Bulletproof Hollow Metal Frame
Our bullet-resistant hollow metal frame is constructed of 16-gauge cold-rolled steel and is typically used to secure drywall or masonry openings. It is available in multiple frame depths to allow for maximum customization and pairing with ballistic glazing. The hollow design allows your barrier to “capture” and retain a speeding bullet, lessening the potential of a random injury or lateral penetration. Most businesses choose this framing to match an existing aesthetic in their facility while reinforcing ballistic barriers.
Hollow Frame Uses
These frames are typically used to seal masonry or drywall openings. Because it is nearly impossible to pack the channel opening, channels for hollow metal framing systems are not tested to UL bulletproof standards. They can, however, be reinforced with ballistic fiberglass, or TSS armor plates to achieve a higher protection level. By integrating this solution into your security system design from the beginning, you ensure your ballistic barriers work as intended and save yourself the headache of retrofitting frames down the road.
Design
Each 16-gauge hollow steel frame comes in a standard prime-painted gray finish and can be paired with ¾” to 2 5/16” thick bulletproof glazing.
View detailed information on our product specifications page.
Frequently Asked Questions
Are hollow metal frames themselves bullet-resistant?
No. Hollow metal frames made from 16-gauge cold-rolled steel are not ballistically rated on their own. However, they’re designed to house ballistic glazing and can be reinforced with fiberglass panels or armor plating to meet UL 752 ballistic standards when integrated into a complete security system.
Why choose hollow metal frames over other framing options?
Hollow metal frames are durable, cost-effective, and easy to maintain—ideal for high-traffic environments. Their industrial aesthetic blends seamlessly into facilities already using steel construction (e.g., existing stainless steel counters). If your project requires strength, longevity, and a straightforward visual match, they’re a reliable option.
Can hollow metal window frames be adjusted on-site?
Typically, no. Hollow metal window frames are precision-welded and shipped as complete, install-ready units. Unlike modular framing systems, they don’t allow for on-site resizing or adjustment. If changes are needed, it’s usually easier to adjust the opening in the wall rather than modify the frame itself.
How do hollow metal frames compare to stainless steel frames?
Stainless steel frames offer the same ballistic performance as hollow metal frames but are chosen for their premium appearance—often used in banks, government buildings, and other high-end applications.
What accessories can be integrated into bullet-resistant windows?
Common accessories include deal trays and currency trays for secure transactions, package passers for larger item exchanges, and natural voice transmission features like talk-thru baffles or voice ports to maintain clear communication without opening the barrier.
What are the main bullet-resistant glazing types?
The four primary types are acrylic, polycarbonate, glass-clad polycarbonate, and insulated glass. Each material offers different advantages depending on the required security level. Acrylic and polycarbonate are common for interior applications and lower-level protection. Glass-clad polycarbonate and insulated glass are preferred for higher security levels, exterior use, and enhanced durability.
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