A Twist Lock is a fundamental and critical piece of lashing equipment used in the intermodal shipping industry. Its primary function is to securely fasten shipping containers to each other and to the deck of a ship, truck, or railcar. The mechanism involves inserting the lock's base into the corner casting of a container and then "twisting" the handle (typically a 90-degree turn) to engage the locking head, creating a rigid and secure connection.
Our High-Quality Mechanism Twist Locks are manufactured to the highest standards, adhering to strict ISO dimensional requirements. They are built from high-tensile steel and undergo rigorous heat treatment and testing processes to ensure exceptional strength, durability, and resistance to corrosion. This makes them reliable for the most demanding sea voyages and heavy cargo operations, providing essential safety and stability.
1.Product Introduction of Forged Steel Tie Down Bottom Shipping Container Side Twist Lock
ISO Twist Locks are precision-engineered lashing devices critical for safely securing intermodal shipping containers during transport by sea, rail, or road. Designed to meet strict ISO 1161:1984 and ISO 3874:2017 standards, these components ensure compatibility, strength, and reliability across global logistics networks.
ISO-Dimensional Compliance:
Manufactured to exact ISO corner casting dimensions (standardized apertures: 259 mm x 129 mm / 10.2" x 5.1").
Guarantees universal interoperability with all ISO containers (20ft, 40ft, HC, etc.).
Types & Applications:
Bottom Twist Locks: Anchor containers to chassis, railcars, or vessel cell guides.
Top Twist Locks: Secure stacked containers vertically (2-high, 3-high stacking).
Double-Ended/Intermediate Locks: Connect containers side-by-side on deck.
2.Product Parameter of Forged Steel Tie Down Bottom Shipping Container Side Twist Lock
| Parameter | Specification | Notes |
|---|---|---|
| Applicable Standard | ISO 1161:2015, ISO 3874 | Standards for series 1 freight container corner fittings and lashing/securing. |
| Type | Manual Semi-Automatic Twist Lock | Common type for manual stacking and securing. |
| Working Load Limit (WLL) | 16 metric tons / 35,200 lbs | Minimum guaranteed safe working load. |
| Breaking Load / Ultimate Strength | ≥ 48 metric tons / 105,600 lbs | Typically 3 times the WLL or higher. |
| Material | High-Tensile Carbon Steel (e.g., Grade Q235B, Q345B) | Provides the core strength. |
| Surface Treatment | Hot-Dip Galvanized (HDG) | Standard coating; thickness ~55-85μm. Alternative: Zinc-Aluminum alloy. |
| Head Dimensions | Approx. 178mm (L) x 162mm (W) | Designed to fit precisely into the ISO corner casting aperture. |
| Stem Length | Customizable (e.g., 55mm, 85mm, 110mm) | Varies based on application (stacking on ship, truck, etc.). |
| Operating Angle | 90° Rotation | Quarter-turn from unlocked to locked position. |
| Net Weight | Approx. 3.5 - 4.5 kg | Varies slightly with stem length and design. |
| Safety Marking | WLL, Grade, Manufacturer's Mark | Clearly stamped on the body for traceability and safety checks. |
| Quality Assurance | 100% Load Tested, Certification Available | Each batch is tested, and Mill Certificates or 3.1/3.2 certificates can be provided. |
Container Ship Stowage: Vertical and horizontal locking of containers in cell guides and on deck.
Container Yard Stacking: Securing containers stacked on top of each other.
Road and Rail Transport: Fixing containers to flatbed trucks and railcars.
Note: Always inspect twist locks before use and ensure they are operated by trained personnel according to the vessel's or terminal's Cargo Securing Manual (CSM). Using high-quality equipment like this is essential for preventing cargo loss and ensuring the safety of crew, port workers, and infrastructure.
Detailed Photos
We also supply different kinds of trailer container twist lock for your choice;
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