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The Prime-Line U 9970 deadlock offers a secure lock solution to protect your home with its jimmy-resistant design, which prevents forced entry by spreading door frames. This keyed lock features a surface-mounted, cross-bolt design that ensures robust security while maintaining ease of use. Ideal for residential and commercial doors. Made from premium materials, this diecast lock with a brass-colored finish delivers long-lasting durability and a sleek appearance, enhancing both security and style. Comes with all mounting hardware, including an angled strike, rim cylinder, trim ring, and shutter guard, making it simple to install on wood or metal doors 1-3/8 inch to 2-3/8 inch thick. Requires a 1-1/4 in. hole and uses a Segal keyway. For further dimensional information, please see the line drawing and compare it with your needs before purchasing.
From the Manufacturer
This single cylinder deadlock is constructed of diecast and it comes in a brass colored finish. It features a jimmy-resistant design which prohibits forced entry when attempts are made to spread the door away from the frame. This is a surface-mounted, cross-bolt locking device which can be mounted to 1-3/8 in. to 2-3/8 in. thick, wood or metal doors. This door lock includes an angled strike, a rim cylinder, 2 keys, a cylinder trim ring, fasteners, a mounting plate, instructions and a tamper-resistant shutter guard. This lock requires a 1-1/4 in. hole and uses Segal keyway. it is keyed differently, but it is also available keyed alike via special order from manufacturer. See Prime-Line's model number U 9972 for a double cylinder deadlock, or model number U 9971 for the single cylinder deadlock in a white painted finish. Single cylinder deadlock is also available in satin nickel finish; model number U 10817.
customer
Reviewed in the United States on March 15, 2025
This works but it is very flimsy. It is very light weight, compared with the one that it replaced. The locking mechanisms are not well aligned and don't move smoothly. Sometimes it gets stuck. I hope we don't get locked out at the most inconvenient time and end up paying serious money for a lock smith. Having said this, a more expensive "name brand" lock that I purchased, albeit studier, doesn't work much better than this one. Quality has gone out the window across the board!!!
Angel Rodriguez
Reviewed in the United States on February 14, 2025
It was hard to find the lock to replace a no one works good fit good
Antonio
Reviewed in Brazil on January 5, 2025
Muito bom
Miss
Reviewed in the United States on January 2, 2025
My Dad installed this lock at least 20 years ago. It finally quit working. The cylinder would turn but the locking mechanism would not engage. It was not available locally at the 3 places I checked so I went to Amazon to get it. It is just like the old one and fits exactly. This made it easy for me to install with no problems. The door is 70 years old. If this new lock quits working, I will probably have to replace the door instead of the lock. Glad I found it on Amazon, and really glad the style has not changed since my Dad bought the first one. Recommend it for durability and safety. If you are installing it on a door that has never had a lock like this, it will be more complicated. I am not that skilled. The instruction are very clear and explain how to do it, and templates are included.
jean francois goulet
Reviewed in Canada on September 26, 2024
Porte de bois sécurité
Stillybard aka Mr. Rubber Stamp
Reviewed in the United States on August 12, 2024
Perfect for the price point. It installed quickly and does its job...
Michael
Reviewed in the United States on June 5, 2024
Replaced one just like it that was at least 15 year old. Using it on a very old and lightweight door that‘s too thin to take a deadbolt assembly. This is a reliably built, jimmy-proof surface lock. I don’t believe it’s as stout as a deadbolt. But it does a fine job on a door that anyone could easily blow through regardless of which lock was on the door. Probably better suited for a utility room than the front door of your house.
Marcelo Bortolin
Reviewed in Brazil on November 24, 2024
Muito bem fabricada, manual de instruções de facil conpreendimento, instalação nivel médio, requer serra copo e formão, e a aplicação nos meus Portões ficaram excelentes. Recomendo a Todos.
ISAQUE XAVIER RIBEIRO
Reviewed in Brazil on November 23, 2024
Funcional e de fácil instalação
Still waiting
Reviewed in the United States on November 12, 2024
Easy to install
Timofei
Reviewed in the United States on October 24, 2024
Visually looks weak, but does the job.
Just_Keith
Reviewed in the United States on April 1, 2018
This is a pretty good deadbolt, especially for the price. As I think has been mentioned, the hardware that comes with it is kind of sub-par. That said, I got extra long screws because my door frame didn't have a lot of solid wood right where the plate makes contact to the door frame, so really long screws were necessary to ensure that the plate will stay put even if an intruder gives the door a good kick. I did re-use the screws from my old deadbolt to attach the cast portion.Something that's a bit aggravating to me is that there's apparently no standardization regarding the actual dimensions or screw locations. This would have made replacing the old deadbolt with the new one a lot easier.One other plus is the keys are basically the same as the common Kwikset style, and the ones that come with the deadbolt are nice quality.Something to beware of is the bolts for the tumbler assembly itself may have to be shortened depending on the thickness of the door. They are designed to be able to snap off about 3/8" of the tips, but I had to use a combination of tools along with brute force to snap them off (it wasn't easy to do). I would have used the bolts from my old tumbler assembly, but the thread pitch was completely different (again, an issue of no standardization).
mr
Reviewed in the United Kingdom on October 24, 2017
extra lock for back door, easy to fit for a person who has basic diy skills
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