The Simpson Strong-Tie THDC25238H6SS Titen HD Heavy-Duty Screw Anchor is a 1/4 in. x 2-3/8 in. stainless-steel concrete and masonry anchor sold in a 50-pack. This is a heavy-duty screw anchor designed for fastening fixtures to concrete and masonry in corrosive environments. Model Number: THDC25238H6SS. If you need a concrete anchor that installs quickly but still makes sense for exterior exposure, saltwater conditions, or chemical-heavy areas, this is the version of the Titen HD line you want to look at.

What separates this anchor from a generic masonry fastener is the way it installs and holds. The Titen HD uses a self-undercutting thread design that taps into the base material as it goes in, helping transfer load efficiently into the concrete or masonry. In practical terms, that means you get a secure mechanical connection without needing a separate expansion step. It also installs with a standard-size ANSI tolerance carbide drill bit, so you are not chasing a specialty bit just to get started.

For this specific THDC25238H6SS size, the anchor measures 1/4 inch in diameter and 2-3/8 inches in length, uses a 1/4 inch drill bit, and takes a 3/8 inch wrench size. The recommended steel fixture hole size is 3/8 inch to 7/16 inch. Those details matter because they tell you exactly how this anchor fits into field work: small enough for lighter attachment points and brackets, but still part of a heavy-duty anchor family meant for real fastening into concrete and masonry, not light-duty plastic anchor jobs.

The material is a big part of the value here. Simpson Strong-Tie specifies Type 316 stainless steel for this model, which is the better choice when you are working near saltwater or around corrosive chemicals. That is different from buying a standard plated anchor and hoping it survives. On jobs where corrosion is the failure point, not just initial holding strength, material selection is the job. This anchor is built with that in mind.

The design details are practical too. The patented thread includes serrated cutting teeth for installation into the base material, and the hex-washer head gives you built-in bearing surface without adding a separate washer. That means a cleaner install and fewer loose parts to manage on site. Simpson also notes reduced expansion behavior compared with typical expansion-style anchors, which can matter when you are working near edges or in applications where you want the anchor to cut in rather than wedge outward.

On the job, this anchor is aimed at contractors doing mechanical, electrical, and plumbing work, along with exterior structural attachments where stainless hardware is required. Typical use cases include exterior fastening, corrosive environments, saltwater-adjacent installs, and anchoring fixtures like ledgers, railing posts, and similar hardware into concrete. The product data also notes it is qualified for static and seismic loading conditions, which is important for buyers who need an anchor from a recognized engineered product line rather than a commodity fastener.

Installation is straightforward: drill the hole using the same diameter as the nominal anchor diameter, clean the hole as required, insert the anchor through the fixture, and tighten until the hex-washer head contacts the fixture. It can be installed with an impact wrench or by hand tool, though Simpson specifically cautions not to use impact wrenches when installing into hollow concrete masonry units. They also make it clear this is a one-time-use anchor. Pull it out and reinstall it, and you are asking worn threads to do a job they were not meant to do.

Who should buy this? Contractors and serious DIY users who know they need a stainless concrete anchor, not just any masonry fastener. If the job is indoors and dry, this may be more anchor than you need. If the job is outside, exposed, wet, coastal, or chemical-prone, the Simpson Strong-Tie THDC25238H6SS Titen HD Heavy-Duty Screw Anchor earns its keep by giving you faster installation than many traditional anchor setups and better long-term corrosion resistance than standard steel options.

Simpson Strong-Tie THDC25238H6SS Titen HD Heavy-Duty Screw Anchor for jobs where cheap anchors quit early

This is the anchor you buy when the environment is the problem as much as the load.

• Who it's for: Pros and serious DIY users fastening ledgers, brackets, rails, and MEP hardware to concrete or masonry in wet, coastal, or chemical-prone conditions.
• Why it stands out: Type 316 stainless steel, a proven Titen HD thread design, and straightforward installation with standard hole sizing make it a practical upgrade over ordinary masonry anchors.
• Worth knowing: This is a one-time-use anchor, and it is sold as a 50-pack. Great for real exterior work, but probably overkill for a dry interior job.

• What base materials is this anchor designed for? It is designed for concrete and masonry applications.
• What size drill bit does the THDC25238H6SS require? This model uses a 1/4 inch drill bit, which matches the anchor diameter.
• Can this anchor be used in corrosive or saltwater environments? Yes. The Type 316 stainless-steel construction is intended for corrosive environments, including saltwater exposure and areas with corrosive chemicals.
• Can the anchor be reused? No. Simpson states Titen HD screw anchors are one-time-use only because repeated installation can wear the threads and reduce load capacity.