CONFAST 5/8 in x 3-1/2 in Stainless Steel Wedge Anchor - Corrosion

In this review the CONFAST 5/8 in x 3-1/2 in Stainless Steel Wedge Anchor is judged as a no-nonsense anchor for concrete applications where corrosion resistance matters. Installed with the provided nut and washer, this anchor is aimed at contractors, HVAC installers and DIYers who need a durable mechanical anchor for wet environments. The single biggest reason to buy is its 304 stainless steel construction, which means it can be used in wet or submerged settings without rusting and provides long-term reliability when fastening to concrete.

Key Features

• 304 Stainless Steel Construction: Resists corrosion in wet and submerged environments so fittings remain secure over time.
• Packaged with Nut and Washer: Includes the hardware needed for a complete installation, saving trips for additional parts.
• Hole Size Matches Anchor Size: Uses a 5/8 in hole for straightforward layout and drilling with standard carbide bits.
• Designed for Concrete Only: Provides reliable expansion performance when installed to the specified embedment in concrete base material.
• Wide Range of Sizes: Available sizes help ensure the installer can choose the proper anchor length and diameter for their load and embedment.

Who It's For

This anchor is a solid pick for professionals and competent DIYers who frequently mount equipment to concrete, such as HVAC units, railings, machinery bases, and outdoor fixtures where exposure to moisture is expected. The stainless construction is particularly useful for coastal projects or applications near pools and water features.

It is not for use in hollow block or brick base material; installers who need anchors for masonry with voids should choose an anchor specifically rated for that substrate. Also, those who require specialized load calculations should consult engineering guidance rather than relying on a general-purpose wedge anchor.

Pros & Cons

Pros

• High corrosion resistance from 304 stainless steel improves longevity in wet environments.
• Complete package with nut and washer enables fast, one-stop installation.
• Simple installation logic since the hole diameter equals the anchor diameter.
• Customers report good value and consistent anchoring ability for common tasks like mounting gazebos and mini splits.

Cons

• Limited to use in concrete only; not suitable for brick or hollow block installations.
• Sold in a small box quantity of five, which may require multiple boxes for larger projects.

Specifications

Anchor Diameter	5/8 in
Anchor Length	3-1/2 in
Thread Length	1-1/2 in
Minimum Embedment	2-3/4 in
Hole Diameter/Bit	5/8 in carbide tipped bit, hammer drill recommended
Material	304 Stainless Steel
Package Quantity	5 per box (with nut and washer)

Our Verdict

The CONFAST 5/8 in x 3-1/2 in wedge anchor is a practical, corrosion-resistant choice for fastening into concrete where exposure to moisture is a concern. It offers easy installation, included hardware, and solid construction, making it good value for contractors and homeowners mounting outdoor or wet-environment equipment.

Frequently Asked Questions

Can this anchor be used in wet or submerged conditions?
Yes, the anchor is made from 304 stainless steel and is intended for wet environments, resisting rust and corrosion.

What base material is this anchor designed for?
This wedge anchor is designed for concrete only and should not be used in block or brick base material.

What drill bit size and embedment are required?
Drill a 5/8 in hole with a carbide tipped bit in a hammer drill and ensure a minimum embedment of 2-3/4 in into the concrete.