How is an aluminium tee-section designated under this standard?

By the prefix 'AT' followed by depth, flange width, and thickness in millimeters, for example, AT 50 x 50 x 5 (Clause 3).

What material grades should be used for these sections?

This standard refers to IS 733 for material specifications, which includes common grades like 6061, 6063, and 6082 in various tempers.

What is the tolerance on straightness for these sections?

Permissible deviation from straightness is 1.25 mm per metre length (Clause 6.3).

Where can I find the moment of inertia and other properties?

All sectional properties, including area, mass, moment of inertia (Ixx, Iyy), and radius of gyration (rxx, ryy) are listed in Table 1 for each standard section.

IS 6445

: 1985

Aluminium tee-sections

CurrentSpecializedSpecificationBIMStructural Engineering · Structural Engineering and Structural Sections

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This standard specifies the dimensions, mass, sectional properties, and manufacturing tolerances for a range of hot-rolled or extruded aluminium and aluminium alloy tee-sections. It provides a standard table of section profiles intended for use in structural and general engineering applications.

Aluminium tee-sections

Quick Reference Values

Mass of section AT 50 x 50 x 50.656 kg/m

Sectional area of section AT 50 x 50 x 52.43 cm²

Tolerance on depth/width for sections up to 75 mm± 0.8 mm

Tolerance on thickness for 3 mm to 6 mm± 0.4 mm

Standard length of sections3 m to 6 m

Practical Notes

Always specify the required material grade and temper (e.g., 6063-T6) along with the section designation, as properties vary significantly.

Refer to Table 1 for standard available sizes during the design phase to ensure material availability and cost-effectiveness.

These sections are ideal for applications requiring a good strength-to-weight ratio, such as architectural facades, window systems, and lightweight frames, but not typically for primary heavy-load-bearing structures.