Sargent 351-A EN Mounting Plate - Narrow Top Rail & Low Clearance Solution

The Sargent 351-A EN Mounting Plate is a high-performance commercial door closer accessory specifically engineered to solve complex installation challenges on narrow-style doors and frames. This heavy-duty plate is required when mounting a Sargent 351 Series Powerglide® Closer in environments where standard mounting patterns are restricted by architectural design. By providing a reinforced and repositioned mounting surface, the 351-A allows for a secure Regular Arm (Pull Side) installation on doors with a minimum top rail of only 2-3/8", or a Top Jamb (Push Side) installation with as little as 1-3/4" of frame clearance.

Finished in EN Sprayed Aluminum, this mounting plate is a critical structural solution for modern aluminum storefronts and glass-heavy doors that prioritize aesthetics but require the durability of a Grade 1 door closer. Without this plate, a high-traffic entrance with a narrow top rail would be susceptible to hardware "pull-out" or operational failure. The non-handed design of the 351-A ensures it can be utilized for left-hand or right-hand applications, making it a versatile facility maintenance solution that preserves the lifecycle of the door closer while ensuring the opening remains fully compliant with ADA accessibility and Life Safety standards.

Mechanical Utility & ANSI Function Summary

The 351-A Mounting Plate serves as a vital structural bridge that adapts the heavy-duty mechanics of the Sargent 351 closer to non-standard frame and door geometries:

• Top Rail Expansion: Effectively "lowers" the mounting pattern, allowing a full-sized Powerglide® closer to fit on doors with a significantly reduced top rail.
• Low Ceiling Optimization: Solves "Top Jamb" mounting conflicts where the ceiling height would otherwise strike the closer body or arm.
• Force Distribution: By utilizing a larger footprint and specialized fastener locations, the plate acts as a stabilization solution, preventing the closer from vibrating loose in high-frequency commercial environments.
• ANSI/BHMA Grade 1 Support: When paired with the 351 series, this plate maintains the hardware’s ANSI/BHMA A156.4 Grade 1 certification, the industry's highest rating for durability, ensuring the door can withstand over two million opening cycles.

[Image showing a top jamb application of the Sargent 351 series closer utilizing a drop plate for low-clearance frames]

Technical Specifications

Engineered Solutions for Modern Storefronts

The Sargent 351-A EN provides targeted mechanical and logistical solutions for glazing contractors and facility managers:

• Narrow-Stile Aluminum Solution: Modern storefront doors often lack the 4" to 5" of top rail required for a standard closer mount. The 351-A is the primary architectural solution that enables the use of heavy-duty hardware without compromising the door's glass-heavy design.
• Overhead Holder Compatibility: This plate is a frequent integration solution for doors that utilize auxiliary overhead door holders, providing the necessary clearance to ensure both pieces of hardware operate without interference.
• Corrective Retrofit Strategy: In renovation projects where original frames were not prepared for closer mounting, the 351-A acts as a retrofit solution, covering old holes and providing a fresh, secure mounting surface that meets current fire and safety codes.
• Enhanced Door Control: By ensuring a perfectly level and rigid mount, the 351-A serves as a performance solution, preventing the hydraulic "chatter" or uneven closing speeds caused by a closer body that is slightly tilted on an uneven rail.
• Aesthetic Consistency: The EN finish provides a high-durability, color-matched facade that blends seamlessly with the closer body and aluminum door frame, offering a professional design solution that looks like an integral part of the original hardware.