Jig · Sizes #10-18
The Fario FR400 is a barbed jig hook available in sizes #10-18. It's built around a standard shank, which matches the proportions of most classic dry fly and nymph recipes — if a pattern doesn't specify a shank length, this is what it assumes, paired with standard wire — a balance of strength and weight that works across most freshwater applications. Tyers reach for it most often when working on jig nymphs, euro nymphs, perdigons. The sections below break down what each specification actually means at the vice, which patterns suit it, and which hooks from other manufacturers you can substitute when it's out of stock.
Shank length (Std.). This hook has a standard shank, which matches the proportions of most classic dry fly and nymph recipes — if a pattern doesn't specify a shank length, this is what it assumes.
Wire strength (Std.). It's made from standard wire — a balance of strength and weight that works across most freshwater applications.
Bend and gape (Std.). The FR400 uses a standard gape, which keeps the fly's proportions traditional.
Eye type (Down). It's finished with a down eye, the traditional choice, which sets a good hooking angle for dry and wet flies fished on a tippet.
Barbed. This is a barbed hook. Many competition rules and an increasing number of catch-and-release fisheries require barbless, so check local regulations — the barb can be pinched down with flat-jawed pliers before you dress the hook.
The Fario FR400 is tagged in the Woolly Bug database for jig nymphs, euro nymphs, perdigons. Patterns that sit naturally on this hook include Jig Perdigon, Jig Hare's Ear, Perdigon, Frenchie, Walt's Worm, Quill Perdigon. Because the hook's proportions drive the finished fly's silhouette, it's worth matching the pattern's intended shape to the shank rather than forcing a recipe onto the wrong blank.
The FR400 runs from size 10 through 18. The smaller end of the range (down to size 18) covers midge and small mayfly work, where fine tying thread and sparse dressings matter more than bulk. If you're buying this hook for the first time, the mid-range sizes see the most use at the vice, and tracking exactly which sizes you own is where an inventory app earns its keep — it's the detail most tyers forget at the fly shop counter.
These hooks match closely on the specifications that determine a fly's proportions and behaviour, so they work as substitutes.
If the Fario FR400 is out of stock, the closest match in the database is the Ahrex FW500 Black. When substituting, the specifications that matter most are gape and shank length — these determine whether the finished fly keeps its intended proportions. Wire strength is the next consideration, since it changes how the fly sits in the water: a heavier wire will sink a pattern that was designed to float. Eye type is usually the most forgiving difference, though switching to or from a jig eye changes how the hook rides entirely.
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Download FreeThe Fario FR400 is a jig hook used for Jig Nymphs, Euro Nymphs, Perdigons. It's available in sizes #10-18 with a Std. shank and Std. wire.
The closest equivalents are: Ahrex FW500 Black, Ahrex FW580 Black, Fulling Mill FM-5160 Black, Mustad R50, Mustad R50XAP. These match on the specifications that matter most — shank length (Std.), wire strength (Std.) and bend (Std.).
The Fario FR400 is barbed. Barbed hooks can be pinched down with pliers where barbless is required by competition rules or fishery regulations.
It's available in sizes #10-18.
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