The Simpson Strong-Tie Titen HD 3/8-in. x 5-in. Zinc-Plated Countersunk Head Heavy-Duty Screw Anchor, 50-Pack (THD37500CS) is a concrete screw anchor made for fastening fixtures where a flush surface matters. This is a heavy-duty screw anchor designed for flush-mount anchoring in concrete and similar base materials for interior or temporary outdoor use. Model Number: THD37500CS. If you are setting brackets, frames, or other steel hardware and do not want a raised hex head sticking up, this countersunk version solves that problem cleanly.

What makes this anchor practical on the job is that the hole size matches the anchor diameter. For this 3/8 inch model, you use a 3/8 inch carbide drill bit, so there is no oddball sizing to track down. Simpson also calls out that no special drill bit is required, which keeps installs simple when you are working out of a standard concrete fastening setup. The 5 inch length gives you a longer heavy-duty anchor option when the fixture and embedment demands call for more reach.

The countersunk head is the main reason to choose this version over a hex-head concrete anchor. It allows a flush-mount profile, which is useful on through-set applications where the hardware needs to sit flat against the fixture or where appearance matters on exposed work. On door frames, brackets, and similar metal attachments, that cleaner finish can save time and hassle compared to trying to work around a proud fastener head.

Installation is also more user-friendly than a lot of concrete anchors in this class. The T50 6-lobe drive is there for a reason: it helps reduce driver-bit cam-out and makes the anchor easier to drive consistently. Tool Nut customers who install anchors regularly know that stripped heads waste time fast. A better drive interface means better control, especially when you are driving multiple anchors into concrete in sequence.

This Titen HD anchor is also removable, which is a big advantage in temporary anchoring or applications where fixtures may need to be moved later. That is not something every heavy-duty concrete anchor does well. If the job may change, or if you are setting hardware that could need repositioning, that removability gives you options without switching to a completely different fastening system.

Material and environment matter here. This version is zinc-plated carbon steel, and Simpson positions it for dry, interior, noncorrosive environments or temporary outdoor applications. In plain terms, this is the right version for indoor concrete fastening, not for long-term exposure in highly corrosive conditions. If corrosion resistance is the priority, Simpson offers a Type 316 stainless version in the same family, but this THD37500CS is the cost-effective pick for interior work.

Performance-wise, the Titen HD family is tested in accordance with ACI 355.2, AC193, and AC106, and it is qualified for static, wind, and seismic loading conditions. That matters because these are not just generic masonry screws. They are engineered anchors intended for serious anchoring work where load performance and code-related testing matter. Simpson also notes serrated teeth on the tip to help cutting action and reduce installation torque, which helps the anchor start and drive more efficiently in concrete.

This anchor makes the most sense for contractors and serious DIY users doing mechanical, electrical, plumbing, door-frame, bracket, and general concrete fastening work. If you need a 3/8 inch heavy-duty screw anchor with a flush countersunk head, straightforward drilling requirements, and removable installation, the THD37500CS is a very practical choice. Just keep in mind the environment it is meant for and the one-time-use guidance from Simpson for maintaining rated performance.

Simpson Strong-Tie Titen HD 3/8-in. x 5-in. Zinc-Plated Countersunk Head Heavy-Duty Screw Anchor for Clean Concrete Fastening

This is the one to grab when you need heavy-duty concrete anchoring but cannot have a raised head getting in the way of the finished install.

• Who it's for: Contractors, installers, and serious DIY users fastening brackets, frames, and similar hardware into concrete in dry interior spaces.
• Why it stands out: The flush countersunk head, T50 6-lobe drive, and standard 3/8 inch drill-bit requirement make it easier to install cleanly than a lot of heavier concrete anchors.
• Worth knowing: This zinc-plated carbon steel version is meant for dry, noncorrosive environments or temporary outdoor use, and Simpson says to use the anchor one time only.

• What drill bit size do I need for the THD37500CS? Use a 3/8 in. carbide drill bit. The required hole size matches the anchor diameter.
• Is this anchor removable? Yes. Simpson states that the Titen HD countersunk head style is removable, which makes it useful for temporary anchoring or fixtures that may need to be moved.
• Can this zinc-plated anchor be used outdoors? It is intended for dry, interior, noncorrosive environments or temporary outdoor applications. It is not recommended for permanent exterior use or highly corrosive environments.
• What size fixture hole is recommended? For this 3/8 in. model, Simpson lists a recommended fixture hole size of 1/2 in. to 9/16 in.