Dry Fly Traditional · Sizes #8-18
The Ahrex FW501 Black is a barbless dry fly traditional hook available in sizes #8-18. It's built around a shank one size shorter than standard, giving a compact profile that suits short-bodied naturals like midges, buzzers and small emergers, 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 dry fly, cdc, mayflies. 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 (1XS). This hook has a shank one size shorter than standard, giving a compact profile that suits short-bodied naturals like midges, buzzers and small emergers.
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 FW501 Black uses a standard gape, which keeps the fly's proportions traditional.
Eye type (Up). It's finished with an up eye, a classic on wet flies and short-shank patterns where it opens up the effective gape.
Barbless. This hook is barbless from the factory, so it's ready for competition use and catch-and-release waters, and it does noticeably less damage to fish. Keep a steady line tension when playing a fish, as barbless hooks drop out more readily on slack.
The Ahrex FW501 Black is tagged in the Woolly Bug database for dry fly, cdc, mayflies, caddis. Patterns that sit naturally on this hook include Adams, Parachute Adams, Royal Wulff, CDC Dun, CDC Emerger, CDC & Elk. 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 FW501 Black runs from size 8 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 Ahrex FW501 Black is out of stock, the closest match in the database is the Ahrex FW502 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.
Log every hook, material and pattern on your bench — free on the App Store.
Download FreeThe Ahrex FW501 Black is a dry fly traditional hook used for Dry Fly, CDC, Mayflies, Caddis. It's available in sizes #8-18 with a 1XS shank and Std. wire.
The closest equivalents are: Ahrex FW502 Black, Ahrex FW503 Black. These match on the specifications that matter most — shank length (1XS), wire strength (Std.) and bend (Std.).
The Ahrex FW501 Black is barbless. That makes it suitable for competition use and catch-and-release fisheries without modification.
It's available in sizes #8-18.
Woolly Bug