CONFAST LDC385 3/8 in x 5 in Zinc Plated Concrete Screw - Strong

In this review the CONFAST LDC385 3/8 in x 5 in concrete screw is evaluated for contractors, remodelers and serious DIYers who need a dependable masonry fastener. The bottom line: this screw is for anyone who must anchor heavy items to concrete, brick or block and values a simple, single piece design that installs with common tools. Reviewers found the holding power and build quality suited to demanding jobs like bolting safes or securing wood to brick, while installation speed and the serrated head reduce back-out concerns.

Key Features

• Serrated hex washer head: The serrations bite into the surface to help prevent back-out and keep the fastened item stable over time.
• Single piece design: Ready to install out of the box with no assembly, saving time on job sites and reducing the chances of lost parts.
• Zinc plated carbon steel: Provides a durable finish and corrosion resistance suitable for dry concrete environments.
• Standard ANSI bit compatibility: Uses a common bit standard so installers can rely on familiar tools and predictable engagement.
• Requires 3/8 in drilled hole: Works with carbide tipped bits and a hammer drill for consistent anchoring performance in concrete.

Who It's For

The CONFAST LDC385 is aimed at tradespeople and experienced homeowners who need a robust concrete screw for anchoring heavy fixtures such as safes, shelving, structural brackets or securing wood to masonry. Its single piece construction and standard driver size make it well suited to projects where speed and reliability matter.

Those working in consistently wet or corrosive environments should look for a stainless steel or specialty coated anchor instead, since this product is specified for dry environments. For very fine finish work where a countersunk or flush head is required, alternate fasteners may be preferable.

Pros & Cons

Pros

• Strong holding power for heavy fixtures when installed to specified embedment depth.
• Easy and quick to install thanks to the single piece design and ANSI bit compatibility.
• Serrated hex washer head helps prevent back-out and distributes load across the surface.
• Good value for a 25 per box pack for large projects.

Cons

• Some users report occasional spinning without grip in poor quality or highly cracked concrete, so substrate condition matters.
• Designed for dry environments only, not for prolonged exposure to moisture.

Specifications

Our Verdict

The CONFAST LDC385 3/8 in x 5 in concrete screw is a practical choice for professionals and seasoned DIYers who need a reliable masonry anchor with strong holding characteristics and easy installation. It offers solid value for larger projects, though buyers should ensure the concrete substrate is sound and the installation remains in a dry environment for best results.

Frequently Asked Questions

What drill bit size is required?
A 3/8 in carbide tipped bit is required and a hammer drill is recommended for consistent holes in concrete.

What driver do I need?
Use a 9/16 in nut driver to install the screw into the anchor after drilling the hole.

Can this be used outdoors or in damp areas?
This anchor is zinc plated and intended for dry environments; choose stainless or specially coated anchors for prolonged wet exposure.