3" Wide Continuous Stainless Steel Hinge, 6' Long

3" Wide Continuous Stainless Steel Hinge, 6' Long

Item # SH300

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Polar Hardware 3 Inch Wide Enclosed Trailer Parts - SH300
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  • Doors
  • Door Hardware
  • Hinge
  • Continuous Hinge
  • Polar Hardware
  • 72 Inch Long
  • 3 Inch Wide
Call 800-298-8924 to order Polar Hardware enclosed trailer parts part number SH300 or order online at etrailer.com. Free expert support on all Polar Hardware products. Guaranteed Lowest Price and Fastest Shipping for 3" Wide Continuous Stainless Steel Hinge, 6' Long. Enclosed Trailer Parts reviews from real customers.

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  • Reviews (20)
  • Q & A (17)
  • Videos (1)
  • Photos
  • Why etrailer?

Polar Hardware Enclosed Trailer Parts - SH300

Also called a piano hinge. All continuous hinges rotate 270 degrees, measure 6' in length and come with no holes, making it easy to either weld or drill to specification.


  • Stainless steel construction
  • Rotates 270 degrees
  • No pre-drilled holes - easy to weld or drill to match application


  • Flat width: 3"
  • Pin size: 1/4"
  • Gauge: 0.074"
  • Knuckle length: 1"

0851 3" Wide Continuous Stainless Steel Hinge, 6' Long

Video of 3" Wide Continuous Stainless Steel Hinge, 6' Long

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Polar Hardware Enclosed Trailer Parts - Doors - SH300 Review

Today we're going to be taking a look at the 3-inch wide continuous stainless steel hinge. It's going to measure 6 feet long. This is also called or known as a piano hinge. Stainless steel construction. It's very strong and durable, does a great job at resisting rust and corrosion. It's going to rotate 270 degrees, really nice design of the unit.

That's going to be as far back as it will go. You'll notice that on this piece there's no pre-drilled holes. That can be a benefit because it makes it very easy for welding applications, and you can also drill holes that you need for your particular application, to fit it best as possible, so that's why there's no pre-drilled holes on the unit. If we take a measurement of the flat width, right now it's in the flat position, edge to edge, that's going to give us a width measurement of right on 3 inches. Overall length, edge to edge, right at 72 inches, which is 6 feet long. The unit can be cut to length.

There's a pin that runs all the way through where these knuckles overlap. That pin diameter is a quarter of an inch. The gauge of steel that it's constructed out of is 0.074 inches. Then the knuckle length, each one of these individual pieces right here. You're going to have your leafs right here.

The leafs have a tab on it that wrap around that pin, and that portion that wraps around is the knuckle. This particular hinge is going to feature a knuckle length. Each one of these is going to measure 1 inch long. Piano hinges can be found on a variety of different applications. You'll find them sometimes in toolboxes. You'll find them for different types of flaps, and you'll also find them on trailers, usually for the ramp door of a trailer, but again, they can be used for a variety of different applications.

This one is going to rotate 270 degrees. One of the things that makes this one a little bit different than some of the other ones we carry is that it's a stainless steel construction, strong and durable design, but stainless steel is also highly resistant to rust and corrosion. That's going to do it for today's look at the 3-inch wide continuous stainless steel hinge.

Customer Reviews

3" Wide Continuous Stainless Steel Hinge, 6' Long - SH300

Average Customer Rating:  4.7 out of 5 stars   (20 Customer Reviews)

- SH300


Hinge is good but description is slightly wrong- nuckle length is actually 1" rather than 1/2' 176109

- SH300


Part arrived on time and was just as promised. For my money, I won’t shop for trailer parts anywhere else. Thank you Etrailer.com 560298

- SH300


Fast shipping and very good quality! I am using for a 16' x 8' foot concession trailer, using on 3' W x 6' H door. The hinge is much better quality than the one I have on there now. 548406

- SH300


Contacted me and notified item would late. Delivered part as soon as it was back in stock. Great service! 589722

- SH300


Worked as described. Have no problems with hinge. Put on lounge deck on boat and no rust. Excellent product. 525639

- SH300


Received the 6 ft piano hinge and looked like great quality stainless and will install shortly. 420783

- SH300


Very happy with your help in delivering the hinge. Bad news that it arrived with 6 inches bent. Fortunately I needed only 66 inches of the total length. 378525

- SH300


I ordered a 6' stainless steel continuous hinge. Ordering was easy, almost half the price of the local source and the product arrived promptly. I use these hinges for my gates since they don't rust and the gate never sags. 324743

