Swivels are sized on a scale that runs backwards, then into aughts, which is why it is easy to buy the wrong one. This chart puts every common size next to its breaking strain and the rig it is actually for.
These are the plain, cheap swivels most anglers use for freshwater. The number gets smaller as the swivel gets bigger, and then the scale flips into aughts: 1/0 is larger than a size 1.
| Size | Breaking strain (lb) | Best for | Line it belongs on |
|---|---|---|---|
| #12 | 8 | Panfish, small trout, ice fishing | 2–4 lb |
| #10 | 12 | Trout, crappie, light walleye rigs | 4–6 lb |
| #8 | 18 | General freshwater, live bait rigs | 6–8 lb |
| #6 | 26 | Bass, walleye, catfish, light inshore | 8–12 lb |
| #4 | 35 | Big catfish, pike, inshore | 12–17 lb |
| #2 | 50 | Stripers, nearshore, light trolling | 17–20 lb |
| #1 | 60 | Heavy freshwater, light saltwater | 20–25 lb |
| 1/0 | 80 | Salmon, big catfish, surf leaders | 25–30 lb |
| 2/0 | 100 | Offshore trolling, big stripers | 30–40 lb |
| 3/0 | 125 | Offshore, tuna and mahi leaders | 40–50 lb |
| 4/0 | 155 | Heavy offshore, shark leaders | 50–80 lb |
| 5/0 | 200 | Big game, wire leader connections | 80 lb and up |
Breaking strains vary between brands by ten or fifteen percent, so treat these as bands rather than exact figures. When you are choosing between two sizes, the smaller one is nearly always the better pick: a swivel that is too heavy changes how a lure swims.
A ball bearing swivel uses a set of bearings inside the body instead of a plain metal-on-metal contact. It costs several times more and it matters for one reason: it keeps turning under load, where a barrel swivel tends to bind.
| Size | Breaking strain (lb) | Where it earns its cost |
|---|---|---|
| #8 | 20 | Steelhead and salmon drift fishing, spinner rigs |
| #6 | 30 | Trolling for walleye and trout, planner boards |
| #4 | 45 | Downriggers, leadcore, trolling spoons |
| #2 | 60 | Stripers, lake trout, dipsey divers |
| 1/0 | 90 | Salmon trolling, deep water jigging |
| 2/0 | 115 | Offshore trolling, tuna feathers |
| 3/0 | 140 | Big game trolling |
| 4/0 | 175 | Heavy offshore, wind-on leaders |
The rule of thumb: if a lure spins, a bait swims, or a fish makes long fast runs, a ball bearing swivel is worth it. If you are holding a bait still on the bottom, a barrel swivel does the same job for a tenth of the price.
A snap swivel combines a swivel with a clip so you can change lures without retying. It is a genuine convenience and a genuine weak point, because the snap is usually the first thing to fail.
| Style | Strength | Use it for | Avoid it for |
|---|---|---|---|
| Interlock snap | Lowest of the three | Quick lure changes in freshwater | Anything that might pull hard |
| Snap swivel | Moderate | Spoons and spinners, live bait rigs | Finesse presentations, wary fish |
| Coastlock snap | Highest | Offshore, big lures, wire leaders | Small lures, it is too bulky |
| Duo lock snap | Moderate | Bass, walleye, crankbaits | Heavy cover where it can open |
If you want the convenience without the weak point, tie direct and carry a pair of line clippers. The thirty seconds you save per lure change is not worth a lost fish.
On finesse presentations. A swivel in front of a small soft plastic or a drop shot is visible, and it changes the fall. Tie direct.
When the swivel can reach the fish. Anything a toothy fish can get its mouth around needs a short wire or heavy fluorocarbon leader instead of a swivel near the hook.
When you are using a lure that does not spin. A spinner or a spoon puts line twist in; a crankbait does not. If there is no twist to remove, the swivel is only adding hardware to the end of your line.
When it is the weakest link. A cheap snap rated below your line will open before the line breaks. That is backwards: the swivel should always be stronger than what it is attached to.
Three types cover almost everything, and a bulk pack of the small ones is the cheapest tackle you will ever buy.
A box of mixed sizes from #10 up to 1/0. The single most useful swivel purchase, because the right size costs pennies and the wrong size costs fish.
Check current price on Amazon →For anything that spins or trolls. Buy them in the two sizes you use most rather than an assortment, since the good ones are not cheap.
Check current price on Amazon →The strongest quick-change clip made. Worth it once you are fishing lures big enough to need it.
Check current price on Amazon →The standard bass and walleye clip. Small enough not to spoil a presentation, strong enough for a crankbait.
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Swivel size has to match line class, not fish size. The split shot sizes chart covers the weights that hang off it, the sinker weight converter converts the markings, and the leader size chart sets the line it joins.
A size 6 or 8 barrel swivel for most bass rigs, or a duo lock snap if you want to change lures without retying. Both are rated well above the 10 to 15 lb line you will be using, which is what matters.
No. A crankbait does not spin, so there is no line twist to remove. Tie direct with a loop knot and the bait will have a better action, plus one less thing to fail.
The 1/0 is larger. The numbered scale counts down as the swivel gets bigger, then flips into aughts where 1/0 is next up from a size 1, 2/0 is larger still, and so on. It is the same system as hook sizes.
For trolling, for spinners and for any fish that makes long fast runs, yes. A barrel swivel binds under load and lets the line twist. For still fishing on the bottom, a barrel swivel does the job for much less.
At the top of the leader, joining the main line to the leader, with the leader itself tied to the hook or lure. The swivel should be the strongest part of the connection, never the weakest.
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Estimates only: the values shown are a starting point, not a guarantee. Products of the same stated size differ between makers, so your own result will vary. TackleCalc is not affiliated with any manufacturer, and these figures are a guide rather than a guarantee.