The Heavy Duty Shield Anchor (widely recognized in the industry as the “Rawlbolt” type or “Loose Bolt Anchor”) is the ultimate mechanical fastener for securing critical loads to concrete and solid masonry. Unlike lightweight sleeve anchors, the Heavy Duty Shield Anchor features a thick, segmented metal expansion shield that provides immense friction grip against the hole walls, making it the standard choice for anchoring steel columns, heavy machinery, and barrier rails.

Product Overview: Our Heavy Duty Shield Anchor is engineered from high-grade Carbon Steel and finished with Yellow Zinc Plating (Passivated) for superior corrosion resistance in industrial environments. This specific “Loose Bolt” variant allows the hex bolt to be removed after the shield has been set, permitting the fixture to be detached for maintenance or replacement without destroying the anchor point.

Heavy Duty Shield Anchor Specifications

Product Name	Heavy Duty Shield Anchor / Rawlbolt / Loose Bolt Anchor
Anchor Type	Loose Bolt (Hex Head Bolt + Washer + Shield)
Material	Carbon Steel (Grade 4.8 / 8.8)
Finish	Yellow Zinc Plated (High Corrosion Resistance)
Substrate	Non-Cracked Concrete, Natural Stone, Solid Brick

Engineering Insight: Loose Bolt vs. Projecting Bolt

Choosing the correct version of the Heavy Duty Shield Anchor is crucial for your project workflow:

Loose Bolt Type (This Product): The bolt can be completely unscrewed. The expansion shield stays in the hole.
Best for: Machinery that might need to be moved for servicing, or heavy items where you want to install the anchor first and then lift the item into place.
Projecting Bolt Type (Stud): A threaded stud sticks out of the wall permanently.
Best for: Hanging items where you need to “hang” the object on the stud before tightening the nut.

For more details on heavy-duty anchoring principles, please refer to the Anchor bolt entry on Wikipedia.

Installation Guide

Drill: Drill a hole of the specified diameter (e.g., 16mm hole for M10 anchor) into the concrete.
Clean: Thoroughly remove dust and debris from the hole.
Insert: Insert the shield assembly into the hole. For Loose Bolt types, you can remove the bolt, place your fixture, and then re-insert the bolt through the fixture into the shield.
Tighten: Tighten the hex bolt. This pulls the tapered wedge nut up into the shield, forcing the segments to expand and bite into the concrete.

Frequently Asked Questions (FAQ)

Q: Can I use this in hollow block?
A: No. The expansion force of a Heavy Duty Shield Anchor is so powerful it will crack hollow blocks. For hollow materials, use our Hollow Wall Anchors or Chemical Anchors.

Q: What is the benefit of Yellow Zinc?
A: Yellow Zinc (Zinc Dichromate) is a passivation process applied over the zinc plating. It offers better corrosion protection than standard “Blue/White” zinc, making it suitable for damp basements or industrial warehouses.