ASTM C 1623 : 2026

1.1This specification covers dry-cast concrete masonry lintels (beams) that are solid in cross-section, are reinforced for flexure, and are machine-made from hydraulic cement, water, and suitable mineral aggregates with or without the inclusion of other materials. These lintels are suitable for both loadbearing and nonloadbearing applications.

1.2Concrete masonry lintels covered by this specification are made from lightweight or normal weight aggregates, or both.

1.3This specification does not address the design or analysis of lintel capacity. Structural evaluations must be performed separately. The strength of a lintel is a function of factors including, but not limited to, the characteristics of the materials used in manufacturing (concrete materials and reinforcement), the amount and location of reinforcement, and the manufacturing and curing procedures. For design and analysis methods, refer to Building Code Requirements for Masonry Structures, TMS 402.

1.4This specification does not cover U-shaped lintels or those of other cross-sections that are not 100 % solid.

1.5This specification does not cover grouted concrete masonry lintels, or precast or cast-in-place lintels using wet-cast concrete.

1.6The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.

1.7The 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.

1.8This 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.