Stalwart IS Anti-Ram Barrier & High Security Steel Fence

The Stalwart IS (Impasse Security) system the integrates a high security fence with an anti-ram barrier.

Stalwart IS anti-ram high-security fence


Ameristar's Stalwart IS (Impasse Security) system combines the functionality and design elements of a high-security fence with an anti-ram barrier. The design features that define the Impasse fence framework are used to conceal and carry the anti-ram cable, which in turn transforms the Impasse steel fence into the Stalwart IS crash fence system.

The Stalwart anti-crash cable barrier has been engineered and tested in compliance with current ASTM F2656-07 (Standard Test Method for Vehicle Crash Testing of Perimeter Barriers), and provides protection against multiple vehicle threats. Additionally, the Stalwart is an 'Approved Product for Homeland Security' under the Support Anti-terrorism by Fostering Effective Technologies Act (the SAFETY Act).

Anti-Ram Ratings Available
K12 Crash Test CertifiedK8 Crash Test RatedPU60 / P2 Crash RatedPU50/P2 Crash Test RatedM50/P1 Crash RatedM40/P2 Crash Test RatedM30/P2 Crash Test RatedM30/P1 Anti-Ram Certified


The threatening visual appearance of the Impasse palisade security fence serves as an effective deterrent to intruders.


The Impasse rail framework provides a platform to integrate various security peripherals required on high-security perimeter designs.


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  • Styles

    Stalwart IS Styles

    Gauntlet Style Gauntlet Style: The Stalwart IS Gauntlet style fence has high-tensile steel corrugated pales that rise above the uppermost rail with an outward curve and intimidate with a triple-pointed and splayed spear tip.  The sharp-edged spear tip deters intruders from climbing and is ideal for an anti-climb or anti-scale fence system.

    Trident Style Trident Style: The Stalwart IS Trident style fence has high-tensile steel corrugated pales that rise above the uppermost rail and deter with a razor-sharp triple-pointed and splayed spear tip.

    Stronghold Style Stronghold Style: For a stately appearance, choose the Stalwart IS Stronghold style fence with blunt, slightly rounded tips and strong, high-tensile steel pales. The Stronghold fence offers the same structural configuration as the Trident and Gauntlet, minus the razor-sharp tips.

  • Colors


    This product is available in blackbronze, white or desert sand. Please note that colors vary by computer monitor.

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  • Gates

    Stalwart IS Gate Options

    TransPort IS Cantilever Sliding Gates TransPort IS: The TransPort IS cantilever sliding gates will give your perimeter's entry point safe and secure vehicle access control for years to come. Click here for the full specifications on TransPort IS gates.

    PassPort IS Sliding Roll Gates PassPort IS: The PassPort IS sliding roll gates are fully-welded for enhanced durability and strength. Plus, it features the PermaCoat double coating process for increased weather resistance and reduced corrosion resisting. Click here for the full specifications on PassPort IS gates.

    Swing Gates Swing Gates: Stalwart IS swing gates are made of 2" x 11 ga. pre-galvanized steel rails and gate ends. Each swing gate system has 1/4" steel gussets welded at each upright to rail connection, and are balanced with a heavy duty cable and turnbuckle which span across each gate bay. The Stalwart IS single and double swing gates help provide a simplistic solution for gaining access to any project.


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  • Integrated Design

    Integrated Design

    The specially formed high-strength architectural shape of the Impasse rail is contoured to carry anti-ram steel cable and/or detection equipment. This helps you consolidate your physical security protection into a single perimeter solution.

    Impasse rail as raceway for wiring Intrusion Detection Systems (IDS): Use the Impasse rail to covertly secure IDS to the security fence.

    The Impasse rail can also easily integrate any intrusion detection sensor. The distinctively shaped Impasse rail conceals IDS cables to delay, deny, deter and detect intruders. Also, the rail features a secure IDS attachment to help keep the sensor cables in place and minimize the number of false alarms. So you can rest assured the Impasse rail will increase the probability of detection.


    Impasse rail as raceway for wiring Conduits: Use the Stalwart's Impasse rail as a conduit tray for electrical conduits. The high cost associated with securing an asset are often overlooked until the last minute. Some of the items used in modern perimeter security systems include lighting, access control wiring, intrusion detection sensor wiring, CCTV cables, communication fiber and electrical wiring.

    As an added benefit, the Impasse rail can house all the components needed to install a perimeter security system. This allows for quicker installation and minimized construction cost from not having to incur the cost of trenching or boring.


    Impasse rail as raceway for wiring. Video and Communications Wiring Use the Impasse rail to carry communication cables along the perimeter.

    The Impasse rail delivers added value with its ability to also incorporate wiring for video, CCTV and other communications. When video and communication systems are installed the probability of detection is higher.


    Impasse Rail with Access Control Access Control Wiring Use the Impasse rail to carry communication cables along the perimeter.

    Access control is a key factor in perimeter security systems. Take advantage of the Impasse rail to carry access control wiring from one entry control point to the next and avoid the burdensome cost of a patchwork design using trenching and boring.


    Impasse with Anti-Ram Barrier Anti-Ram Cable Conceal crash barrier components easily with the Impasse rail.

    The Impasse rail is specially designed to incorporate the cable of the Stalwart anti-ram barrier system. The standard 4 and 5 rail configurations are made to meet the specifications of the Stalwart anti-ram barrier. If need be, the Stalwart anti-ram barrier can be installed into the 4 or 5 rail fence at a later date.

  • Maintenance-Free Coating

    Ameristar's PermaCoat process has a proven track record for high performance. The galvanized base material with dual-layer epoxy and polyester coating delivers a long-lasting, maintenance-free finish.

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  • SAFETY Act Certified

    U.S. Department of Homeland SecurityAmeristar manufactures the only fence and barrier products certified under the SAFETY Act by the U.S. Department of Homeland Security. Read more about the SAFETY Act now.

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