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Prime-Line MP4180 Door Knob Lock-Out Device, Diecast Construction, Gray Painted Color (Single Pack)

3.9 3.9 out of 5 stars 87 ratings
$31.58 with 18 percent savings
List Price: $38.58

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Purchase options and add-ons

Brand PRIME-LINE
Color Gray
Product Dimensions 6"L x 5"W
Specific Uses For Product Door
Special Feature Easy to Install
Style
Knobs
Handle Type
Knob
Shape
Round
Finish Type
Painted Finish,Painted

About this item

  • DOORKNOB LOCK-OUT DEVICE – The Defender Security doorknob lock-out device can be placed directly over the entry doorknob to block access to the keyhole. Note: Measure your door's handle diameter to ensure it will fit inside the lock-out device.
  • COVERS KEYHOLE – This doorknob security device is designed to keep the keyhole on the locked entry doorknob from being accessed, not the handle from being turned, effectively keeping other keyholders out.
  • REMOVABLE – The durable diecast cylinder is held in place with an O-ring and is removable for cleaning when the device is unlocked and open. The cylinder cannot be removed when the device is closed and locked.
  • DIMENSIONS – This lock-out device can protect rounded doorknobs that have a max diameter of 2-7/16 inch. Note that the shaft cut-out is circular in shape and measures 1-3/16 inch, so it may fit loosely over doorknobs with smaller diameter slender shafts.
  • APPLICATIONS – This lock-out device is often used in evictions, rentals, home sales, on job sites, in-home, in-office storage knobs and more. It is used in situations where you want to prevent other keyholders from accessing the keyhole to unlock
  • NOTE - Look for the keys inside the lock-out device as the may shift around during transportation
› See more product details

Customer ratings by feature

Sturdiness
4.3 4.3
Easy to install
4.2 4.2
Value for money
4.2 4.2
See all reviews

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Prime-Line MP4180 Door Knob Lock-Out Device, Diecast Construction, Gray Painted Color (Single Pack)
$31.58
Get it as soon as Monday, May 20
In Stock
Ships from and sold by Amazon.com.
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Prime-Line EP 4180 Doorknob Lock-Out Device – Doorknob Lock with Key to Block Access to Keyhole, Removeable and Easy to Use,
$19.60
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Prime-Line S 4180 Door Knob Lock-Out Device – Prevents Turning of Door Knob and Access to Keyhole, Can be Used for Home Renta
$20.78
Get it as soon as Monday, May 20
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Ships from and sold by Amazon.com.
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From the brand

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  12. primeline logo about us

    Headquartered in Redlands, California, Prime-Line has been recognized as North American's largest supplier of window and door replacement hardware for more than 40 years. We also offer hard-to-find fasteners, tools and other innovative products, designed to make your house a home.

    Prime-Line is your one-stop-shop, offering thousands of replacement hardware parts... including the one you need.

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From the manufacturer

aplus primeline logo banner 970x300 v2
primeline exterior door hardware

Exterior Door Hardware

Businesses and homeowners alike can take advantage of the exterior door hardware Prime-Line offers for residential and commercial use. We understand that market demands extend beyond traditional doors, so we’ve anticipated your needs, providing a selection ranging from garage door hardware to replacement parts for commercial swinging doors. Explore our selection to locate the repair and replacement hardware you desire.

primeline interior door hardware

Interior Door Hardware

Interior door hardware is an integral part of home maintenance. Prime-Line understands this and supports homeowners with our selection of interior door repair and replacement hardware. From replacing the pivot of a folding closet to installing new rollers for a pocket door, consumers gain the parts they need for their home improvement projects. Find an interior door hardware solution within our array of replacement parts.

primeline windows and screen repair

Window And Screen Repair

Window and window screen repair parts are the answer to consumers' desires for a cost-effective solution to window damage. After inclement weather, improper usage, or damage, many individuals prefer to return their windows or screens to functionality rather than buying replacements. Prime-Line supplies hardware distributors and individuals with repair hardware to meet this need. Access our wide-ranging collection of available window screen repair parts.

primeline door security

Door Security

Door security products, such as deadlocks and cover plates, are an important form of protection for homes and buildings. Business owners, homeowners, and organizations look to reliable hardware to keep their property safe. Our wide selection of replacement parts empowers owners to proactively protect their residential and commercial spaces. Explore the safety and security products Prime-Line offers.

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Prime-Line MP4180 Door Knob Lock-Out Device, Diecast Construction, Gray Painted Color (Single Pack)

Prime-Line MP4180 Door Knob Lock-Out Device, Diecast Construction, Gray Painted Color (Single Pack)

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Product Description

This Defender Security doorknob lock-out device is designed to be mounted directly over the entry doorknob to prevent access to the keyhole only, effectively preventing unauthorized access by key. The durable, diecast cylinder is held in place with a removable O-ring for cleaning the cylinder when the lock-out device is unlocked and open. The cylinder cannot be removed when the device is closed and locked. This lock-out device is often used in evictions, rentals, home sales, on job sites, in-home, on in-office storage room knobs to keep other keyholders out, even if they have a key to the door. It is a quicker and easier solution than replacing the entire knob and lock system on a door while still getting the protection you need. The maximum outside diameter of a round knob that can be secured with this device is 2-7/16 inch.

