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Technical Specifications: Lag Screws

Bolt
Diameter

Body Diameter
(Max/Min)

Head
Size
Head
Height

Threads
per Inch

1/2"
0.515 / 0.482
3/4"
11/32"
6
5/8"
0.642 / 0.605
15/16"
27/64"
5
3/4"
0.768 / 0.729
1-1/8"
1/2"
4-1/2
7/8"
0.895 / 0.852
1-5/16"
37.64"
4
1"
1.022 / 0.976
1-1/2"
43/64"
3-1/2

All of our 7/8" and 1" lag screws, and all lag screws 1/2" and up exceeding a length of 12" are provided in CONE POINT only. See the following illustration.
Cone point
A type of point with a cone shape that allows for deep penetration and is used for permanent location of parts.
Gimlet point
A type of point with a sharp tip used for penetrating wood. A gimlet point is designed for small-diameter screws so they can be installed without a pilot hole.

Our lag screws are manufactured to the standards of ASTM A307 of materials complying with ASTM A36.

Chemical and Mechanical Requirements per ASTM A307-07b*

1. Scope

1.1 This specification covers the chemical and mechanical requirements of three grades of carbon steel bolts and studs in sizes 1/4 in. through 4 in. The fasteners are designated by "Grade" denoting tensile strength and intended use, as follows:


Grade

Description

Grade A
Bolts and studs having a minimum tensile strength of 60 ksi and intended for general applications,
Grade B
Bolts and studs having a tensile strength of 60 to 100 ksi and intended for flanged joints in piping systems with cast iron flanges, and
Grade C
Replaced by Specification F 1554 Gr.36

Carbon structural steel shapes, plates, and bars of structural quality per ASTM A36*

1. Scope

1.1 This specification covers carbon steel shapes, plates, and bars of structural quality for use in riveted, bolted, or welded construction of bridges and buildings, and for general structural purposes.

1.2 Supplementary requirements are provided for use where additional testing or additional restrictions are required by the purchaser. Such requirements apply only when specified in the purchase order.

1.3 When the steel is to be welded, a welding procedure suitable for the grade of steel and intended use or service is to be utilized. See Appendix X3 of Specification A 6/A 6M for information on weldability.

1.4 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system is to be used independently of the other, without combining values in any way.

1.5 The text of this specification contains notes or footnotes, or both, that provide explanatory material. Such notes and footnotes, excluding those in tables and figures, do not contain any mandatory requirements.

1.6 For structural products produced from coil and furnished without heat treatment or with stress relieving only, the additional requirements, including additional testing requirements and the reporting of additional test results, of A 6/A 6M apply.

*This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty, express or implied, or make any representation that the contents of this abstract are accurate, complete, or up-to-date.

Last update: Aug 21, 2012
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