The Sylvan Round Rose Adaptor Plate is the ultimate commercial-grade problem solver for door hardware retrofits, renovations, and lock upgrades. Specifically engineered to bridge the structural gap between oversized door preps and modern door furniture, these plates allow you to seamlessly install sleek, small-footprint lever handles directly over large, existing cross-bore cutouts.
Upgrading old residential locksets or legacy knobsets often leaves behind a messy, standard 54mm cross-bore hole in the door face. Attempting to mount a modern, standard-sized round rose lever handle directly over that cavity means the hardware will fall through, leaving no material for the mounting screws to bite into. The Sylvan Adaptor Plate safely sandwiches the door cavity from both sides, providing a rock-solid, solid-metal surface that completely masks raw, splintered, or damaged timber edges.
Key Features
Universal 54mm Bore Coverage: Features a clean 65mm outer diameter, creating a professional, symmetrical metal reveal border when paired with standard residential or commercial round rose levers.
Premium Grade 304 Stainless Steel: Stamped from high-quality Grade 304 Stainless Steel, offering exceptional structural strength, rigidity, and long-term durability for high-traffic interior applications and standard commercial environments.
Satin Stainless Steel Finish: Features a clean, brushed surface coat designed to perfectly complement the color tone, cool metallic profile, and grain direction of standard satin stainless steel and chrome door furniture.
Universal Fixing Centers: Engineered with pre-drilled tie-bolt mounting slots to comfortably accommodate standard round rose lever furniture that utilizes matching through-fixing male/female screw configurations.
Rust & Corrosion Resistant: Solid steel construction eliminates material compatibility issues and withstands heavy wear. (Note: For extreme, fully exposed seaside or marine environments, Grade 316 door furniture or regular lanolin maintenance is recommended).
Complete Set: Supplied as a matching pair (inner and outer plates for a single door) with low-profile, flat-head mounting hardware included.
Technical Specifications Matrix
Engineering Property
Verified Product Specification
Brand
Sylvan
Material
Grade 304 Stainless Steel
Finish
Satin Stainless Steel (SSS)
Outer Diameter
65 mm
Compatibility
Suits round rose levers with compatible matching through-fixing centers
Designed For
Converting and covering 54mm cross-bore holes
Packaging
Supplied as a pair (Inner & Outer plates)
💡 Locksmith’s Installation Note:
When installing these adaptor plates over an existing 54mm cavity, avoid overtightening the tie-bolts initially. Ensure the internal lever spindle aligns perfectly straight through the center hole before securing the flat-head screws. If the adaptor plates are slightly askew, it can create mechanical friction on the lever return springs, causing your handles to stick or fail to spring back cleanly to the horizontal position.
Sylvan 65mm Round Rose Adaptor Plates (Pair)
$25.00 incl gst
Description
The Sylvan Round Rose Adaptor Plate is the ultimate commercial-grade problem solver for door hardware retrofits, renovations, and lock upgrades. Specifically engineered to bridge the structural gap between oversized door preps and modern door furniture, these plates allow you to seamlessly install sleek, small-footprint lever handles directly over large, existing cross-bore cutouts.
Upgrading old residential locksets or legacy knobsets often leaves behind a messy, standard 54mm cross-bore hole in the door face. Attempting to mount a modern, standard-sized round rose lever handle directly over that cavity means the hardware will fall through, leaving no material for the mounting screws to bite into. The Sylvan Adaptor Plate safely sandwiches the door cavity from both sides, providing a rock-solid, solid-metal surface that completely masks raw, splintered, or damaged timber edges.
Key Features
Technical Specifications Matrix
💡 Locksmith’s Installation Note:
When installing these adaptor plates over an existing 54mm cavity, avoid overtightening the tie-bolts initially. Ensure the internal lever spindle aligns perfectly straight through the center hole before securing the flat-head screws. If the adaptor plates are slightly askew, it can create mechanical friction on the lever return springs, causing your handles to stick or fail to spring back cleanly to the horizontal position.
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