STI Bopper Stopper® Protective...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$42.70
STI Bopper Stopper® Protective Covers – Keypad, Lock, and Reader Guards

STI Bopper Stopper® Protective Covers – Keypad, Lock, and Reader Guards

(No reviews yet) Write a Review
New Parts & Accessories Available!

Model: STI-6518

In Stock (leaves warehouse same day if ordered before 3pm ET)

$42.70
Adding to cart… The item has been added
New Parts & Accessories
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

STI Bopper Stopper® Protective Covers – Keypad, Lock, and Reader Guards

The STI Bopper Stopper® Series is a line of rugged polycarbonate covers designed to shield keypads, push buttons, pull stations, biometric readers, and electrical devices from vandalism and accidental damage. Available in multiple sizes and finishes (clear or smoke), these cost-effective enclosures are ideal for protecting essential controls in public, commercial, and industrial settings. Each unit features a stainless steel torsion spring or continuous hinge to maintain closure, and includes installation hardware and gaskets for quick setup. ADA compliant (STI-6518) and backed by a three-year guarantee against polycarbonate breakage under normal use.

Key Features:

  • Tough polycarbonate construction withstands impact and abuse
  • Protects keypads, pull stations, outlets, controls, and more
  • Stainless steel spring keeps cover securely closed (select models)
  • Easy to install with included mounting hardware and gasket
  • Available in clear or smoke finish
  • Temperature range: -40°F to 250°F (-40°C to 121°C)
  • ADA Compliant (STI-6518 only)
  • UL/cUL & CSFM listed (STI-6518 only)
  • Three-year warranty against breakage

 

Model H W D
STI-6518 6.40 in. 4.16 in. 2.03 in.
STI-6520-C
STI-6520-S		 8.5 in. 4.18 in. 3.12 in.
STI-6521-C
STI-6521-S		 8.3 in. 4.18 in. 3.12 in.
STI-6522-C
STI-6522-S		 5.5 in. 4.18 in. 3.12 in.
STI-6529 6.57 in. 5.43 in. 2.67 in.

C = Clear
S = Smoke

Manufacturer Resources

VIEW SPEC SHEET

Product Specs

Included Accessories:
Mounting Hardware and Gasket
Product Line:
STI Bopper Stopper®
Warranty:
Three-Year Guarantee Against Breakage (Normal Use)
Application:
Protects keypads, push buttons, pull stations, outlets, biometric readers
Certifications:
UL/cUL S2466 (STI-6518 only), ADA Compliant (STI-6518), CSFM Approved (STI-6518)
Operating Temperature:
-40°F to 250°F (-40°C to 121°C)
Hinge Type:
Stainless Steel Torsion Spring or Continuous Hinge (model dependent)
Product Group:
Safety
Product Subgroup:
Protective Covers
Product Type:
Bopper Stopper® Protective Covers – Keypad, Lock, and Reader Guards
Product Finish:
Clear, Smoke
Department:
Safety
Installation Options:
Surface Mount (includes hardware and gasket)
Product Material:
Polycarbonate

Parts & Accessories

    Safety Technology International STI-6518 – Frequently Asked Questions

    1) Will an STI Bopper Stopper cover fit over my exterior keypad in an unheated parking garage?
    Temperature range on the Bopper Stopper covers is -40F to 250F (-40C to 121C), so an unheated garage, a loading dock, or an exterior wall is within range. They surface mount over the device with the included hardware and gasket, and the polycarbonate shell is what takes the hit instead of the keypad.
    2) Which Bopper Stopper size do I need to clear my device?
    Five footprints cover the range. The STI-6518 measures 6.40 x 4.16 x 2.03 inches. The STI-6520 is 8.5 x 4.18 x 3.12, the STI-6521 is 8.3 x 4.18 x 3.12, and the STI-6522 is 5.5 x 4.18 x 3.12, all sharing the same width and depth so they differ only in height. The STI-6529 is the widest at 6.57 x 5.43 x 2.67 inches, which is the one to look at for a broader biometric reader or a wide plate. Measure the device plus any wiring or trim it sits on, and pick the shell that clears it inside the depth figure.
    3) Is there an ADA compliant Bopper Stopper cover for a push button by an accessible entrance?
    The STI-6518 is the ADA compliant model in the Bopper Stopper line, and it is the one carrying the UL/cUL S2466 listing and CSFM approval as well. If the cover is going over an accessible-route push button or a device that has to satisfy a fire marshal review, specify the 6518 rather than one of the other sizes.
    4) What is the difference between the enclosed bio reader cover and the open keyless lock cover?
    The open keyless lock cover is cut so the lock or keypad stays reachable without lifting anything, which suits a device people use dozens of times a day. The enclosed bio reader version is a full shell over the reader, so the user lifts the cover to present a finger or hand. Enclosed gives more protection from abuse and weather; open trades some of that for speed of use. Both are offered in clear and smoke.
    5) Should I order the clear or the smoke Bopper Stopper cover?
    Clear leaves the device, its labels, and any status LED fully readable, which is what you want over a pull station, an outlet, or anything with printed instructions. Smoke tints the shell so the device is less conspicuous, useful where you do not want a keypad or reader advertising itself in a public corridor. The enclosed bio reader, open keyless lock, and standard covers are each available both ways.
    6) Does the Bopper Stopper cover stay shut on its own, or do people have to close it?
    Closure is automatic. Depending on the model, the cover uses either a stainless steel torsion spring or a continuous hinge to hold itself closed, so it falls back over the device after each use rather than being left hanging open. Stainless is the right hinge material for a wet or exterior location.
    7) Do I need to buy mounting screws or a gasket separately for an STI Bopper Stopper?
    No extra hardware to order. Each Bopper Stopper ships with its mounting hardware and a gasket, so it is a surface mount straight onto the wall or door around the existing device. The gasket is what seals the shell against the mounting surface. The only add-on worth considering is the Bopper Stopper adapter plate, for a mounting surface the cover cannot sit flat against on its own.
    8) What devices can a Bopper Stopper cover actually go over besides keypads?
    Beyond keypads, the Bopper Stopper covers are used over push buttons, pull stations, electrical outlets, biometric readers, and general controls. For a property manager standardizing a building, that means one product family handles the tenant entry keypad, the exit push button, the fire pull station in the corridor, and the exposed outlet in the laundry room, with the size chosen per device.
    9) Will a polycarbonate cover hold up to real vandalism in a public corridor, or do I need a metal cage?
    Polycarbonate is the impact plastic used for this class of guard, and the shell is what absorbs a strike or a shoulder instead of the keypad behind it. That handles the common problem, which is casual abuse and accidental impact from carts and equipment in public, commercial, and industrial spaces. For a determined attack on a high-risk opening you are into a steel cage instead, but a cage blocks sightlines and needs its own mounting, where these surface mount with the supplied hardware and gasket.
    10) What is the STI Bopper Stopper adapter plate for?
    The adapter plate is the accessory for mounting a Bopper Stopper where the cover cannot bear directly on the surface, for instance over a device on a narrow stile, a raised backbox, or an uneven substrate. It gives the cover a flat, continuous face to seat its gasket against. If your device sits proud of the wall or on trim narrower than the cover footprint, order the plate with it.
    How fast can I get the Safety Technology International STI-6518 delivered?
    Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
    Can I return it if it doesn’t work for me?
    Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
    Does the Safety Technology International STI-6518 come with a warranty?
    Absolutely. The Safety Technology International STI-6518 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
    How do I get technical support or installation help for the Safety Technology International STI-6518?
    You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
    Why buy the Safety Technology International STI-6518 from ZenSupply?
    ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
    !