Barrel materials
Three materials show up in dart barrels: brass , nickel-silver , and tungsten alloy . "Steel" isn't one of them — steel is the point, and every steel-tip dart has one regardless of what the barrel is made from.
Nickel-silver is a copper-zinc-nickel alloy that contains no silver and no tungsten. It sits close to brass in density, so it's a price and finish tier rather than a performance one — more on that below.
Tungsten barrels aren't pure tungsten; they're alloys, typically following ASTM B777 grades: 80% tungsten with a nickel binder at the entry tier, 90% (the professional standard) in the middle, up to 95–97% at the premium end.
Density and diameter
The whole material comparison reduces to one property: density . A denser material packs the same mass into less volume, which means a smaller barrel diameter at the same weight.
| Material | Density (g/cm³) |
|---|---|
| Brass | 8.50 |
| Nickel-silver | 8.58–8.75 |
| 80% tungsten | 15.4 |
| 90% tungsten (Class 1, ASTM B777) | 17.0 |
| 92.5% tungsten (Class 2) | 17.5 |
| 95% tungsten (Class 3) | 18.0 |
| 97% tungsten (Class 4) | 18.5 |
Measured products at 22g bear this out: an 80% tungsten barrel runs around 6.8mm , a 90% barrel around 6.35–7.05mm depending on length and profile, and a 95% barrel around 6.0–6.5mm . A brass barrel at a similar weight runs 9–9.2mm — nearly 30% wider than 90% tungsten at the same mass.
The biggest jump is brass to tungsten at all — roughly 2.5mm of diameter, and it's the difference between overhanging the treble bed and fitting inside it. Each step up the tungsten ladder after that buys less: 80% to 90% is worth more than 90% to 95%, and 95% to 97% buys the least of all. Serious players paying for that last percentage point are buying a small, real edge — not a proportional one.
Why a small diameter difference matters more than it looks
Two darts collide when their centres come within one barrel diameter of each other. That means the target you're trying to avoid — the effective collision cross-section — scales with the square of the diameter, not the diameter itself.
That's why upgrades that look like fractions of a millimetre on a spec sheet produce grouping improvements players can actually feel. A thinner barrel doesn't just take up less space in the bed — it also reduces the deflection angle when an incoming dart does clip one already in the board, so the same upgrade helps both the frequency and the severity of collisions.
What the treble bed actually constrains
A standard board's treble ring runs from a 99mm to a 107mm radius — a radial depth of about 8mm . That 8mm band, not the arc width of the segment, is what a dart's barrel has to fit inside. A brass barrel at roughly 9.2mm already overhangs it before a second or third dart is even in the picture.
Tungsten barrels fit comfortably inside that band with room to spare — a 90% barrel at 7mm leaves roughly 1mm of clearance, a 95% barrel closer to 1.5mm. That headroom is what a following dart has to share with whatever's already sitting in the bed.
Weight
Weight is the variable everything else in this guide sits on top of, because it's the one that changes the physics of the throw itself rather than just the barrel's footprint. The governing relationship is simple — momentum equals mass times velocity — but its consequences run through nearly every complaint a tight grouping produces.
A heavier dart carries more momentum at the same release speed, which makes it less easily knocked off line by minor release flaws, air movement, or a graze off another dart already in the board. That extra momentum also tends to flatten the arc: a heavier dart needs less upward loft to reach the board, so it approaches on a more direct line, which matters because a flatter entry angle is what lets three darts stack into a narrow treble bed without the trailing darts drifting low. A lighter dart needs more arc — or more force — to cover the same distance, which gives it a longer flight for small release errors to compound over, and makes deflections off an existing dart more consequential rather than less.
None of that makes heavier strictly better. The same momentum that resists deflection also has to be generated by the arm on every throw, and a dart that's forgiving over one leg becomes fatiguing over a three-hour session — accuracy erodes late in a long match well before technique consciously breaks down. A lighter dart rewards a consistent release with more precise, more direct feedback, which is exactly why some of the most accurate players on tour throw at the light end of the range rather than the heavy one.
Stephen Bunting plays at 18g. Ryan Searle plays at 32g. Both are top-15 professionals, and the gap between their setups is nearly double. The weight printed on a barrel is the barrel alone — under WDF and Darts Regulation Authority definitions, a dart's weight is the point, barrel and flighted stem together, so the assembled dart you actually throw always runs a gram or more over the number on the packet. Matching a favourite player's barrel weight without matching their barrel length, shaft and flight gets you a dart with the same number on it and a different feel in the hand.
