Grade 70 Transport Chain: Don't Make the Mistake Every Rookie Is Tempted to Make

If there's one piece of equipment I tell every new flatbed driver not to cut corners on, it's chains.

You can replace a tarp. You can replace a strap. You can even replace a binder. But if a chain fails while you're hauling 40,000 or 50,000 pounds of steel, you've got a problem that money can't always fix.

After more than 20 years hauling flatbed all over the country, I've learned that good chains aren't an expense. They're an investment. And they're one investment that's worth every penny.

The rookie trapThe Biggest Mistake I See New Drivers Make

When drivers first get into flatbed, they're trying to buy all their equipment at once. Chains. Binders. Tarps. Edge protectors. Gloves. The list never seems to end.

That's when some people make a mistake. They walk into a farm store or hardware store and buy the cheapest chain they can find because it "looks about right."

Don't do it.

Why the grade mattersGrade 70 Exists for a Reason

When I was hauling steel, Grade 70 transport chain was my everyday workhorse.

There's a reason you see so much gold-colored Grade 70 on flatbeds across the country. It was designed for cargo securement. It's strong. It's dependable. And when it's properly rated for the load, it'll serve you well for years.

The important thing isn't just the color. It's the grade markings stamped into the chain — Grade 70 is marked with a 7, 70, or 700, usually on every few links. That stamp is what tells you what you're really working with. No stamp, no trust.

The everyday chainThe Chain I Ran Every Day: 3/8" Grade 70

For most steel loads, my everyday chain was 3/8" Grade 70. That size has a Working Load Limit of 6,600 pounds per chain, and it's the single most common transport chain you'll see on flatbeds in this country. If you're building your kit and you haul general steel, 3/8" G70 with grab hooks is where you start. I liked mine around 20 feet — long enough to reach and wrap, short enough to handle.

Stepping upWhen You Step Up: 1/2" Grade 70 for the Heavy Stuff

Most steel loads could be handled with my everyday 3/8" chains. But every once in a while I'd haul something that called for heavier securement — a big piece of heavy equipment, or an exceptionally heavy steel coil.

That's when I stepped up to 1/2" Grade 70 chain, which carries an 11,300-pound Working Load Limit, and I ran it with matching 1/2" binders. If you're pulling a D9 dozer or a 60,000-pound coil, your everyday 3/8" chain isn't the tool for that job — you want the heavier chain and the heavier binder to match.

That brings up the rule that decides how many chains you actually need, and it's worth understanding.

The mathKnow the Rule: Combined WLL Has to Cover the Load

Here's the part a lot of rookies never learn until an inspector explains it to them. The law isn't just "throw a few chains on and go." The combined Working Load Limit of all your securement has to add up to at least half the weight of what you're hauling. So a heavier load needs either more chains or bigger chains — that's the real reason I always carried plenty. It wasn't just being careful. It's what keeps you legal.

And for heavy equipment, there's a second rule stacked on top of that one.

Heavy equipmentThe Four-Corner Rule for Heavy Equipment

Any piece of equipment over 10,000 pounds has to be chained at all four corners — a minimum of four tie-downs, one near each independent corner, restraining the machine forward, backward, side to side, and down. Grade 70 chain or better is required for this; straps alone don't cut it for heavy metal machinery.

Take a Bobcat or a small skid steer. A lot of new drivers look at one and think a couple of straps will do. It won't. Most skid steers land right in that over-10,000-pound, four-chain zone — and both the weight rule and the length rule apply, so you use whichever one calls for more chains.

And here's the piece people forget: the bucket or attachment has to be lowered all the way down to the deck and then secured with its own separate tie-down — and every chain goes to the machine's frame, never to the lift arms, the bucket, or an attachment. So a Bobcat isn't four chains. It's four chains at the corners plus one more on the lowered bucket. Miss that, and you've got an inspection violation at best and a loose attachment at worst.

The weakest linkHooks Matter Just as Much

A chain is only as good as what's attached to the end of it.

Over the years, I used both grab hooks and slip hooks depending on the application. Grab hooks are great when you need to shorten a chain and get exactly the length you want — that's what I ran most of the time. Slip hooks have their place too, especially when the securement method calls for them.

The important thing is making sure the hooks are properly rated and match the chain you're using. Never mix mismatched equipment just because it happens to fit — and remember the weakest-link rule: a 6,600-pound chain on a 4,000-pound hook or binder is only a 4,000-pound securement line. The whole line is only as strong as its weakest piece.

Inspect firstInspect Every Chain Before It Goes on the Trailer

I don't throw a chain on a load without looking at it first. It only takes a few seconds. I'm checking for:

• Stretched links
• Bent links
• Gouges
• Deep rust or corrosion
• Cracks
• Twisted chain
• Worn grab hooks
• Worn slip hooks
• Damaged safety latches where applicable

If something doesn't look right, that chain comes out of service. No debate.

Nothing lasts foreverChains Wear Out

Some drivers act like chains last forever. They don't.

They get dragged across concrete. They scrape steel. They get soaked in rain. They get exposed to road salt. They get overloaded. Eventually, they wear out.

I've retired plenty of chains over the years, and I've never regretted replacing one early. I'd rather buy another chain than explain why one failed.

The bottom lineWhat I Would Buy Today

If I were starting over today, I'd spend my money on quality transport-rated chains from a manufacturer with a proven reputation. I'd run 3/8" Grade 70 as my everyday chain and keep a set of 1/2" Grade 70 on the trailer for the heavy loads. I'd make sure every chain was clearly marked with its grade. I'd buy quality binders to match them. And I'd build my collection over time instead of trying to save a few dollars by buying questionable equipment.

Good chains last. Cheap chains become expensive the first time they let you down.