The Sexyloops' Fly Fishing Glossary

AFTM

AFTM stands for the Association of Fishing Tackle Manufacturers.
AFTMA stands for the American Fishing Tackle Manufacturers Association.

The AFTM is a scale of line weights. The heavier the line, the greater the AFTM number. The manufacturers weigh the first 10 yards excluding the level tip and rate the line according to the table.

AFTM Table

AFTM number	In grains (range)	In grams	In ounces
3	100 +/- 6	6.48	0.228
4	120 +/- 6	7.78	0.274
5	140 +/- 6	9.07	0.32
6	160 +/- 8	10.42	0.366
7	185 +/- 8	11.99	0.422
8	210 +/- 8	13.61	0.48
9	240 +/- 10	15.55	0.55
10	280 +/- 10	18.14	0.64
11	330 +/- 12	21.38	0.75
12	380 +/- 12	24.62	0.86

This is the same information as you find here in the beginner's section.

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