Hollo-bolts are strong and flexible fasteners used for connecting steel structures and hollow sections. In this guide, we’ll explore the Hollo-bolts size chart to help you pick the right one for your project. Choosing the right size involves trade-offs between strength, installation ease, and long-term durability.
Hollo-Bolt Sizes, Tensile, Shear & Dimensional Info for Hex And CounterSunks
| Head Type | Code | Diam/Length | ClampingRange | Otr Ply | SleeveLength | Collar | Torq | Safe Working Load 5: 1 | |||
| (W) | min t | (L) | Height (H) | Diam | AcrosFlats | ft/lb | Tensile | Shear | |||
| Hex | LHBM08#1 | 5/16 x 2 | 1/8 to 7/8 | – | 1-3/16 | 3/16 | 7/8 | 3/4 | 17 | 899 | 1124 |
| Hex | LHBM08#2 | 5/16 x 2-3/4 | 7/8 to 1-5/8 | – | 1-15/16 | 3/16 | 7/8 | 3/4 | 17 | 899 | 1124 |
| Hex | LHBM08#3 | 5/16 x3-9/16 | 1-5/8 to 2-3/8 | – | 2-11/16 | 3/16 | 7/8 | 3/4 | 17 | 899 | 1124 |
| Hex | LHBM10#1 | 3/8 x 2-3/16 | 1/8 to 7/8 | – | 1-3/16 | 1/4 | 1-1/8 | 15/16 | 33 | 1910 | 2248 |
| Hex | LHBM10#2 | 3/8 x 2-3/4 | 7/8 to 1-5/8 | – | 1-7/8 | 1/4 | 1-1/8 | 15/16 | 33 | 1910 | 2248 |
| Hex | LHBM10#3 | 3/8 x 3-9/16 | 1-5/8 to 2-3/8 | – | 2-5/8 | 1/4 | 1-1/8 | 15/16 | 33 | 1910 | 2248 |
| Hex | LHBM12#1 | 1/2 x 2-3/8 | 1/8 to 1 | – | 1-3/8 | 1/4 | 1-1/4 | 1-3/16 | 59 | 2360 | 3372 |
| Hex | LHBM12#2 | 1/2 x 3-5/32 | 1 to 1-13/16 | – | 2-1/4 | 1/4 | 1-1/4 | 1-3/16 | 59 | 2360 | 3372 |
| Hex | LHBM12#3 | 1/2 x 4 | 1-13/16 – 2-3/4 | – | 3-1/8 | 1/4 | 1-1/4 | 1-3/16 | 59 | 2360 | 3372 |
| Hex (HCF) | LHBM16#1 | 5/8 x 3 | 1/2 to 1-1/8 | 5/16 | 1-5/8 | 5/16 | 1-1/2 | 1-3/8 | 140 | 4720 | 6744 |
| Hex (HCF) | LHBM16#2 | 5/8 x 4 | 1-1/8 to 2 | 5/16 | 2-1/2 | 5/16 | 1-1/2 | 1-3/8 | 140 | 4720 | 6744 |
| Hex (HCF) | LHBM16#3 | 5/8 x 4-3/4 | 2 to 2-13/16 | 5/16 | 3-5/16 | 5/16 | 1-1/2 | 1-3/8 | 140 | 4720 | 6744 |
| Hex (HCF) | LHBM20#1 | 3/4 x 3-9/16 | 1/2” to 1-5/16 | 5/16 | 1-15/16 | 3/8 | 2 | 1-13/16 | 221 | 7868 | 8992 |
| Hex (HCF) | LHBM20#2 | 3/4 x 4-3/4 | 1-5/16 – 2-3/8 | 5/16 | 3 | 3/8 | 2 | 1-13/16 | 221 | 7868 | 8992 |
| Hex (HCF) | LHBM20#3 | 3/4 x 5-7/8 | 2-3/8 to 3-3/8 | 5/16 | 4 | 3/8 | 2 | 1-13/16 | 221 | 7868 | 8992 |
| Countersunk | LHBCSKM08#1 | 5/16 x 2 | 1/8 to 7/8 | – | 1-3/16 | 3/16 | 7/8 | 3/4 | 17 | 899 | 1124 |
| Countersunk | LHBCSKM08#2 | 5/16 x 2-3/4 | 7/8 to 1-5/8 | – | 1-15/16 | 3/16 | 7/8 | 3/4 | 17 | 899 | 1124 |
| Countersunk | LHBCSKM08#3 | 5/16 x3-9/16 | 1-5/8 to 2-3/8 | – | 2-11/16 | 3/16 | 7/8 | 3/4 | 17 | 899 | 1124 |
| Countersunk | LHBCSKM10#1 | 3/8 x 2 | 1/8 to 7/8 | – | 1-3/16 | 1/4 | 1-1/8 | 15/16 | 33 | 1910 | 2248 |
| Countersunk | LHBCSKM10#2 | 3/8 x 2-3/4 | 7/8 to 1 5/8 | – | 1-7/8 | 1/4 | 1-1/8 | 15/16 | 33 | 1910 | 2248 |
| Countersunk | LHBCSKM10#3 | 3/8 x 3-9/16 | 1-5/8 to 2-3/8 | – | 2-5/8 | 1/4 | 1-1/8 | 15/16 | 33 | 1910 | 2248 |
| Countersunk | LHBCSKM12#1 | 1/2 x 2-3/16 | 1/8 to 1 | – | 1-3/8 | 1/4 | 1-1/4 | 1-3/16 | 59 | 2360 | 3372 |
| Countersunk | LHBCSKM12#2 | 1/2 x 3-5/32 | 1 to 1-13/16 | – | 2-1/4 | 1/4 | 1-1/4 | 1-3/16 | 59 | 2360 | 3372 |
| Countersunk | LHBCSKM12#3 | 1/2 x 4 | 1-13/16 – 2-3/4 | – | 3-1/8 | 1/4 | 1-1/4 | 1-3/16 | 59 | 2360 | 3372 |
| Countersunk (HCF) | LHBCSKM16#1 | 5/8 x 2-3/4 | 1/2 to 1-1/8 | 5/16 | 1-5/8 | 5/16 | 1-1/2 | 1-3/8 | 140 | 4720 | 6744 |
| Countersunk (HCF) | LHBCSKM16#2 | 5/8 x 4 | 1-1/8 to 2 | 5/16 | 2-1/2 | 5/16 | 1-1/2 | 1-3/8 | 140 | 4720 | 6744 |
| Contrsnk (HCF) | LHBCSKM16#3 | 5/8 x 4-3/4 | 2 to 2-13/16 | 5/16 | 3-5/16 | 5/16 | 1-1/2 | 1-3/8 | 140 | 4720 | 6744 |
Understanding Hollo-Bolts Size Chart
The Hollo-bolts size chart is an essential tool that helps you understand key details like diameter, length, and grip range. When reading the chart, pay close attention to how each size relates to your specific application.