- SH300


The hinge worked great. 270134

- SH300


This hinge arrived in perfect shape and was every bit the hinge I hoped it would be. I was afraid it may be to light or inferior but I was pleasantly surprised. I am using the hinge for a short extension to the end of the ramp on a cargo trailer. Thank you for supplying a good product at a good price. 243914

- SH300


You guys are awesome!!!!!!! ive ordered from you several times. Every time it's fast shipping and great products. Keep doing what your doing!!!!! Thanks Jason 242469

- SH300


Excellent hinge, heavy duty. Used for a flap on my motorcycle trailer ramp. Received fast and packaged well. Thank you E Trailer for all your great products. 224427

- SH300


Product arrived as described and ahead of time. 219995


Hinge was as described and delivered has stood up to a solid year of loading and unloading atv and snowmobiles.

THOMAS F - 08/17/2016


- SH300


The price was good on this product when I was looking for the hinge stock. shipping was fast , my first hinge was bent in shipping, etrailer was good about standing behind it and sent out a new one to replace the bad one. Good people in the office ( Kimberly ) that will make it right when you have a problem. will keep them in mind for future jobs. 217289

- SH300


Good fit and fast shipping thanks 199585

- SH300


I needed a SS hinge but was skeptical ordering off the internet. However etrailer.com has good reviews. I ended up calling them on the phone and the young lady helped me place my order. It arrived onetime, and was exactly what I expected. 186518

- SH300


Made for the marine industry. Good people at etrailer. Capt Bob Smith/Oldtimer Charters 127152

- SH300


Hinge was as described and delivered when stated. Thanks, Scott 37760

- SH300


Good product. Excellent service! 19288

- SH300




Ask the Experts about this Polar Hardware Enclosed Trailer Parts
Do you have a question about this Enclosed Trailer Part?

  • Which Piano Hinge will Work the Best on a Trailers Ramp Extension
  • Determining between piano hinges, # H300 3 Inch Wide Steel 6 Ft Long or # SH200 2 Inch Wide Stainless Steel Hinge 6 Ft Long, depends what features you find more important for your application. The # H300 hinge will be stronger in that it is an inch wider than the # SH200. Plus, the extra width will allow for more surface area on the hinge to mount to the trailer making for a stronger hinge. However, if weather conditions are a concern, the # SH200 is made of stainless steel. The stainless...
    view full answer...

  • Is a Piano Style Hinge Good for Making a Flap in a Trailer Ramp Door
  • Steel hinge # SH300 should work well for a flap on your trailer. You can't get a custom length but if you need 67 inches then # SH300 would be the one to get. You can trim it to the length needed. Between you and me, go with # H300. It is exactly the same only it is mild steel. The other one, # SH300, is stainless steel. That is why there is a big price difference.
    view full answer...

  • Converting Swing Open Trailer Door to a Ramp Door to Load a Motorcycle
  • Trailer ramp spring # ERS80S66 could work provided that the interior of the trailer is wide enough for the rod (the rod can be trimmed down some). The capacity of this spring is 80 pounds so it will help when raising and lowering the door but if the door weighs over 80 pounds the rest of the weight would be lifted by you. You really would not need additional parts other than fasteners to mount it in the trailer. I do recommend professional installation by a garage door company because...
    view full answer...

  • Ramp Hinge Recommendation for a Replacement Hinge for an Enclosed Trailer
  • A piano hinge like the part # SH300 could work very well for a replacement hinge for your enclosed trailer. This hinge is 6 feet long and 3 inches wide. A co-worker here used 3 of the Greasable Hinge Pin, # HP12412G, for a similar application and that is what he recommends using over the piano hinge.
    view full answer...

  • Availability of Door Hinge for RC Manufacturing Underbody Toolbox # UB1818-48
  • Yes, I do carry a door hinge for your RC Manufacturing Underbody Toolbox, part # UB1818-48. This toolbox uses a stainless steel piano hinge as the door hinge. To get the correct size hinge, I would recommend to measure the width and length of the hinge you have now. To find out the size you will need, fully open the door of the toolbox and measure the width of the hinge. If the toolbox has a width of 2 inches, you will use the Redline 2 Inch Wide Stainless Steel Hinge, part # SH200....
    view full answer...

  • Converting Barn Doors on an Enclosed Trailer to a Ramp
  • We don't have the ramp itself but we have some parts that may work for you. We have hinges, like # SH300, for the ramp. I've linked our complete selection for you. We also have latches that I've linked as well.
    view full answer...

