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

In this review of the CONFAST 3/8 in x 3 in Zinc Plated Concrete Screw, the bottom line is simple: this box of 25 anchors is best for DIYers and contractors who need a straightforward, ready-to-install fastener for concrete, brick or block. The reviewer found the anchors reliable when installed to the specified depth and praised the low torque threads that make driving easier with a standard bit. The single piece, serrated hex washer head design gives predictable holding power for common anchoring tasks such as securing framing, fixtures or a safe to masonry surfaces.

Key Features

• Self-cutting threads: The screw cuts its own thread into properly drilled concrete holes, eliminating the need for inserts and speeding installation.
• Low torque threads: These threads reduce driving effort so a standard bit and a 9/16 in nut driver can install anchors without excessive strain on tools.
• Serrated hex washer head: The serrated head resists back-out and helps the fastener clamp the attached material tightly to the masonry surface.
• Single piece design: No assembly is required, so each screw is ready to install straight from the box for consistent results job after job.
• Bit size matches diameter: Use a carbide tipped 3/8 in bit in a hammer drill to produce the correct hole diameter and improve anchoring reliability.

Who It's For

The CONFAST concrete screw is well suited for homeowners, repair professionals and light commercial contractors who mount items to concrete, brick or block and want an uncomplicated anchor that installs quickly. It is particularly handy for tasks like securing wood to masonry, fixing shelving brackets, or bolting down hardware where a serrated head and zinc plating are adequate.

Those who need stainless corrosion resistance for outdoor or wet environments, or who require specialized heavy structural anchors with certified load tables, should look elsewhere. Also, success depends on proper hole drilling and embedment; users unfamiliar with hammer drilling or correct depth should review installation guidance before starting.

Pros & Cons

Pros

• Good holding power when installed to the minimum embedment, offering secure anchoring for many interior masonry jobs.
• Easy installation thanks to low torque threads and single piece construction, saving time on repetitive installs.
• Serrated hex washer head prevents back-out and sits flush to clamp materials effectively.
• Value for money in a 25 per box quantity for routine projects.

Cons

• Zinc plating is suitable for dry environments only; not intended for prolonged wet or corrosive conditions.
• Some users report occasional anchors that spin if the hole or embedment is not correct, so careful drilling is required.

Specifications

Brand	CONFAST
Diameter	3/8 in
Length	3 in
Material / Finish	Carbon steel, zinc plated
Head style	Hex washer serrated head
Hole / bit diameter	3/8 in carbide tipped bit
Minimum embedment	1-1/2 in into concrete

Our Verdict

The CONFAST 3/8 in x 3 in concrete screw is a practical, cost-effective anchor for indoor masonry work where zinc plating and straightforward installation meet requirements. Buy it if you need reliable holding power for fixtures and light structural attachments and will follow the specified drilling and embedment; skip it for outdoor wet environments or where stainless anchors are required.

Frequently Asked Questions

What drill bit do I need?
Use a 3/8 in carbide tipped bit in a hammer drill to produce the correct hole diameter for these anchors.

How deep should the hole be?
Drill deep enough to allow a minimum embedment of 1-1/2 in of the anchor into the concrete.

Can these be used outdoors?
They are zinc plated and intended for dry environments; choose stainless anchors for long-term outdoor or wet use.