Overview
ISO/TR 15069:2018 is a Technical Report that explains the technical and operational rationale behind the requirements in ISO 3874:2017, Annexes A–E. Focused on Series 1 freight containers - handling and securing, the report documents why specific dimensions, tolerances and strength tests were chosen for devices such as twistlocks, collars and intermediate plates. It is intended as background guidance for designers, operators and regulators responsible for container securing and handling.
Key Topics and Requirements
- Scope and purpose
- Provides background to ISO 3874:2017 Annexes A–E; validates dimensions and strength against industry practice (e.g., Container Securing Manual for large vessels).
- Twistlocks (general)
- Defines terms used for manual, semi-automatic and fully automatic twistlocks (FAT), Automatic Container Locks (AL) and Midlocks.
- Notes that automatic locks operate as a system and require new functional testing.
- Dimensions
- Top/bottom cones: Designed so load-bearing area in an ISO 1161 corner fitting is larger than 800 mm².
- Intermediate plate: Universal thickness set at 28 mm; prior flange-area minimum (4 500 mm²) was removed due to diverse designs.
- Handle and collar dimensions chosen to allow operation and account for ISO 668 tolerances; collar length set at 117 mm for 20 ft use.
- Distance between top and bottom lock: Defined as intermediate plate thickness plus two times (33 ± 1) mm to ensure cone rotation.
- Strength requirements
- Manual/semi‑automatic twistlocks: tensile strength aligned with ISO 17905:2015 (value in 2017 edition set to 150 kN for certain cases); intermediate plate compression increased to 1 000 kN; additional 150 kN compression test simulates misalignment; collar shear: 300 kN longitudinal, 150 kN transverse.
- Automatic/container locks: intermediate plate compression 1 000 kN; cone compression 150 kN; shear-resisting structure required where collars are absent. Tensile values referenced to ISO 17905:2015.
Applications and Users
- Practical use for:
- Container and twistlock manufacturers (design, testing, type approval)
- Ship operators, terminal operators and cargo securing planners
- Classification societies, regulators and safety inspectors
- Engineers producing container securing manuals and ship stowage procedures
- Helps ensure safe lifting, stacking and securing of Series 1 freight containers across sea, rail and road transport modes.
Related Standards
- ISO 3874:2017 - Series 1 freight containers: handling and securing (normative)
- ISO 1161 - Corner and intermediate fittings
- ISO 668 - Container dimensions and ratings
- ISO 1496 series - Container specification and testing
- ISO 17905:2015 - Container securing devices (tensile/strength guidance)
Keywords: ISO/TR 15069:2018, ISO 3874:2017, series 1 freight containers, twistlocks, handling and securing, intermediate plate, tensile strength, compression strength, shear strength, automatic locks.
Open preview (PDF)Series 1 freight containers — Handling and securing — Rationale for ISO 3874:2017, Annexes A to E
