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The Top Knobs M4-45 is a 45mm (1-3/4 inch) break-off machine screw with a Phillips pan head, designed to mount cabinet knobs, pulls, and decorative hardware through thicker door and drawer stock. The break-off design lets the excess shank snap away cleanly after the hardware is seated, leaving no protrusion behind the panel.
Hardware installation on standard 3/4-inch cabinet doors is straightforward, but thicker stock changes the math. Overlay doors with added veneer, solid-wood drawer fronts milled to a full inch, and double-thickness panels all demand a longer screw than the short sizes handle comfortably. The 45mm shank bridges those extra millimeters so the thread fully engages the hardware base before the break-off point is reached. It is also useful when a spacer, backplate, or decorative rosette adds depth between the hardware and the door face, pushing the base further from the panel surface.
The screw is manufactured with a reduced-diameter neck above the thread. Once the hardware is tightened to the panel, firm pressure on the excess shank causes it to shear at that neck, leaving the fastener seated and the back of the door clear. No grinding, cutting, or filing is needed. The pan head on the front side provides a flat, even bearing surface that seats against the hardware base without requiring a countersink in the door. It holds the hardware clamped squarely to the face of the panel.
Cabinet installers working on site benefit from having a longer screw in the bag when door thickness varies across a job. Designers specifying hardware for furniture-grade pieces with thick solid-wood fronts can call out M4-45 without worrying about the screw falling short. Homeowners swapping out knobs on older cabinetry with non-standard door thickness will find this length more forgiving than a shorter option. Because Top Knobs supplies this screw to accompany their own hardware line, it is also a reliable replacement or supplemental fastener for any Top Knobs pull or knob installation where the included screw was too short for the application.
If your cabinet door or drawer front is thicker than standard 3/4-inch stock, or if you are installing hardware over a backplate or spacer, the shorter lengths may not leave enough thread to fully engage the hardware base. The 45mm shank provides additional reach for those situations.
After the hardware is tightened against the panel, apply lateral pressure or a firm snap to the protruding portion of the shank. The screw is designed to shear at a reduced-diameter neck, leaving the seated fastener flush or recessed. No cutting tool is required.
M4 is a metric thread used across Top Knobs hardware and a wide range of European and metric-standard decorative hardware. It is not the same as the 8-32 thread common in North American cabinet hardware, so confirm your hardware's thread spec before ordering.
This screw uses a standard #2 Phillips bit. No specialty driver is needed.
Once the shank breaks away, the remaining portion is recessed and has no drive recess accessible from the back. Removal at that point would require a drill-out. Plan the installation before tightening to final torque.
When thicker doors, backplates, or spacers put a standard short screw just out of reach, the M4-45 gives you the length to complete the install cleanly and leave no hardware proud of the panel.
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