Overview
ISO 6045:1987 - "Shipbuilding and marine structures - Bearings for derrick goosenecks - Assemblies and components" defines standard types, dimensions, materials and manufacturing guidance for derrick boom gooseneck bearings used on board ships for cargo handling. The standard covers conventional derrick designs (not special derricks) and provides ordering/nominal-size rules based on maximum thrust (kilonewtons). It specifies assemblies, component forms and a designation system for gooseneck bearing assemblies.
Key topics
- Assembly types: Three primary types are defined:
- Type A - straight gooseneck pin (standard assembly)
- Type B - cranked (offset) gooseneck pin
- Type C - straight pin model with washer (special request)
- Main components: Gooseneck pins (forms GA, GB, GC), bearing eyes (forms D, E), cargo runner lead block holders (forms F, H), retaining rings (J) and retaining pins (K). Dimension tables are provided for each component (tables 5–13).
- Nominal size and loads: Nominal sizes are numeric reference values derived from maximum thrust or lead block load (kN) for ordering and specification.
- Dimensions and tolerances: Main dimensions are specified in detailed tables; dimensional tolerances follow ISO 286‑1 (tolerance grade IT14).
- Materials and quality: Components are specified to be made from steel per ISO 630; higher‑quality or heat‑treated quenched steels must comply with ISO 683‑1.
- Manufacture and finishing: Acceptable manufacturing methods include forging, flame cutting and welding. Guidance is given on flame‑cut profiling, welding penetration, rounded corners to avoid stress concentration, machined bearing surfaces and provision for lubrication.
- Designation/ordering: A standard designation format is provided (example: Bearing ISO 6045 - A4F2 - S), indicating standard number, assembly type, nominal sizes, lead block holder form and manufacturing code.
Applications / Who uses it
ISO 6045 is intended for practical use in:
- Shipbuilders and shipyards specifying derrick gooseneck bearings for cargo handling gear
- Naval architects and structural engineers designing derrick rigs and goosenecks
- Marine equipment manufacturers and forging shops producing bearings, pins and eyes
- Rigging and deck gear suppliers, Class societies and ship operators verifying component conformity
- Procurement teams ordering standardised gooseneck bearing assemblies by nominal size and type
Using ISO 6045 helps ensure interchangeability, safety and predictable performance of derrick gooseneck bearings across marine cargo handling applications.
Related standards
- ISO 286‑1 - Limits and fits (tolerances)
- ISO 630 - Structural steels
- ISO 683‑1 - Heat‑treatable and quenched steels (when required)
- ISO 8147 - Derrick rigs and component vocabulary
Keywords: ISO 6045:1987, derrick gooseneck bearings, shipbuilding, marine structures, gooseneck pin, bearing eye, lead block holder, nominal size, cargo handling, bearing assemblies.
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