ASTM C955-00a
(Specification)Standard Specification for Load-Bearing (Transverse and Axial) Steel Studs, Runners (Tracks), and Bracing or Bridging for Screw Application of Gypsum Panel Products and Metal Plaster Bases
Standard Specification for Load-Bearing (Transverse and Axial) Steel Studs, Runners (Tracks), and Bracing or Bridging for Screw Application of Gypsum Panel Products and Metal Plaster Bases
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1.1 This specification covers steel studs, runners (tracks), and bracing or bridging (with a base metal thickness range of not less than 0.0329 in. (0.836 mm)) for screw application of gypsum panel products and metal plaster bases in load-bearing (transverse and axial) construction assemblies. Steel of lesser thickness shall be permitted in additional engineered products.
1.2 The values stated in inch-pound units are to be regarded as the standard. The S1 (metric) values given in parentheses are for information purposes only.
1.3 The following precautionary caveat pertains only to the test method portion, Section 8, 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 955 – 00a
Standard Specification for
Load-Bearing (Transverse and Axial) Steel Studs, Runners
(Tracks), and Bracing or Bridging for Screw Application of
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 * 3. Terminology
1.1 This specification covers steel studs, runners (tracks), 3.1 Definitions: Definitions shall be in accordance with
and bracing or bridging (with a base metal thickness range of Terminology C 11.
not less than 0.0329 in. (0.836 mm)) for screw application of 3.2 Definitions of Terms Specific to This Standard:
gypsum panel products and metal plaster bases in load-bearing 3.2.1 members , n—studs, runners, tracks, bracing, bridg-
(transverse and axial) construction assemblies. Steel of lesser ing, accessories or other items manufactured in accordance
thickness shall be permitted in additional engineered products. with this standard.
1.2 The values stated in inch-pound units are to be regarded 3.2.2 structural member, n—a member in a steel framed
as the standard. The SI (metric) values given in parentheses are system in which the loading exceeds any of the following
provided for information purposes only. conditions: a transverse load of 20 lbf/ft (290 N/m) of member
1.3 The following precautionary caveat pertains only to the length, or an axial load, exclusive of sheathing, of 200 lbf (890
test method portion, Section 8, of this specification: This N) per member.
standard does not purport to address all of the safety concerns,
4. Materials and Manufacture
if any, associated with its use. It is the responsibility of the user
4.1 The mechanical properties of the steel shall meet the
of this standard to establish appropriate safety and health
practices and determine the applicability of regulatory limita- requirements of the AISI Specification for the Design of
Cold-Formed Steel Structural Members.
tions prior to use.
4.2 The minimum steel thickness (base steel) shall be not
2. Referenced Documents
less than 0.0329 in. (0.84 mm).
2.1 ASTM Standards: 4.3 Individual measurements before the application of pro-
A 653/A 653M Specification for Steel Sheet, Zinc-Coated tective coating shall be not less than 95 % of the specified
(Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) design thickness.
by the Hot-Dipped Process 4.4 Members shall have a protective coating conforming to
C 36 Specification for Gypsum Wallboard Specification A 653/A 653M, G60 minimum, or equivalent
C 954 Specification for Steel Drill Screws for the Applica- corrosion resistance, or shall have a rust-inhibitive coating
tion of Gypsum Panel Products or Metal Plaster Bases to providing equivalent corrosion resistance.
Steel Studs from 0.033 in. (0.84 mm) to 0.112 in. (2.84 4.5 Edges of members shall be manufactured to minimize
mm) in Thickness burrs and sharp edges.
2.2 AISI Standard: 4.6 Factory punch-outs, when provided, shall be located
Specification for the Design of Cold-Formed Steel Struc- along the centerline of the webs of members and shall have
tural Members 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
member depth, d, or 2 ⁄2 in. (64 mm). Web punch-out length
This specification is under the jurisdiction of ASTM Committee C11 on
shall not exceed 4 ⁄2 in. (114 mm). Minimum distance between
Gypsum and Related Building Materials and Systems and is the direct responsibility
the end of the member and the near edge of the web punch-out
of Subcommittee C11.02 on Specifications and Test Methods for Accessories and
Related Products. shall be 10 in. (254 mm). The size of the factory punch-outs
Current edition approved July 10, 2000. Published September 2000. Originally
shall not exceed the size used in design and the center-to-center
published as C 955 - 81. Last previous edition C 955 - 00.
spacing shall not be less than that used in design.
Annual Book of ASTM Standards, Vol 01.06.
4.7 The sectional properties of members shall be computed
Annual Book of ASTM Standards, Vol 04.01.
Available from the American Iron and Steel Institute, 1000 16th St., N.W.,
in accordance with the AISI Specification for the Design of
Washington, DC 20036.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
C 955
TABLE 1 Manufacturing Tolerances
Cold-Formed Steel Structural Members.
Structural Studs, Structural Track,
A
Dimension Item Checked
in. (mm) in. (mm)
5. Performance Requirements
3 1
A length + ⁄32 (2.38) + ⁄2 (12.7)
5.1 When tested in accordance with Section 8, members
3 1
− ⁄32 (2.38) − ⁄4 (6.35)
shall be capable of pulling the head of the screw below the
B
1 1
B web width + ⁄32 (0.79) + ⁄32 (0.79)
1 1
surface of the gypsum panel product without spin out (see Fig. − ⁄32 (0.79) + ⁄8 (3.18)
C flare + ⁄16 (1.59) + 0 (0)
1).
1 3
overbend − ⁄16 (1.59) − ⁄32 (2.38)
D hole center + ⁄16 (1.59) NA
6. Dimensions and Permissible Variations
width − ⁄16 (1.59)
E hole center + ⁄4 (6.35) NA
6.1 Data for calculating design performance shall be sup-
length − ⁄4 (6.35)
plied by the manufacturer. 1 1
F crown + ⁄16 (1.59) + ⁄16 (1.59)
1 1
− ⁄16 (1.59) − ⁄16 (1.59)
6.2 The width of the surface to which the sheathing board is
1 1
G camber ⁄32 per ft (0.79) ⁄32 per ft (0.79)
attached shall be not less than 1 ⁄4 in. (32 mm).
1 1
⁄2 max (12.7) ⁄2 max (12.7)
1 1
6.3 Runners (track) shall be formed in a U-shaped configu-
H bow ⁄32 per ft (0.79) ⁄32 per ft (0.79)
1 1
⁄2 max (12.7) ⁄2max (12.7)
ration, having a depth compatible with that of the studs of the
1 1
I twist ⁄32 per ft (0.79) ⁄32 per ft (0.79)
same nominal size.
1 1
⁄2 max (12.7) ⁄2 max (12.7)
6.4 Minimum height of runner (track) flanges shall be ⁄4 in.
A
All measurements shall be taken not less than 1 ft (305 mm) from the end.
B
(19 mm).
Outside dimension for stud; inside for track.
6.5 Members shall be manufactured within the l
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