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7-shaped anchors (7-shaped anchor bolts)
The 7-shaped anchor is named because one end of the bolt is bent in a “7” shape. It is one of the most basic types of anchor bolts. Its structure includes a threaded rod body and an L-shaped hook. The hook part is buried in the concrete foundation and connected to the equipment or steel structure through a nut to achieve a stable fixation.
Description
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Product definition and structure
The 7-shaped anchor is named because one end of the bolt is bent in a "7" shape. It is one of the most basic types of anchor bolts. Its structure includes a threaded rod body and an L-shaped hook. The hook part is buried in the concrete foundation and connected to the equipment or steel structure through a nut to achieve a stable fixation.
Core materials and characteristics
Material: Commonly used Q235 ordinary carbon steel (moderate strength, low cost), Q345 low alloy steel (high strength) or 40Cr alloy steel (ultra-high strength), the surface can be galvanized (hot-dip galvanized or electro-galvanized) for corrosion protection.
Features:
- Flexible installation: The hook design enhances the holding force of concrete and is suitable for fixing small and medium-sized equipment;
- Pull-out performance: The mechanical engagement between the hook and the concrete resists upward pulling force;
- Standardization: It complies with national standards such as GB/T 799, and the specifications are optional from M16 to M56.
Functions and applicable scenarios
Functions:
Fix steel structure columns, street lamp bases, and small mechanical equipment;
Bear static loads, such as building frames and billboard brackets.
Scenario:
Municipal engineering (street lamps, traffic signs), light steel structure factories, and household equipment (such as air conditioner outdoor unit brackets).
Installation and maintenance
Installation:
Reserve holes in the concrete foundation, insert the 7-shaped footing and cast;
Tighten the equipment with nuts and adjust the level when installing it.
Maintenance:
Check the tightness of the nuts regularly, and the damaged galvanized layer needs to be repainted for corrosion protection.
Purchase suggestions
Choose materials according to the load: Q235 is suitable for ordinary scenes, Q345 is suitable for high loads (such as bridges);
The length of the hook must meet the requirements of the concrete burial depth (usually 25 times the bolt diameter).
Comparison and selection guide of three major anchors
| Type | 7-shaped anchor | Welding plate anchor | Umbrella handle anchor |
| Core advantages | Standardization, low cost | High load-bearing capacity, vibration resistance | Flexible embedding, economy |
| Applicable load | 1-5 tons | 5-50 tons | 1-3 tons |
| Typical scenarios | Street lights, light steel structures | Bridges, heavy equipment | Temporary buildings, small machinery |
| Installation method | Embedding + nut fastening | Embedding + welding pad | Embedding + nut fastening |
| Corrosion resistance level | Electrogalvanizing (conventional) | Hot-dip galvanizing + painting (high corrosion resistance) | Galvanizing (ordinary) |
Selection suggestions:
Economic needs: Umbrella handle anchors are preferred, taking into account both cost and function;
High stability needs: Welded plate anchors are the first choice for heavy equipment;
Standardized scenarios: 7-shaped anchors are suitable for most conventional fixing needs.
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