What Is Bolt Length?
The overall length of a crossbow bolt, set by the crossbow design and stated in the manual as a limit rather than a preference.
Bolt Length: definition
Also called: arrow length, crossbow bolt size, bolt size, 16 inch 20 inch 22 inch bolt
Bolt length is the overall length of a bolt, normally given in inches. Unlike arrows for a vertical bow, crossbow bolts are not cut to the shooter's draw length. Each crossbow is designed around a particular length, and the manual states it, along with a minimum bolt weight.
Lengths in our reviews include 16, 18 and 20 inches for the REEGOX line, 20 inches for the Ravin R133 and 22 inches for the Carbon Express PileDriver. Where you measure from matters, because makers differ on whether the nock and the tip are included, so read the convention before you compare listings.
A bolt shorter than the rated length can sit wrongly on the rail and may not seat properly against the string. A longer bolt may not fit the crossbow at all. Treat the manual as the limit.
Comparing weight per inch
Grains per inch = bolt weight ÷ bolt length
The 20-inch REEGOX at 425 grains is 425 ÷ 20 = 21.25 grains per inch, and the 22-inch PileDriver at 449 grains is 449 ÷ 22 ≈ 20.4. The numbers are close, which shows why weight and length are better judged together.
Bolt lengths in our reviewed bolts
| Bolt | Length | Weight | Notes |
|---|---|---|---|
| REEGOX 16 in | 16 in | 368 grains | Shortest variant |
| REEGOX 18 in | 18 in | 380 grains | Middle variant |
| REEGOX 20 in | 20 in | 425 grains | Longest variant |
| Ravin R133 | 20 in | 400 grains with a 100-grain field tip | Ravin platforms only |
| Carbon Express PileDriver | 22 in | 449 grains | Universal nock system |
Why Bolt Length matters
Length decides whether a bolt fits your crossbow at all. It also affects weight, which affects speed, trajectory and the point of impact. Two bolts of different lengths with the same tip will not balance in the same way.
Because length comes from the crossbow design rather than from you, it is one of the few specs with a clear right answer: the one in your manual. Buying by a length that looks right, rather than the one that is written down, is a common and avoidable error.
How to read it on a spec sheet
- Find the rated bolt length in your crossbow manual before browsing listings.
- Check whether a listing quotes length with or without nock and tip.
- Look for a pack that offers several lengths and choose the one that matches your manual.
- Read the weight for your specific length, because it changes with it.
- Check any note on cut-to-length requirements. Do not cut bolts unless the maker allows it.
Common mistakes
- Choosing a length because another crossbow uses it.
- Shooting bolts shorter than the rated length.
- Forgetting that weight changes between length variants.
- Cutting bolts shorter without the maker guidance.
- Measuring with a different convention from the listing and ordering the wrong size.
Find your correct bolt length
- Open your manual and write down the rated bolt length and minimum weight.
- Check the tip and nock convention used in the listing you are considering.
- Select the variant that matches the manual.
- Confirm the stated weight is at or above your minimum.
- When the bolts arrive, measure one and compare before shooting.
See it in our reviews
- Reegox Crossbow Bolts — rated 3.9/5
- Carbon Express PileDriver — rated 4.2/5
- Ravin R133 Lighted Arrows — rated 4.5/5
Frequently Asked Questions
What length bolt does my crossbow need?
The length in your crossbow manual. Bolt length is set by the crossbow design, and the manual states it alongside a minimum weight. If you cannot find it, contact the manufacturer before shooting.
What are the common crossbow bolt lengths?
In our reviews, bolts run from 16 to 22 inches, with 20 inches common and 22 inches on the PileDriver. The right length for you depends on your crossbow, not on what is common.
Can I use a shorter bolt?
Not safely if it is shorter than the rated length. A short bolt may not seat correctly or may not be supported properly on the rail. Follow the manual and use the length it states.
Can I use a longer bolt?
Only if the manual allows it. A longer bolt may not fit the crossbow or may change balance. Use the rated length unless the manufacturer says otherwise in writing.
Does bolt length change speed?
Indirectly, through weight. A longer bolt usually weighs more, which tends to lower speed, while a shorter one weighs less. Always stay inside the weight limits in your manual.
How is bolt length measured?
Makers differ on whether they include the nock and tip. Read the listing, measure one bolt you own with the same method, and compare. If unsure, ask the seller before ordering.
Keep learning
Guides that use this term
- GuideHow to Choose Crossbow BoltsChoose crossbow bolts in six steps: match rated length and minimum weight, then compare FOC, nocks, tips and tolerances using a spec table.Read the guide
- GuideBest Crossbow Bolts of 2026Best crossbow bolts of 2026: six reviewed picks from budget 12-packs to premium weight-matched carbon, plus how to choose weight, length, FOC and nocks.Read the guide
- GuideCrossbow Safety Rules for BeginnersCrossbow safety rules for beginners: finger placement, never dry-firing, safe cocking and de-cocking, range etiquette and storage habits that prevent injury.Read the guide
Related terms
- BoltThe projectile a crossbow shoots: a short carbon or aluminum shaft with a nock, vanes and a tip, often called an arrow.
- NockThe rear end of a crossbow bolt that engages the string, available in flat, half-moon, capture and lighted styles.
- GrainThe unit used to weigh crossbow bolts and tips, where 7,000 grains equal one pound, so a 400-grain bolt weighs about 0.9 ounce.
- FOC (Front of Center)The percentage of a bolt’s length by which its balance point sits ahead of the geometric midpoint, a measure of front-weighting.
- RailThe flight deck on top of a crossbow that guides the bolt from the string to the muzzle and often carries a scope mount for accessories.
- Power StrokeThe distance the string travels from its cocked position to rest, which sets how long the limbs have to accelerate the bolt.
Browse the gear
Definitions are general information. Manufacturer figures vary, so follow your crossbow's manual and verify local laws with the relevant authority.