ASTM C1002-22

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Designation: C1002 − 20 C1002 − 22
Standard Specification for
Steel Self-Piercing Tapping Screws for Application of
Gypsum Panel Products or Metal Plaster Bases to Wood
Studs or Steel Studs
This standard is issued under the fixed designation C1002; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This specification covers steel self-piercing tapping screws for use in fastening gypsum panel products and metal plaster bases
to cold-formed steel studs less than 0.033 in. (0.84 mm) in thickness and wood members, and for fastening gypsum panel products
to gypsum board.
1.2 This specification also covers test methods for determining performance requirements and physical properties.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.4 The following safety hazards caveat pertains only to the test methods described in 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, health, and environmental practices and determine the applicability of regulatory limitations prior
to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
A510/A510M Specification for General Requirements for Wire Rods and Coarse Round Wire, Carbon Steel, and Alloy Steel
A1040 Guide for Specifying Harmonized Standard Grade Compositions for Wrought Carbon, Low-Alloy, and Alloy Steels
C11 Terminology Relating to Gypsum and Related Building Materials and Systems
C475/C475M Specification for Joint Compound and Joint Tape for Finishing Gypsum Board
C645 Specification for Nonstructural Steel Framing Members
C847 Specification for Metal Lath
C1396/C1396M Specification for Gypsum Board
2.2 AISI Standard:
S220 North American Standard for Cold-Formed Steel Framing – Nonstructural Members
This specification is under the jurisdiction of ASTM Committee C11 on 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.
Current edition approved Oct. 1, 2020June 1, 2022. Published November 2020June 2022. Originally approved in 1983. Last previous edition approved in 20182020 as
C1002 – 18.C1002 – 20. DOI: 10.1520/C1002-20.10.1520/C1002-22.
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 Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Available from American Iron and Steel Institute (AISI), 25 Massachusetts Avenue, NW, Suite 800, Washington, DC 20001, https://www.steel.org.
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3. Terminology
3.1 Definitions:
3.1.1 For definitions relating to gypsum and related building materials and systems, see Terminology C11.
3.2 Definitions:
3.2 Definitions of Terms Specific to This Standard:
3.2.1 self-piercing, adj—the ability to penetrate without benefit of a pre-drilled hole with sharp-point angles of not more than 30°.
4. Classification
4.1 Steel screws covered by this specification are of four types of thread configurations:
4.1.1 Type G, coarse-pitch high-thread self-piercing screws for fastening gypsum board to gypsum board.
4.1.2 Type S, fine-thread screw for fastening gypsum board to cold formed steel members.
4.1.3 Type W, coarse-thread screw for fastening gypsum board to wood members.
4.1.4 Type A, coarse-pitch tapping screw thread for fastening metal plaster bases to wood or cold-formed steel.
5. Materials
5.1 Screws shall be made from steel wire manufactured in accordance with Specification A510/A510M.
5.1.1 Chemical composition for Type G and Type W screws shall be in accordance with Specification A1040, Grade 1013 to 1022.
5.1.2 Chemical composition for Type S and Type A screws shall be in accordance with Specification A1040, Grade 1018 to 1022.
6. Physical Properties
6.1 Hardness:
6.1.1 The surface of Type S, Type W, and Type A screws shall be case hardened to a depth of not less than 0.002 in. (0.05 mm)
with case hardness not less than 45 HRC.
6.1.2 The surface of Type G screws is not required to be case hardened.
6.2 Ductility—The screws shall have sufficient ductility to be able to withstand a 10° bend without visible signs of fracture when
tested as specified in 12.6.7.
7. Performance Requirements
7.1 Type G Screws:
7.1.1 Screws shall be able to self-pierce and drive into gypsum panel products.
7.1.2 Screw threads shall be adequate to pull the head of the screw below the surface of the gypsum panel product when tested
as specified in 12.6.2.
7.2 Type S Screws:
7.2.1 General—Screws shall be able to self-pierce and drive into cold-formed steel members in less than 2 s, when tested as
specified in 12.6.3.1.
7.2.2 Screws for Fastening Gypsum Panel Products—Screw threads shall be adequate to pull the head of the screw below the
surface of the gypsum panel product, without spin-out, when tested as specified in 12.6.3.
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7.3 Type W Screws:
7.3.1 General—Screw threads shall be able to self-pierce and drive into wood members.
7.3.2 Screws for Fastening Gypsum Panel Products—Screw threads shall be adequate to pull the head of the screw below the
surface of the gypsum panel product, without spin-out, when tested as specified in 12.6.6.
