Easton 4mm FMJ spine chart: which of its spines (250, 300, 340, 400) suits a light, medium or heavy compound draw, and the point-weight adjustment. Sourced spine data.
Updated 05 September 2026.
Easton 4mm FMJ spine chart: which spine for your draw
Which Easton 4mm FMJ spine to choose for your draw weight and point, from its published range.
| Available spines | 250, 300, 340, 400 |
|---|---|
| Light setup (about 40-50 lb) | 400 spine, the weakest offered that suits a lighter draw |
| Medium setup (about 55-65 lb) | 340 spine, the mid choice with a 100 grain point |
| Heavy setup (about 65-75 lb) | 300 spine, the stiffest choice for a heavy draw or point |
| Point-weight adjustment | Move one spine group stiffer per 25 grains of point weight over 100 grains |
Easton 4mm FMJ carbon arrow shaft
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The Easton 4mm FMJ is offered in 250, 300, 340, 400 spine. Spine tracks draw weight: a lighter bow flexes the shaft less and wants a weaker (higher-number) spine, a heavier bow wants a stiffer (lower-number) one.
These bands follow the widely published spine ranges, roughly 500 to 600 for a 25 to 45 pound draw, 340 to 400 for 45 to 65 pounds, and 250 to 300 for 65 pounds and up, then adjusted for arrow length and point weight.
Treat this as the starting point the way an archery shop does, then confirm your exact draw weight and arrow length on the manufacturer chart or with a bare-shaft test before cutting a dozen.
Spec, concept and worked setups
Questions and answers
Easton 4mm FMJ spine chart: which spine for your draw?
For the Easton 4mm FMJ, a lighter (40-50 lb) setup takes the 400 spine, a medium (55-65 lb) setup the 340, and a heavy (65-75 lb) setup the 300, before adjusting for point weight. Read your exact draw weight and length on the maker's chart.