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Internet # 321728394

Model # 270D

Store SKU # 1008202589

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Adjustable Hinged and Sliding Door Security Bar (Extends 25.5 to 43.5 in.)

$32.77
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  • Door security stopper resists forced entry into most doors
  • Innovative folding design for storage and perfect for travel
  • Door jammer is twice as strong as our standard door bar
  • View More Details

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Product Details

About This Product

The Master Lock 270D: Adjustable Hinged and Sliding Door Security Bar makes it easier than ever to feel safe in any location. With twice the strength of our standard door bar, this compact door jammer is adjustable and protects hinged, sliding, patio and hotel doors. A security bar for sliding glass doors is an excellent way to bolster security on any property, as well as first-floor apartments. Also perfect for traveling and fitting in your luggage or storing at home, this door stopper/security bar has a padded rubber foot to hold against pressure and prevent damage to floors. The quick-release design makes it easy and fast to install and adjusts to the required length of each door, from 25-1/2 in. to 43-1/2 in. The Limited Lifetime Warranty provides peace of mind from a brand you can trust.

Highlights

  • Door security bar resists forced entry (fits most standard doors: patio, sliding, interior, front, garage access)
  • Door jammer is twice as strong as our standard door bar, with 20-guage steel construction
  • Master Lock 270D is 2x stronger than the 265D based on angled compression testing at standard 36 in. doorknob height
  • Security bar for sliding glass door that can also secure hinged, patio and other doors
  • Door stopper adjusts from 25-1/2 in. to 43-1/2 in. for use on most hinged and sliding doors
  • Rugged, easy-to-install protection for small apartments, dorm rooms and other tight spaces
  • Padded foot provides sure grip on most floor surfaces and protects against damage
  • Innovative folding design for compact storage and portability-perfect for travel
  • Return Policy

Product Information

Internet # 321728394

Model # 270D

Store SKU # 1008202589

Specifications

Required Door Thickness (in.): 1-3/8 in to 1-3/4 in

Dimensions

Required Door Thickness (in.)

1-3/8 in to 1-3/4 in

Details

Commercial/Residential

Commercial, Residential

Returnable

90-Day

Safety & Security Product Type

Lock & Door Reinforcer

Warranty / Certifications

Manufacturer Warranty

Limited Lifetime Warranty

Questions & Answers

Can it withstand the hurricane wind pressure on a standard inward opening exterior fiberglass door?
ByAug 5, 2026
1 Answer | 
Answer This Question

The Master Lock Model 270D Door Security Bar is designed as a supplemental security device to help resist forced entry, not as a hurricane-rated door reinforcement system. Master Lock states that the 270D is made from 20-gauge steel and is tested to be up to 2x stronger than the previous 265D model in compression testing, but it does not carry a hurricane wind-pressure or impact rating.

By|Aug 5, 2026


    when this lock bar is on an inside front door can someone on the outside of the front door PULL instead of pushing to get the lock undone?
    ByMay 4, 2026
    1 Answer | 
    Answer This Question

    The door bar is designed to work with doors that open inwards with a doorknob, and patio doors that slide left to right. For more information regarding this product, or any others from Master Lock, please contact our Customer Support at 800-464-2088 US, 1-800-227-9599 CAN

    By|Jul 28, 2026

      (1)

      Would a three year old be able to open a door from the inside with this against it? They can unlock the deadbolt. So I'm looking for two cheap/easy solutions in one.
      ByFeb 16, 2026
      1 Answer | 
      Answer This Question

      The Master Lock Folding Door Security Bar is not designed as the primary locking device on your exterior door. It is intended as additional security used in conjunction with your current door hardware. The bar is designed to work on many different surfaces, including tiles, wood, linoleum, and carpets. What usually provides best performance is to position the bar with one end under the doorknob, then tightly adjust the foot at approximately 18in from the base of the door.

      By|Apr 2, 2026

        (1)

        Looks like the weakest point of this construction is the hinge in the middle. What locks it straight? What keeps it fm buckling at the hinge? What is the strength of the hinge? Can you rotate the top handle & bottom rubber square to increase the physics
        BySep 9, 2024
        0 Answer | 
        Answer This Question

        Will this work on ceramic tile floors?
        ByJul 21, 2024
        2 Answers | 
        Answer This Question

        Works on my tile floors. Get it the correct height and make sure the foot is all the way down on the floor. I also give it a little push with my foot to make sure it's tight. I have 2 of them. Buying two more for my daughter.

