Sargent 351-D Drop Bracket EN Finish - Parallel Arm Mounting Solution

The Sargent 351-D Drop Bracket in EN Finish is a high-performance commercial door closer accessory designed specifically for parallel arm (push-side) installations. This mounting plate is the industry-standard mechanical solution for doors with narrow top rails, providing a secure and stable foundation for the Sargent 351 Series Powerglide® Door Closer. When a door's architectural design features a top rail under 5-3/4", a standard closer mounting is impossible; the 351-D bridges this gap, permitting a robust installation on rails as narrow as 3" (76 mm).

Finished in a durable EN Sprayed Aluminum, this bracket offers a clean, professional aesthetic that blends seamlessly with the door closer and aluminum storefront frames. As a vital facility maintenance solution, the 351-D ensures that the closer body is properly supported, preventing the hardware from loosening or stripping out of the door under high-frequency use. Its non-handed design provides maximum field versatility, allowing it to be used on both left-hand and right-hand doors in schools, healthcare facilities, and high-traffic office buildings.

Structural Utility & ANSI Performance Summary

The 351-D Drop Bracket is more than a spacer; it is a structural component that preserves the mechanical integrity and safety certifications of the entrance:

• Top Rail Adaptability: Solves the primary challenge of mounting heavy-duty closers on narrow-stile glass doors or thin-railed metal doors.
• Force Distribution: By using a wider footprint and dedicated fastening points, the plate serves as a stabilization solution, distributing the torque of the parallel arm to prevent door warping or fastener failure.
• Overhead Hardware Compatibility: While the standard requirement is 3", the 351-D is engineered to work in conjunction with auxiliary overhead stops and holders, though rail requirements may vary based on the specific holder used.
• ANSI/BHMA Grade 1 Standards: When used with the Sargent 351 Series, this plate supports the closer’s ANSI/BHMA A156.4 Grade 1 certification, ensuring the door remains compliant with Life Safety Codes and ADA accessibility requirements for millions of cycles.

Technical Specifications

Engineered Solutions for Storefront Security

The Sargent 351-D EN addresses the specific technical hurdles faced by glaziers and facility managers:

• Storefront Retrofit Solution: Aluminum storefront doors are notoriously difficult to fit with heavy-duty closers due to their slim profiles. The 351-D is the primary architectural solution that enables a professional, code-compliant parallel arm installation on these common commercial doors.
• Vandal-Resistant Security: Parallel arm mounting places the closer on the interior (push) side of the door. The 351-D ensures this security solution is achievable even on narrow rails, keeping the closer protected from exterior tampering or weather.
• Hardware Lifecycle Extension: A closer mounted on an unstable rail will eventually leak or fail due to internal stress. This bracket provides a reliability solution by ensuring the closer body remains perfectly level and rigid during operation.
• Aesthetic Consistency: The powder coat finish is factory-matched to the closer cover, providing a seamless design solution that maintains the visual integrity of high-end commercial interiors.
• Simplified Compliance: Ensuring a closer is mounted to factory specifications is a code-compliance solution. This bracket guarantees the mounting geometry is correct, helping the opening pass Fire Marshal and ADA inspections.