Coins are a vital element of U.S. currency, each designed with features that ensure functionality, security, and visual appeal. Ridges—often called “coin reeding“—stand out as both a practical and aesthetic design element. Reeding protects coins from tampering, enhances their durability, and makes them more identifiable by touch. The number of ridges on U.S. coins varies based on the denomination, and there are distinct reasons for this.
Number of Ridges on U.S. Mint Coins
| Coin | Reeded Edges |
| Cent | None |
| Nickel | None |
| Dime | 118 |
| Quarter | 119 |
| Half Dollar | 150 |
| Dollar | None |
| Gold and Silver American Eagle | 198 |
Dimes
The dime is the smallest coin in circulation by both size and value. While it was originally made of 90% silver, the dime’s ridges protected its metal content. Despite the modern dime’s copper-nickel composition, its reeded edge features 118 ridges, which remains an enduring feature, providing security and aiding in tactile identification. The precision required to produce such ridges demonstrates the technological advancements in coin minting over time.
Quarters
The quarter is one of the most widely used U.S. coins. The 119 ridges of its reeded edge offer a practical advantage for visually impaired individuals, who can distinguish it from the dime by its slightly larger size and additional ridges. The consistency of these ridges over centuries underscores the U.S. Mint’s commitment to quality.
Half Dollars
The half dollar’s reeded edge has 150 ridges. Its larger size and higher number of ridges set it apart from smaller denominations. Though less commonly used today, the half dollar remains a symbol of U.S. coinage history, with its ridges contributing to its durability and functionality. Advances in minting technology have ensured that even this larger coin maintains a precise and uniform design.
Dollar Coins
- Unlike smaller denominations, modern dollar coins such as the Presidential and Sacagawea dollars have smooth edges.
- This design choice allows for edge lettering, which includes details like the year of minting and inscriptions. Smooth edges also distinguish the dollar coin from lower denominations, enhancing usability. The transition to smooth edges reflects both technological progress and a shift in design priorities for this denomination.
American Gold and Silver Eagles
- Special bullion coins like the Gold and Silver American Eagles have 198 ridges. These coins, made primarily for collectors and investors, adhere to the tradition of reeded edges to signify their precious metal content and prevent counterfeiting.
- Interestingly, Gold and Silver Eagles feature a missing ridge, which is a deliberate design element that makes them even harder to counterfeit. This subtle detail underscores the level of precision and security involved in minting these coins.
The Purpose and Function of Reeding Today
Ridges on coins remain relevant for several reasons:
Security Against Counterfeiting
Ridges make it challenging to duplicate coins or alter their physical properties without detection. For collectible coins like the Gold and Silver Eagles, ridges and missing ridges serve as advanced anti-counterfeiting measures.
Tactile Identification
Ridges help visually impaired individuals identify coins by touch, distinguishing between denominations of similar size. While it would not make sense to count the reeded edges individually, the spacing and size make it easy to tell coins apart.
Aesthetic and Traditional Value
Reeded edges connect modern coins to their historical origins.
Technological advancements in coin minting have significantly enhanced the precision of ridge design. High-tech presses and laser-guided engraving now ensure that ridges are uniform and resistant to wear. These advancements also allow for innovative features like edge lettering on modern dollar coins and missing ridges on bullion coins, demonstrating the adaptability of ridge design to meet evolving needs.
Reeded Edges on Other Coins
The use of reeded edges is not unique to the United States. Coins from other countries, such as the British pound or the Euro, also employ reeded edges. However, the number and style of ridges vary based on cultural and functional considerations. For instance, some international coins combine reeded edges with other edge features, such as inscriptions or alternating patterns, to enhance security and usability.
The ridges on U.S. coins are a remarkable blend of functionality, security, and tradition. From the 118 ridges on a dime to the 198 ridges on a Gold or Silver Eagle, these features reflect the meticulous craftsmanship of the U.S. Mint.
