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Hot-rolled steel sections shaped like an L, with two legs at right angles, either equal or unequal in length. Angles are the most versatile of the structural sections: they brace frames, carry transmission towers, make lintels, trusses and supports, and are the stock material of every fabrication shop.
An angle is two flat legs joined at a right angle along a rounded root. It is light, easy to cut, drill and weld, and can be bolted back to back or to a gusset plate, which is why it is used for bracing and truss members, the lattice of electricity transmission and telecom towers, lintels over openings, shelf and cable-tray supports, frames for doors and machinery, and as the raw material for countless fabricated parts.
Angles are rolled from billets on section and merchant-bar mills: small sizes on light mills alongside flats and rounds, large sizes on medium and heavy section mills. A size is given as leg × leg × thickness — L 75 × 75 × 8 — and each leg length is rolled in several thicknesses, so the mass per metre rises with thickness while the outside size stays the same.
An angle does not bend about its legs but about its own principal axes, which lie at 45° to the legs of an equal angle. The minor axis is much the weakest, so a single angle used as a strut is limited by buckling about that axis — a point designers check and buyers should not substitute away from by changing a size or a thickness.
In the GCC angles are used in large tonnages for building steelwork, transmission and telecom lines, and the fabrication of tanks, skids and supports. Specifications follow European (EN 10056 sizes, S275 and S355 grades), British or American (ASTM A6 sizes, A36 grade) practice, and material is both rolled in the region and imported from Turkey, China, India, the Far East and Europe. MESteel publishes a monthly angle import price.
Angles are quoted by leg lengths and thickness in millimetres (L 100 × 100 × 10) or, in American practice, in inches (L4 × 4 × 3/8). Unequal angles name the long leg first. The mass per metre for each size is in the tables below and can be worked out with the steel weight calculator.
Full dimensions: Equal and unequal angles (EN 10056-1, formerly DIN 1028 and DIN 1029) · American angles (ASTM A6)
| Region | Standard | What it covers |
|---|---|---|
| Europe | EN 10056-1 CEN-CENELEC |
Structural steel equal and unequal leg angles — dimensions |
| Europe | EN 10056-2 CEN-CENELEC |
Structural steel equal and unequal leg angles — tolerances on shape and dimensions |
| Europe | EN 10025-2 CEN-CENELEC |
Hot-rolled products of structural steels — non-alloy structural steels (S235, S275, S355) |
| Germany | DIN 1028 DIN replaced by EN 10056-1 |
Equal-leg angles — dimensions |
| Germany | DIN 1029 DIN replaced by EN 10056-1 |
Unequal-leg angles — dimensions |
| UK | BS 4848-4 BSI replaced by EN 10056-1 |
Hot-rolled structural steel sections — equal and unequal angles |
| USA | ASTM A6/A6M ASTM |
General requirements for rolled structural steel — angle dimensions and tolerances |
| USA | ASTM A36/A36M ASTM |
Carbon structural steel — the usual grade for angles in American practice |
| Japan | JIS G3192 JSA |
Dimensions, mass and permissible variations of hot-rolled steel sections, including angles |
| China | GB/T 706 SAC |
Hot-rolled section steel — I-beams, channels and angles |
| India | IS 808 BIS |
Dimensions for hot-rolled steel beam, column, channel and angle sections |
| Russia / CIS | GOST 8509 | Hot-rolled equal-leg steel angles — dimensions |
| Russia / CIS | GOST 8510 | Hot-rolled unequal-leg steel angles — dimensions |
Grade equivalents and the standards bodies: Steel grades & standards
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