Weight and diameter are independent
These get conflated constantly, and they're two separate levers. Weight determines your throw — trajectory, required force, how the dart feels leaving your hand. Tungsten percentage determines the diameter you get at a given weight. Changing one doesn't require changing the other.
Concretely: a 24g 90% tungsten barrel and a 24g brass barrel weigh exactly the same and throw with the same required force, but the tungsten barrel is roughly 30% narrower. If deflections off the barrel itself are your problem, percentage (or barrel length) is the direct fix — dropping weight to chase a slimmer profile means relearning your whole throw for a smaller gain than a percentage or length change would give you at the weight you already play.
Barrel profile and shape
Where the maximum diameter sits along the barrel matters as much as what that maximum is. A straight barrel holds close to one diameter along its length. A torpedo profile bulges in the middle and tapers at both ends. A bomb profile front-loads the weight and width toward the point. A scalloped barrel is straight with grip cuts machined into it rather than a shape change.
For grouping specifically, what matters is the diameter at the point on the barrel where a following dart is most likely to make contact — usually toward the rear, near where the shaft begins. Two barrels with the same maximum diameter can behave differently in a tight group if that maximum sits in different places.
Shafts
The shaft connects the barrel to the flight and sets the flight's distance from the barrel, which shifts the dart's centre of gravity and how much leverage the flight has to correct a wobble.
Only the point enters the board. The barrel, shaft and flight all stay outside the sisal, projecting forward from wherever the point is embedded — which is exactly why shaft and flight length matter for the collisions discussed throughout this guide: they're the part still standing proud of the board face, in the path of the next dart, not something buried alongside the point.
Shaft length is the one spec in this guide without a reliable number. Manufacturers measure differently — some include the threading and flight prongs in the stated length, others measure only the visible body — so a "medium" from one brand can be a genuinely different length from a "medium" from another. Categories (short, intermediate, medium, long) are consistent in relative order across brands; specific millimetre figures aren't.
What is consistent: a shorter shaft moves the dart's balance point toward the front and gives a following dart less shaft to clear, at the cost of less corrective leverage on the flight — more sensitive to a slightly off release. A longer shaft gives the flight more leverage to correct a wobble and suits a heavier front-weighted barrel, at the cost of presenting more length for an incoming dart to catch.
Flights
Flight shape trades stability for size. A larger flight catches more air, correcting a mistimed release more forcefully; a smaller flight catches less, flies flatter and faster, and leaves less surface for an incoming dart to strike.
| Shape | Typical size | Bounding area | vs. Standard |
|---|---|---|---|
| Standard | 42.5 × 34mm | 14.5 cm² | — |
| Kite | 38 × 28mm | 10.6 cm² | −26% |
| Slim | 44 × 24mm | 10.6 cm² | −27% |
| Pear / teardrop | 32 × 24mm | 7.7 cm² | −47% |
These are bounding-rectangle figures, not the manufacturer's cut surface area — the actual cut area is reported inconsistently across sources, so a computed, consistent comparison is more trustworthy than repeating conflicting marketing numbers. Use them for relative size, not absolute spec-shopping.
Retail listings almost always label the Standard shape further by a size number — No.2 and No.6 are the two you'll see everywhere, on Target, Winmau, Harrows and Shot flights alike. Most of those manufacturers describe No.2 as the larger, higher-drag size and No.6 as a slightly smaller, faster variant that ships as the default with most dart sets — both are sizes of Standard, not separate silhouettes, and sit close to the Standard row above. Worth flagging: a couple of retailers reverse which number is bigger, so if a size label contradicts what's printed on your own packet, trust the packet over any single guide, including this one.
Bounding-rectangle figures, drawn to the same scale and aligned at the shaft — not the manufacturer's cut surface area, which is reported inconsistently across brands. Tap a shape, or let it cycle.
Combinations that behave differently than their parts suggest
A slim flight on a long shaft doesn't behave like a slim flight on a short shaft — the shaft length changes how much leverage that smaller surface has to work with. As a rough pairing: lighter barrels (18–22g) generally want more flight surface to stay stable; heavier barrels (23–26g+) can carry a smaller flight because their mass already resists the wobble a lighter dart needs the flight to correct. Most players landing on a stable setup end up at standard or kite flights on medium shafts, adjusting from there once they know which symptom — wobble, a high arc, or deflection — they're actually correcting for.
