Nylon 12-Strand Rope - Miami Cordage


Manufactured by Miami Cordage, nylon 12-strand plait braid provides high strength, high elongation and excellent abrasion resistance in a single braid construction. The torque free braided construction provides easy handling and prevents kinks and hockles. Nylon 12-strand plait splices easily, with either a “tuck” splice or a “buried” splice.


  • 25% stronger than 3 or 8-strand nylon
  • Higher strength-to-weight ratios, high stretch and will not rotate under load
  • Stays supple over time in both marine and industrial environment
  • Grips and renders well on winches, bollards and capstans
  • White and black stocked colors
  • 16 colors available in solid color or custom designs, refer to our Custom Rope page
Part # Nominal Diameter Circ
Tensile Strength
Appx Wt/100 ft
Inch MM
E12N38 3/8 10 1-1/8 4,200 3.70
E12N716 7/16 11 1-1/4 6,000 4.90
E12N12 1/2 13 1-1/2 7,850 6.40
E12N916 9/16 14 1-3/4 9,730 8.10
E12N58 5/8 16 2 12,500 11.00
E12N34 3/4 19 2-1/4 17,200 14.40
E12N78 7/8 22 2-3/4 23,750 19.50
E12N1 1 25 3 30,100 25.40
E12N118 1-1/8 29 3-1/2 38,875 33.00
E12N114 1-1/4 32 3-3/4 45,400 39.50
E12N112 1-1/2 38 4-1/2 62,400 56.00
E12N158 1-5/8 41 5 73,300 67.00
E12N134 1-3/4 44 5-1/2 83,700 79.00
E12N2 2 50 6 106,000 100.00
E12N214 2-1/4 57 7 135,350 126.00
E12N212 2-1/2 64 7-1/2 164,675 155.00

Compliance to the above specifications is based upon testing according to the Cordage Institute Standard Testing Methods for Fiber Rope and/or ASTM D-4268 Standard Methods of Testing Fiber Ropes.

Weights: Are average and may vary +/- 5%.

Tensile strengths: Are approximate average for new, unused ropes. To estimate the minimum tensile strength of a new rope, reduce the approximate average by 15% (Cordage Institute defines minimum tensile strength as two standard deviations below the average tensile strength of the rope).

Nylon rope has three characteristics that make it ideal for dockline. Nylon rope is incredibly strong, it is very stretchy, and it resists the harmful effects of sunlight better than any of those fancy-name synthetics.

Nylon ropes value of strength is self-evident, but the benefits of elasticity may not be as obvious. When your boat surges against an unyielding dockline, the load on the line goes from zero to the maximum at the instant the nylon line comes taut. The likely consequence is a broken line-not unlike how you might snap a piece of thread with a jerk. Even if the nylon rope is strong enough not to break, it is hammering cleats and bitts with every surge. Nylon rope doesn’t come taut suddenly, but dissipates the load by stretching. It is like the difference between hitting the steering wheel or hitting the air bag.

As for nylon rope’s resistance to ultraviolet damage, docklines, particularly permanent docklines, live in the sun. Nylon lines enjoy a much longer life than other lines in that environment.