# Angle sections

L-shaped stock: dimensional conventions, rolled versus formed products, section properties, connections and procurement limits.

Reviewed: 2026-11-01

Tags: materials, stock-forms, structural-sections, angles

## Geometry is separate from material grade

British Steel's **120 × 120 × 8 mm equal angle** lists **14.7 kg/m** and **18.7 cm²** area. Its listed second moment is **256 cm⁴** about geometric x/y axes, versus **411 and 107 cm⁴** about principal u/v axes. Use the table's axis sketch before transferring a value into a calculation. [British Steel section table](https://www.britishsteel.co.uk/wp-content/uploads/2026/07/EA-datasheet-21.07.26.pdf)

An angle section has two legs meeting at a corner, usually shown as an L-shaped section. Equal angles have equal leg widths; unequal angles have different widths. A designation such as **120 × 120 × 8 mm** describes nominal leg dimensions and thickness, not material strength. British Steel's equal-angle drawing also identifies the root and toe radii, which are part of the actual rolled geometry. [British Steel equal-angle datasheet, p. 1](https://www.britishsteel.co.uk/wp-content/uploads/2026/07/EA-datasheet-21.07.26.pdf)

For an unequal angle, identify which leg is attached, its orientation and the datum used for hole locations. A drawing that lists two leg dimensions but omits orientation can still leave the assembly ambiguous. Include cut length, end condition and any handed fabrication details.

## Rolled, pressed and fabricated products

ArcelorMittal's section range lists European hot-rolled equal and unequal angles with **EN 10056-1 dimensions**, **EN 10056-2 tolerances** and separate steel-grade standards. It lists American angle dimensions and tolerances separately under ASTM A6/A6M. A nominally similar catalogue size is therefore not proof of identical dimensional acceptance. [ArcelorMittal section range](https://sections.arcelormittal.com/products_and_solutions/EN)

Angles are also supplied through other routes. Nationwide Stainless explicitly distinguishes its **cold-formed/pressed angles**, with custom holes and slots, from hot-rolled and laser-fusion-welded sections. Those are distinct products, not interchangeable ways of describing one table row. [Nationwide Stainless angle products](https://www.nationwidestainless.co.uk/products/cold-formed-angles/)

## Dimensions and tolerances

The publisher records distinguish **EN 10056-1:2017, dimensions**, from **EN 10056-2:1993, tolerances on shape and dimensions**. A newer Part 1 date does not imply Part 2 has the same edition year. [DIN Part 1 record](https://www.dinmedia.de/de/norm/din-en-10056-1/256887676); [DIN Part 2 record](https://www.dinmedia.de/en/standard/din-en-10056-2/2236648)

Specify the applicable limits for leg dimensions, thickness, squareness, straightness and length.

Check the corner where mating parts must fit. A square-edged plate pushed into a rolled angle's root may interfere with the fillet even when both leg dimensions are correct. Define any clearance, coping or machining on the fabrication drawing rather than assuming the ideal CAD corner exists in stock.

## Read section properties with their axes

British Steel's published **120 × 120 × 8 mm equal angle** has mass **14.7 kg/m**, area **18.7 cm²**, root radius **13 mm** and toe radius **6.5 mm**. Its second moments of area differ by axis: **256 cm⁴** about the listed geometric x/y axes, versus **411 cm⁴** and **107 cm⁴** about the u/v principal axes. Keep the drawing's axis definitions with any copied value. [British Steel dimensions and properties, pp. 1–2](https://www.britishsteel.co.uk/wp-content/uploads/2026/07/EA-datasheet-21.07.26.pdf)

A single angle should not be treated as a symmetric rectangular beam. ANSI/AISC 360-22 §F10 distinguishes geometric-axis design with continuous lateral-torsional restraint from principal-axis design without that restraint, subject to its exceptions. It considers yielding, lateral-torsional buckling and leg local buckling; combined loading has additional provisions. These are design-rule boundaries, not a capacity table for every angle application. [AISC 360-22, §F10, August 1, 2022](https://vpn2.modernsteel.com/globalassets/product-files-not-searched/publications/standards/a360-22w.pdf)

Before choosing a property, establish load direction, restraints, span and connection geometry. A larger tabulated principal-axis inertia is not automatically available for loading along a leg. For compression, also establish the effective member behavior under the adopted design rules. A material yield value and gross area alone do not establish buckling resistance.

## Connections and fabrication

AISC's commentary on single-angle behavior explains that transverse loads applied away from the shear center can introduce torsion when twisting is unrestrained. A connection through one leg therefore deserves more than an assumed concentric-load check. [AISC 360-16 commentary, §G3](https://www.aisc.org/globalassets/aisc/publications/standards/a360-16-spec-and-commentary_june-2018.pdf)

Define bolt gauge, edge distances, hole sizes, weld access and the actual load path. Check the member and connection as a system, including eccentricity, net-section effects and the applicable failure modes. Two angles placed together do not automatically act as a fully connected built-up section; the connecting details and design basis must support that assumption.

## Bounded estimate

For **six 2.4 m lengths** of the cited British Steel 120 × 120 × 8 section, the nominal mass estimate is `6 × 2.4 × 14.7 = 211.68 kg`. This excludes packaging, coatings, holes, cutting losses and dimensional/mass tolerances. It is a purchasing estimate, not a measured shipment mass.

An ideal sharp-corner area calculation gives `8 × (120 + 120 − 8) = 1856 mm²`, or **18.56 cm²**, compared with the producer's **18.7 cm²**. The small difference demonstrates why an ideal rectangle model should not replace the published rolled-section geometry. Neither area establishes a safe load without the material, stability, connection and design requirements.

## Source versions and purchase record

British Steel's inspected sheet prints **CEAD:ENG:072026** and **©2026**. The cited standards distinguish **EN 10056-1:2017** and **EN 10056-2:1993**. AISC's principal-axis reference is **360-22, August 1, 2022**; the separate shear/torsion explanation is explicitly from the **360-16 commentary**. The live ArcelorMittal and Nationwide pages have no issue date asserted here.

Retain producer, material grade and standard, route, section designation, ordered tolerances, length, finish, certificate and fabrication drawing. Verify availability and binding properties at order rather than treating a catalogue row as a stock or performance guarantee.

See also [Stock forms and dimensions](index.md).