Overview
ISO 2262:1984 - General Purpose Thimbles for Use with Steel Wire Ropes - Specification is an international standard developed by ISO, replacing its predecessor ISO 2262:1972. The standard specifies requirements for general purpose thimbles designed for use with steel wire ropes that comply with ISO 2408, with a maximum tensile grade of 1770 MPa and diameters ranging from 4 to 60 mm. This standard does not cover thimbles intended for fibre ropes, reeving thimbles, or solid thimbles.
ISO 2262:1984 provides globally recognized specifications to ensure the quality, safety, and interoperability of thimbles used in various lifting and rigging applications. By adhering to this standard, manufacturers and end-users can ensure compatibility and reliable performance of steel wire rope thimbles.
Key Topics
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Scope and Application:
The standard applies specifically to thimbles used with steel wire ropes but excludes those for fibre ropes and certain specialized thimble types.
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Material Requirements:
Thimbles must be produced from steel conforming to ISO 630, with key mechanical properties such as:
- Tensile strength: 360-520 MPa
- Elongation after fracture: minimum 20%
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Galvanizing:
Unless specified otherwise, thimbles should be hot-dip galvanized with a zinc coating of at least 120 g/m² as per ISO 1461, providing corrosion protection.
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Nominal Sizes & Dimensions:
The nominal size of a general purpose thimble corresponds to the diameter of the rope it is intended for, covering a range from 4 mm to 60 mm.
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Workmanship and Testing:
Thimbles must be free from defects, sharp edges, or rough surfaces that could damage the rope. The design should allow a small gap at the joint after galvanizing, and the joint must not be welded.
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Performance Testing:
Prototype thimbles undergo testing to demonstrate their capability to withstand loading conditions representative of practical use, including axial load tests with required dimensions maintained after testing.
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Documentation:
Manufacturers are required to provide a certificate reporting compliance with ISO 2262:1984, specifying the thimble design, material, and test results upon request.
Applications
ISO 2262:1984 thimbles are used broadly in lifting equipment, rigging operations, and a variety of industrial sectors where steel wire ropes are deployed for lifting, anchoring, or securing loads. Primary applications include:
- Construction and heavy lifting
- Maritime and offshore rigging
- Mining operations
- General industrial machinery and equipment
Following this standard helps ensure that thimbles provide essential protection to wire ropes, minimizing wear at attachment points and extending the service life of both thimbles and ropes.
Related Standards
- ISO 2408: Specifies the characteristics and requirements for steel wire ropes for general purposes, forming the basis for thimble compatibility under ISO 2262:1984.
- ISO 630: Addresses the specifications for structural steels used in thimble manufacturing.
- ISO 1461: Details hot-dip galvanized coatings on fabricated ferrous products, relevant for thimble surface protection.
- ISO 6892: Covers methods for tensile testing of metallic materials, referenced in the assessment of thimble mechanical properties.
Adherence to ISO 2262:1984, along with these related international standards, supports safe, reliable, and standardized practices in wire rope and lifting applications worldwide.