Steel Angle Iron Sizes, Types & Uses: A Buyer's Guide

If you're framing up a trailer, building pipe stands, welding brackets, or reinforcing a structure, angle iron is probably on your cut list. It's one of the most versatile structural shapes out there — strong, affordable, and easy to work with.

But with different leg sizes, thicknesses, materials, and grades available, picking the right steel angle iron for your project isn't always straightforward. This guide breaks down everything you need to know to buy steel angle with confidence.

What Is Steel Angle Iron?

Steel angle — commonly called "angle iron" — is a structural steel product with an L-shaped cross section. The two flat surfaces (called legs) meet at a 90-degree corner, creating a shape that resists bending and distributes load efficiently relative to its weight.

Each piece of angle is defined by three dimensions: leg height (the width of each side of the L), thickness (how thick the steel is), and length (how long the bar runs, typically sold in 20-foot lengths). A piece labeled 2" × 2" × 1/4" has two 2-inch legs and is 1/4-inch thick.

Equal Leg vs. Unequal Leg Angle

There are two main types of steel angle iron:

• Equal leg angle has both legs the same length — for example, 2" × 2" or 4" × 4". This is the most common type and works well for general framing, bracing, and fabrication.
• Unequal leg angle has legs of different lengths — for example, 3" × 2" or 4" × 3". These are used when you need a wider mounting surface on one side, or when design clearances require an asymmetric profile.

For most shop and field applications, equal leg angle is what you'll reach for. Unequal leg is more common in engineered structural applications.

Common Steel Angle Iron Sizes

Here are the most frequently ordered sizes and their approximate weights per foot:

Sizes range all the way from 1/2" × 1/2" up to 8" × 8" legs, with thicknesses from 1/8" to over 1". If you're not sure what size you need, our sales team can help you pick the right one based on your application and load requirements.

Steel Angle Grades and Materials

A36 Carbon Steel (Most Common)

ASTM A36 is the standard structural steel grade for angle iron. With a yield strength of 36,000 psi, it's strong enough for the vast majority of construction and fabrication work. It welds easily, machines well, and costs less than specialty grades. If no grade is specified on your plans, A36 is almost always what's called for.

A572 Grade 50 (Higher Strength)

When you need more load-bearing capacity without stepping up to a larger section, A572 Grade 50 delivers a yield strength of 50,000 psi. It's commonly specified for structural steel connections, heavy equipment, and engineered applications where weight savings matter.

Stainless Steel Angle (304 and 316)

For applications exposed to moisture, chemicals, or food-contact environments, stainless steel angle is the way to go. Grade 304 handles most corrosive environments, while 316 adds molybdenum for superior resistance to saltwater and harsh chemicals. We carry stainless angle in a range of sizes.

Aluminum Angle (6061-T6)

When weight is a concern — think marine, aerospace, or portable equipment — aluminum angle provides the L-shape profile at roughly one-third the weight of steel. We stock aluminum angle alongside our steel inventory.

Galvanized Angle

Hot-dip galvanized angle comes with a zinc coating that protects against rust and weathering. It's a solid choice for outdoor structures, agricultural equipment, and any application where painting isn't practical.

Common Uses for Steel Angle Iron

Angle iron shows up in nearly every trade. Here are the applications we see most from our customers:

• Structural framing and bracing — cross bracing in buildings, support frames for mezzanines, and column connections
• Trailer and equipment frames — angle is the backbone of utility trailers, equipment racks, and mobile platforms
• Brackets and supports — shelf brackets, pipe stands, motor mounts, and equipment guards
• Lintels — steel angles above door and window openings in masonry walls carry the load of the wall above
• Farm and ranch — gate frames, fence corners, equipment repairs, and livestock pen construction
• Fabrication projects — welding tables, jigs, fixtures, and shop furniture

How to Choose the Right Angle for Your Project

Picking the right size comes down to three things:

1. Load requirements — What weight or force does the angle need to support? For engineered applications, your plans will specify the size. For shop projects, a good rule of thumb is to go one size up from what feels right.
2. Connection method — If you're bolting, make sure the leg width gives you enough room for bolt holes without compromising strength. If you're welding, A36 and A572 are both easy to weld with standard MIG or stick processes.
3. Environment — Indoor and dry? Standard A36 with paint works fine. Outdoor, wet, or corrosive? Consider galvanized, stainless, or aluminum depending on your budget and performance needs.

When in doubt, give us a call. We've been helping contractors and fabricators in Oregon pick the right steel since 1938 — we're happy to talk through your application.

Processing Services That Save You Time

One advantage of buying angle from a full-service supplier is getting it cut and processed before it hits your shop. At Ram Steelco, we offer:

• Saw cutting — precision cuts to your specified lengths, so you're not paying for drops or spending time cutting on site
• Shearing — fast, clean cuts for lighter gauge angle
• Laser cutting — when you need holes, slots, or complex cutouts in your angle, our laser cuts it with tight tolerances and clean edges
• Plasma cutting — ideal for heavier sections or when you need fast turnaround on custom shapes
• Forming — need your angle bent or rolled? We handle that in-house too

Getting your angle cut to length and processed before delivery means less labor, less waste, and faster project completion.

Get a Quote on Steel Angle Iron

Whether you need a few sticks of 2" × 2" angle for a shop project or a full order of 6" × 6" structural angle for a commercial build, we've got it in stock and ready to go.

• Request a quote online — fast response, no hassle
• Call us directly at (503) 288-3401
• Visit our Portland warehouse — see the inventory yourself and talk to our sales team face to face

Ram Steelco is a locally owned steel and metals supplier in Portland, Oregon, serving contractors, fabricators, and builders since 1938.