7-shaped L-shaped embedded anchor bolts, steel hot-dip galvanized/zinc 8.8 grade

Product Specification

7-shaped L-shaped embedded anchor bolts, steel hot-dip galvanized/zinc 8.8 grade M8-M30

1,Description:

When mechanical components are installed on a concrete foundation, the J-shaped or L-shaped end of this type of bolt is embedded in the concrete for use.

The tensile capacity of anchor bolts is the tensile capacity of the round steel itself. The size is equal to the cross-sectional area multiplied by the allowable stress value (Q235B:140MPa, 16Mn or Q345:170MPA), which is the allowable tensile bearing capacity at the time of design.

Anchor bolts are generally made of Q235 steel, which is smooth and round. Threaded steel (Q345) has high strength, and the threads used to make nuts are not as easy as those made of smooth round steel. For round anchor bolts, the burial depth is generally 25 times their diameter, and then a 90-degree bend hook about 120mm long is made. If the diameter of the bolt is very large (such as 45mm) and the burial depth is too deep, a square plate can be welded at the end of the bolt, that is, a large end will do (but there are certain requirements). Both the burial depth and the bent hook are designed to ensure the friction between the bolt and the foundation, preventing the bolt from being pulled out and damaged.

Anchor bolts can be classified into fixed anchor bolts, movable anchor bolts, expansion anchor bolts and adhesive grounding anchor bolts. Among them, according to different shapes, they are classified as: L-shaped embedded bolts, 9-shaped embedded bolts, U-shaped embedded bolts, welded embedded bolts, and base plate embedded bolts.

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.

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.