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🔐 Lock in safety and style — because your home deserves the best.
The Prime-Line U 9847 Patio Sliding Door Loop Lock is a heavy-duty, chrome-plated security accessory designed to reinforce sliding patio doors. Featuring a 2-1/8 inch hardened steel locking bar and diecast mounting bracket, it offers enhanced protection against unauthorized entry and includes a child-safe installation option. Easy to install with included hardware, this lock combines durability, corrosion resistance, and practical safety for families and homeowners seeking an affordable security upgrade.




























| ASIN | B004AHVA5S |
| Additional Features | Weather Resistant |
| Best Sellers Rank | #22,943 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #26 in Door Lock Replacement Parts |
| Brand | PRIME-LINE |
| Brand Name | PRIME-LINE |
| Color | Chrome |
| Control Method | Touch |
| Controller Type | Hand Control |
| Customer Reviews | 4.6 out of 5 stars 8,670 Reviews |
| Finish Types | Satin Nickel |
| Global Trade Identification Number | 00049793098474 |
| Included Components | lock, keeper and fasteners |
| Item Dimensions | 0.63 x 3.13 x 4.56 inches |
| Item Type Name | Loop lock |
| Item Weight | 136 g |
| Item dimensions L x W x H | 0.63 x 3.13 x 4.56 inches |
| Lock Type | Loop lock |
| Manufacturer | Prime-Line Products (Home Improvement) |
| Manufacturer Part Number | U 9847 |
| Manufacturer Warranty Description | Goods are warranted against manufacturing defects for 1 year. |
| Material | Alloy Steel |
| Material Type | Alloy Steel |
| Model Name | Sliding Door Loop Lock |
| Model Number | U 9847 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Number of Pieces | 1 |
| Recommended Uses For Product | Door |
| Shape | Rectangular Prism |
| Special Feature | Weather Resistant |
| Style Name | Sliding Door |
| UPC | 049793098474 |
| Unit Count | 1 Count |
D**3
Great for ANY door!!
I’m using this on my storm door as extra reinforcement so my special needs teenager can’t wear down the handle lock or push the door open and run out (like he did on my mother’s door, and so outsiders can’t rip the door open and get in. This is very strong, easy to install and easy to use. I’m 50, female, and it took me less than 10 minutes to get my drill and install this lock. I marked the holes on the frame with a pen, pre-drilled the holes with a drill bit and then drilled the screws in. It’s very secure in both the frame and the door, and I’m very happy with this product! I was not compensated in any way for my review.
C**W
Makes us feel safer with our pool
We have a backyard pool and have ugly alarms on the doors that we had to install when we had our pool built years ago. We stayed at a Ritz Carlton a few years ago and they had locks similar to these on the slider doors. We really like these. They looked a LOT better than the ugly alarm and we have ours installed at the top of the door so the little kids can't reach them. I am removing the ugly alarms. We just bought another one of these recently for another door. Easy to install too!!!
L**E
GREAT quality, great product
PROS: -got here fast -very high quality -works on in-swing AND OUT-SWING doors CONS: -install is a little tricky if you want the latch to drop in smoothly -screw that come with it are not what you need to properly secure this to the door and frame EXPLANATIONS: I would definitely buy these again. My landlord refused to install deadbolts so I installed these because my front door is in-swing and my back door is out-swing. I wanted something to match but that would also be study like a deadbolt. The key is getting better screws. The screws that came with the prouct are size 6 (diameter) and are one inch long. I was looking for home security, so I got the longest screws I could find based on the width of the frame and the door. In the video, I am putting my whole body wight into opening the door (25F, 210 lbs) and NOTHING. I feel so safe in my house now :) Side note: youre supposed to use size 6 screws but you can use size 8, its just more finicky because they BARELY fit.
P**P
Still Decent
Not like how they use to make them in terms of metal thickness but still gets the job done!
K**A
Great lock for sliding doors
I have three (3) sliding doors in my house. They are all 26 years old now and two of the mechanical locks no longer hold. For years I had been putting a wooden block or PVC pipe between the slider and the frame. Finally got tired of bending down every night and morning to put the block in or take it out. Bought one of these stainless locks for the upstairs door. It worked so much better I got another one a few weeks later for the downstairs door. All hardware is included and a snap to install at any height you want.
S**K
Worked great on a wood door!
We used this on an older wood door off the back of our garage. (That door wouldn't latch with the door handle due to structural settling.) Mounting it directly into the door frame and the door worked great! It is a sturdy, strong metal lock. This lock keeps the door closed and locked.
J**.
Great, easy to use safety lock
Nice easy to use safety lock. I used them on my enclosed trailer cabinets to keep them from popping open when in transit. They fit different applications, A+++
I**H
Very nice and easy to install but not that sturdy
I loved the original product but this one is different and earns a two star demerit. P.S: I'm amending my review based on two more of these that I purchased in 12-2024. They changed the design and now the entire sliding bolt does not go into both the metal rings. In other words, they shortened the bolt to the point that it only goes through the first metal ring and not the second. Not even sure why there is a second ring because the bolt does not reach it. Utterly stupid design, probably designed to save money and makes the entire lock even less secure.
K**A
Loved the producr
Loved the product. Suitable for my unique reqirement
G**Z
Well Designed For - Its Job
Well designed for -The Job.
G**L
Muy buena cerradura
Muy buena cerradura de material muy solido
D**X
Seguro para puerta sencillo y funcional
Este seguro si lo hubiese conocido antes me hubiera ahorrado muchos corajes. Hubiese servido para proteger mi casa, debido a que hubiera servido para asegurar una puerta corrediza que da al patio, por donde se metieron a robar a mi casa, pienso yo que con este artículo no hubiera podido o hubiera batallado en abrir la puerta, pero en fin... Un seguro sencillo y funcional el cual recomiendo mucho, porque por obvias razones no se alcanza a ver por el vidrio si se sabe colocar en un lugar que no sea tan fácil encontrar, no es tan pequeño. El material con el que esta elaborado se ve resistente. Instalarlo es muy fácil, es solo cuestión de que se coloque todo el seguro y se puntee por donde se va a taladrar o insertar los tornillos. Cabe mencionar que la seguridad y tranquilidad no tienen precio. En resumen: seguro sencillo y funcional.
T**R
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Trustpilot
4 days ago
1 week ago