ASTM C645-07a

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: C 645 – 07a
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* SpecificationfortheDesignofCold-FormedSteelStructural
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Members
1.1 This specification covers nonstructural steel framing
members in interior construction assemblies.
3. Terminology
1.2 The values stated in inch-pound units are to be regarded
3.1 Definitions—Definitions shall be in accordance with
as the standard.The SI (metric) values given in parentheses are
TerminologyC11.
provided for information purposes only.
3.2 Definitions of Terms Specific to This Standard:
1.3 The following safety hazards caveat pertains only to the
3.2.1 members, n—in screw application of gypsum board,
test methods portion, Sections 9 and 10, of this specification:
studs, runners (track), hat furring channels, main beams and
This standard does not purport to address all of the safety
cross furring members of grid suspension systems or other
concerns, if any, associated with its use. It is the responsibility
items manufactured in accordance with this specification.
of the user of this standard to establish appropriate safety and
3.2.2 nonstructural wall stud, n—a member in a steel
health practices and determine the applicability of regulatory
framed wall system which is limited to a lateral (transverse)
limitations prior to use.
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load of not more than 10 lb/ft (480 Pa), a superimposed
2. Referenced Documents verticalload,exclusiveofsheathingmaterials,ofnotmorethan
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100 lbf/ft (1460 N/m), or a superimposed vertical load of not
2.1 ASTM Standards:
more than 200 lbs (890 N).
A 653/A 653M Specification for Steel Sheet, Zinc-Coated
(Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed)
4. Materials and Manufacture
by the Hot-Dip Process
4.1 Members shall be manufactured from steel meeting the
A 1003/A 1003M Specification for Steel Sheet, Carbon,
requirements of Specification A 1003/A 1003M.
Metallic- and Nonmetallic-Coated for Cold-Formed Fram-
4.2 Members shall have a protective coating conforming to
ing Members
Specification A 653/A 653M – G 40 minimum or shall have a
C11 Terminology Relating to Gypsum and Related Build-
protective coating with an equivalent corrosion resistance.
ing Materials and Systems
4.3 Members shall be manufactured from steel having a
C 1396/C 1396M Specification for Gypsum Board
minimum thickness, individual measurement of 0.0179 in.
C 754 Specification for Installation of Steel Framing Mem-
(0.455 mm) before application of protective coating.
bers to Receive Screw-Attached Gypsum Panel Products
C 1002 Specification for Steel Self-Piercing Tapping
5. Dimensions and Permissible Variations
Screws for the Application of Gypsum Panel Products or
5.1 Studs and rigid furring channels shall have a configu-
Metal Plaster Bases to Wood Studs or Steel Studs
ration and steel thickness such that the system in which they
2.2 AISI Standard:
are used will carry the design transverse loads without exceed-
ing either the allowable stress of the steel or the allowable
design deflection. Main beams and cross furring of grid
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This specification is under the jurisdiction of ASTM Committee C11 on suspension systems shall be limited to a deflection of L/240.
Gypsum and Related Building Materials and Systems and is the direct responsibility
The manufacturer shall supply sufficient data for calculating
of Subcommittee C11.02 on Specifications and Test Methods for Accessories and
design performance.
Related Products.
Current edition approved Aug. 1, 2007. Published August 2007. Originally
NOTE 1—Allowable deflection varies depending on the cladding used
approved in 1970. Last previous edition approved in 2007 as C 645 – 07.
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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
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Standards volume information, refer to the standard’s Document Summary page on Available from American Iron and Steel Institute (AISI), 1140 Connecticut
the ASTM website. Ave., NW, Suite 705, Washington, DC 20036, http://www.steel.org.
*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 – 07a
and architectural requirements. Detailed requirements shall be specified in TABLE 1 Manufacturing Tolerances
a
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