Standard threaded J-bolt anchor bolts for automotive parts HGD anchor bolts Foundation boltte

Standard threaded J-bolt anchor bolts for automotive parts HGD anchor bolts Foundation bolt

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:

J-bolts and L-bolts are two commonly used types of anchor bolts, exhibiting significant differences in structure, performance, and application.
Structural Differences
J-bolts feature an 180-degree hook at the end, resembling the letter "J" or an umbrella handle. This hooked section engages with reinforcing steel within concrete to create a mechanical lock. L-bolts feature a 90-degree right-angle bend at the end, resembling the letter "L". Anchoring force is generated through contact between the right-angle section and the concrete.
Performance Differences
J-bolts typically exhibit 20% to 30% higher 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. J-bolts generally possess greater load-bearing capacity and are suitable for heavy-duty structures subjected to substantial loads. L-bolts exhibit superior shear resistance, offering greater stability against horizontal shear forces, though their pull-out resistance is comparatively weaker.
Manufacturing Complexity
Larger-sized J-bolts present greater challenges during heating and bending processes, with manufacturing precision being difficult to control. They are typically recommended for sizes M36 and below. L-bolts are relatively simpler to manufacture, offering broader applicability and enabling production of larger-sized products.
Application Scenarios
J-bolts are primarily employed in heavy-duty construction projects such as high-rise buildings, bridges, and other large-scale infrastructure. They are also used in power transmission towers and chemical steel structures within the power and chemical industries, as well as for anchoring concrete foundations for heavy machinery and large equipment. L-bolts are more suitable for lightweight structures like lampposts, small steel frameworks, and billboards, general machinery installations, and scenarios where machining complexity is a consideration.
Installation Characteristics
Both employ pre-embedded installation methods, requiring placement prior to concrete pouring. The J-bolt's curved hook necessitates coordination with reinforcing bars to enhance anchoring effectiveness, with post-installation positional adjustments being difficult. The L-bolt's right-angle design facilitates relatively simpler positioning during installation, though precise alignment remains essential.
Material Selection
Both share similar materials, typically carbon steel such as Q235, Q345, 35 steel, or 45 steel, or stainless steel like 304 or 316. Surface treatments include hot-dip galvanising, electro-galvanising, and epoxy coating, with strength grades covering 4.8, 6.8, 8.8, and 10.9.
Selection Recommendations
Opt for J-type bolts when high pull-out resistance, substantial load-bearing capacity, heavy-duty structures, or high-vibration environments are required. Select L-type bolts when good shear resistance, simpler fabrication, lower cost, or use in lightweight structures is needed. In practical engineering applications, the appropriate anchor bolt type should be chosen based on a comprehensive assessment of specific load requirements, structural characteristics, and construction conditions.

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.