A crossbow bolt is the ammunition a crossbow fires - the projectile that leaves the rail when you pull the trigger. It looks like a short arrow, and that is essentially what it is: a shaft with a nock at the back, fletching to stabilise it in flight, and a point at the front. The differences from a vertical-bow arrow are real but smaller than the two names suggest, and once you understand the parts you can buy bolts with confidence instead of guessing at a store shelf.
Bolt or arrow - is there a difference?
The words are often used interchangeably, and both are correct. Historically a bolt was shorter and sometimes had no fletching; today a crossbow bolt is simply a short, stiff arrow designed for the geometry of a crossbow. The practical differences are length - crossbow bolts are much shorter than the arrows shot from a compound or recurve bow - and spine, meaning the shaft is built stiffer to survive the sudden, high acceleration off a crossbow rail. Call them bolts or arrows; what matters is that they are the ones made for a crossbow.
The parts of a bolt
| Part | What it does | Why it matters |
|---|---|---|
| Shaft | The main body, usually carbon or aluminium | Sets weight, stiffness and durability |
| Nock | Rear fitting that sits against the string | Must match your bow - flat, half-moon or brand-specific |
| Fletching (vanes) | The fins near the back | Stabilise the bolt in flight; usually three per bolt |
| Insert | Threaded fitting at the front of the shaft | Lets you screw in field points or broadheads |
| Point / tip | Field point for practice, broadhead for hunting | Changes the bolt's job and its balance |
The nock is the part that trips people up most. A flat nock sits square against the string; a half-moon nock has a groove that must be aligned with the string each time; and several brands use their own proprietary nock, such as Omni or the systems used by premium makers. Fit the wrong nock and the string can slip past the bolt, which causes a dry-fire. This is why matching bolts to your specific bow matters more than any single spec.
Length, material and weight
Twenty inches is the standard length for most modern full-size crossbows, and it is what the vast majority of beginner bows are built around. Some legacy and compact reverse-draw models use 22-inch or 16-to-18-inch bolts, so check your manual before buying. On material, carbon has become the default because it is tough, consistent and forgiving; aluminium still exists but is largely a legacy choice. Weight matters too: a heavier bolt carries more downrange energy and penetrates better, while a very light bolt below your bow's minimum is a dry-fire risk. Most bows are happy around a 400-grain total, and going lighter than the stated minimum is the one line you should never cross.
Field points versus broadheads
The same bolt does two jobs depending on the tip you thread in. Field points are simple, cheap and used for practice and target work; broadheads are the wide cutting tips used for hunting. Because a broadhead's blades catch the air, a bolt often flies slightly differently once you switch, which is why hunters practise with field points and then re-check zero with the broadheads they will actually hunt with. The bolt itself, though, is the constant.
Buying the right ones
Match length first, then nock type, then total weight including the point. Every full-size bow in our ranking uses 20-inch carbon bolts, so third-party 20-inch carbon of matching weight and nock is broadly interchangeable - but proprietary-nock brands are the exception and need their own bolts. For the models and specifics, our guide to the best crossbow bolts breaks down length, weight and compatibility, and brand-specific pages like the one on Excalibur crossbow bolts cover the systems that do not mix. If you want to understand how bolt weight plays into range and energy, our note on how far a crossbow can shoot covers that trade-off in detail.