English 
Content Menu
● Understanding BBB Anchor Chain
>> Key Features of BBB Anchor Chain
● Advantages of Using BBB Anchor Chain
● Disadvantages of Using BBB Anchor Chain
● Comparison with Other Types of Anchor Chains
● Choosing the Right Size of BBB Anchor Chain
● Maintenance Tips for BBB Anchor Chain
● The Role of Weight in Anchoring
● FAQ
>> 1. What does "BBB" stand for in anchor chains?
>> 2. How does BBB anchor chain compare to high-test anchor chain?
>> 3. Is BBB anchor chain suitable for all types of boats?
>> 4. How often should I inspect my BBB anchor chain?
>> 5. What length of BBB anchor chain should I use?
The BBB anchor chain, also known as "3B," is a type of anchor chain widely used in marine applications, particularly for cruising boats. It is recognized for its robust construction and ability to provide excellent holding power when anchoring. This article will explore the characteristics, advantages, and disadvantages of BBB anchor chain, as well as its comparison with other types of anchor chains available in the market.
BBB anchor chain is manufactured from low-carbon steel, which contributes to its durability and strength. The term "BBB" stands for "Bend Before Break," indicating that the chain is designed to withstand significant stress before failing. The links of the chain are short and compact, making it flexible and less prone to tangling in the chain locker.
- Material: Made from low-carbon steel, providing good strength and corrosion resistance when galvanized.
- Link Design: Short links enhance flexibility and reduce the likelihood of tangling.
- Calibrated for Windlasses: Specifically designed to fit most modern windlass systems, ensuring compatibility and ease of use.
- Weight: Generally heavier than other types of chains, which can aid in anchoring by creating a catenary curve that helps maintain tension on the anchor.
BBB chains come in various sizes, typically ranging from 5/16 inch to 1/2 inch in diameter. The specifications for these sizes are as follows:
- 5/16 inch BBB Chain:
- Working Load Limit (WLL): 1,900 lbs
- Breaking Strength: 7,600 lbs
- Weight: 1.1 lbs per foot
- 3/8 inch BBB Chain:
- Working Load Limit (WLL): 2,750 lbs
- Breaking Strength: 11,000 lbs
- Weight: 1.6 lbs per foot
- 1/2 inch BBB Chain:
- Working Load Limit (WLL): 4,500 lbs
- Breaking Strength: 18,000 lbs
- Weight: 2.8 lbs per foot
These specifications highlight the significant safety margins inherent in BBB chains, with breaking strengths typically four times greater than their working loads. The rigorous testing and quality control during manufacturing ensure that each link meets high standards of strength and reliability[1].
- Heavy Weight: The weight of the chain contributes to its holding power when anchored. A heavier chain creates a catenary effect that helps keep the anchor set firmly on the seabed.
- Durability: Made from low-carbon steel and often hot-dip galvanized, BBB chains resist corrosion effectively, extending their lifespan even in harsh marine environments.
- Compatibility with Windlasses: The calibrated design ensures that BBB chains work seamlessly with most windlass systems, making them easy to deploy and retrieve.
- Cost-Effectiveness: Compared to high-test chains (HT), BBB chains are generally more affordable while still providing reliable performance for cruising boats.
- Weight Concerns: While the weight can be an advantage for anchoring, it can also negatively affect a boat's performance while underway. On lighter displacement boats, excessive weight in the bow can lead to pitching and handling issues.
- Less Strength Compared to High-Test Chains: Although strong, BBB chains do not match the strength-to-weight ratio of high-test chains made from higher-grade steel. This means that for boats with limited storage space or those requiring lighter setups, high-test options may be preferable.
When selecting an anchor chain, it's essential to understand how BBB compares with other common types:
| Feature | BBB Chain | High-Test Chain | Proof Coil Chain |
|---|---|---|---|
| Material | Low-carbon steel | High carbon-manganese alloy | Low-carbon steel |
| Weight | Heavier | Lighter | Heavier |
| Strength (WLL) | Moderate | Higher | Moderate |
| Calibrated for Windlass | Yes | Yes | No |
| Cost | Moderate | Higher | Lower |
This table illustrates that while BBB chains offer good performance and durability at a reasonable price point, high-test chains may be better suited for specific applications where weight savings are critical[2].
