ASTM C645-04a
(Specification)Standard Specification for Nonstructural Steel Framing Members
Standard Specification for Nonstructural Steel Framing Members
SCOPE
1.1 This specification covers nonstructural steel framing members in interior construction assemblies.
1.2 The values stated in inch-pound units are to be regarded as the standard. The SI (metric) values given in parentheses are for information purposes only.
1.3 The following safety hazards caveat pertains only to the test method portion, Sections 9 and 10, of this specification: 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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Designation: C 645 – 04a
Standard Specification for
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Nonstructural Steel Framing Members
This standard is issued under the fixed designation C 645; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope* 3. Terminology
1.1 This specification covers nonstructural steel framing 3.1 Definitions—Definitions shall be in accordance with
members in interior construction assemblies. Terminology C 11.
1.2 The values stated in inch-pound units are to be regarded 3.2 Definitions of Terms Specific to This Standard:
as the standard.The SI (metric) values given in parentheses are 3.2.1 members, n—in screw application of gypsum board,
provided for information purposes only. studs, runners (track), hat furring channels, main beams and
1.3 The following safety hazards caveat pertains only to the cross furring members of grid suspension systems or other
test methods portion, Sections 9 and 10, of this specification: items manufactured in accordance with this specification.
This standard does not purport to address all of the safety 3.2.2 nonstructural wall stud, n—a member in a steel
concerns, if any, associated with its use. It is the responsibility framed wall system which is limited to a lateral (transverse)
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of the user of this standard to establish appropriate safety and load of not more than 10 lb/ft (480 Pa), a superimposed
health practices and determine the applicability of regulatory verticalload,exclusiveofsheathingmaterials,ofnotmorethan
limitations prior to use. 100 lbf/ft (1460 N/m), or a superimposed vertical load of not
more than 200 lbs (890 N).
2. Referenced Documents
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4. Materials and Manufacture
2.1 ASTM Standards:
A 653/A 653M Specification for Zinc-Coated (Galvanized) 4.1 Members shall be manufactured from steel meeting the
or Zinc-Iron Alloy-Coated (Galvanized) by the Hot- requirements of Specification A 1003/A 1003M.
Dipped Process 4.2 Members shall have a protective coating conforming to
A 1003/A 1003M Specification for Steel Sheet, Carbon, Specification A 653/A 653M–G40 minimum or shall have a
Metallic- and Nonmetallic-Coated for Cold-Formed Fram- protective coating with an equivalent corrosion resistance.
ing Members 4.3 Members shall be manufactured from steel having a
C 11 Terminology Relating to Gypsum and Related Build- minimum thickness, individual measurement of 0.0179 in.
ing Materials and Systems (0.455 mm) before application of protective coating.
C 36 Specification for Gypsum Wallboard
5. Dimensions and Permissible Variations
C 1002 Specification for Steel Drill Screws for the Appli-
5.1 Studs and rigid furring channels shall have a configu-
cation of Gypsum Board or Metal Plaster Bases
2.2 AISI Standard: ration and steel thickness such that the system in which they
are used will carry the design transverse loads without exceed-
Specification for the Design of Cold-Formed Steel Struc-
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tural Members ing either the allowable stress of the steel or the allowable
design deflection. Main beams and cross furring of grid
suspension systems shall be limited to a deflection of L/240.
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This specification is under the jurisdiction of ASTM Committee C11 on
The manufacturer shall supply sufficient data for calculating
Gypsum and Related Building Materials and Systems and is the direct responsibility
design performance.
of Subcommittee C11.02 on Specifications and Test Methods for Accessories and
Related Products.
NOTE 1—Allowable deflection varies depending on the cladding used
Current edition approved Oct. 1, 2004. Published October 2004. Originally
and architectural requirements. Detailed requirements shall be specified in
approved in 1970. Last previous edition approved in 2004 as C 645 – 04.
2 application specifications.
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
5.1.1 Members, except main beams of grid suspension
Standards volume information, refer to the standard’s Document Summary page on
systems, shall be sufficiently rigid to permit penetration of the
the ASTM website.
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screw.
Available from the American Iron and Steel Institute, 1000 16th St. N.W.,
Washington, DC 20036.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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C 645 – 04a
TABLE 1 Manufacturing Tolerances
5.1.2 Minimum width of face to which gypsum board is
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screw-a
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