The 5 mm on the side of the arrows I shoot (Easton FMJ arrows) designates the outside diameter of the shaft.

5mm Axis Carbon Arrows

Easton Axis Traditional - The Original Micro Stick-Bow Arrow Doug Easton began his archery company in 1922. His enterprise started out with him in his workshop making handcrafted wood arrows and longbows one at a time.

.204" Easton Half Out 5MM Inserts fit . 204" micro diameter arrows, and taper out to a 5/16" diameter for a flush fit with 5/16" points and broadheads. Measure approximately 1-3/8" long.

All else being equal (weight, durability, cost, etc) smaller has some advantages but on the list of things that will likely make a difference on a particular shot in the next 18years, arrow diameter is way down the list. I've been super happy with 5mm FMJ. Awesome penetration on animals and easy to pull from targets.

Here are the best hunting arrows money can buy!

1. Easton 4MM FMJ. Bowhunting's Flagship Arrow.
2. Easton 4MM AXIS Long Range.
3. Easton 5MM FMJ.
4. Easton 5MM AXIS.
5. Easton 6.5 Match Grade.

204 ID Fletched and Shafts are high-quality arrow components designed to enhance your archery performance. These fletched and shafts have a diameter of 5 MM and an internal diameter (ID) of .

The Easton spine chart recommends a spine of 250 for a 30-inch arrow shot from a bow set at 70 pounds. Cut that arrow length down to 28 inches, and the spine chart recommends a 340 spine.

Arrows Made In USA. Easton's roots go back to 1922 as a family company making handcrafted archery equipment. Today Easton focuses on making the finest products with facilities in Utah, Iowa, and Indiana.

Maximum Insert Diameter: 0.172" (~4.37mm) Tapered End Diameter: 0.157"(~3.99mm) Overall Insert Length: 0.135"(~3.43mm) Dimension "C" below.

5MM Axis – Match Grade

Dr. Ed Ashby recommends a much heavier setup for maximum performance, starting at 650 grains for deer-sized animals. For my personal setup, I found myself somewhere in the middle of those two trains of thought. I shoot 570 grain arrows from my 65-lb Mathews VXR with a 30-inch draw length.

Not only will a heavier arrow hit harder, but it will retain its energy better through the target. This is a big benefit that will lead to more pass-throughs on bigger animals. Heavy arrows will also quiet your bow down. This is due to the heavier arrow simply absorbing more energy on the shot.