Winch Strap Guide for Flatbed Trailers
Winch Strap Guide
Walk along the side of a flatbed trailer and you will see a row of small steel spools under the deck. Each one has a strap wound around it. Those spools are winches, and the strap made for them is called a winch strap.
This setup is the main way flatbed drivers hold down freight. It is fast, strong, and always on the trailer when you need it. This guide explains how it works, what the sizes and hooks mean, and how to use it safely.
In This Guide
What Is It?
It is a long piece of polyester webbing with a hook on one end and a plain end on the other. There is no ratchet on it.
The plain end feeds into a winch on the trailer. The hook end goes over the load and hooks to the far side of the trailer. Then you turn the winch with a steel bar to pull the strap tight.
So the strap and the winch work as a team. The strap holds the load, and the winch does the tightening.
How Is It Different From a Ratchet Strap?
Both hold cargo with webbing. The difference is how they tighten.
A ratchet strap has its own tightening tool built in. You can use it on any trailer with anchor points.
A winch-style strap has no tightening tool. It needs a winch that is mounted on the trailer.
Ratchet straps are more flexible. You can use them anywhere. Winch-style straps are quicker for daily flatbed work because the winch stays on the trailer and the strap is stored right on it.
Many flatbed drivers use both. They use winches for most of the load and carry ratchet straps for odd spots or extra tie downs. You can see both kinds in the Safe & Tie straps collection.
Types of Trailer Winches
Sliding Winches
These ride in a track under the edge of the trailer. You can slide them forward or back to line up with your load, then lock them in place. They give you the most freedom. Safe & Tie lists these in the sliding winch collection.
Weld-On Winches
These are welded to the trailer frame. They are very solid but cannot be moved.
Bolt-On Winches
Bolt-on winches bolt to the side rail. They are a good choice when welding is not possible.
Portable Winches
These hook onto the rub rail or fit in a stake pocket. They are handy for trailers that have no track.
Most trailers have winches on the driver's side. That way the driver works on the side away from traffic.
Sizes
Webbing comes in three common widths.
| Width | Use | Typical Working Load Limit |
|---|---|---|
| 2 inch | For lighter loads | Around 3,333 pounds |
| 3 inch | A middle size | Often around 5,000 pounds or more |
| 4 inch | The flatbed standard | 5,400 pounds |
The most common lengths are 27 feet and 30 feet. That is long enough to go over a tall load on a standard flatbed and still reach the winch.
Always read the tag on your own strap. The rating on the tag is the one that counts.
Hook Types
The hook is what connects the strap to the trailer on the far side.
Flat hook. A wide, flat steel hook that grabs the rub rail or the side of the trailer. This is the most common type for flatbeds.
Wire hook. A hook made of bent steel rod, often a double J shape. It fits D-rings and narrow anchor points.
Chain end. A short piece of chain with a grab hook. It is tough and fits stake pockets and other spots where a flat hook will not sit.
Delta ring. A triangle-shaped ring that lets you connect to hooks or chains.
For most flatbed work, the flat hook is the one to have.
How to Use One
- Line up the winch. Slide the winch so it lines up with the spot where the strap needs to cross the load.
- Feed the plain end. Push the plain end of the strap through the slot in the winch spool. Pull a foot or so through.
- Throw the strap. Toss the hook end over the load to the other side. Keep the strap flat.
- Hook the far side. Walk around and set the hook on the rub rail or anchor point. Make sure the hook is fully seated.
- Set your edge protectors. Put a guard on each corner where the strap bends over the load.
- Take up the slack. Turn the winch by hand to wind up the loose strap.
- Tighten with the bar. Put the winch bar into a hole in the winch cap. Pull down in smooth strokes until the strap is firm. The catch on the winch, called the pawl, clicks into the gear teeth and holds it.
- Check the lock. Make sure the pawl is seated in the gear before you take the bar out.
How to Use a Winch Bar Safely
The winch bar is a simple tool, but it can hurt you if it slips.
- Seat the bar all the way. The tip must be fully in the hole before you pull.
- Pull down, do not push up. Use your body weight in a steady pull.
- Stand to the side. Keep your face and body out of the path of the bar.
- Keep a firm grip. If the pawl slips, the bar can whip back up.
- Do not use a pipe for more force. Too much force can damage the strap, the winch, or the freight.
- Watch your footing. Mud, ice, and gravel make slips more likely.
- Wear gloves.
A combination bar is useful because one end fits winches and the other end works lever binders. Safe & Tie carries a 40-inch combination winch bar in a two-pack.
How to Release It
- Put the bar in the winch cap and pull down just a little to take the pressure off the pawl.
- Lift the pawl out of the gear with your free hand.
- Let the bar up slowly to let the tension off. Keep hold of the bar the whole time.
- Unhook the far side and pull the strap back.
Never just knock the pawl loose on a tight strap. The winch can spin fast and the bar can fly.
Care Tips
- Roll loose straps back onto the winch after each load. A winch winder makes this fast.
- Tuck the hooks so they do not bounce on the road.
- Rinse off mud and road salt.
- Check for cuts, burns, and frayed edges before each use.
- Use edge protectors on every sharp corner. You can find them in the edge protectors collection.
- Oil the winch gear and pawl now and then so they do not rust.
- Replace any strap with a missing tag.
Final Thoughts
A winch strap is the everyday workhorse of flatbed hauling. It has no ratchet, so it relies on a trailer winch and a winch bar to pull it tight. Choose the right width and hook for your trailer, tighten with smooth pulls, and release with care. Look after your straps and winches and they will hold load after load.
Gear Up Your Flatbed
Shop 4" x 30' winch straps, sliding winches, and winch bars at Safe & Tie.
Shop Winch StrapsFrequently Asked Questions
Can I use it without a winch?
No. It has no tightening tool of its own. You need a trailer winch, or you need to use a ratchet strap for that spot.
What size is most common on flatbeds?
Four inches wide and 27 or 30 feet long, with a flat hook, is the most common setup.
Which side of the trailer do the winches go on?
Most are on the driver's side so the driver can work away from passing traffic. Some trailers have them on both sides.
How tight should I make it?
Tight enough that the load cannot shift when you push on it. Do not crank so hard that you crush or bend the cargo.
How often should I replace my straps?
Replace a strap when you see cuts, burns, broken stitching, or a missing tag. Check them every time you load.