Overview
ISO 8148:1985 specifies fixed-type derrick boom headfittings used in shipbuilding and marine structures for cargo handling. The standard defines dimensions, materials, fabrication, heat treatment, tolerances and marking for headfittings fitted at the hoisting (hissage) and topping (apiquage) ends of derrick booms. An informative annex gives guidance on positioning and mounting, including reference to the guy eyeplate (eyeplate per ISO 8146).
Example product designation used in the standard:
Key topics and requirements
- Types: Two fixed types are defined
- Type A: hoisting end with a parallel oval eye
- Type B: hoisting end with an oblique oval eye
- Materials: Steel in accordance with ISO 630, grade Fe 360 (minimum). Naval-grade plate allowed if mechanical properties and weldability are equivalent.
- Dimensions and nominal loads: Nominal sizes are expressed as numeric values derived from the admissible load (in kilonewtons). The standard provides a table of nominal sizes and the corresponding dimensional data for hoisting and topping ends.
- Manufacture:
- Prefabrication by oxy-cutting followed by forging or machining as required
- Components may be manufactured in two parts and welded into one piece before assembly
- Surface must be free from visible cracks, scaling and lamination
- Heat treatment: Forged fittings are to be normalized after all fabrication operations are completed.
- Tolerances: Specific tolerancing rules apply (e.g., foundational IT tolerance for some critical dimensions per ISO/R 286 and percentage-based allowances for others).
- Marking:
- Headfittings must be indelibly and legibly marked on both hoisting and topping sides with their respective nominal sizes
- Marking must be sited outside high-stress zones
- Punch sizes specified (e.g., 5 mm for nominal 2/2.5; 6.3 mm for nominal sizes 3–63)
Applications and users
ISO 8148 is intended for:
- Shipbuilders and shipyards specifying derrick boom fittings
- Marine equipment and forging manufacturers producing headfittings and related components
- Naval architects and marine engineers designing derrick and cargo-handling gear
- Class societies, surveyors and procurement teams verifying conformity with international dimensional and marking standards
Practical benefits:
- Ensures interchangeability and safe loads for derrick boom fittings
- Standardizes manufacturing, inspection and procurement criteria for fixed-type headfittings
Related standards
- ISO 8146 - Pitons à œil ovale (eyeplates) for derrick booms
- ISO 8147 - Shipboard lifting appliances terminology and definitions
- ISO 630 - Structural steels
- ISO/R 286 - System of tolerances and fits
Keywords: ISO 8148, derrick boom headfittings, shipbuilding standard, marine structures, fixed type, dimensions, materials, marking, positioning, guy eyeplate, ISO 8146.
