Product Description
The L-shaped anchor bolt is a pre-embedded fastener featuring a 90° right-angle hook at one end and a fully threaded straight shank at the other. It is primarily used to secure steel structures, equipment, and towers within concrete foundations. Its load-bearing mechanism relies on the right-angle hook anchoring into the concrete, making it suitable for resisting vertical pull forces. However, for resistance to horizontal displacement and strong vibrations, it is recommended to select U-shaped or anchor-claw type anchor bolts.
Basic Product Information
- Product Name: 7-shaped anchor bolt / L-shaped anchor bolt / Right-angle hook anchor bolt
- Standards: GB/T 799-1988 (National Standard); customizable to DIN 64801 and ASTM F1554
- Common Strength Grades: Grade 4.8 / Grade 5.8 / Grade 8.8
- Common Materials: Q235B (Grade 4.8, Economy Grade); Q355B (formerly Q345B, Grade 5.8, High Strength); 35# / 45# Carbon Steel (Grade 8.8, Quenched and Tempered)
- Surface treatment: Natural finish (blackened), electrogalvanized, hot-dip galvanized (heavy-duty corrosion protection)
- Structure: One end fully threaded (for connecting equipment), one end with a 90° right-angle hook (7-shaped) (for embedded anchoring)
Key Product Advantages
- 7-shaped hook for strong anchoring: The L bolt features a right-angle hook design that provides excellent pull-out resistance once embedded in concrete. It effectively withstands upward pull, lateral thrust, vibration, and wind loads, ensuring a secure and stable anchor that will not loosen.
- Simple structure and high cost-effectiveness: Molded as a single piece, it requires no additional accessories and is easy to install. It serves as the primary embedded fastener for medium- and light-duty equipment and steel structure foundations.
- Multiple Materials and Strength Grades for Wide Applicability: Grade 4.8 (Q235B) bolts are suitable for civil buildings and small equipment. Grade 5.8 (Q355B) bolts are suitable for steel structure workshops, transmission towers, and medium-sized machinery. Grade 8.8 (45# steel) bolts are suitable for heavy-duty equipment, high-vibration, and high-load applications.
- Galvanized for corrosion resistance and extended service life: The galvanized coating (especially hot-dip galvanizing) provides rust and corrosion protection, making it suitable for outdoor, humid, and industrial environments, thereby extending service life.
- Customizable to both national standards and non-standard specifications: With a complete range of specifications, we support customization of diameter, length, and hook dimensions according to drawings to meet various engineering requirements.
Typical Applications
- Anchoring steel columns in steel-structured industrial buildings, warehouses, and stadiums
- Anchoring power and telecommunications towers, streetlights, billboards, and solar panel mounts
- Installing equipment bases for machine tools, fans, pumps, compressors, and other machinery
- Embedded anchors for building curtain walls, canopies, and guardrails
- Embedded anchors for bridges, tower cranes, and construction machinery foundations
Table of Common Sizes (GB/T 799 Standard)
Key Parameters (mm)
Legend: d (thread diameter), L (total length), B (horizontal section of the hook; national standard ≈ 7d)
|
Size d |
Pitch P |
Thread length b |
Hook length B ≈7d |
Total length L Common series |
|
M12 |
1.75 |
30–40 |
84 |
300, 400, 500 |
|
M16 |
2.0 |
40–50 |
112 |
400, 500, 600, 700 |
|
M20 |
2.5 |
50–65 |
140 |
500, 600, 700, 800, 1000 |
|
M24 |
3.0 |
60–80 |
168 |
600, 700, 800, 900, 1000, 1200 |
|
M27 |
3.0 |
65–90 |
189 |
700, 800, 900, 1000, 1200, 1500 |
|
M30 |
3.5 |
70–100 |
210 |
800, 900, 1000, 1200, 1500 |
|
M36 |
4.0 |
80–110 |
252 |
1000, 1200, 1500, 1800 |
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