HEAVY MARINE, USCG, USN, TOW HAWSERS & MOORING HAWSERS

The Best Custom Boat Lines, Custom Colored Ropes, & Special Assemblies made to Your Specifications

We custom assemble all types of Mooring Lines, Dock Lines, Anchor Lines, Hawsers, Towing Lines, Towing Hawsers, Towing Bridles, Winch Lines, and Recovery Tow Ropes using the best materials and methods the industry has to offer. All our lines are custom made-to-order per the customer’s specifications. Please consider the information below and utilize the worksheets to help specify your Towing Hawser. Working Load Considerations: For Ocean and Commercial Towing Applications the W.L. is preferred to be equal to the fully loaded weight of the towed vessel, but for large vessels, ships, and equipment this may not be practical and too expensive. For lighter duty applications, practicality, pleasure marine, lake applications, storage concerns, and or budgetary considerations the W.L. is often chosen to be 1/2, 1/3, or some other fraction of the fully loaded weight of the towed vessel. We encourage the owner to consult with the manufacturer, insurance company, engineer, and or other authorities of jurisdiction as to provide their recommendations and industry guidelines. The vessel manufacture may have to provide an engineered calculation as to what the W.L.L. should be for their specific vessel, ship, equipment, and under what circumstances (towing speed for example).

These rope materials can be used for mooring lines, dock lines, tow lines, anchor lines, and hawsers. Choose 3-strand, 8-strand plaited, 12-strand plaited, 12-strand braided with load bearing cores and braided cover, or double braid rope construction.

Heavy Duty Marine and INDUSTRIAL MOORING LINES, TOW LINES, DOCK LINES, ANCHOR LINES, & HAWSERS: AVAILABLE IN 3-STRAND, 8-STRAND, & 12-STRAND ROPE. DOUBLE BRAID ROPE ALSO AVAILABLE.

A. Choose your fiber material
B. Choose your length
C. Choose from these typical options:
1. 3 to 6 foot Soft Eye Splice
2. Chafe Protection "Covered Eye"
3. Heavy Duty Galvanized Thimbles
4. Heavy Duty Galvanized Shackles

We also offer high performance 12-Strand AmSteel®-Blue, Spectra, Blue Steel, Dyneema® and Plasma rope materials. All strong as steel cable.

For heavy duty marine mooring lines, towing lines, towing hawsers, dock lines, anchor lines, construction rope, oil field rope, offshore oil exploration rope, oil platform rope, mining rope, railroad rope, single point mooring hawsers, heavy lift applications, and heavy duty industrial rope applications use the following fiber materials:

Megaflex
Polypropylene
Power Plus
Poly-Dan Blue
Polyester
Spectra
Nylon
Dyneema®
AmSteel®-Blue

Conversion Factors and Information
1 inch = 25.4 mm
12 inches = 1 foot
1 foot = 304.8 mm
1 meter = 3.28 ft
Circumference of a Circle
Circular = PI x Diameter

Weight
1 Pound = 0.4536 kG
1 kG = 2.2046 lbs

Force
1 Newton = 0.2248 lbs
1 kN = 224.8 lbs

Standard Hawser Lengths & MBS/WLL
50 ft / 100 ft / 300 ft / 600 ft / 720 ft / 900 ft / Custom
Where 1 Fathom = 6 feet
Minimum Breaking Strength (MBS) to Working Load Limit (WLL)
WLL for Very Conservative = MBS/10
WLL for Standard Conservative = MBS/5 (Denver Rope Selection)
WLL for Less Conservative = MBS/3
WLL = Engineered Calculation

Click here to download our Diameter to Circumference Conversion Chart PDF

Click here to download our Inches to Millimeter Conversion Chart PDF

Denver Rope — Heavy Marine Hawser Rope — Mooring Line Diagrams — Customize each end of the line to include Hardware and Eye Splices single point mooring hawser

Single Point Mooring Hawsers, Mooring Hawsers, and Mooring Lines - Please consider that all of our Single Point Mooring Hawsers, Tow Hawsers, Mooring Hawsers, Tow Lines, and Mooring Lines are custom spliced-to-order with associated lead times. For faster turn-around times we do stock pre-spliced Poly-Dan Blue Mooring Line Coils—Ready to Ship. These lines are Polypropylene, 8-Strand, 720ft Overall Length, with a 6ft canvas covered eye splice on each end. These lines can also serve as a Tow Hawser or Mooring Hawser. Upon purchase of a coil, we can cut and re-splice the rope into separate lines, custom spliced-to-order.

Poly-Dan Blue Heavy Duty Mooring Line

Our large diameter 8-Strand Poly-Dan Blue Mooring Lines are made from high-strength polypro. A perfect mooring line for large vessel, these limes are 720’ in length with 6’ canvas covered eyes each end.

