in SI units are to be regarded as
wire 13 mm long and 0.508 mm in diameter will be referred to
standard. No other units of measurement are included in this
as 508x13.
standard.
4. Nomenclature
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4.1 The nomenclature for designating a lead shall consist of
responsibility of the user of this standard to establish appro-
one, two, or three parts; for one-, two-, or three-piece leads,
priate safety and health practices and determine the applica-
respectively. Each of these parts shall specify for its piece the
bility of regulatory limitations prior to use.
diameter in millimetres, the length in millimetres, and the
material (see Section 4). The order for designating the compo-
2. Referenced Documents
nent pieces shall be: ( 1) the inner lead section, (2) the press of
2.1 ASTM Standards: seal section, and (3) the outer lead section.
B127 Specification for Nickel-CopperAlloy (UNS N04400) 4.1.1 Each portion of the designation shall be separated by
Plate, Sheet, and Strip a dash (—), for example,
B160 Specification for Nickel Rod and Bar 508x13FeCuC40—406x2D—1016x8NiPtd,
F15 Specification for Iron-Nickel-Cobalt Sealing Alloy corresponding to Inner Lead—Press Lead—Outer Lead,
F29 Specification for Dumet Wire for Glass-to-Metal Seal respectively.
Applications
4.1.2 One-, two-, or three-piece leads shall be designated
F30 Specification for Iron-Nickel Sealing Alloys according to the typical examples listed in Table 1.
F290 Specification for Round Wire for Winding Electron
Tube Grid Laterals
5. Materials
5.1 The material for a component lead section is generally
3. Dimensioning
designated by use of its chemical symbol.Anumerical suffix at
3.1 Diameter—The diameter shall be expressed in millime-
the end of the material designation preceded by “C” (coating)
tres. Three digits shall be used for all diameters under 1 mm
indicates percent of cladding or plating. For unspecified alloys,
and four or more digits shall be used for all diameters 1 mm
a numerical value between chemical symbols indicates the
and larger. A decimal point is understood to be present three
percent content of the material preceding the value.
places from the right.
5.2 Additional descriptive suffixes are given in Table 2.
5.3 Materials List— Commonly used lead wire materials
1 and their respective designations are listed in Table 3. Where
This practice is under the jurisdiction ofASTM Committee F01 on Electronics
and is the direct responsibility of Subcommittee F01.03 on Metallic Materials.
trade names are indicated, equivalent materials may be used.
Current edition approved May 1, 2013. Published May 2013. Originally
5.4 Annealing Treatments—For special applications it is
approved in 1967. Last previous edition approved in 2009 as F85 - 76 (2009). DOI:
10.1520/F0085-76R13.
sometimes desirable to have the entire lead, or certain parts,
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
with an extremely soft temper. To satisfy these conditions,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
standard treatments are available as follows:
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 5.4.1 Anneal Types:
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F85 − 76 (2013)
TABLE 1 Designation for One, Two, or Three-Piece Leads
Component Sections
No. of Inner lead Press of Seal Lead Outer Lead
Lead Wire Designation
Sections Dia Length Dia Length Dia Length
A A A
Material Material Material
mm mm mm mm mm mm
1 1524x21D . . . 1.524 21 D . . .
2 1016x25Ni–1524 1
...
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