The “550” in 550 paracord is its minimum breaking strength of 550 pounds-force, since 550 paracord is most commonly Type III nylon kernmantle cord with a braided sheath and 7 inner strands.
Pull a length of mil-spec cord until it snaps, and the load at that moment is what the label promises. That figure is a failure point, not a safe limit — mixing up the two is the mistake that breaks gear and injures people. Below is what the cord is made of, where the number comes from, and how much weight it can really hold.
What Does The 550 In 550 Paracord Actually Mean?
The number 550 refers to the cord’s minimum breaking strength of 550 pounds-force, not its safe working load. Type III is the version most people mean when they say “paracord,” and the military-style designation is where that strength figure comes from.
Paracord, also called 550 cord or parachute cord, began as the suspension line of a parachute, which had to hold a human body and canopy under a hard shock load. The naming convention stuck: “550” is a strength rating, not a length, color code, or model number. Three terms get used interchangeably and shouldn’t be:
- 550 paracord — the common name for the military-style Type III cord.
- Type III — the official-style category that the 550 rating belongs to.
- 550 lb — the minimum load at which the cord is expected to fail.
How 550 Paracord Is Built
Type III 550 paracord is a nylon kernmantle cord: a braided outer sheath wrapped around a core, usually 7 inner strands, with a diameter commonly listed at about 4 mm or 5/32 inch.
The sheath takes the abrasion and UV exposure, while the inner strands carry most of the load. Cut a length and you can pull those strands out individually — one cord becomes several thinner cords in a pinch. Spec details worth knowing before you buy:
- Minimum breaking strength: 550 lb for Type III.
- Stretch: military-style specs commonly cite 30% minimum elongation.
- Material: nylon, which absorbs some water and stretches, unlike static aramid or polyester cords.
That elongation is a feature in some uses and a problem in others. A tarp guyline that stretches 30% will sag overnight; a shock-absorbing application wants exactly that behavior.
What Is 550 Paracord’s Real Safe Working Load?
Breaking strength is not the same as safe working load, and 550 lb should never be treated as a weight the cord can routinely hold. For static use, published guidance puts safe working load far lower than the breaking point.
The 550 figure comes from a controlled pull, not a real-world setup where knots, wear, sun exposure, and shock loads cut the margin. A knot alone can knock a meaningful percentage off a cord’s strength, because the bend concentrates stress in one spot. General practice is to keep any load-bearing rig well under a fraction of the breaking strength, and to replace cord that has frayed, faded, or stiffened.
| Spec | Type III 550 Paracord | What It Means In Practice |
|---|---|---|
| Breaking strength | 550 lb minimum | Failure point, not a working limit |
| Safe working load | Far below 550 lb | Knocks, wear and shock cut the margin |
| Construction | Braided sheath, 7 inner strands | Strands can be pulled out for finer jobs |
| Diameter | About 4 mm / 5/32 in | Fits most standard cord locks and beads |
| Material | Nylon | Stretches, and absorbs some water |
| Elongation | 30% minimum | Great for shock load, poor for taut lines |
| Common names | 550 cord, parachute cord | Usually means the Type III version |
Where The Label Misleads Buyers
Not every cord sold as 550 paracord meets the military-style spec it borrows its name from, because “550” is often a marketing label rather than a certified rating. Type III is only one of several official-style cord types, even though it’s the consumer standard.
Buy from sellers who publish actual test data and state the type. If a listing leans on the number without saying Type III, treat the strength claim as unverified. Cord that fails early tends to fail at the sheath or at a knot, so inspect the weave before you trust the rating. If you want cord that holds up instead of just carrying the number, the tested 550 paracord picks worth buying are a reasonable starting point, and Wikipedia’s parachute cord reference lays out the type distinctions in more detail.
FAQs
Is 550 paracord strong enough to hold a person?
Not safely. The 550 lb figure is a minimum breaking strength — the point where the cord fails, not a load you can hang from with any margin. Knots, wear, and shock loads all reduce real capacity, so never treat this cord as a climbing or life-safety line.
Why is it called parachute cord?
Paracord started as the suspension line used on parachutes, where it had to hold a body and canopy under a hard shock load. The name carried over to the general-purpose utility cord sold today, even though most of it never touches a parachute.
What is the difference between Type III and other paracord types?
Type III is the category rated for 550 lb, which is why it’s the version most people mean. Other types carry different strength ratings and strand counts, so checking the type is the reliable way to know what you’re actually buying.
References & Sources
- Wikipedia. “Parachute cord.” Covers cord types, construction, and the origin of the 550 designation.
- Paracord Planet. “Cord Comparison Chart – Paracord Sizes.” Compares cord types and diameters across categories.
- Paracord Planet. “Paracord Strength, Sizes, and Types.” Explains breaking strength versus safe working load.