7.4 Type A Screws:
7.4.1 General—Screw shall be able to pierce and drive into wood or cold-formed steel members.
7.4.2 Screws for Fastening Metal Plaster Bases—Screw threads shall be adequate to pull a metal plaster base tightly enough
against the face of a wood or steel stud, without spin-out, so that when subjected to a steady pull, the plaster base will tear before
slipping out from under the screw head, when tested in accordance with 12.6.4 or 12.6.5.
8. Dimensions and Permissible Variations
8.1 Head Diameter:
8.1.1 General—Heads shall be permitted to be out of round not more than 0.02 in. (0.51 mm).
8.1.2 Screws for Fastening Gypsum Board—Not less than 0.315 in. (8 mm).
8.1.3 Screws for Fastening Metal Plaster Bases—Not less than 0.437 in. (11.1 mm).
8.2 Head Contour:
8.2.1 Screws for Fastening Gypsum Panel Products—The top of the head shall be flat. The outer flange thickness shall be
0.025 6 0.005 in. (0.64 6 0.13 mm). The contour beneath the flange head shall be such that the screw head shall be able to be
driven so that the head of the screw rests immediately below the surface of the gypsum panel product.
8.2.2 Screws for Fastening Metal Plaster Bases—The top of the screw shall be either flat or contoured. The underside of the head
shall be flat or near flat. The threads shall extend to the underside of the head.
8.3 Driving Recess:
8.3.1 Screws for Fastening Gypsum Board—No. 2 “Phillips” design, depth of recess, not less than 0.104 in. (2.64 mm).
8.3.2 Screws for Fastening Metal Plaster Bases—No. 2 “Phillips” design, depth of recess, not less than 0.077 in. (1.95 mm).
8.3.3 Determine depth of recess with a Phillips penetration depth gauge.
8.3.4 Other types of screw-driving recesses having performance values equal to those of the recesses specified are acceptable.
8.4 Shank Diameter—Not less than No. 6, with major diameter not less than 0.136 in. (3.45 mm).
8.5 Length:
8.5.1 Nominal Length—The nominal length shall be the minimum length.
8.5.2 Type W and Type A screws shall be long enough to penetrate wood members not less than ⁄8 in. (15.9 mm).
8.6 Threads—Either single or multiple thread design.
8.7 Points—Self-piercing design.
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9. Finish and Appearance
9.1 Form—The form shall be straight and neatly formed.
9.2 Threads—The threads shall be clean and smooth.
9.3 Finish—Screws shall have a corrosion-resistant treatment. The treatment shall not inhibit adhesion to finishing compounds nor
bleed through field-applied decoration.
10. Sampling
10.1 Obtain not less than 90 screws from not less than five containers.
11. Number of Tests and Retests
11.1 Test a minimum of five screws for each test. If any of the first lot fails, test 25 more screws.
11.2 If two or more of the second lot fail the second test, then the represented lot fails to meet the specified requirements.
12. Test Methods
12.1 The following test methods set forth procedures used to determine the ability of the screws to pierce through gypsum panel
and metal plaster base and into the backup material without spin-out.
12.1.1 These test methods can also be used to determine whether or not alternate screw driving recesses will have performance
values equal to those of the “Phillips” recess specified.
12.2 Significance and Use—These test methods provide procedures for evaluating the physical properties and performance
requirements of steel self-piercing screws. The degree of correlation between these tests and service performance has not been
determined.
12.3 Apparatus Shall Satisfy the Following:
12.3.1 Power driven Drill Screw Gun, capable of 4000 rpm (free spindle speed) with a depth-sensitive nose piece, supplied with
a screw driving bit to fit the screw used in the test.
12.3.2 Stop Watch, capable of being read to the nearest 0.1 s.
12.3.3 Vice—Standard machinists vice, not less than 3 in. (76 mm).
12.3.4 Clamp—Locking pliers (“Vice-Grip”), 6 in. (152 mm).
12.4 Materials:
12.4.1 Gypsum Wallboard—Specification C1396/C1396M, Type X, ⁄8 in. (16 mm) thick.
2 2
12.4.2 Metal Lath—Specification C847, diamond mesh, weight 2.5 lb/yd (1.4 kg/m ).
12.4.3 Steel Stud—Specification C645, or AISI S220, 0.0179 in. (0.455 mm) thick, hardness not less than 52 HRB, size 3 ⁄8 in.
(92.1 mm).
12.4.4 Wood Stud—Douglas fir, construction grade, 2 by 4 or 2 by 6, nominal, containing not less than 16 % nor more than 19 %
free moisture as determined by a suitable moisture meter.
12.4.5 Paper Joint Tape—Specification C475/C475M.
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12.5 Specimen Preparation:
12.5.1 For each test, one piece of gypsum wallboard, 6 in. (150 mm) square, shall be cut from not less than 12 in. (300 mm) from
the edge or end of the
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