Hot-dip galvanized HDG carbon steel welded J-shaped foundation anchor rods for wet concrete

Hot-dip galvanized HDG carbon steel welded J-shaped foundation anchor rods for wet concrete

1,Description:

J-bolts (J-type bolts/J-type anchor bolts), also known as umbrella-handle anchor bolts or hook-head bolts, possess the following principal characteristics:
Structural Features
Design: The J-bolt features an 180° hook at its end, resembling the letter ‘J’ or an umbrella handle. This hook section engages with reinforcing bars (rebar) within concrete to form a mechanical lock. Unlike the 90° right angle of L-bolts, the J-type hook provides a larger anchoring contact area.
Performance Characteristics
High Pull-Out Resistance: Due to its unique hook design, the J-bolt achieves superior anchoring performance in concrete. For equivalent specifications, J-bolts typically exhibit 20%-30% greater pull-out resistance than L-bolts. The hook design creates a stronger mechanical interlocking effect, preventing the bolt from being pulled out of the concrete.
High Load Capacity: J-bolts generally possess greater load-bearing capacity, making them suitable for heavy-duty structures subjected to significant loads. Their design enables outstanding resistance to vertical pull-out forces.
Superior Seismic Performance: The hook design demonstrates greater stability under dynamic loads and vibrational conditions such as earthquakes, making it ideal for high-vibration environments including industrial buildings and machinery foundations.

2,Applications:

Limitations
Processing difficulty: Larger-sized J-bolts (typically exceeding M36) present significant challenges during heating and bending processes, with machining precision being difficult to control. Consequently, they are generally recommended for use in towers of M36 and below specifications, and are suitable for scenarios involving relatively minor load-bearing requirements.
Installation Irreversibility: Once concrete has been poured, the position of J-bolts becomes difficult to adjust, necessitating precise pre-embedded positioning.
Limited Lateral Force Resistance: Whilst exhibiting excellent pull-out resistance, they are less effective than L-bolts in resisting horizontal lateral forces and typically require use in conjunction with other structural components.

Key Differences:
The American standard 10-gauge bolt has a shank diameter of 4.826mm, whereas the equivalent German/Chinese standard M5 has a diameter of exactly 5mm – a difference of 0.174mm, rendering them non-interchangeable.
The American standard 1/2-13 UNC pitch is approximately 1.954mm, while the equivalent German standard M12×1.75 pitch is 1.75mm, indicating differing thread densities.

 

Packaging Options

Available in small packing, carton packing, or pallet configurations to meet your shipping and storage requirements.

Manufacturer Information

Manufactured by JIA SHAN Hardware Company with strict quality control measures and pre-shipment inspection.