ISO 16841:2014

Overview - ISO 16841:2014 (Steel wire ropes - Pulling eyes for rope installation)

ISO 16841:2014 defines types and minimum requirements for pulling eyes (also called beckets) prepared at or attached to the end of steel wire ropes to facilitate rope installation or re-reeving. The standard covers geometry, strength, working load limit (WLL), type testing, durability and the information manufacturers must provide. It applies to pulling eyes on steel wire ropes that conform to ISO 2408 and ISO 10425 and excludes ropes with fibre cores and separate end‑fittings such as wire rope stockings.

Key topics and technical requirements

• Pulling eye types: flexible (centre strand or steel core, with or without pressed ferrules), rigid (welded pad‑eye, modified eyebolt, chain link) and semi‑rigid terminations.
• Geometry requirements:
  • Flexible (centre strand): internal eye length ≥ 3 × rope diameter.
  • Flexible (steel core or ferrule secured): internal eye length ≥ 5 × rope diameter.
  • Rigid components: base diameter permitting a continuous fillet weld; overall pad/eye dimensions not greater than rope diameter.
• Strength and testing:
  • Manufacturers must determine and certify the minimum breaking force (F_p.e.min) and ensure test results meet or exceed this value.
  • Sampling rules for type testing: select representative diameters (upper/lower quartiles) or test each diameter where designs don’t follow a mathematical progression; rigid types require testing for every diameter.
• Durability: pulling eyes intended for multiple re‑reeving must withstand at least 1 000 cycles between loads of 25% and 125% of the specified WLL.
• Welding & qualification: welded rigid attachments must be applied by a qualified welder; re‑qualification not required if ≥3 component welds are made in any 12‑month period.
• Manufacturer information: marking, certificates (including WLL and minimum breaking force) and manufacturing/inspection instructions are required.

Practical applications and users

ISO 16841:2014 is relevant for:

• Wire rope manufacturers and rope‑end fabricators - to design, produce and certify compliant pulling eyes.
• Rigging, lifting and installation contractors - to select correct pulling eye types and safe line pulls for installation and re‑reeving operations.
• Offshore, petroleum, mining, crane and winch operators - where safe rope installation and re‑reeving are critical.
• Inspection and maintenance personnel - to verify markings, certificates and conformity to WLL and durability requirements.

Using ISO 16841 helps reduce installation risks by standardizing pulling eye geometry, strength and testing, ensuring safer rope handling and predictable performance during installation.

Related standards

• ISO 2408 - Steel wire ropes for general purposes (minimum requirements)
• ISO 10425 - Steel wire ropes for the petroleum and natural gas industries
• ISO 17893 - Steel wire ropes - Vocabulary, designation and classification
• ISO 7500-1 - Verification of tension/compression testing machines

Keywords: ISO 16841:2014, steel wire ropes, pulling eyes, rope installation, re-reeving, working load limit, minimum breaking force, pulling eye durability.