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The Top Knobs M5-45 is a 45 mm (1-3/4 inch) breakoff machine screw with a Phillips pan head, designed for mounting cabinet knobs and pulls to thicker doors and drawer fronts where a standard-length screw comes up short.
Most cabinet hardware screws ship at a standard length sized for 3/4-inch stock. When a project calls for a thicker profile — a slab door with a decorative overlay, a double-stacked drawer front, or a furniture piece with solid hardwood panels — that standard length runs out of thread before it reaches the knob. The 45 mm M5-45 covers those extra millimeters cleanly. The break-away feature lets you score and snap the screw to the actual thickness on the job, so there is no protruding shank behind the mounting hardware and no need to source a separate length for every door thickness in the project.
The pan head profile sits flat against the back face of the door or drawer front, bearing against the surface rather than pulling into a countersink. This is the correct head style for through-hole mounting of decorative hardware: it distributes clamping force evenly and does not require a recessed hole on the back face. The M5 thread matches the tapped holes found in Top Knobs knobs and pulls, so the screw threads in without adapters or inserts.
This screw is a practical item to keep on hand when a project mixes door and drawer thicknesses, when replacement hardware arrives without fasteners, or when a remodel uncovers doors that are thicker than expected. Designers specifying Top Knobs hardware across a full kitchen or bath can add this SKU to the order to cover any thick-door positions without holding up the install for a separate fastener run.
A breakoff screw is scored at intervals along the shank. You thread the screw through the door and into the hardware, then snap the excess shank off at the score mark closest to the back face of the door. The result is a screw trimmed to the actual thickness of the material without cutting tools.
No. 8-32 is the North American standard thread for most cabinet knobs and pulls. M5 is a metric thread used by some European-designed hardware lines, including certain Top Knobs products. Check the tapped hole in your specific hardware before ordering to confirm which thread is required.
At 45 mm, this screw reaches through doors and drawer fronts up to roughly 1-1/2 inches thick after accounting for the hardware base and a small amount of thread engagement. The break-away design lets you trim it shorter for thinner material in the same range.
It can be used with any hardware that has M5-threaded mounting holes. Because M5 is less common in North American hardware than 8-32, confirm the thread specification of your knobs or pulls before substituting.
When the standard screw in the box is not long enough for the door at hand, the M5-45 gives installers and cabinet shops a single screw that covers the range — snap it to length at the score mark and the hardware seats correctly the first time.
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