Half-moon nock: which crossbows use it
Where the Half-moon nock is used, its shape, and the compatibility rule that stops a dry-fire.
Dry-fire warning
Crossbow bolt data and archery arrow spine, nock and thread data are quoted from each manufacturer's published figures, owner documentation and industry standards, cited on every page. A nock, spine or grain-weight mismatch can cause a dry-fire that damages the bow and can injure the shooter. Confirm against your own owner's manual and the arrow maker's own chart before shooting, and never drop below the stated minimum total weight.
| Nock | half-moon (moon) nock |
|---|---|
| Form | shallow concave groove across a flat disc; must be indexed to the string |
| Fits | CenterPoint, most Barnett non-Hyper models, and many entry and mid crossbows |
| Compatibility rule | The groove must be indexed square to the string on every shot. If the odd-coloured (index) vane is not down, the string can sit on the rim of the nock and dry-fire the bow. |
Field notes
Used on: CenterPoint, most Barnett non-Hyper models, and many entry and mid crossbows.
The groove must be indexed square to the string on every shot. If the odd-coloured (index) vane is not down, the string can sit on the rim of the nock and dry-fire the bow.
This is the classic manual dry-fire cause. A half-moon nock loaded a quarter-turn off lets the string ride over one wall of the groove. Always seat the index vane where the manual shows.
Crossbows and comparisons
Sources: CenterPoint - 20 inch carbon arrows (half-moon nock) · Crossbow nock types explained (Best Crossbow Source)