Extension Lip for the AS900 and AS900M

In the world of access control, standard electric strikes are designed for standard frame depths. However, when dealing with specialized architectural frames, double doors, or heavy-duty timber surrounds, a standard strike plate often falls short of the door’s latch. The extension lip is an engineered attachment that extends the “ramp” of the electric strike, ensuring that the door latch transitions smoothly and securely into the locking mechanism without catching on the frame.

Available in various widths (typically ranging from 15mm to 50mm+), the extension lip allows for a clean, professional finish on non-standard installations. By utilizing, you eliminate the need for dangerous and unsightly “hacking” of the door frame, maintaining the fire rating and structural integrity of the entrance while ensuring 100% reliable locking.

Why an Extension Lip is Vital for Custom Frames

The primary function  is to provide a continuous, smooth surface for the spring latch to glide over before it drops into the strike keeper.

• Precision Fitment: The extension lip comes in multiple lengths to match the exact distance between the strike body and the edge of the door frame.

• High-Grade Stainless Steel: Every extension lip is forged from durable, corrosion-resistant steel to withstand the constant friction of door operations.

• Seamless Integration: Designed to bolt directly onto compatible electric strike bodies, the extension lip creates a unified, flush-mounting appearance.

• Protects Door Frames: By extending the strike surface, the extension lip prevents the door latch from gouging or wearing down expensive timber or aluminum frames.

• Fire-Rated Compatibility: Most extension lip accessories are designed to maintain the integrity of fire-listed door assemblies when installed correctly.

• Universal Architectural Finishes: Available in Brushed Stainless Steel, Polished Chrome, and Matte Black to coordinate with existing door hardware.

• Easy Retrofitting: An extension lip can be added to an existing installation if a new door or seal has changed the latch alignment.

Technical Specifications

Achieving a High-Precision Installation

When selecting an extension lip, measurement is everything. You must measure from the center of the strike mounting holes to the edge of the door frame (the “jamb”). Adding an extension lip that is slightly too long is generally better than one that is too short, as it ensures the latch never makes contact with the raw frame material.

For high-traffic commercial doors, we recommend applying a small amount of low-friction lubricant to the surface . This ensures a “silent” close and reduces wear on the door’s latch bolt over thousands of cycles. Complete your access control setup that provides the perfect marriage of security and architectural precision.

The Extension Lip for the AS900 and AS900M is a precision-engineered accessory designed to enhance the performance and flexibility of your electric strike system. Built to suit the AS900 and AS900M series, this  provides extra door frame coverage, ensuring smoother operation and improved compatibility with a variety of door setups. Its durable construction guarantees long-lasting reliability, making it a trusted addition to professional access control installations.

Easy to fit and designed for seamless integration, the AS900/AS900M Extension Lip is ideal for installers seeking a clean, professional finish without compromising on strength or security. By extending the reach of your strike, it eliminates alignment issues and ensures doors close securely every time. Perfect for commercial, industrial, or high-security environments, this extension lip delivers both functionality and peace of mind when used with AS900 and AS900M electric strikes.