Manufactured by DSR in Korea in accordance with ISO 900:2008, Lloyd’s certified
Mill Test certificate provided with each line

Part#

Nominal Diameter

Inch	MM

Circ (in)

Tensile Strength (lb)

PPR8SD2720

67,200

PPR8SD214720

2-1/4

78,000

PPR8SD212720

2-1/2

7.5

91,500

PPR8SD258720

2-5/8

103,500

PPR8SD3720

135,000

PPR8SD314720

3-1/4

171,000

PPR8SD4720

100

243,000

Denver Rope — Towing Hawser Diagrams — Customize each end of the line to include Hardware and Eye Splices

Heavy Marine Hawser Rope Hardware & Hawser Rope Fittings - For information regarding Hawser Rope Hardware & Hawser Rope Fitting to include Towing Thimbles, Mooring Thimbles, Rope Couplings, Rope Connectors, Shackles, Thimbles and Links, please continue to our HEAVY MARINE HAWSER ROPE HARDWARE & HAWSER ROPE FITTINGS webpage for additional information for your consideration. [Continue to HEAVY MARINE HAWSER ROPE HARDWARE & HAWSER ROPE FITTINGS webpage]

Denver Rope — Single Point Mooring Hawser Diagrams — Customize each end of the line to include Hardware or Eye Splices

heavy duty bexco mooring line rope

Single Point Mooring Hawsers & Mooring Lines - Please continue to our SINGLE POINT MOORING HAWSERS & MOORING LINES webpage for additional information for your consideration. [Continue to SINGLE POINT MOORING HAWSERS & MOORING LINES webpage]

Denver Rope — Towing Hawser Arrangement Diagram custom heavy duty towing hawser

Denver Rope — Towing Bridle Assembly Example Diagram custom tow bridle assembly

Denver Rope — Towing Bridle Assembly Example Diagram

custom heavy duty tow bracket

Click here to download our Custom Towing Hawser Worksheet PDF

Click here to download excerpt from Naval Ships Technical Manual - Towing Guidelines and Procedures PDF

Click here to download excerpt from Naval Ships Technical Manual - Towing Set Up and Equipment PDF

2-1/2” x 600 ft 3-strand nylon mooring line spliced with a heavy duty galvanized thimble. Again notice the additional whipping used to keep the rope seated against the thimble. Large diameter lines are our specialty.

We carry a wide selection of very large shackles for heavy marine or industrial application.

Picture of a Heavy Duty, Galvanized, Reinforced, Thimble & Link Assembly, spliced to 3-0” diameter White Double Braid Nylon. The Customer specified a Thimble & Link on each end of the 100ft Tow Line Assembly. Use a Bolted Shackle or a Detachable Link to make connections to the Link. The Heavy Duty Thimble & Link can be considered a Commercial Grade alternative to a NAVSEA Towing Coupling or a NAVSEA Towing Thimble.

The same 3-1/4” White Double Braid Nylon Dock Line / Mooring
Line with a 6-0’ Canvas Covered Eye Splice. We custom assemble
all types of Mooring Lines, Dock Lines, Anchor Lines, Hawsers,
Tow Lines, Tow Hawsers, Tow Bridles, Winch Lines, and Recovery
Tow Ropes using the best materials and methods the industry has
to offer. All our lines are custom made-to-order per the cus-
tomer’s specifications.

Pictured above is a Tug Boat Winch where the large diameter 8-strand rope is spliced to a Newco style hawser thimble. Two smaller diameter 3-strand polypropylene bow bridle legs are spliced directly to the Newco thimble.

Pictured above is a NAVSEA Rope Coupling Thimble for 10” circular (3-1/4” diameter) double braid nylon rope. The bolted retaining pin holds a
NATO Link / Master Link / Detachable Link for connection to another tow hawser (towing thimble) or a bolted shackle / hardware. The
approximate length of the towing thimble is 20” and the NATO Link is 24”

Pictured above is a typical method of securing a Tow Hawser to the Ship. From left to right: Towing Pad Eye, Bolted Shackle, Pelican
Hook Assembly, End Link, Detachable Link and a NAVSEA Towing Thimble spliced to 10” circular double braid nylon rope. Depending on your
ship’s arrangement and engineering preferences the above hardware connecting methodology can be revised and substituted with
commercially available equipment and hardware.

Pictured above is the other end of the Tow Hawser. Another Tow Hawser can be connected to the Nato Link. From left to right: NATO
Link, Detachable Link, and a NAVSEA Towing Thimble spliced to 10” circular double braid nylon rope. Depending on your ship’s arrangement and
engineering preferences the above hardware connecting methodology can be revised and substituted with commercially available
equipment and hardware.

Pictured above are two NAVSEA Rope Couplings sized for 3-1/4” Diameter Double Braid Rope to be used as a Tow Line / Tow Hawser Line. In this case the USN ship sent their existing rope couplings to be re-used spliced to our new double braid nylon rope. The overall
length of the completed tow line = 600ft continuous. Use a NATO Link or Detachable Link to connect the rope coupling to another tow line using the bolted connections.

Performing the splices on large diameter lines is often a two man job. To secure the bury of the splice we whip the circumference of the rope at the throat of the splice down the line several inches.