For home welders, Online Metals and Metals Depot win on small-quantity mild steel, Midwest Steel undercuts on cut-to-size aluminum, and McMaster-Carr beats everyone on speed and catalog depth at a premium. Most hobby orders land at one of these four.
I have shipped steel and aluminum to my Sweden bench from every major online metal house at one point or another, usually because a local yard could not cut a clean 18-inch piece of 4140 or stock the exact 6061 angle I needed for a fixture. Buying metal online is rarely the cheapest route per pound, but for specialty alloys, exact cut lengths, and anything you cannot drive home in a car, it is the only sane option. This guide ranks the four suppliers I reach for most, what each one is actually good at, and where the shipping math quietly eats your savings. For the full picture on every buying channel, start with my where to buy steel for welding projects guide.
Which Online Metal Supplier Is Best for Home Welders?
Online Metals suits the widest range of hobby orders with deep stainless and aluminum stock and to-the-inch cutting. Metals Depot wins on structural mild steel in small lots. Midwest Steel often has the lowest aluminum pricing. McMaster-Carr is fastest but most expensive.
There is no single winner because each house optimizes for a different buyer. Online Metals (owned by a large industrial materials group) is built for cut-to-size precision orders. Metals Depot grew out of selling structural steel in quantities a fabricator would laugh at — exactly what a hobbyist wants. Midwest Steel & Aluminum runs lean and passes the savings to aluminum and steel cut pieces. McMaster-Carr is the Amazon of industrial supply: order before lunch, it can land next day, but you pay for that catalog and that speed. I rotate between all four depending on what the project needs.
Online Metals: The Cut-to-Size All-Rounder
Online Metals (onlinemetals.com) is my default for anything that needs a precise cut length or an alloy a local yard does not keep. It carries mild steel, stainless 304 and 316, aluminum 6061 and 5052, brass, copper, and titanium, and cuts most stock to the inch for a modest charge per cut.
The strength here is breadth plus precision. When I need exactly 11.5 inches of 0.25-inch wall 6061 square tube for a bracket, Online Metals cuts and ships it without a 20-foot minimum. The stainless inventory is the deepest of the four, which matters if you weld food-contact projects with the right filler and gas. The weakness is price: per-pound rates run well above a local supplier, and shipping on long stock climbs fast. For a handful of short specialty pieces, that is fine. For 80 pounds of mild flat bar, drive to a yard.
Metals Depot: Small Quantities of Structural Steel
Metals Depot (metalsdepot.com) shines when you want known structural mild steel — certified A36, 1018, or 1045 — in quantities too small for a commercial supplier to bother with. It is the easiest online source for buying one stick of angle iron or a single plate without a minimum order.
For load-bearing builds where the alloy actually matters, this is the advantage online has over a scrap yard. A scrap-yard mystery bar might be A36 or it might be something brittle; Metals Depot tells you the grade. That certainty is worth paying for on a trailer tongue or a stand that carries weight. If you are working with reclaimed metal instead, my guide on identifying mystery steel from a scrap yard covers the spark and magnet tests I use. Metals Depot pricing on plain mild stock is reasonable for online, but again, shipping length is the silent cost.
Midwest Steel and McMaster-Carr: Value vs Speed
Midwest Steel & Aluminum (midweststeelsupply.com) frequently posts the lowest cut-to-size aluminum pricing of the four and runs free-shipping thresholds that make medium orders competitive. McMaster-Carr (mcmaster.com) is the opposite trade-off: premium pricing, an enormous catalog, and shipping speed nothing else matches.
Midwest is where I look first for 6061 and 5052 aluminum cut pieces, because aluminum freight is brutal and any shipping break helps. McMaster-Carr I treat like an emergency tool: when a project is stalled waiting on one weird piece — a specific hex bar, a precise wall thickness — I pay the McMaster premium to keep moving rather than lose a weekend. Nobody sane buys their bulk steel from McMaster, but the catalog photos, exact specs, and CAD models make it the best place to confirm what you even need before ordering it cheaper elsewhere. Budget the shipping into your total cost to start welding so the door price does not surprise you.
