1 x Washer Flat M5X16X1 L Black Zinc Plated

The M5X16X1 L flat washer in black zinc-plated steel is a mounting component used on the central axle of a diabolo to optimize tightening and durability. 1. Positioning and Tightening Function The washer is always inserted between the fixing nut (or screw head) and the bearing surface of the shell or intermediate piece (often called the "cup" or "hub"). Role: It acts as a mechanical interface to evenly distribute the torsional force applied when tightening the M5 nut. In practice: When you tighten the nut onto the axle (which is generally threaded with a 5 mm or M5 thread), the washer prevents the small contact surface of the nut from digging in, scratching, or cracking the plastic or composite material of the diabolo shell. 2. Axial Play Management (Fixed Axle Models) In fixed-axis diabolos, where the cups must be tightened to prevent movement without hindering rotation: The 16 mm diameter washer ensures a stable base and helps maintain the precise spacing (axial play) between the two cups. It helps ensure that the cups remain parallel and do not become misaligned, which is crucial for proper balance and the quality of the diabolo's rotation. 3. Abrasion Protection and Finish The choice of black zinc-plated steel meets durability requirements: Scratch Prevention: The steel, being harder than the cup, protects the diabolo's exterior finish from abrasion due to rotation or frequent loosening/tightening of the nut. Impact Resistance: In case of a fall, the washer absorbs some of the lateral force, protecting the axle threads and the shell's attachment point. Aesthetics: The black coating is preferred in juggling equipment for its discreet and professional appearance, blending visually with the axle and bearings, which are often dark-colored. In short, this washer is used to guarantee optimal and non-destructive tightening of the M5 nut, ensuring the structural integrity of the diabolo shell and the smoothness of its rotation. https://www.netjuggler.net/selection/diabolos-roulements-bille.html

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