        By|Nov 4, 2025

          The bar is designed to work on many different surfaces, including tiles, woods, linoleums, and carpets. What usually provides best performance is to position the bar with one end under the doorknob, then tightly adjusting the foot at approximately 18in from the base of the door.

          By|Nov 4, 2025

            (1)

            How much force does the bar with - stand?
            ByMay 27, 2024
            1 Answer | 
            Answer This Question

            The bar is tested to withstand different levels of force, dependent on usage (both angled under a doorknob and flat with a sliding door). Follow up questions regarding this product can be handled directly through our customer service department at 800-464-2088 US, 1-800-227-9599 CAN

            By|May 30, 2024


              Can this work on swing in doors?
              ByApr 11, 2024
              1 Answer | 
              Answer This Question

              The bar is designed to work on many different surfaces, including tiles, woods, linoleums, and carpets. What usually provides best performance is to position the bar with one end under the doorknob, then tightly adjusting the foot at approximately 18in from the base of the door.

              By|Apr 11, 2024


                Why these locks dont have anything to keep it from sliding down. Mine are broken and they still getting in my house.
                ByJan 4, 2024
                1 Answer | 
                Answer This Question

                Master Lock does stand behind its product and if you could please contact our Customer Support at 800-464-2088 US, 1-800-227-9599 CAN we can provide assistance.

