ASTM C955-03

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Designation: C 955 – 03
Standard Specification for
Load-Bearing (Transverse and Axial) Steel Studs, Runners
(Tracks), and Bracing or Bridging for Screw Application of
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Gypsum Panel Products and Metal Plaster Bases
This standard is issued under the fixed designation C 955; 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.
1. Scope* 2.2 AISI Standard:
Specification for the Design of Cold-Formed Steel Struc-
1.1 This specification covers steel studs, runners (tracks),
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tural Members
and bracing or bridging (with a base metal thickness range of
2.3 ISO Standard:
not less than 0.0329 in. (0.836 mm)) for screw application of
ISO 9223 Corrosion of Metals and Alloys—Corrosivity of
gypsum panel products and metal plaster bases in load-bearing
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Atmosphers—Classification
(transverse and axial) construction assemblies. Steel of lesser
thickness shall be permitted in additional engineered products.
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
Terminology C 11.
provided for information purposes only.
3.2 Definitions of Terms Specific to This Standard:
1.3 The following precautionary caveat pertains only to the
3.2.1 members, n—studs, runners, tracks, bracing, bridging,
test method portion, Section 8, of this specification: This
accessories or other items manufactured in accordance with
standard does not purport to address all of the safety concerns,
this standard.
if any, associated with its use. It is the responsibility of the user
3.2.2 structural member, n—a member in a steel framed
of this standard to establish appropriate safety and health
system in which the loading exceeds any of the following
practices and determine the applicability of regulatory limita-
conditions: a transverse load of 20 lbf/ft (290 N/m) of member
tions prior to use.
length, or an axial load, exclusive of sheathing, of 200 lbf (890
2. Referenced Documents N) per member.
2.1 ASTM Standards:
4. Materials and Manufacture
A 792/A 792M Specification for Steel Sheet, 55 % Alumi-
2 4.1 Members shall be manufactured from steel meeting the
num–Zinc Alloy-Coated by the Hot-Dip Process
requirements of Specification A 1003/A 1003M.
A 875/A 875M Specification for Steel Sheet, Zinc-5 %Alu-
2 4.2 The minimum steel thickness (base steel) shall be not
minum Alloy-Coated by the Hot-Dip Process
less than 0.0329 in. (0.84 mm).
A 1003/A 1003M Specification for Steel Sheet, Carbon,
4.3 Individual measurements before the application of pro-
Metallic and Non-Metallic Coated for Cold-Formed Fram-
2 tective coating shall be not less than 95 % of the specified
ing Members
design thickness.
C 11 Terminology Relating to Gypsum and Related Build-
3 4.4 Members shall have a protective coating in accordance
ing Materials and Systems
with Table 1, CP 60 minimum.
C 954 Specification for Steel Drill Screws for the Applica-
4.5 Edges of members shall be manufactured to minimize
tion of Gypsum Panel Products or Metal Plaster Bases to
burrs and sharp edges.
Steel Studs from 0.033 in. (0.84 mm) to 0.112 in. (2.84
3 4.6 Factory punch-outs, when provided, shall be located
mm) in Thickness
along the centerline of the webs of members and shall have
center-to-center spacing of not less than 24 in. (610 mm). Web
punch-outs maximum width shall be the lesser of 0.5 times the
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This specification is under the jurisdiction of ASTM Committee C11 on
member depth, d, or 2 ⁄2 in. (64 mm). Web punch-out length
Gypsum and Related Building Materials and Systems and is the direct responsibility
of Subcommittee C11.02 on Specifications and Test Methods for Accessories and
Related Products.
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Current edition approved June 10, 2003. Published August 2003. Originally Available from the American Iron and Steel Institute, 1000 16th St., N.W.,
approved in 1981. Last previous edition approved in 2001 as C 955 - 01. Washington, DC 20036.
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Annual Book of ASTM Standards, Vol 01.06. Available from International Organization for Standardization, 1, Rue de
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Annual Book of ASTM Standards, Vol 04.01. Varembé, Case Postale 56, CH-1211, Geneva 20, Switzerland.
*A Summary of Changes section appears at the end of this standard.
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C955–03
TABLE 1 Coating Designations
Minimum Coating Requirements
Coating Coating
A B C D
Classification Designator
Zinc-Coated Zinc Iron 55 % Al-Zinc Zinc-5 %
Metallic Coat
...