Points
Steel points come in two working forms: fixed , set permanently in the barrel, and moving (retractable), spring-mounted so the tip can give on impact. The distinction that matters is what that retraction actually does. It isn't a shock absorber quietly dissipating energy — the point yields just enough that the dart's own forward momentum keeps carrying it, sliding the tip past whatever it struck rather than transmitting the full impact straight back down the shaft.
That distinction matters most specifically where the point meets the board's wire , not the sisal generally. A rigid point striking a wire head-on has nowhere to go and rebounds; a moving point retracts, and the dart's own momentum sustains enough pressure on the wire to slide the tip off it and into the fibre alongside. Sharpness plays into the same problem from another angle: Winmau's own setup guidance warns that excessively sharp points can dig into wires and cause a bounce-out rather than deflecting into the fibre — a maintenance issue that overlaps with, but isn't solved by, switching to a moving point.
Fixed points remain the default and by far the more common setup, but there's no point at which a player is expected to graduate onto them — plenty of players stay on a moving point permanently, by choice, specifically because it cuts wire bounce-outs regardless of how consistent their throw is. Worth keeping separate: interchangeable point systems, like Target's Swiss Point, let a player unscrew and swap the point itself between throws with a small tool. That solves a different problem entirely — the point is fixed in place during flight and impact either way; only which physical point is screwed into the barrel changes.
Both panels show the same wire contact. The difference is what happens in the next few milliseconds: a rigid point has nowhere to go but back; a spring-mounted point yields, and the dart's own forward momentum — not the spring — carries the tip past the wire and into the sisal beside it.
Reading your own collision pattern
Which fix matters depends on where the contact actually happens. Barrel-on-barrel contact in the bed points to diameter — material, weight, or barrel length. Deflection off the shaft or flight of a dart already stuck in the board points the other way — flight size or shaft length. Most players who group tightly enough to have this problem at all see some of both, which is why the barrel and the rear-of-dart choices are worth tuning as a pair rather than separately.
Wear and replacement
Barrels wear slowest — tungsten holds its grip pattern for a long time, brass dulls faster since it's a softer metal. Flights are the first thing to fail: a torn or bent flight stops correcting the dart's flight properly, and the failure is often silent — the dart still flies, just not the way it did when the flight was new. Shafts crack at the threads under repeated impact, which is usually the first sign a setup needs attention.
Questions
Does a higher tungsten percentage always mean a slimmer barrel?
At the same weight and length, yes — but the gain shrinks as you go up. Brass to 80% tungsten is the largest jump; 90% to 95% is much smaller; length or weight changes can move the diameter more than a percentage upgrade does.
Is nickel-silver a step up from brass?
Barely. At 8.58–8.75 g/cm³ against brass's 8.50, the diameter difference at the same weight is negligible. It's a price and finish tier, not a performance one.
Do three darts actually fit in the treble bed?
The bed's radial depth is about 8mm, which most individual barrels clear. What limits stacking is the combined footprint of barrels plus the shaft and flight of a dart already in the board — a following barrel has to clear both.
Should I change weight or tungsten percentage to fix deflections?
They aren't interchangeable. Weight changes your whole throw; percentage changes only the diameter at a given weight. If barrel collisions are the problem, percentage or length is the direct lever.
What's a typical shaft length in millimetres?
There's no fixed standard — manufacturers measure differently, so a "medium" varies by brand. Categories are more reliable than specific millimetre figures across brands.
Is there a single correct dart weight?
No. Top-15 PDC professionals span 18g to 32g — Stephen Bunting at the light end, Ryan Searle at the heavy end — with the average sitting around 22-23g. Heavier favours a flatter trajectory and forgives release flaws; lighter rewards a consistent throw with more direct feedback. Neither is more correct, and the printed barrel weight always runs under the assembled dart's actual weight once shaft and flight are on.
What are No.2 and No.6 flights?
They're size labels for the Standard shape, not separate silhouettes — No.2 is usually the larger, higher-drag size and No.6 the slightly smaller, faster default that ships with most dart sets. A couple of retailers reverse which number is bigger, so if in doubt, trust what's printed on your own packet over any single guide.