The Haffin slot bolt, also known as the "Huffing" groove T-bolt, is a key component in modern construction and architectural engineering. It's part of the comprehensive anchoring system developed by the HALFEN GROUP, a global leader in concrete anchoring solutions and curtain wall connection systems. Established in 1929, the company has built a strong reputation for delivering innovative, cost-effective, and reliable products tailored to meet diverse customer needs. With over 20,000 product variations available, HALFEN has become a trusted brand in the construction industry.
The name "Haffin" originates from the company’s early development of embedded channels used in railway infrastructure. These channels are widely used in high-speed rail systems across Germany, Japan, and France, which highlights their durability and performance. This legacy forms the basis of the Haffin channel steel and the T-bolt used in various construction applications today.
Haffin Grooves are highly versatile and user-friendly fixtures that simplify installation and adjustment. They are designed to prevent concrete from entering the channel by using foam or strip fillers. These grooves can be used to fix a wide range of components, such as concrete curtain walls, precast slabs, pipeline supports, and brickwork structures. Additionally, they are ideal for dynamic load applications like lifting rails or mechanical fixtures, where special hot-rolled channel steels may be required.
Key quality features of Haffin channel steel include:
- High load capacity (up to 32kN or 128kN/m)
- Small margin tolerance (up to 5cm)
- Easy to adjust during installation
- No noise or dust generated during installation
- Certified for both static and dynamic loading
- Excellent corrosion resistance through the use of stainless steel or hot-dip galvanized steel
These qualities make Haffin channel steel an essential solution for architects, engineers, and contractors alike.
In addition, Haffin systems are often used in glass curtain walls, where aluminum or other metal profiles serve as the structural skeleton. These walls can be single or double-glazed, with reflective insulating glass that is only 6mm thick, weighing approximately 40kg/m². The result is a lightweight, aesthetically pleasing, and energy-efficient building envelope. The outer surface is coated with a colored metal layer, giving the wall a mirror-like appearance that reflects the surroundings and changes color with the light. Inside, the lighting remains soft and comfortable, without harsh glare.
Technical specifications for Haffin embedded parts include:
- C-shaped steel and I-beams (78 * 25 * 5) made through hot rolling
- Material: Q235 steel
- Hot-dip galvanized surface with a zinc layer thickness of at least 55µm
For hot-forged T-bolts:
- Made from 45# steel, forged and tempered
- Tensile strength of T-bolts and C-slot embedded parts ≥70kN
- Threads conform to GB196 and GB197 standards
- Galvanized and passivated surface with a minimum post-centrifugal galvanization thickness of 15µm
The introduction of groove embedded parts has significantly improved the performance of large-scale exterior curtain walls. Their application enables true unit-based construction, offering balanced force distribution, ease of installation, and simple adjustment—making them a preferred choice in modern construction projects.
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