CONFAST 1/4 in x 3-1/4 in Hex Head Concrete Screw Anchor - Bit

In this review the CONFAST 1/4 in x 3-1/4 in Hex Head Concrete Screw Anchor is judged as a practical choice for contractors, handymen and serious DIYers who need reliable anchoring into concrete, block or brick. The single biggest reason to buy is the included drill bit and engineered screw shape: the box ships with a carbide-size bit intended to match the anchor, which improves holding values and saves time compared with sourcing a separate bit. The review reflects real installation details, drive method and common field tradeoffs.

Key Features

• Bit Included: Each box includes the recommended 3/16 in carbide tip bit so installers avoid mismatched drilling and gain more consistent hold.
• Slotted Hex Head: The hex washer head can be driven with a 5/16 in nut driver for fast, controllable installation with common tools.
• Self-Tapping Threads: The screw taps its own threads in masonry, eliminating the need for a separate anchor sleeve and simplifying installs.
• Diamond Point: The diamond point helps the screw start and reduces driving effort, saving time when fastening into block or brick.
• Carbon Steel Construction: The blue carbon steel finish provides a durable fastener appropriate for dry interior or sheltered exterior masonry applications.
• 3-1/4 in Length: The 3-1/4 in length and 1 in thread engagement are suited to thicker fixtures or applications requiring deeper embedment.

Who It's For

The anchor is best for tradespeople and experienced DIYers mounting fixtures to concrete, block and brick where a hard, direct thread into masonry is needed and conditions remain dry. The included bit and hex head make it practical for jobs where speed and consistency matter, such as installing ledger boards, shelving frames, or equipment bases.

It is not intended for use in wet or corrosive environments without additional protection, and homeowners who only need light-duty anchors for thin drywall or wood might prefer a different fastener. Those who require stainless corrosion resistance for outdoor marine exposure should look elsewhere.

Pros & Cons

Pros

• Included bit improves drilling accuracy and holding performance compared with mismatched bits.
• Hex washer head and 5/16 in nut driver compatibility speed up repetitive installs.
• Self-tapping design removes the need for separate anchor hardware and simplifies workflow.
• Diamond point eases starting and reduces driving torque on masonry.

Cons

• Made from carbon steel and intended for dry environments, so it is not suited for unprotected outdoor or highly corrosive sites.
• Some users report occasional head breakage under extreme torque, so careful driving technique is recommended.

Specifications

Brand	CONFAST
Anchor Diameter	1/4 in
Anchor Length	3-1/4 in
Hole / Bit Diameter	3/16 in (carbide bit)
Drive / Head	Slotted hex washer head, 5/16 in nut driver
Material / Finish	Carbon steel, blue
Thread Length	1 in

Our Verdict

The CONFAST 1/4 in x 3-1/4 in concrete screw anchor is a solid value for contractors and DIYers who need dependable masonry fastening in dry conditions. The included bit, self-tapping threads and hex washer head save time on the job and contribute to consistent anchoring; just be mindful of corrosion limits and use careful driving technique to avoid rare breakage.

Frequently Asked Questions

Do these anchors require a predrilled hole?
Yes, drill a 3/16 in hole in concrete, block or brick using a carbide tipped bit in a hammer drill before driving the screw.

What driver is needed to install them?
Use a 5/16 in nut driver or compatible socket to drive the slotted hex washer head for controlled torque and speed.

Can these be used outdoors?
They are carbon steel with a blue finish and intended for dry environments; for unprotected outdoor or corrosive conditions choose a stainless fastener or add protective measures.