Seco-Larm SD-998C-D3Q Surface-Mount Rim Strike — 1500-lb Jaw, 12/24VDC, Tamper-Resistant

Strong, simple security for interior doors

The Seco-Larm SD-998C-D3Q is a surface-mount electric rim strike designed to pair with standard rim-type exit devices that use a 3/4" Pullman latch bolt. Built to endure in demanding entryways, it delivers reliable hold and controlled release with a choice of fail-safe or fail-secure operation. The 12/24 VDC capability keeps installation flexible across access control systems, while the non-polarized connection and horizontal adjustment simplify wiring and alignment during setup.

One of the standout choices for retrofits or new installs is its surface-mount design, which avoids frame cutting and reduces on-site fabrication. This feature, combined with a stainless steel housing, provides a durable, tamper-resistant appearance that blends with metal or wood frames in indoor environments. The unit is tested for long life and high static strength, making it suitable for high-traffic doors where dependable operation matters.

Key benefits at a glance

• Surface-mount design eliminates frame cutting and speeds up installation
• 3/4" latch throw compatibility with standard rim-type exit devices
• Non-polarized wiring and horizontal adjustment simplify setup and alignment
• Reversible, non-handed design for flexible installation on either door leaf
• Stainless steel construction with a concealed mounting aesthetic
• Indoor-use only, designed for controlled entry points in commercial spaces
• Field-selectable fail-safe or fail-secure operation to match door control needs
• Includes spacers for precise spacing and mounting consistency

Security and reliability are reinforced by certifications and real-world testing. The SD-998C series is UL-listed for safety and compatibility with UL-listed exit hardware, with a proven static strength of 1,500 pounds and endurance testing up to 250,000 cycles. The compact 9" x 1-3/4" x 3/4" housing fits neatly on standard door frames, while maintaining strong protection against tampering and unauthorized forced entry in indoor environments. This strike is designed to work with common rim-type devices, including models like SECO-LARM SD-962AR-36A and SD-962AR-36G, ensuring a practical upgrade path for existing systems.

What this means for your doors

• Faster installation with minimal frame modification
• Flexible operation modes to suit security policies
• Durable construction for lasting performance in busy entrances

With its blend of strength, adjustability, and ease of installation, the SD-998C-D3Q provides a practical solution for controlled entry on interior doors.