Terra Firma FORTIS 4mm Fletched Arrows

When it’s all on the line, shoot with confidence—choose the FORTIS.

The FORTIS 4mm is Terra Firma’s original arrow, tested and proven over more than a decade of successful hunts. Built for serious bowhunters, this shaft delivers a clean balance of speed, precision, and toughness.

Its slim 4mm profile and dense carbon build give it a deadly combo of penetration and stability. Paired with our 60gr alloy outsert system, the FORTIS holds a high FOC for a heavyweight arrow, giving you powerful flight and consistent hits—even when smashing through bone.

This is the arrow that made our name. Reliable. Efficient. Ready for anything.

GPI + O.D PER SPINE

250 - 13.0 gpi - 6.71mm / .264"

300 - 10.8 gpi - 6.34mm / .250"

350 - 9.5 gpi - 6.13mm / .241"

400 - 8.6 gpi - 5.97mm / .235"

500 - 7.6 gpi - 5.77mm / .227"

SPECS

.001" Straightness Tolerance - Every arrow is precision laser checked and sorted meticulously until your 12 pack is perfect.

+/- 1gn Weight Tolerance - Advanced manufacturing and careful quality control ensures consistent weight for every shaft.

4mm / .166" Inner Diameter - Micro diameter for accuracy and wind cutting performance. Compatible with all .166 nocks and other components.

32" shaft length - Ready to be cut down and assembled to your preference.

PACKAGE INCLUDES

12x FORTIS Fletched Arrows with 4x 3inch vanes, strong right helical.

12x FORTIS 60gn Alloy Outserts - Spine Matched. (Must be glued in prior to use)

12x TF .166 Nocks - Short profile and durable.