A Forged Steel Tie Down Lock, commonly known as a Dovetail Twist Lock, is a critical and robust securing device used in the transportation and logistics industry. Its primary function is to securely fasten a shipping container to a trailer, railcar, or ship deck, preventing any movement during transit.
The name comes from its key features:
Forged Steel: The component is manufactured through forging, a process that aligns the grain structure of the steel, resulting in superior strength, toughness, and impact resistance compared to cast alternatives. This makes it ideal for handling heavy loads and enduring the stresses of transportation.
Dovetail: This refers to the shape of the lock head, which is designed to slide perfectly into the standardized "dovetail" pocket found on the corner castings of trailers and railcars.
Twist Lock: The operational mechanism. Once the lock is inserted into the dovetail pocket, the operator uses a lever to rotate (or "twist") the head by 90 degrees. This action locks the container securely in place.
These devices are essential for ensuring safety on the roads, rails, and seas, protecting both the cargo and the public.
A dovetail twist lock is a mechanical fastening system designed to securely connect trailers, shipping containers, or modular equipment by combining a dovetail groove and a rotating locking mechanism. This hybrid design ensures precise alignment and robust load transfer, making it ideal for heavy-duty applications where stability and rapid coupling/uncoupling are critical.
Here are the typical specifications for a standard forged steel dovetail twist lock:
| Parameter | Specification / Description |
|---|---|
| Product Name | Dovetail Twist Lock / Container Tie Down Lock |
| Material | High-Strength Forged Steel |
| Finish / Coating | Typically Hot-Dip Galvanized for superior corrosion resistance. Painted finishes are also available. |
| Working Load Limit (WLL) | 25 Tons / 50,000 lbs (This is a standard rating, but always verify for the specific product). |
| Minimum Breaking Load (MBL) | Typically 4-6 times the WLL (e.g., ~100-150 Tons). |
| Head Dimensions | Designed to fit standard dovetail pockets (approx. 74mm x 74mm). |
| Operation | Manual. Features an operating lever for easy 90-degree engagement and disengagement. |
| Standards & Certifications | Complies with ISO 3874 (Series 1 freight containers), ASTM A-489, and other relevant international standards for container securing devices. May have ABS (American Bureau of Shipping) or other classification society approval. |
| Application | Used for securing shipping containers to trailers, railcars, and container stacks on ships. Specifically designed for use with dovetail pockets. |
| Key Features | • Superior strength and durability due to forging process. • Easy to operate and inspect. • Galvanized coating for long service life in harsh environments. • Prevents vertical and horizontal container movement. |
Important Safety Note: Always inspect twist locks for wear, damage, or deformation before use. Never use a damaged lock. The Working Load Limit (WLL) must never be exceeded.
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