Offshore Swivel Knot

The Offshore Swivel Knot is a heavy-duty connection designed for big game fishing situations where failure is not an option. When you are hooked up to a marlin, tuna, or other powerful pelagic species hundreds of miles from shore, your terminal connections need to deliver near-full line strength under extreme and sustained pressure. This knot uses a doubled line, typically the end section created by a Bimini Twist or Spider Hitch, to attach a barrel swivel or crane swivel with remarkable security. At approximately 95% breaking strength, it ranks among the strongest terminal knots in any angler’s arsenal and is a standard in offshore fishing circles from the tournament fleets of the Atlantic to the charter boats of the Pacific.

How to Tie

1. Start with a doubled line, typically formed by a Bimini Twist or Spider Hitch. You need about 12 to 18 inches of doubled line to work with.
2. Pass the looped end of the doubled line through the eye of the swivel.
3. Fold the loop back over the swivel so that the swivel now sits inside the bight of the loop, held between the two strands.
4. Pinch the swivel and the two strands together, then rotate the swivel through the doubled line loop, spinning it a full rotation to create the first wrap.
5. Continue rotating the swivel through the loop, making five to seven complete rotations. Each rotation adds a wrap of doubled line around the standing strands above the swivel eye.
6. Moisten all the wraps generously with water to ensure smooth tightening and prevent heat buildup.
7. Hold the swivel firmly and pull the doubled standing line steadily to cinch the wraps tight. The wraps should stack neatly and compress against the swivel eye. No trimming is required since the doubled line remains intact.

When to Use

• When attaching a barrel swivel or crane swivel to a doubled main line for offshore trolling after big game species like marlin, tuna, wahoo, or sailfish.
• When building heavy tackle rigs that must withstand prolonged fights with powerful fish that generate hundreds of pounds of drag pressure.
• When connecting the main line to a wind-on leader system where the swivel serves as the junction between the double line and the leader.
• When tournament fishing where IGFA rules require specific knot and leader configurations and maximum knot strength is essential for landing qualifying fish.
• When fishing in situations where a failed connection means losing not just the fish but expensive lures, heavy leaders, and significant rigging time.

Pro Tips

• Always start with a properly tied Bimini Twist as your doubled line foundation. The Bimini retains nearly 100% line strength, so pairing it with the Offshore Swivel Knot gives you a connection system that approaches full line rating from the reel spool to the swivel.
• Five rotations are sufficient for monofilament up to 50-pound test. For heavier lines in the 80 to 130 pound class, increase to seven rotations to ensure the thicker, stiffer material grips securely and the wraps do not unravel under extreme tension.
• When rotating the swivel, maintain steady tension on the doubled line above to prevent the wraps from loosening or tangling. Loose wraps will cross over each other during tightening and create a weak, uneven knot that can fail during a long fight.
• Practice this knot at home with a swivel tied to a fixed post or door handle. Pulling against a stationary object lets you feel how much force is needed to properly seat the wraps and gives you confidence that the knot is performing as intended before you rely on it offshore.

Pros and Cons

Pros:

• Delivers approximately 95% line strength, making it one of the strongest terminal connections available for attaching swivels in any fishing application.
• Uses the doubled line to distribute stress across two strands, dramatically increasing resistance to abrasion during long fights with powerful fish.
• Straightforward to tie once the technique is understood, requiring only rotations of the swivel through the loop rather than complex thread-and-wrap movements.
• Widely trusted by professional offshore anglers, charter captains, and tournament teams who depend on their knots to hold under maximum drag pressure.

Cons:

• Requires a pre-formed doubled line section such as a Bimini Twist, adding an extra step and additional knot-tying skill before you can even begin the Offshore Swivel Knot.
• Designed specifically for swivels and is not applicable to tying directly to hooks, lures, or other terminal tackle.
• Overkill for light tackle or inshore fishing where simpler knots provide more than enough strength for the species being targeted.
• Difficult to tie neatly with very heavy monofilament above 100-pound test, as the stiff, thick line resists the rotations and can produce uneven wraps that reduce the knot’s theoretical strength.