Technical Data

Strength / Weight
Normal Size Weight /
Diameter Circ
1/4″ 3/4″ 2.0 4,600
5/16″ 1″ 3.2 7,400
3/8″ 1-1/8″ 4.2 9,500
7/16″ 1-1/4″ 5.2 12,500
1/2″ 1-1/2″ 7.5 16,900
9/16″ 1-3/4″ 9.0 21,000
5/8″ 2″ 11.1 27,000
3/4″ 2-1/4″ 15.7 37,000
13/16″ 2-1/2″ 18.5 43,000
7/8″ 2-3/4″ 19.9 51,500
1″ 3″ 26.0 63,500
1-1/8″ 3-1/2″ 35.3 77,000
1-1/4″ 3-3/4″ 40.6 85,000
1-5/16″ 4″ 46.3 98,000
1-1/2″ 4-1/2″ 58.5 115,000
1-5/8″ 5″ 72.3 145,000
1-3/4″ 5-1/2″ 87.4 168,000
2″ 6″ 104.0 192,000
2-1/8″ 6-1/2″ 122.1 222,000
2-1/4″ 7″ 141.6 258,000
2-1/2″ 7-1/2″ 162.5 285,000
2-5/8″ 8″ 184.9 317,000

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).

Very little degradation from UV. Can be used outside over long term if inspected regularly.

Good resistance to most minerals/organics, acids and weak alkalis. Excellent resistance to bleaches and other oxidizing agents and to most solvents.

Polyester’s melting point is 480°F, progressive strength loss above 300°F. Spectra’s ® melting point is 300°F, progressive strength loss above 150°F.

Polyester and the Spectra® Core fiber have good resistance to passage of electrical current. However, in rope form, dirt, surface contaminants, water entrapment and the like can significantly affect dielectric properties. Extreme caution should be exercised any time a rope is used in proximity to live circuits.

Recommended D/d ratio is 8:1.

Working Loads:
No blanket working load recommendation can be made because it depends on the application and conditions of use, especially potential danger to personnel. It is recommended that the user establish working loads and safety factors based on professional and experienced assessments of risks.

The working load is a guideline for the use of a rope in good condition for non-critical applications and should be reduced where life, limb, or valuable property are involved, or for exceptional service such as shock, sustained loading, severe vibration, etc. The Cordage Institute specifies that the Safe Working Load of a rope shall be determined by dividing the Minimum Tensile Strength by the Safety Factor. Safety factors range from 5 to 12 for non-critical uses.

New England Ropes has developed special urethane coating techniques that can greatly improve rope performance. Coatings can be flexible or rigid. They can provide extra protection against abrasion, and provide color coding, and size and phase identification. Coating can be over a continuous length or applied to selected areas.

Quality Assurance:
Double Braided Spect-Set Ropes are made to rigid strength and weight standards. They are guaranteed to be free of manufacturing defects. Sample lots are continually tested in the company’s laboratory, and Certificates of Compliance are available on request.

Special Services:
New England Ropes can design constructions to meet specific requirements by engineering special rope geometry. In addition, fabricated units can be provided including thimbles, splices, integral chafe sleeves, etc. Contact Customer Service.

Fabrication Services:
Fabricated units can be provided including splices, thimbles, integral chafe sleeves, etc. Contact Customer Service for details.

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