  • Can Stainless Steel Hinge, # SH300 be Used as the Hinge on an Enclosed Trailer Ramp and Door
  • While it is possible that the Stainless Steel Hinge, # SH300, will work for your application, I believe that there are better and more reliable options. A co-worker here used 3 of the Greasable Hinge Pin, # HP12412G, for a similar application and that is what he recommends using over the piano hinge.
    view full answer...

  • Recommended Ramp Hardware to Add Ramp to 2002 Sundowner Gooseneck Horse Trailer
  • We do not have the Ramp you need, but we do have the hardware you would need to add a ramp to your 2002 Sundowner Gooseneck Horse Trailer. You will want a ramp door hinge like the Polar # PLR1902. You will weld the outside cylinders of the hinge to the trailer and the center section will be welded to the ramp you are adding. Another option is to use the 3" Wide Continuous Stainless Steel Hinge, 6' Long # SH300. To hold the ramp in place for travel, I recommend the 36" Lock Side-Door...
    view full answer...

  • Can the 6-Foot Long Stainless Steel Piano Hinges be Cut In Half
  • All of the hinges we sell like # SH150 are 6 feet long. You can certainly trim a 6-foot length as needed provided you use the proper saw with a blade designed to cut metal. Hinge # SH150 is stainless steel, 6 feet long, and 1-1/2 inches wide. Hinge # SH200 is stainless steel, 6 feet long, and 2 inches wide. Hinge # SH300 is stainless steel, 6 feet long, and 3 inches wide.
    view full answer...

  • Vent Cover Recommendation for a Trailer with an Older Elixir Vent
  • Most likely you either need the part # 63116 that you referenced or the part # CAM40161. Both use the same continuous metal lip for a hinge but the difference is that the # 63116 that you referenced has two square protrusions on the top of the lid. See pic. Your best option will be to compare the product pictures of either of the covers I referenced and go with the one that matches yours. Sounds like you could be looking for a piano style hinge like the part # SH300 that is one piece...
    view full answer...

  • Piano Hinge Recommendation for a Aluminum Ramp so that It can Fold
  • A piano hinge like the part # SH300 would work great for you to allow you to fold your aluminum ramp in half. This hinge is stainless steel too so it won't rust. You might put some thin rubber between the hinge and the ramp to prevent galvanic corrosion. This hinge is 3 inches wide and 6 feet long.
    view full answer...

  • Availability of Pre-Drilled Continuous Hinge That Measures 3-Inches Wide x 68-Inches Long
  • The Redline replacement hinge you referenced, part # H300, measures 3- x 72-inches but is not pre-drilled. This is because this part is designed for multiple installation methods - by welding or by use of fasteners you supply. We also offer a stainless steel version, part # SH300. These hinges do not carry a specific weight capacity since that will depend on the strength of the surface they mount on. For a 150-lb door I recommend the stainless steel hinge # SH300. This hinge can be cut...
    view full answer...

  • Difference Between Piano Hinge H300 and SH300
  • The difference between the Piano Hinge # SH300 and # H300 is the material the hinges are made of. The # SH300 is made of stainless steel which will provide excellent corrosion resistance whereas the # H300 is made from mild steel which won't resist corrosion nearly as well.
    view full answer...

  • Replacement Piano Hinge Recommendation for Rear Deck Lounge Seat on Boat
  • Yes, the 3" Wide Continuous Stainless Steel Hinge # SH300 would be a great option that you would just have to cut down to 30 inches as this is 60 inches. Since it's stainless steel it won't corrode either.
    view full answer...

  • Thickness and Will Hinge Kit SH300 Rust
  • I wish we had a hinge kit that had hole drilled in it already but none of the ones we offer do and we do not have any screw kits designed specifically for them either.
    view full answer...

  • Recommended 6 Foot Long Continuous Door Hinge for a Trailer
  • The best option we have for you is the Continuous Stainless Steel Hinge part # SH300. This hinge is 6' long, 3" wide, and has 1" long knuckles. The overall length of the hinge will be an exact fit but the width will be about 1/4" longer on each side in comparison to the one you have now. However, if this new hinge will not fit due to it being 3" long or 1-1/2" long on each side then you can always cut the excess width to make it work for you. The knuckle length should not really have any...
    view full answer...

  • Stainless Steel Alloy of the Continuous Hinge part # SH300
  • The stainless steel allow of the Hinge part # SH300 that you referenced is 304.
    view full answer...

Do you have a question about this Enclosed Trailer Part?

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Info for this part was:

Expert Research:
Michael H
Expert Research:
Jameson C
Installed by:
Cole B
Updated by:
Sarah W
Updated by:
Amanda M

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