The Anchor Bend (Fisherman’s Bend): How to Tie Your Anchor Line and Sleep Easy

I’ve been tying knots on the Gulf Coast for twenty years, and if there’s one I trust above almost every other for securing an anchor line, it’s the anchor bend fisherman’s bend knot. It’s simple, reliable, and time-tested — the kind of knot that holds when a squall rolls in at 2 a.m. and you’re already asleep in the cabin. That peace of mind is worth everything out on the water.

A few summers back, a client called me in a panic. His 24-foot center console had broken loose from its mooring overnight and drifted into a neighboring slip, punching a gel coat gouge into a $40,000 boat. When I looked at the anchor line, the cause was obvious — he’d used a simple half hitch to attach the rode to his anchor ring. Half hitches work for quick, light jobs. They do not work for an overnight mooring in tidal current. One proper anchor bend would have saved him thousands of dollars and a very uncomfortable conversation with his neighbor.

That story is exactly why I wanted to write this guide. This knot is one of the most important in any boater’s or dock builder’s repertoire. Whether you’re anchoring a jon boat in a bayou or setting a working anchor off a 30-foot vessel, you need to know how to tie this correctly — and why it holds the way it does.

When to Use the Anchor Bend (Fisherman’s Bend) Knot

The anchor bend — also called the fisherman’s bend — is specifically designed for one job: attaching a rope to a ring, shackle, or anchor. That’s it. However, it does that one job better than almost any other knot you’ll reach for. The design uses two round turns through the ring before the hitches are applied. Those round turns distribute the load across a wider surface, which dramatically reduces the stress concentration on the rope at the attachment point.

In my experience, this knot is the right call in the following situations:

• Attaching an anchor rode directly to a plow, Danforth, or grapnel anchor ring
• Securing a mooring line to a mooring buoy ring
• Connecting a rope to a shackle on a dock or cleat when a splice isn’t practical
• Temporary or semi-permanent anchor setups where you need a knot you can still untie after a heavy load
• Any application where the rope will experience cyclic loading — tides pulling, wakes tugging, current shifting

Specifically, it shines with nylon rope — both three-strand and double-braid. Nylon’s elasticity under load works with this knot’s geometry rather than against it. As the load cycles, the round turns tighten down rather than working loose. That’s physics working in your favor.

When Not to Use This Knot

Being honest here matters to me. The anchor bend is not the right knot for every situation. Don’t use it on very stiff line — heavy three-strand over 5/8″ gets difficult to seat properly in the ring. It’s also not ideal for high-modulus synthetic lines like Dyneema or Spectra, where the slippery surface can cause the hitches to work free. For those materials, a splice is always the right answer. That said, for standard nylon dock and anchor line in the 3/8″ to 1/2″ range, this knot is nearly unbeatable.

Step-by-Step: How to Tie the Anchor Bend Fisherman’s Bend Knot

I’ve tied this knot thousands of times — on cold mornings with wet hands, in the dark, in the middle of weather. The fact that I can still do it reliably under pressure tells you something about its simplicity. Follow these steps carefully the first few times. After about ten repetitions, it becomes muscle memory.

1. Thread the working end through the ring — twice. Pass the working end of your rope through the anchor ring or shackle. Then pass it through again in the same direction, creating two full round turns. These turns should lie parallel and neat, not crossed. This is the most important step. Those two round turns are what separates this knot from a simple hitch and what gives it its holding power.
2. Pass the working end under both round turns. Bring the working end back toward the standing part and tuck it underneath both of the round turns you just created. Pull it snug but not fully tight yet. You’re essentially starting a half hitch that traps through the existing loops.
3. Tie a second half hitch around the standing part. Now bring the working end around the standing part and pass it back through the loop you just created — completing a standard half hitch. This second hitch locks the first one in place. Pull the standing part firmly to seat the knot against the ring.
4. Dress the knot carefully. Make sure both round turns are seated flat against the ring, not twisted or overlapping. The two half hitches should sit snugly against the back of the round turns. Slide everything down tight to the ring before applying load. A poorly dressed knot will look sloppy and may not hold at full capacity.
5. Secure the tail (optional but recommended). For any long-term application — overnight anchoring, mooring, or extended dock work — seize the tail to the standing part with a couple of half hitches or a small piece of whipping twine. This prevents the free end from working back through the hitches under sustained load. I never skip this step on a job I’m leaving unattended.

Pro tip: Always wet your nylon rope before cinching down the final knot. Nylon heats up significantly under friction when tightening. A dry knot can generate enough heat to weaken the fibers at the contact point — especially on lighter 3/8″ line. A quick dip in the water or a splash from your bait bucket solves this completely.

Common Mistakes That Cause This Knot to Fail

I learned this the hard way early in my career. I was helping a shrimper set a working anchor off Perdido Pass using 1/2″ three-strand nylon. I was in a hurry, made only one round turn through the ring instead of two, and tied the rest correctly. That anchor walked about 40 feet overnight. The boat held fine — she was big — but the lesson stuck. One round turn is not an anchor bend. It’s a sloppy hitch, and it will fail eventually.

The Most Common Errors I See

• Only one round turn through the ring. This is the single most common mistake. One turn makes a regular hitch. You need two turns for a true fisherman’s bend. There’s no shortcut here.
• Crossed round turns. If the two passes through the ring cross each other instead of lying parallel, the load distribution is compromised. The knot may hold at light loads but will distort under heavy strain.
• Skipping the second half hitch. One half hitch over the round turns is not a finished anchor bend. The second half hitch around the standing part is what locks everything together. Without it, sustained cyclic loading will slowly walk the knot open.
• Not dressing the knot before loading. If you just roughly form the knot and then immediately put it under tension, it seats itself in whatever shape it happens to be in. Take five seconds to dress it properly first. This directly affects its strength rating.
• Using the wrong rope for the ring size. A 1/2″ rope through a tiny shackle ring may not allow two clean round turns. Match your hardware. Standard ABYC guidelines suggest your anchor ring should be at least twice the diameter of your rope for proper knot geometry.

The Line That Finally Held My Anchor When Everything Else Chafed

You can tie the perfect anchor bend, but if your line is weak or frays under load, that knot is only half the battle. I learned this the hard way after a cheap three-strand line nearly cost me my boat during a spring blow.

What works

• Double-braid construction stands up to the friction and chafe that kills single-strand rope — the nylon weave flexes without splitting when your anchor line works back and forth on a rough cleat.
• Half-inch diameter hits the sweet spot: thick enough to hold an anchor bend without slipping, thin enough to coil and handle without your hands cramping on a full day of dock work.
• Twenty feet is the practical length for most single-point anchor setups on recreational boats — long enough to reach bottom with scope in 15–20 feet of water without hauling miles of excess line back aboard.

What doesn’t

• Nylon stretches under load, which is great for shock absorption but means you need to re-cinch and check your anchor bend after the first few hours of a blow — it won’t stay tight on its own.
• Sun exposure degrades nylon faster than other synthetics; store it out of direct UV when you’re not anchored, or you’ll watch it fade and weaken over a couple of seasons.

I went through two cheap lines and one terrifying night-time drag before I switched to this one and actually trusted the rig. Get the SEACHOICE Double-Braid Nylon Dock Line 1/2″ x 20′ (Model 40241) and tie your anchor bend to something that won’t let you down.

This post contains affiliate links. As an Amazon Associate, I earn from qualifying purchases at no extra cost to you.