The Easton 4mm FMJ in a 250 spine: 12.3 grains per inch,.204 in bore, the Easton 4mm Microlite nock it takes and the 8-32 thread. Suits a heavy draw of roughly 65 lb and up. Sourced.

Updated 05 September 2026.

Archery arrow models · specification

Easton 4mm FMJ in a 250 spine: GPI, bore and nock

The 250 spine of the Easton 4mm FMJ: its exact GPI, the nock and thread it takes, and the draw it suits.

The Easton 4mm FMJ in a 250 spine weighs 12.3 grains per inch and suits a heavy draw of roughly 65 lb and up. It takes the Easton 4mm Microlite nock its.204 in bore requires and the 8-32 point thread; confirm on the maker chart for your exact draw and length.

This spinemanufacturer data, cited

Model	Easton 4mm FMJ
Brand	Easton
Spine	250
Outside diameter	.247 in OD
Weight	12.3 GPI
Grains per inch	12.3 GPI
Inside diameter	.204 in
Stock nock	Easton 4mm Microlite nock
Stock insert	Easton 8-32 aluminium half-out (50 gr)
Point thread	8-32
Straightness	+/-.002 in (Match Grade +/-.001)
Suits	a heavy draw of roughly 65 lb and up

The shaft

Easton 4mm FMJ carbon arrow shaft (250 spine)

Shop Easton 4mm FMJ carbon arrow shaft (250 spine) on Amazonaffiliate Find Easton 4mm FMJ carbon arrow shaft (250 spine) on eBayaffiliate

Field notes

This is the 250 spine of the Easton 4mm FMJ, a 4mm micro (aluminium jacket) shaft with a.204 in inside diameter. In this spine it weighs 12.3 grains per inch and measures.247 in OD across. A 250 spine sits at the stiff end of the range, for heavy compound draws and heavier points.

Because the bore is.204 in, it takes the Easton 4mm Microlite nock and the Easton 8-32 aluminium half-out (50 gr), and it threads to the 8-32. Those do not change with spine; only the GPI and outside diameter move across the table.

Spine is a starting point, not a guarantee: a 250 from one brand can differ from another. Read your exact draw weight and arrow length on the maker chart or bare-shaft test before cutting a dozen, and keep the finished arrow above the 5-grains-per-pound floor.

Spec, chart, nock and concept

Easton 4mm FMJthe full shaft spec (250, 300, 340, 400)Easton 4mm FMJ spine chartwhich spine for your draw weight What an arrow spine number meanshow to read the deflection number The nock that fits this borepress-fit nock for the.204 in shaft The 5-grains-per-pound floorkeep the finished arrow heavy enough Easton 6.5mm Hunter Classicanother Easton shaft

Questions and answers

What is the model of the Easton 4mm FMJ in a 250 spine?

Easton 4mm FMJ

What is the brand of the Easton 4mm FMJ in a 250 spine?

Easton

What is the spine of the Easton 4mm FMJ in a 250 spine?

250

What is the outside diameter of the Easton 4mm FMJ in a 250 spine?

.247 in OD