AFTMA

AcronymDefinition
AFTMAAmerican Fishing Tackle Manufacturers Association
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In 1959, members of the American Fishing Tackle Manufacturers Association (AFTMA) realized the need to standardize fly lines by weight in order to help fly fishermen with the task of matching fly lines and fly rods that work well together.
EDITOR'S NOTE: First, I'll remind readers that there's no industry standard for the weight of fly rods, but rather a rodbuilder uses AFTMA line standards to recommend what line should be used for a particular rod.
Checking our catalogues and your math, we do see that the difference between a builder's 8- and 9-weight fly rod is commonly less than .07 ounce, or 30 grains in AFTMA parlance, which as you indicate is about the weight of a dime.