About this item
The Trimco 3910N is a dust proof strike designed for use with the Trimco 3800 Series automatic, semi-automatic, and manual flush bolt assemblies on paired doors. If you searched "dust proof strike", "dust proof floor strike", or "trimco 3910"-the 3910N is the no-faceplate version of Trimco's standard 3910 dust proof strike, configured specifically for flush floor mount installations.
What a Dust Proof Strike Does
On a pair of doors, the inactive leaf uses flush bolts to secure itself-one bolt goes into the head of the frame and one drops into the floor. The floor bolt drops into a strike recessed into the floor. Without a dust proof strike, that hole in the floor is an open pocket that collects dirt, debris, and moisture over years of use. The bolt also has nothing to guide it cleanly into position when the door closes. The flush bolt can miss the pocket, the pocket fills and the bolt jams, or the door takes repeated impact damage at the bolt tip from misalignment.
A dust proof strike solves both problems. It's a spring-loaded cup mounted in the floor that the flush bolt tip seats into. The spring holds a cover plate over the opening when the bolt is retracted-keeping debris out between uses. When the bolt extends, the tip pushes through the spring-loaded cover and seats in the cup. The door is secured, the bolt is aligned, and the floor pocket stays clean.
What the N Suffix Means: 3910 vs 3910N
The standard 3910 ships with a faceplate-the surface trim piece that finishes the installation and sits proud of the floor surface. The 3910N is the same strike body with the faceplate omitted. The N suffix means no faceplate. You specify the 3910N when the installation calls for a flush floor mount where the strike body sits completely below the finished floor surface with no visible trim ring at floor level. This is the correct configuration for installations where the faceplate would create a trip hazard, where a clean flush floor finish is required, or where the floor material will be finished over the strike after installation.
3/4-Inch Target Area and ADA Soft Spring
The 3910N has a 3/4-inch diameter target area-the opening the flush bolt tip seats into. The larger target provides more tolerance for bolt alignment at the moment of engagement, which matters on high-traffic doors where the door may close at different angles from use wear over time.
The spring in the dust proof strike is intentionally soft. The ADA requirement is that the force to operate hardware should not exceed five pounds. A heavy spring in the floor strike would require the flush bolt to overcome that resistance on engagement, adding friction to the bolt throw. Trimco's soft spring meets ADA compliance without adding operational resistance to the flush bolt assembly.
3910N vs 3911: Standard vs Adjustable Depth
The 3910 and 3910N are fixed-depth strikes. The 3911 is the adjustable version-it ships with a wrench to twist and adjust the strike depth, which is the correct specification when the floor has carpet, a threshold, or a surface that changes the effective depth between the bolt tip and the strike cup. For bare concrete, tile, or hardwood floors where the depth is fixed, the 3910N is the standard specification. For carpet or threshold applications, specify the 3911.
Specifications
Model: Trimco 3910N
Series: Trimco 3910 Series Dust Proof Strike
N Suffix: No faceplate-flush floor mount configuration
Standard Version: 3910 (with faceplate)
Adjustable Version: 3911 (for carpet and threshold)
Overall Size: 3/32" x 1-5/16" x 2-1/2"
Depth: 1-1/2"
Target Area: 3/4" diameter
Spring: Soft spring, ADA compliant
Compatible Flush Bolts: Trimco 3800 Series automatic, semi-automatic, and manual flush bolt assemblies
BHMA Classification: L04021
Material: High-density extrusion body; stainless steel finger
Finishes: Brass, bronze, plated, stainless steel (626/630)
Applications: Paired doors, inactive leaf floor bolt, commercial and institutional
Brand: Trimco Hardware, ASSA ABLOY
American Locksets has stocked Trimco dust proof strikes since 2001.
Trusted Since 2001
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