Arbor Knot: How to Tie Fishing Line to Your Reel Spool

The arbor knot is the essential first connection every angler makes when spooling a fishing reel. Whether you’re rigging a fly reel with backing, loading monofilament onto a spinning reel, or preparing a bait casting reel for the season, this simple yet effective knot ensures your fishing line stays securely attached to the spool. Based on a noose knot design, it tightens under tension and provides a reliable foundation for all the line you’ll wind onto your reel.

What Is the Arbor Knot and When to Use It

The arbor knot consists of two overhand knots that work together to create a jam-style connection around the reel spool. The first overhand knot wraps around the standing end of your line, while a second overhand knot in the tag end acts as a stopper that prevents the first knot from loosening. When you pull the main line tight, the second knot jams against the first, creating a secure connection that tightens further as you wind line onto the spool.

This knot excels at attaching backing to fly reels, securing monofilament or fluorocarbon to spinning reels, and preparing bait casting reels for new line. It’s equally useful for tying off filler spools of fishing line for storage, eliminating the need for rubber bands or tape. The knot works best with lines that have some stretch, such as monofilament and fluorocarbon, which allow the connection to lock properly under tension. While it’s not designed to hold a trophy fish that has stripped all your line down to the spool, it provides sufficient strength to retrieve a rod and reel that’s gone overboard by pulling on the line. The arbor knot has limitations with non-stretch lines like braided line, where the lack of elasticity can cause slippage on highly polished reel spools.

How to Tie the Arbor Knot

Follow these step-by-step instructions to create a secure connection between your fishing line and reel spool:

1. Pass the line around the spool: From the front of your reel, wrap your fishing line completely around the arbor or spool center. Leave yourself 6-8 inches of tag end to work with, ensuring you have enough line to complete both overhand knots comfortably.
2. Tie the first overhand knot: Take the tag end and pass it under the standing end of the line. Bring it back over and through the loop you’ve created, forming a simple overhand knot around the main line. Don’t tighten this knot completely yet—leave it loose enough to slide along the line.
3. Create the stopper knot: Using just the tag end, tie a second overhand knot about 1-2 inches from the first knot. This stopper prevents the first knot from pulling through when you apply tension. Make this knot tight and snug.
4. Position the knots: Hold the spool steady and pull on the standing end of the line. The first overhand knot will slide down toward the spool, and the second overhand knot will travel along behind it until both knots meet and jam together.
5. Moisten before final tightening: Wet both knots with water or saliva to reduce friction heat that can weaken your line. This step is especially important with monofilament and fluorocarbon, which can be damaged by the heat generated during tightening.
6. Tighten and trim: Pull steadily on the standing end until both overhand knots seat firmly against the spool. The second knot should jam tightly against the first. Once secure, trim the tag end close to the stopper knot, leaving about 1/8 inch to prevent slippage.

An alternative method involves creating a noose first and dropping it over the spool, then pulling to tighten—just ensure you’re making a proper noose knot rather than a slip knot, which will simply pull undone.

Pro Tips for a Stronger Arbor Knot

• Add extra wraps for polished spools: On highly polished reel spools where slippage might occur, wrap the loop two or three times around the arbor before tying the first half hitch. These wraps should rotate in the same direction as your reel winds, so that turning the reel actually tightens the wraps rather than loosening them.
• Test the connection before spooling: After tying the knot, give the standing end a firm pull to ensure both overhand knots are properly seated and won’t slip. You should feel the line stretch slightly as the knot locks into place—this stretching action is what creates the jam.
• Consider line stretch requirements: The arbor knot relies on line stretch to lock properly. If you’re using low-stretch or no-stretch lines, consider alternative knots like the uni knot tied with just one or two wraps, which provides better grip without relying on elasticity.

Common Mistakes to Avoid

• Forgetting the stopper knot: The second overhand knot in the tag end is essential—without it, the first knot can loosen and slip when you apply tension. Some anglers mistakenly tie only the first overhand knot, which compromises the entire connection and can result in lost line.
• Tying a slip knot instead of a noose: If you’re using the drop-over method, ensure you’re creating a proper noose knot that tightens when pulled. A slip knot will simply pull apart, leaving your line unsecured to the spool.
• Over-tightening with excessive force: While you want a snug connection, pulling too hard can stretch the line beyond its elastic limit or create weak points. Pull steadily until you feel the line start to stretch, then release slightly—the knot should remain locked without constant extreme tension.

Best Line Types for the Arbor Knot

• Monofilament: This knot performs excellently with monofilament line due to its natural stretch and flexibility. The elasticity allows the jam mechanism to work as intended, creating a secure connection that tightens under load. Monofilament also grips the spool surface well, reducing the chance of the entire knot rotating around a smooth arbor.
• Fluorocarbon: Fluorocarbon works reliably with the arbor knot, though it requires extra attention to moistening before tightening. This line type generates more friction heat than monofilament, so proper lubrication is critical. The stiffer nature of fluorocarbon means you should ensure both overhand knots are fully seated before beginning to spool your reel.
• Braided Line: Braid presents challenges for this connection because it lacks the stretch necessary for the jam mechanism to lock effectively. If you must use the arbor knot with braided line, consider adding electrical tape or moleskin to the spool first to increase friction, or opt for a more suitable knot like the uni knot that doesn’t rely on line elasticity.

Arbor Knot vs Uni Knot for Reel Attachment

While the arbor knot remains the traditional choice for backing to reel connections, the uni knot offers an alternative worth considering. The uni knot, tied with just one or two wraps instead of the standard five or six used for tippet to fly connections, provides superior grip on braided line and works well across all line types. However, the arbor knot’s simplicity makes it easier for beginners to learn and remember. For monofilament and fluorocarbon on standard reel spools, the arbor knot provides perfectly adequate security. Reserve the uni knot for situations involving braid or when you need maximum holding power on slick spool surfaces.

Frequently Asked Questions

Master the Arbor Knot

The arbor knot remains an indispensable skill for every angler, from those pursuing largemouth bass to fly fishers chasing atlantic salmon and brook trout. Practice this connection a few times at home before you need it on the water, and you’ll be able to tie it quickly and confidently whenever you’re spooling a reel or organizing your filler spools. With proper technique and attention to line type, this simple knot provides the reliable foundation your fishing setup needs.