Easton 5mm FMJ (5mm class (.204 in ID)): published spine and grains-per-inch table, the 5mm X nock (9 gr) it takes, its insert and the 8-32 point thread. Spines 250, 300, 340, 400, 500.
Updated 05 September 2026.
Easton 5mm FMJ: spine, diameter and nock fitment
The published spine and GPI table for the Easton 5mm FMJ, the nock and insert it takes, and the point thread.
| Class | 5mm class (.204 in ID) |
|---|---|
| Inside diameter | .204 in |
| Straightness | +/-.001 in |
| Stock nock | 5mm X nock (9 gr) |
| Stock insert | 5mm HIT insert (16 gr) |
| Point thread | 8-32 |
| Spine 250 | 11.5 GPI,.273 in OD |
| Spine 300 | 12 GPI,.273 in OD |
| Spine 340 | 11.3 GPI,.269 in OD |
| Spine 400 | 10.2 GPI,.263 in OD |
| Spine 500 | 9.1 GPI,.256 in OD |
Easton 5mm FMJ carbon arrow shaft
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The Easton 5mm FMJ is a 5mm-class shaft with a high-strength carbon core inside a 7075-alloy metal jacket and a.204-inch inside diameter, so it takes a 5mm X nock and the 5mm HIT insert.
Its published spines run from 250 at 11.5 grains per inch through the heavy 300 at 12 to a 500 at 9.1 grains per inch, the metal jacket making it heavy and high in front-of-centre.
The.204-inch bore uses the standard 8-32 point thread through the HIT insert, so standard field points and broadheads fit.
Nock, thread, chart and more
Questions and answers
What is the class of the Easton 5mm FMJ?
5mm class (.204 in ID)
What is the inside diameter of the Easton 5mm FMJ?
.204 in
What is the straightness of the Easton 5mm FMJ?
+/-.001 in
What is the stock nock of the Easton 5mm FMJ?
5mm X nock (9 gr)