Customer reviews

3.9 out of 5 stars
3.9 out of 5
87 global ratings

Customers say

Customers like the performance, ease of installation, and quality of the hardware handle. They mention that it works well, is easy to install, and that the key works for both locks.

AI-generated from the text of customer reviews

5 customers mention5 positive0 negative

Customers are satisfied with the performance of the hardware handle. They mention that it works well, gets the job done, and is a great product.

"...Quick, easy, gets the job done!" Read more

"Excellent product!" Read more

"This is a great product! It has worked really well in our home for the purpose we purchased it for...." Read more

"It works great!..." Read more

3 customers mention3 positive0 negative

Customers find the installation of the hardware handle quick and easy. They say it gets the job done.

"...Quick, easy, gets the job done!" Read more

"...This makes it simple. Just don’t pinch your finger…" Read more

"...then this is the lock for you. Easy to install, lock and unlock. Instant peace of mind." Read more

3 customers mention3 positive0 negative

Customers are satisfied with the quality of the hardware handle. They mention that it's easy to install, lock and unlock, and the key works for both locks.

"I ordered 2 but only got keys for one. Luckily the key works for both locks." Read more

"...then this is the lock for you. Easy to install, lock and unlock. Instant peace of mind." Read more

"Great lock......" Read more

Top reviews from the United States

kuulei
5.0 out of 5 stars Winner
Reviewed in the United States on October 22, 2022
Verified Purchase
Exactly what I was looking for and does exactly what it says!

No need to measure door/door frame/door jams. Perfect in a room for rent situation while your away, just don't trust the people you live with lol, or extra security if you're away for a certain amount of time.

Quick, easy, gets the job done!
3 people found this helpful
Helpful
 Report
Marcel Smith
5.0 out of 5 stars It works great!
Reviewed in the United States on August 21, 2023
Verified Purchase
I ordered 2 but only got keys for one. Luckily the key works for both locks.
Helpful
 Report
Cvision
1.0 out of 5 stars These are useless
Reviewed in the United States on October 23, 2022
Verified Purchase
The entire line. Regardless of cost is keyed alone. It would work wonderfully if they didn’t ALL EACH AND EVERY ONE. Have the same key. Buy one and someone can get into every single one. The company was very kind and refunded the cost of all 4 that I bought.
5 people found this helpful
Helpful
 Report
Allison
5.0 out of 5 stars Great product!
Reviewed in the United States on June 29, 2021
Verified Purchase
This is an easy way to ‘secure’ a room. I work from home and need to be able to lock my office as needed. This makes it simple. Just don’t pinch your finger…
Helpful
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Jessica7
5.0 out of 5 stars Works great!
Reviewed in the United States on August 3, 2023
Verified Purchase
Excellent product!
Helpful
 Report
MsChrisR
5.0 out of 5 stars Great lock...
Reviewed in the United States on June 8, 2021
Verified Purchase
This was purchased to keep a nosey family member out of a bedroom when they’re unsupervised.
It’s sad but u do what ya gotta do when ur Mom has a nosey houseguests that won’t leave. My Mom absolutely luv’s this🔒& laughs to herself everything time she puts it on.

** This lock is great for roommates, houseguests & even to prevent maintenance techs from snooping around.
6 people found this helpful
Helpful
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Tx_Arianna333
3.0 out of 5 stars Keys?
Reviewed in the United States on February 21, 2022
Verified Purchase
This is a great product! It has worked really well in our home for the purpose we purchased it for. I would have given 5 stars, if it weren’t for ONE glitch! We ordered 2 locks but only received one key!!! Thankfully that key worked with both locks. However… it’s a bit frustrating to know that we only have one key. AND…. Had we not ordered 2, we might have been REALLY out of luck!
One person found this helpful
Helpful
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An
2.0 out of 5 stars Poor back design
Reviewed in the United States on October 21, 2022
Verified Purchase
Not a good design on the back. Would not work on my know and was a sloppy fit. Was not able to return in time allotted and so I am stuck with something I can't use.
Helpful
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Top reviews from other countries

HR
1.0 out of 5 stars Received damaged
Reviewed in Canada on May 9, 2024
Verified Purchase
Damaged
Customer image
HR
1.0 out of 5 stars Received damaged
Reviewed in Canada on May 9, 2024
Damaged
Images in this review
Customer image
Customer image
Report
M
5.0 out of 5 stars Keeps lightfingered types out
Reviewed in Australia on September 23, 2019
Verified Purchase
Fantastic. It has kept the little rat roommate from coming into my bedroom/en-suite while I’m away and whittling away at my belongings. One of the best buys in a long time.
Report