Shaft Compatibility
Find your fit
Insert sizing is driven by inner diameter — not the shaft's name. Use the chart below to match your shaft to the right CMI component.
How Sizing Works
Measure the inside.
Find Inner Diameter
Match the Size
Verify with Chart
BY INNER DIAMETER.
| INSERT | INNER DIAMETER | WEIGHT | POINT THREAD | MATERIAL | WEIGHT THREAD |
|---|---|---|---|---|---|
| 4MM OUTSERT | .165" (4.2mm) | 50 gr | Standard 8-32 | Titanium / Stainless | Deep-6 / 6-40 |
| 4.5MM OUTSERT | .180" (4.5mm) | 50 gr | Standard 8-32 | Titanium | Deep-6 / 6-40 |
| 5MM HALFOUT | .204" (5.2mm) | 50 gr | Standard 8-32 | Titanium / Stainless | Standard 8-32 |
| 6MM INSERTS | .230" (6.2mm) | 50 gr | Standard 8-32 | Stainless | Standard 8-32 |
| 6.5MM INSERTS | .245" (6.25mm) | 50 / 100 gr | Standard 8-32 | Stainless | Standard 8-32 |
| 4MM DEEP-6 INTERNAL INSERTS | .165" / 4mm | 25 gr | Deep-6 / 6-40 | Stainless | Deep-6 / 6-40 |
| 5MM INTERNAL INSERTS | .204" / 5mm | 50 gr | Standard 8-32 | Stainless | Standard 8-32 |
Build calculators
Dial in your arrow.
Quick hunting reference tools for spine and FOC. Use these as a starting point and confirm final shaft choice before cutting arrows.
Front of center
Measure your finished arrow’s balance point from the throat of the nock.
Result
—
Enter your finished arrow measurements.
Recommended spine
Hunting-only starting point based on chart-style lookup plus setup adjustments.
Recommended hunting spine range
—
Enter your setup details to get a starting-point hunting estimate.
POPULAR SHAFTS, MAPPED.
| BRAND | MODEL | RECOMMENDED CMI INSERT |
|---|---|---|
| EASTON | Axis 4MM | 4MM Insert |
| EASTON | Axis 5MM | 5MM Insert |
| EASTON | FMJ 5MM | 5MM Insert |
| EASTON | 6.5 Match Grade | 6.5MM Insert |
| GOLD TIP | Hunter Pro / XT | 6.5MM Insert |
| GOLD TIP | Pierce Platinum | 4MM Insert |
| GOLD TIP | Airstrike | 5MM Insert |
| VICTORY | VAP TKO | 4MM Insert |
| VICTORY | RIP Elite | 5MM Insert |
| BLACK EAGLE | Spartan | 6MM Insert |
| BLACK EAGLE | Rampage | 6.5MM Insert |
| CARBON EXPRESS | Maxima Sable RZ | 5MM Insert |
Note: Manufacturers occasionally revise shaft specs between production runs. When in doubt, measure your shaft's inner diameter or reach out — we'll confirm fit before you order.
