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When you're hauling heavy loads, having strong and reliable hinges is crucial. The Polar Hardware Dump Door Hinge is crafted from robust, 1/4 inch thick steel. This high-grade material ensures the hinge is remarkably durable, standing up to tough conditions without bending or breaking. It’s built to last, making it perfect for demanding applications like dump trailers and heavy gates, ensuring your projects carry on without interruptions.
Keeping equipment in top condition can be a hassle, but the built-in grease zerk fitting on this hinge makes maintenance incredibly simple. This practical feature allows you to effortlessly grease the hinge pin, ensuring smooth and long-lasting operation. You'll be able to keep your hinges in great shape with ease, reducing friction and wear for a consistently smooth swing.
Installing hinges can sometimes be a complicated task, but not with the Polar Hardware Dump Door Hinge. Its design features a raw, unfinished surface for easy welding, allowing you to customize the fit to any trailer or gate. The weld-on design ensures a secure, robust attachment, giving you confidence that your gates and doors will swing perfectly every time.
A good hinge needs a reliable pin, and the Polar Hardware hinge is equipped with a precision 1/2 inch diameter greasable pin for dependable operation. This ensures minimal play and maximum stability, even under heavy-duty use. For applications like dump doors, where precision and reliability are key, this pin delivers consistently smooth performance.
When it comes to maneuvering and accessibility, the Polar Hardware hinge shines with its ability to open beyond 180 degrees. This flexibility lets you fully open doors and gates to their maximum range, optimizing accessibility for loading and unloading. Whether you’re working with trailers, gates, or other large panels, this hinge offers the versatile movement needed for efficient operation.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Today we're going to be taking a look at a dump door hinge from Polar Hardware. This door hinge is designed for ranch or heavy access doors. It's also known as a barn door hinge. The bracket and leaf are constructed of 1/4 inch thick steel. Very strong, durable, design. It does have a plain, also known as a raw finish, which is going to allow for easier welding when it comes to the installation.
The bracket is the portion that gets welded to the trailer. The leaf, or plate, gets mounted to the door. It does come with a grease fitting. That's a Grease Zerk fitting for longer life as well as smoother operation. What you can do is, you can frequently pump grease in by attaching a grease gun. Pump the grease in.
That's going to lubricate the pin, or that bolt that runs through. It's going to allow for easy operation, and overall it's going to extend the life of the hinge. In this position, so this would be what's considered the mounted position with the door in the closed position. If we measure from the back of the bracket to the end of the plate, in this position, that's going to give us a measurement of about 4 inches. If it's a little bit more squared off like as if it was actually installed, we're looking at a length measurement of right around 4 inches going that direction. That's measuring from the back of the bracket to the end of the plate.
If we stretch it all the way out to where it's as flat as can be, and go edge to edge, that's going to give us a measurement of something a little bit closer to 5 inches long. The plate portion. This is going to have a width measurement of 2 7/8 of an inch. Again, 1/4 inch thick steel. If we measure that flat side right there, that's going to give us a measurement pretty close to an inch and a half, right in that area, as you can see. Maybe 1 9/16 of an inch.
The bolt, that's going to give us a length measurement from end to end of 4 3/4 of an inch. The bracket, that's going to measure 3 5/8 by 1 inch. That's going to do it for today's look at the dump door hinge from Polar Hardware.
Excellent product, a little more expensive than the cheap alternatives on (another site) but worth it in my opinion. Made in USA by polar and looks very heavy duty.
Easy to install and durable
Victoria H.
3/26/2025
It looks pretty good installed too, Shawn! Is this something you're making or a repair?
I can't rate these yet on usage,but based on the construction thereof. I can tell you they are well built and will be using them on 2-- 50 inch wide by 8ft high wooden doors on my cistern tank house that has 2 -2500-gallon tanks. I welded them to 5x6 plate steel but have yet to finish my project due to a lower back problem.
Used for a 30' flag pole hinge, holds up great
Worked perfect for my load trail dump trailer door
Very well build hinges. Much better than the Chinese Amazon ones. The back of the formed barrel was welded and it has bronze bushings instead of plastic.
I used these hinges to attach a spare tire rack to the back of our Toy Hauler. The effort of crawling under a trailer and wrestling a 70 pound spare tire out didn't make sense. So I attached a set of these to a tire carrier for a Chevy Astro Van. Bolted it all together and still have easy access to the back garage door/ramp.
Larry A.
7/15/2019
Absolutely great!
Looks very solid , I haven't used them yet on my project but buy the feel and look of them I don't expect to have any problems with them
Brooke M.
3/7/2025
Wed love to see a picture of the finished project if you feel like sending one in :)
Used this for an off-road trailer, spaced the door and 8th inch and used 1/4 inch weatherstripping, seals perfectly
Quality items worked as intedended as swing gate henges for dump trailer.
Very quick delivery! Good quality, very heavy duty.
Trying now to find door hook that holds the door open when dumping
Making good use of them as hinges for adjusting the inclination on my solar panels. Spreading about 600 lbs out over three hinges.
Wow! This little hinge is amazing! Please buy 50 of them right now! Stock up! The apocalypse is coming and you will need these. The picture is my backhoe and has absolutely nothing to do with this part.
Mike L.
7/1/2019
Nice backhoe! It looks like youre well-equipped for any future apocalypse!
Cam latch and dump gate 270 hinges worked out great. Delivery was on time!
No complaints really. You have to flip the bolt if it is a left side hinging door or gate, but I guess that is more cosmetic than anything since there isn’t a chance that the nut would back itself off. I like bolt head up. Time will tell how good the product is or isn’t.
On Time perfect product
My grandson welded it and it’s working perfectly.
When installing drop down gates on a trailer or deck, these are handy little hinges.
They weld easily, move smoothly, and with the lube zerk fitting, should last pretty well. My installation is on the rear of a tilt down trailer deck, with a "2x4" steel rear gate that drops down to drive over for loading. These hinges look strong enough to hold up to the job.
Carl
9/1/2019
All is good one year later! Tilt deck trailer and flip down back gate that gets driven on by cars and tractor. Hinges have held up well as have my welds!. Very versatile and useful hinges.
GREAT PRODUCT
Placed hinges on a custom dump trailer. They have been wonderful!
These hinges are great. I welded 2 of them onto each side of my custom barn doors on my dump trailer. The doors also fold down for a ramp. I ran my 11,000lb skid steer up the ramps and these hinges did end up bending or flattening out a little. So I cut them off and reinforced them a little with a side gusset plate so they couldn't stretch. I have since added 2 more on each side for added strength. Needless to say, they are built very well, grease zerk too. I would recommend them.
Product shipped in a timely manner and was exactly what we were looking for to make the necessary repairs.
Exactly as described. Worked great. Will order for more projects again soon.
I own a custom shop where we work on furniture and fixtures mostly for restaurants and bars - so I may not be the typical customer looking for trailer parts, but I do have a fair amount of experience in fabrication. These hinges are going into a large sign out front of a high end restaurant holding a steel door and will see a good amount of use.
The pics on the site looked ok, but when the hinges showed up at my shop, I don't know how eTrailer puts out this level of quality at this low of a price.
Hope they don't catch on to how great of deal these are ! Lol.
I'd recommend these to anyone looking for rock solid greaseable hinges.
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Gwendolyn Y.
2/28/2025
Hey Cody. Install looks great!