Simpson Strong-Tie THDB62800HMG Titen HD 5/8 in. x 8 in. Mechanically Galvanized Heavy-Duty Concrete and Masonry Screw Anchor is built for anchoring fixtures and structural hardware into concrete and masonry. This is a heavy-duty concrete and masonry screw anchor designed for fastening into concrete, brick, and cinder block. Model Number: THDB62800HMG. For contractors, builders, and serious remodelers, this anchor gives you a strong mechanical connection with a straightforward install process and the ability to remove the anchor if the job calls for it.

The size on this specific anchor is 5/8 in. x 8 in., with a 5/8 in. drill bit diameter, a 15/16 in. wrench size, and a 5-1/2 in. thread length. Those numbers matter because they tell you this anchor is meant for substantial embedment and higher-demand fastening work, not light-duty bracket mounting. The thread design undercuts into the base material to transfer load efficiently, while the serrated tip helps the anchor cut and lowers installation torque. That means quicker setting and less fight during install, especially when you're repeating the same task across multiple anchors.

One of the practical advantages of the Titen HD line is that the hole size matches the anchor size. For this THDB62800HMG, you drill with a 5/8 in. carbide bit and install with a standard 15/16 in. wrench or socket. There is no need for a special oversized bit or oddball installation hardware. On the job, that cuts down on setup mistakes and makes it easier to stock what you actually need. The head is also stamped for identification, which is a small detail until you're sorting anchors on a slab and need to confirm what you're holding.

The anchor is made from carbon steel with a mechanically galvanized finish. Simpson Strong-Tie notes that the coating meets ASTM B695, Class 65, Type 1. In real use, that finish is the reason this anchor makes sense for exterior work where a standard interior-only fastener would be the wrong call. The hex washer head is another useful detail. It eliminates the need for a separate washer in many applications and gives the installed connection a cleaner, tighter bearing surface against the fixture.

This anchor is also designed with jobsite practicality in mind. Installation is simple: drill the hole to the specified embedment depth plus the required overdrill, clean it if needed, insert the anchor through the fixture, and tighten until the hex washer head contacts the fixture. Simpson Strong-Tie specifically cautions that oversized holes in the base material can reduce or eliminate the mechanical interlock of the threads, so fit matters here. They also call out that the anchor is fully removable, which is useful when the job requires temporary bracing, fixture replacement, or hardware adjustment later on.

For use-case fit, this heavy-duty anchor makes sense for post bases, sill plate related applications where the coating is permitted, ledgers, brackets, and other anchored steel or wood fixtures tied into concrete or masonry. The source data also states the Titen HD is qualified for static and seismic loading conditions, which is important for users working from engineered fastening schedules and approved anchoring details. It is not a general-purpose screw for random masonry work. It is a structural-style anchoring product for people who need predictable installation and a high-strength hold.

If you're deciding whether this is the right anchor, the short version is this: buy it when you need a removable heavy-duty concrete screw anchor with exterior-rated mechanical galvanizing and a large 5/8 in. diameter. It is a strong fit for general contractors, deck and post installers, concrete crews, and remodelers fastening structural connectors or heavy fixtures into concrete and masonry. It is not the anchor to reuse repeatedly, and it is not the one to install sloppily with an oversized hole. Installed correctly, it is a fast, clean, heavy-duty anchoring option from a brand that contractors already trust.

Big Anchor, Straightforward Install

The Simpson Strong-Tie THDB62800HMG is the kind of anchor you buy when the connection matters and you do not want to mess around with a lighter-duty fastener.

• Who it's for: Contractors, builders, and remodelers fastening post bases, ledgers, brackets, or other heavy hardware into concrete or masonry.
• Why it stands out: You get a 5/8 in. heavy-duty concrete screw anchor with a mechanically galvanized finish, strong thread design, removable installation, and standard-size bit and wrench requirements.
• Worth knowing: This is a one-time-use anchor, so do not pull it out and run it back in somewhere else expecting the same performance.

• What base materials is this anchor designed for? It is designed for concrete, brick, and cinder block.
• What size drill bit do I need for the THDB62800HMG? Use a 5/8 in. carbide drill bit, which matches the nominal anchor diameter.
• What wrench size fits this anchor? Simpson Strong-Tie lists a 15/16 in. wrench size for this 5/8 in. anchor.
• Can this anchor be removed after installation? Yes. The Titen HD is fully removable, which can be useful for fixture replacement or temporary installations.
• Can I reuse it after removal? No. The source data says to use a Titen HD screw anchor one time only because repeated installation can wear the threads and reduce load capacity.