Online Metal Suppliers Compared
| Supplier | Best For | Alloy Range | Relative Price | Shipping Speed |
|---|---|---|---|---|
| Online Metals | Cut-to-size specialty | Very wide (incl. titanium) | Mid-high | Standard ground |
| Metals Depot | Small structural lots | Wide mild + structural | Mid | Standard ground |
| Midwest Steel | Cut aluminum value | Steel + aluminum | Low-mid | Standard ground |
| McMaster-Carr | Speed and catalog depth | Enormous | High | Often next-day |
| Speedy Metals | Low shipping cost | Wide | Mid | Standard ground |
Speedy Metals and Metal Supermarkets round out the field — both are solid, with Speedy often posting the lowest freight and Metal Supermarkets bridging online ordering with local-branch pickup. Across all of them, the rule holds: online wins on alloy and precision, loses on bulk price.
Disclosure: HomeWelder is reader-supported. As an Amazon Associate I earn from qualifying purchases made through links in this article, at no extra cost to you. I only point to gear I actually use or would buy for my own shop.
How to Order Steel Online Without Overpaying on Shipping
Shipping is where online metal orders go wrong. Long stock ships by freight or dimensional-weight ground, so a $20 bar can carry $45 of shipping. The fix is to order shorter cut lengths, consolidate everything into one order, and measure twice before you commit to a cut.
My routine: I lay out the whole project cut list first, mark every piece with a soapstone marker on a scrap test piece to confirm dimensions, then order all the cuts in one shipment. Ordering cut-to-length instead of full sticks usually drops you out of freight pricing and into standard ground, which is the single biggest saving. Keep a sharp set of digital calipers on the bench to verify wall thickness when the metal arrives, because online listings occasionally round gauge — and the true thickness drives your MIG voltage and wire-speed settings. And keep a stack of fresh cutoff wheels ready — even cut-to-size pieces often need a clean trim before they fit a fixture.
One more habit: weigh the order against driving. If a local yard 30 minutes away stocks the alloy, the fuel almost always beats the freight. Online earns its keep on what the yard cannot do — odd alloys, exact lengths, and shipping to a rural shop with no supplier nearby.
Frequently Asked Questions
What is the best online metal supplier for home welders?
Online Metals is the best all-rounder for cut-to-size specialty stock and deep stainless and aluminum inventory. Metals Depot wins for small lots of certified structural mild steel, Midwest Steel for cheap cut aluminum, and McMaster-Carr for speed when a project is stalled waiting on one piece.
Is it cheaper to buy steel online or locally?
Locally, almost always. Online metal suppliers charge mid-to-high per-pound rates plus shipping that can rival the metal cost on long stock. Online only wins on price when you factor in fuel for a long drive, or when you need an alloy or exact cut length a local yard does not stock.
Does Online Metals cut to size?
Yes. Online Metals cuts most stock to the inch for a per-cut charge, which is its main advantage. Ordering shorter cut lengths instead of full 20-foot sticks also drops many orders out of expensive freight pricing into standard ground shipping.
Why is McMaster-Carr so expensive for metal?
You pay for catalog depth, exact specs, CAD models, and shipping speed that is often next-day. Nobody buys bulk steel from McMaster-Carr, but it is the fastest way to get one specialty piece when a build is stalled, and the best place to confirm a spec before buying it cheaper elsewhere.
How do I avoid high shipping on online steel orders?
Order cut-to-length pieces instead of full sticks to escape freight pricing, consolidate everything into one shipment, and measure twice before committing to a cut. On long stock, dimensional-weight shipping can add forty dollars or more, so shorter cuts in one order save the most.
Can I buy certified alloy steel online?
Yes. Metals Depot and most online houses sell known grades like A36, 1018, and 1045 with the alloy specified, which is the key advantage over a scrap yard. For load-bearing projects where the alloy matters, certified online steel removes the mystery-metal risk entirely.
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