The Easton 5mm FMJ in a 500 spine: 9.1 grains per inch,.204 in bore, the 5mm X nock (9 gr) it takes and the 8-32 thread. Suits a lighter draw of roughly 25 to 45 lb. Sourced.

Updated 05 September 2026.

Archery arrow models · specification

Easton 5mm FMJ in a 500 spine: GPI, bore and nock

The 500 spine of the Easton 5mm FMJ: its exact GPI, the nock and thread it takes, and the draw it suits.

The Easton 5mm FMJ in a 500 spine weighs 9.1 grains per inch and suits a lighter draw of roughly 25 to 45 lb. It takes the 5mm X nock (9 gr) 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 5mm FMJ
Brand	Easton
Spine	500
Outside diameter	.256 in OD
Weight	9.1 GPI
Grains per inch	9.1 GPI
Inside diameter	.204 in
Stock nock	5mm X nock (9 gr)
Stock insert	5mm HIT insert (16 gr)
Point thread	8-32
Straightness	+/-.001 in
Suits	a lighter draw of roughly 25 to 45 lb

The shaft

Easton 5mm FMJ carbon arrow shaft (500 spine)

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Field notes

This is the 500 spine of the Easton 5mm FMJ, a 5mm class (.204 in ID) shaft with a.204 in inside diameter. In this spine it weighs 9.1 grains per inch and measures.256 in OD across. A 500 spine sits at the light band, for lower draw weights and youth-to-adult setups.

Because the bore is.204 in, it takes the 5mm X nock (9 gr) and the 5mm HIT insert (16 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 500 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 5mm FMJthe full shaft spec (250, 300, 340, 400, 500)Easton 5mm 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 Bowhunteranother Easton shaft

Questions and answers

What is the model of the Easton 5mm FMJ in a 500 spine?

Easton 5mm FMJ

What is the brand of the Easton 5mm FMJ in a 500 spine?

Easton

What is the spine of the Easton 5mm FMJ in a 500 spine?

500

What is the outside diameter of the Easton 5mm FMJ in a 500 spine?

.256 in OD