Selecting the appropriate size of BBB anchor chain depends on several factors:
1. Boat Size: Larger boats typically require thicker chains to handle greater loads.
2. Anchoring Conditions: Consider the seabed type and expected weather conditions where you will be anchoring.
3. Windlass Compatibility: Ensure that your windlass is compatible with the size of chain you choose.
A common recommendation for cruising yachts is a minimum length of 300 feet of chain to provide adequate scope when anchoring in deeper waters[1].
To ensure longevity and performance:
- Regularly inspect the chain for signs of wear or corrosion.
- Clean the chain after use in saltwater to prevent buildup.
- Store it properly in a dry place when not in use.
By maintaining your BBB anchor chain properly, you can ensure it remains an effective tool for securing your vessel while at anchor[3].
The weight of an anchor chain plays a crucial role in its performance. A heavier chain contributes to better holding power due to its ability to create a catenary curve when deployed. This curve helps maintain tension on the anchor by reducing upward pull on it from waves or wind. For example:
- A standard recommendation is that a boat should have at least five times its waterline length in anchor rode (chain plus rope) when anchoring in calm conditions.
- In storm conditions or rough seas, this ratio increases significantly; some experts recommend up to ten times the waterline length[4].
The sag created by a heavy chain allows it to lay flat on the seabed rather than pulling straight up towards the boat. This horizontal load helps set the anchor more securely into the bottom material.
When using any type of anchor chain, safety should always be a priority:
- Ensure that all connections are secure and that there are no weak points in your ground tackle system.
- Regularly check your windlass system for proper operation; any malfunction could lead to dangerous situations while retrieving or deploying your anchor.
- Always have a backup plan; consider carrying additional anchors or alternative anchoring methods if conditions become severe[5].
Understanding the cost implications when choosing an anchor chain is essential:
- The price per foot varies significantly between different types of chains. For example:
- 5/16 inch BBB costs approximately $6.19 per foot
- 3/8 inch costs around $6.79 per foot
- 1/2 inch costs about $8.20 per foot
When calculating overall costs for a complete anchoring system (chain plus windlass), it's crucial to factor in both initial costs and long-term durability[6].
In summary, the BBB anchor chain remains a popular choice among sailors due to its durability, strength-to-weight ratio, and compatibility with windlass systems. While it may not be the lightest or strongest option available compared to high-test alternatives, its advantages make it suitable for many cruising applications. Understanding its characteristics will help boaters make informed decisions based on their specific needs and conditions.
"BBB" stands for "Bend Before Break," indicating that this type of chain is designed to withstand significant stress before failing.
BBB anchor chains are heavier but generally less strong than high-test chains made from higher-grade steel. High-test chains offer better strength-to-weight ratios but may not provide as much holding power due to their lighter weight.
While suitable for many cruising boats, lighter displacement vessels may experience handling issues due to the weight of BBB chains. It's essential to consider your boat's design when choosing an anchor chain.
Regular inspections are recommended after each use or at least once a season to check for wear or corrosion.
A common recommendation is at least 300 feet for cruising yachts to ensure adequate scope when anchoring in deeper waters.
[1] https://www.riggingdoctor.com/life-aboard/2017/12/24/bbb-chain
[2] https://www.cruisingworld.com/how/your-chain-explained-understanding-anchor-chain/
[3] https://eastmarineasia.com/blogs/east-marine-asia-blog-boating-tips-tools-techniques-guidance-and-advice/how-to-select-the-correct-anchor-chain
[4] https://www.gonewiththewynns.com/scammed-anchor-chain/
[5] https://www.practical-sailor.com/sails-rigging-deckgear/special-section-anchoringanchor-and-mooring-chains-vinyl-covered-chain-is-the-pits
[6] https://www.miamicordage.com/product/bbb-anchor-chain-galvanized/
[7] https://www.imtra.com/learning-center/articleid/23/windlass-maintenance-tips
[8] http://www.siranah.de/html/sail016d.htm
[9] https://www.sailnet.com/threads/anchor-chain.333662/
[10] https://www.practical-sailor.com/sails-rigging-deckgear/anchoring-mooring/making-sense-of-marine-chain-standards