For example, larger diameters offer more strength but can be harder to install in tight spaces. The grip range determines the thickness of the material the bolt can hold, which impacts both stability and ease of use.
Balancing these factors can be tricky. Choosing a smaller bolt may simplify installation, but it could compromise structural integrity. On the other hand, selecting a larger size ensures strength but may add complexity to the process. It’s crucial to understand how bolt size and material thickness work together, as an incorrect pairing can lead to problems like inadequate load-bearing or bolt failure.
When deciding which Hollo-bolt size to use, consider the long-term effects on your project’s durability and safety. Each choice impacts both performance and the overall outcome.
How to Choose the Right Hollo-Bolt for Your Project
Choosing the right Hollo-bolt involves carefully evaluating your project’s specific requirements, such as material thickness, load capacity, and environmental conditions. First, consider the thickness of the material you’re working with. Thicker materials require larger Hollo-bolts with longer grip ranges, but these may be harder to install, especially in confined spaces. On the other hand, using smaller bolts might simplify installation but could reduce the load capacity, creating a trade-off between ease and strength.
Next, think about the load the Hollo-bolts will need to support. If your project demands higher load-bearing capacity, opting for larger bolts is essential. However, larger bolts may require more precise alignment and stronger tools, which adds complexity to the installation process. Balancing these factors is key to ensuring both efficiency and safety.
For example, in construction projects where environmental conditions, like exposure to moisture or extreme temperatures, come into play, you might need corrosion-resistant Hollo-bolts. These provide long-term durability but can increase costs and installation challenges. Comparing sizes and materials helps you make informed choices that suit your project’s needs.
In real-world scenarios, engineers often face challenges when selecting the right Hollo-bolts. One successful example involved a bridge repair project where large-diameter Hollo-bolts were chosen for their strength. Despite the more complex installation, the decision ensured long-term stability under heavy loads, highlighting the importance of making the right size choice for your project’s longevity.
FAQs
FAQ 1: What factors should I consider when selecting a Hollo-bolt size?
Answer: When choosing a Hollo-bolt size, consider factors like material thickness, load capacity, and grip range. Thicker materials require larger bolts with a longer grip range, while the load capacity determines how much weight the bolt can support. Balancing these with ease of installation and environmental conditions is crucial for ensuring a successful project.
FAQ 2: Can I use smaller Hollo-bolts to simplify installation?
Answer: While smaller Hollo-bolts may be easier to install, they might not provide the strength and load capacity required for heavier or more critical projects. It’s important to weigh the trade-off between ease of installation and the structural integrity needed for your specific application.
FAQ 3: How does the environment affect Hollo-bolt selection?
Answer: Environmental factors such as moisture, temperature, and exposure to chemicals can affect the durability of Hollo-bolts. In harsh environments, corrosion-resistant Hollo-bolts are recommended. While they may increase costs, they provide long-term protection and prevent structural issues, ensuring the bolts last longer in challenging conditions.