O’Shaughnessy (roughly pronounced oh-SHAW-nuh-see) is a traditional hook style. It refers to a specific set of bends and overall proportions, not a model number from any single manufacturer. Like Aberdeen and Limerick, it is a historical name that has stuck around. The common look is a forged, heavy-wire hook with a bend similar to a Sproat, a relatively wide gap, and a point that is usually non-offset, mostly featuring a ringed eye. It is said to have originated as an Irish salmon hook, but today it is a veteran bait hook among saltwater anglers; jig hooks, fly hooks, and some soft plastic lure hooks also use this bend. Daiichi’s product descriptions note that this design has been handed down since the era of handmade hooks and has changed very little.
Its spelling online is all over the place—O’Shaugnessy, O’Saughnessy, and Oshaughnessy are all common. When searching or asking suppliers, try a few different variations.
Where the name comes from
The name comes from Limerick, Ireland. In the 1866 book Limerick; its History and Antiquities by Maurice Lenihan, it mentions that local fish hooks were once world-famous, and it was said that every single one was worth a salmon. About sixty years prior, Daniel O’Shaughnessy was one of the most famous hook makers of his time. After his son John died without heirs, Robert O’Shaughnessy hired craftsmen to keep the trade going. Later, the Selles family took over, and by 1866, only one man was left doing it: Michael Selles.
The book also recorded the process. The raw material was cast steel. Rural nail makers would put the steel into a peat fire and heat it to the right temperature—not too hot—and hammer it into blanks before handing it over to the hook makers. While the steel was still soft, the hook maker would hammer the hook shape directly out of the solid blank, and finally temper it. Later, cheap British knock-offs practically crushed the business.
As for how this specific bend was designed, there are different accounts. A text from 1865 wrote that O’Shaughnessy was figuring out how to hook and hold a salmon in the River Shannon, and which hook shape was most suitable. Many modern commercial materials tell another version; Eagle Claw’s description says it was named after an Irish fisherman and inventor, Captain J. O’Shaughnessy. The two accounts don’t match, and I couldn’t find original records that reconcile them, so we’ll leave it at that for this section.
Early hooks were often named after their inventors or places of origin, and many names carried on—Aberdeen, Kirby, Limerick, and O’Shaughnessy all came about this way. Once a name becomes a style, nobody really owns it anymore. Anglers in forums note that the shapes of these styles vary by manufacturer. Even if they are all labeled O’Shaughnessy, the curvature, gap, and point treatment aren’t exactly the same across brands.
How to recognize it
The bend is the core. Sproat is a parabolic bend with a straight point; Limerick is a semi-circular parabolic bend; Kirby is similar to Sproat but with an offset point; Carlisle is a round bend with an extra-long shank. O’Shaughnessy looks like a Sproat, but the difference is that the point is slightly turned inward. The gap is generally wide; Daiichi’s description explicitly says “wide gape.” Eagle Claw describes it as looking like a standard J-hook from the shank down, but with a sharper curve toward the throat, providing a larger effective hooking area.
There is some variation in the point among different brands. Eagle Claw’s 90-degree jig hooks are specified as non-offset straight points, while Mustad’s spec sheets list them as inline, meaning the point and the eye are on the same line. Some materials say it’s turned inward, while some manufacturers label it as a straight point—don’t just assume before buying.
Forging and wire gauge are the second defining feature. Forging means hammering a section of the shank and the bend flat, creating a shape that is flat on both sides. Eagle Claw’s claim is that a forged shank increases strength without needing to increase the wire gauge. The wire is usually on the heavier side; Mustad’s 3407 series is rated 2X strong, and the 9174 is 1X strong. To give you an idea of scale: the 14/0 in the 3407 has a wire diameter of about 4.45mm, a gap of about 49mm, and an overall length of about 141mm; the Eagle Claw 410 jig hook size 4 is about 0.038 inches (0.97mm), and the 5/0 is about 0.062 inches (1.6mm). Not all O’Shaughnessy hooks are heavy, though—BKK’s O’Shaughnessy-R uses a standard wire gauge and can be used in both fresh and saltwater.
Eye types and shank lengths vary a lot. For eye types, the Mustad family includes ringed eyes, large ringed eyes, open soft eyes, needle eyes, and down-turned eyes. Fly fishing mostly uses straight eyes. For shank length, the 9174 is 3X short, Daiichi’s Alpha Predator is 2X short, and there is also a 2X long version with a twisted shank, the 34015D. So the name only tells you the style of the bend; you have to look elsewhere for shank length, wire gauge, and eye type.
Let’s distinguish it from its close relatives. Siwash is also a common J-hook, but it has a longer point and a shorter shank. One of the selling points of the traditional Aberdeen thin-wire hook is that after getting hung up, you can bend it straight and bend it back to keep using it. O’Shaughnessy goes in the opposite direction: heavy wire and forging are meant to stand up to big fish and heavy loads, not to be bent straight and reused.
Mustad’s main models in this family
Mustad’s catalog breaks this family down very finely. Here are a few main ones so you can compare against other brands:
- 3407 / 34007: Forged, ringed eye. Positioned for long strip baits (whole fish heads and tails, squid, crab), suitable for both inshore and offshore, trolling and bottom fishing. The 3407 comes in Duratin and black nickel coatings, while the 34007 is the stainless steel version. Some retailers describe the 3407DT as a tinned, budget-friendly version of the 34007, but it is not as durable as stainless.
