Us Dime Measurement Breakdown: Exact Diameter, Thickness, and Everyday Scale Guide
By Chloe Bennett
Grabbing a set of digital calipers and clamping them around a coin sounds trivial. Yet hobbyists often report numbers differing noticeably from the Mint’s published 17.91 mm and 1.35 mm specs.
The primary error source is clamping pressure. The copper-nickel clad alloy is somewhat malleable, but more importantly, digital caliper jaws can flex if tightened aggressively. Apply only light fingertip pressure on the caliper thumbwheel until the ground steel jaws touch both opposing rims.
Thickness measurements introduce even more variance. The Mint’s 1.35 mm metric refers to the high point of the raised outer border, known as the rim, not the flat recessed fields behind Roosevelt’s head. Measuring across the center portrait produces a different read than taking a caliper measurement across the perimeter edge. If your caliper rests on Roosevelt's cheekbone rather than the raised outer rim, the thickness gauge will show an artificial discrepancy of 0.10 to 0.20 mm.
Chloe Bennett explores the intersection of pop culture, streaming entertainment, digital trends, and contemporary lifestyle. Her weekly commentary reaches thousands of culture enthusiasts.