                By|Jan 5, 2024


                  Viewing 1-8 of 15

                  Customer Reviews

                  4.3 out of 5

                  • 4.3 out of 433 reviews
                  • 76% recommend this product
                  Filter by:
                  Showing 1-10 of 433 reviews
                  Brought for my daughter home . I very familiar own several for my home and keep one for traveling when at hotels
                  by
                  • Verified Purchase
                  Good bar to help deter intruders
                  The master lock fold door bar is great for deterring an intruder. It will give you extra time to take other actions. The loop top helps keep the bar on the door handle so that an intruder can't make it fall off. The red button allows the bar to fold which would be great for traveling, like a hotel room. The bar has two sets of adjusting holes on the top and bottom. I measure the holes to line up the bar at 30 degrees from the door vertical. It is always good to have an extra level of safety. Search for DrB DIY master lock security bar for a quick video demonstration.
                  by
                  • Recommended
                  5 found this review helpful
                  Easy Versatile Heavy Duty
                  Well designed and easy to use- better than expected. Heavier too. Works well for sliders or doors. Stays in place when set on door- secure footing & door knob band. Selected mainly to secure doors on DIY tasks when extension cord prevents closing. Performs excellent. Also for added security of locked garage doors. Strong bar heavier than expected which requires secure grip when lifting from slider door track. Easy adjust, set up and use with included instructions which can be easily missed as they’re folded over and adhered on minimal packaging. Overall a great simple manner of securing doors. Satisfied and recommend Master Lock Folding Door Security Bar- rugged, durable and easy to use.
                  by
                  • Recommended
                  2 found this review helpful
                  Adaptable Door Security
                  Master Lock Brand, Folding, Door Security Bar is a smart way to take extra security on the road or achieve extra security at home. It easily adjusts to fit the door being secured and collapses to compact size, 18-inches in length for storage or travel. Its tubular steel construction makes for exceptional strength while being light weight. While I selected the door security bar for our sliding door, I failed to realize it was only designed for 39-inches of extension. And my 4-foot sliding door requires 46-inches of extension. However, I found the security bar works well by leaving the folding door adapters in place. My door will move a small amount before contacting the bar. However, there is not enough movement to allow a gap between the door and its frame, let alone being able to lift the door out of the track. The bar is quite solid. does not flex, and stays in place even when attempting to bounce it from the track by banging the door into the bar.
                  by
                  • Recommended
                  4 found this review helpful
                  Safe and secure!
                  In an effort to “be prepared,” we are always on the lookout for well-crafted products to make our home more secure. At night, it is comforting to know that our front door is protected by this sturdy MASTER LOCK door-guard device. Constructed of strong metal, it can be folded for use when traveling, can be adjusted to various lengths, and can be used on main-entry doors or in sliding-glass patio doors.
                  by
                  • Recommended
                  4 found this review helpful
                  Master Lock Folding Door Security Bar
                  This is an idea whose time has come... the Master Lock Folding Door Security Bar. Many the time I spent a night in a motel in a distant town with late night revelers stomping up and down the hallway and the thought of all that was between us and them was a deadbolt with a short bolt and a flimsy chain. Well, not anymore... enter this folding Security Bar. It folds down to about 15" inches long and about 3 1/2" wide by about 1 1/2" thick, easily fitting inside of a suitcase or travel backpack. Through the use of two pins it can be extended to fit most doors and so far for me it has worked on both door knobs and door levers. By removing two other pins the door knob/lever adapter and foot can be removed and it will work with sliding patio type doors as well. It is plainly marked "this side towards door". When using it for a regular door there is one caveat... push in on the foot to take up the slack, do not push in higher up or it can come unlatched at the joint where it folds. Other than that, it works great, I tried it on my front door and with the door unlatched and could not force the door. It is a good extra bit of peace of mind. PS they do make a non-folding model as well, just doesn't fit in the luggage as well, protrudes.
                  by
                  • Recommended
                  1 found this review helpful
                  Backup door security at it's best!
                  Looking for extra security for your interior doors or a sliding doors? The Master Lock folding security bar maybe what you are looking for. This substantial bar is well built and has the flexibility to adjust to many different openings. Yes it is more expensive than a piece of wood. However the design to secure a standard door utilizing the door knob isn't a option with a block of wood. The flexibility of its folding for travel provides security at unfamiliar locations.
                  by
                  • Recommended
                  4 found this review helpful
                  Cheap peace of mind
                  This Master Lock folding security bar is a must for homeowners, renters, vacationers etc. It's adjustable to a variety of door knob heights or sliding door widths, foldable so you can toss it in a suitcase and add a touch of extra security at that motel or hotel, and so affordable that there's no excuse not to get one. Construction is top notch, all the hitch pins that make the bar adjustable are held by a detent that doesn't let the pins fall out (you can feel it when you push the pins in). When you fold the bar a magnet keeps it together so it's going to stay compact for storage or travel. The rubber foot pad seems to hold well against tile, wood and carpet so it shouldn't kick out (keep the instructions so you know the proper distance to set the foot pad from the door plane itself). All in all, it's inexpensive peace of mind. Would be a great gift for a college student, senior friend or family member, anyone who lives alone, anyone who rents or anyone who travels. And yourself.
                  by
                  • Recommended
                  1 found this review helpful
                  Heavy Duty
                  This is a very nice security bar by MasterLock. It weighs approximately 2 1/2 pounds and is foldable. A vast improvement from the old aluminum bars of past. NOTE: The maximum extended length is 39 inches. Unfortunately, it was not long enough for my sliding glass door where I wanted to use. I need 46 inches for my slider. It does work well on a hinged door as seen in the photos. It will work with both knobs and lever handles as it has an adjustable rubber strap which will secure it to the knob or hold the folded bar tightly if transporting. It has 22 holes allowing you to adjust to many lengths. It has 4 removeable "pull pins" or "snap buttons" to remove the knob and foot attachments and adjust the length. All in all a very solid security bar for sliding windows and hinged door. I deducted a star because it could have been longer for my sliding door.
                  by
                  • Recommended
                  1 found this review helpful
                  Easy to use and strong security
                  Master Lock Folding Door Security Bar. This is a heavy duty locking bar that is compact and easy to use. Just pull pins and adjust floor to door, re-insert pins that have spring loaded balls to keep them in place and you are done. I tested it on a couple of doors with a tile floor and it worked excellent only moving a half inch on a greasy tile floor. It did not budge on a carpet floor. Perfect to take on vacation for hotel rooms for your main door or a patio door! If I was a teacher I would have one for my classroom door, just in case!
                  by
                  • Recommended
                  4 found this review helpful
                  Showing 1-10 of 433 reviews

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                  Product Snapshot

                  Ideal for added security, this adjustable door bar fits most doors and features a padded foot for enhanced protection.
                  Ideal for reinforcing doors, preventing forced entry with its solid brass construction and stainless steel finish.
                  Ideal for added home security, this adjustable bar fits most doors and windows, expanding from 25 to 43 in.
                  Ideal for customers who want versatile security, ensuring peace of mind for hinged and sliding doors.

                  Adjustable Length

                  Material Strength

                  20-gauge steel
                  Solid brass and stainless steel
                  20 gauge heavy duty steel tube
                  Heavy-duty 20-gauge steel tube

                  Dual Functionality

                  Sliding Door Compatibility

                  Padded Foot