- 34081: Large ringed eye, Duratin coating, sizes up to 12/0. The official usage is for live baits like sardines, rigged as single, double, or triple hooks, trolled or drifted, targeting king mackerel, bluefish, wahoo, and barracuda. Rigging recommends heavy monofilament wire or fluorocarbon.
- 34091: Open soft eye version, Duratin coating, sizes 3/0 to 8/0.
- 3412C: Forged, 2X strong, short shank, needle eye, Duratin coating, sizes 7/0 to 10/0.
- 9174: 3X short shank, forged 1X strong wire, ringed eye. Officially said to be suitable for heavy bottom fishing, targeting king salmon, dorado, conger eel, ling, rays, and some smaller deep-water fish.
- Baitholder version with a cut shank: Features cuts and barbs on the shank to keep bait from sliding down. Officially called a time-tested all-around hook, it works from sea bass, mahi mahi, cod, and bluefish to striped bass.
- 3565: O’Shaughnessy bend treble hook, 2X strong, bronze finish.
Where it is used
Bait fishing is its home turf; the uses of the models above are basically all in this area. Another article lists its common uses as saltwater trolling, striped bass, and catfish.
Jig hooks are its second stronghold. Eagle Claw’s 60-degree O’Shaughnessy jig hooks sell on their heavy wire and forged shank, aimed at saltwater anglers who pour their own lead, used for swim jigs and other styles that require a vertical line tie. “Vertical line tie” means the hook shank is bent at an angle in front of the eye, so that when the lead is poured, the line tie sits at the top. The 90-degree version is also used for pouring lead, used for bass, walleye, crappie, and inshore saltwater. Mustad’s 91715D is also a 90-degree O’Shaughnessy jig hook.
In lure fishing, some anglers say that O’Shaughnessy and Sproat bends used to be common on spinnerbaits and buzzbaits, but were later replaced by larger round bends. After the Neko rig became popular, many manufacturers mass-produced shorter straight-shank hooks using the O’Shaughnessy bend, with the better ones featuring a weed guard, allowing them to be fished close to cover. Worm hooks for soft plastics are not its strong suit: the point is not offset, the gap is standard, and the point can’t be hidden in the soft plastic. Texas rigs generally still use offset hooks or EWG. Some anglers also feel that worm hooks with this bend are better suited for live bait.
In fly fishing, Daiichi 2451 is a black, forged, heavy-wire, straight-eye O’Shaughnessy bend, used for deep-sinking flies for salmon and steelhead. The Alpha Predator is 2X wire, 2X short shank, and black nickel coated, listed for tarpon, salmon, pike, musky, bass, and tube flies.
Pros and cons
Pros: Some anglers’ experience is that once an O’Shaughnessy bend hooks a fish, they rarely come off. This is personal experience, not a test conclusion; the manufacturer’s claim is that this bend provides a larger hooking area. Another advantage is the variety: the combinations of eye, shank, wire, coating, and material are comprehensive. Eagle Claw, Mustad, Daiichi, and BKK all offer products with this bend, from fly fishing to heavy offshore applications.
Cons: There are two main ones. First, the wire is thick, which creates more resistance when penetrating flesh. The same angler feels that large sizes of this bend hinder hooksets, and won’t use it above 2/0, while smaller sizes penetrate more easily. Therefore, point quality is even more important for this hook than for thin-wire hooks.
The second is that it is a J-hook. When paired with natural baits, the risk of gut-hooking a fish is higher than with circle hooks, and some fisheries require circle hooks outright. As mentioned earlier regarding saltwater hooks, since June 2008, U.S. federal waters in the Gulf of Mexico require the use of non-stainless circle hooks when fishing for reef species with natural baits. Under these regulations, J-hooks like O’Shaughnessy, whether stainless or tinned, are not allowed for these fish with natural bait. Rules vary by location and change over time; check the current regulations for wherever you are selling to.
What to look for when buying hooks
There is a counterintuitive thing about hook sizes: below size 1, the larger the number, the smaller the hook (size 4 is smaller than size 1); above 1/0, the larger the number, the larger the hook (8/0 is bigger than 2/0). The X system borrows the dimensions of adjacent sizes: 2X strong means the wire gauge is calculated as two sizes larger, and 3X short means the shank length is calculated as three sizes shorter. These rules do not have a unified standard in the industry; the actual size of the same number can vary between manufacturers.
When negotiating with suppliers, don’t just go by the name—ask for a dimensional drawing that includes at least the gap, overall length, wire diameter, eye type, point configuration (non-offset or slightly turned inward), and the extent of the forging. The logic for choosing coatings and materials is the same as in the previous article on saltwater hooks; tin, black nickel, stainless steel, and bronze each have their uses. If a forged high-strength hook is electroplated, ask for the record of the hydrogen de-embrittlement baking process. If you’re making jigs, decide on 60-degree or 90-degree first, then look at the wire gauge and where the lead head sits on the shank.
Post time: Nov-12-2026