Easton
4mm FMJ spine chart and specs
The Easton 4mm FMJ is a carbon/aluminum hunting arrow shaft offered in 4 spines from 250 to 400, weighing 9.8 to 12.3 grains per inch. Carbon core with full 7075 metal jacket: heavy, quiet, easy pulls.
4mm FMJ spine chart
| Spine | GPI | OD | Bare @ 28″ | Bare @ 29″ | Bare @ 30″ | Build |
|---|---|---|---|---|---|---|
| 250 | 12.3 | 0.247″ | 344 gr | 357 gr | 369 gr | |
| 300 | 11.7 | 0.244″ | 328 gr | 339 gr | 351 gr | |
| 340 | 11.0 | 0.240″ | 308 gr | 319 gr | 330 gr | |
| 400 | 9.8 | 0.234″ | 274 gr | 284 gr | 294 gr |
Bare weights are shaft only (GPI × carbon-to-carbon length), before points, inserts, nocks and vanes. Diameters in inches.
Components and construction
Material
carbon/aluminum
Straightness
Standard: ±0.002" · $264.99/dz at Lancaster
Match Grade: ±0.001" · $316.99/dz at Lancaster
Nock system
4mm Microlite nock pre-installed (6 gr)
Point system
8-32 aluminum half-out 50 gr included; Ti 55 gr / steel 95 gr options
Factory components
nock 6 gr, insert 50 gr
Street prices were captured at Lancaster in Sep 2026 and may have changed.