The Simpson Titen HD 1/4 in. x 1-7/8 in. Countersunk Head Heavy-Duty Screw Anchor is a high-performance concrete and masonry screw anchor engineered for demanding structural and general anchoring applications in dry, interior, noncorrosive environments or temporary outdoor use. Built from zinc-plated carbon steel, this screw anchor delivers reliable holding power in both cracked and uncracked concrete as well as masonry substrates, and is qualified for use in seismic and wind-governed conditions. The countersunk head style enables a flush-mount profile that keeps surfaces clean and unobstructed - making it the right choice when a hex head anchor simply will not work.

Key Features

• Qualified for static and seismic loading conditions - gives you confidence that the anchor meets structural performance requirements even in demanding, code-driven applications.
• Hole size matches anchor size (1/4 in.) - no oversized hole needed, which simplifies layout, reduces prep time, and produces a tighter, more secure connection.
• No special drill bit required - works with standard-sized ANSI tolerance drill bits you already own, cutting down on tool costs and setup.
• Removable after installation - ideal for temporary anchoring or situations where fixtures may need to be repositioned or replaced without sacrificing the base material.
• T30 6-lobe drive - reduces driver-bit cam-outs compared to traditional recessed anchor heads, resulting in faster, less frustrating installation.
• Countersunk head design - allows flush-mount and exposed through-set installations where a low-profile surface appearance is required and a hex head is not an option.
• Serrated teeth on the anchor tip - facilitate cutting into concrete or masonry and actively reduce the torque needed to drive the anchor, easing installation.
• Zinc-plated finish - suitable for dry, interior, noncorrosive environments or temporary outdoor use; a Type 316 stainless-steel version is available for applications requiring long-term corrosion resistance.
• Driver bit included in each box - means you can get to work immediately without sourcing additional tooling.

Why This Product

• Seismic and wind qualification built in - unlike basic concrete fasteners, this anchor is tested and qualified for static and seismic loading, making it a dependable choice for structural anchoring where performance standards matter.
• Flush-mount capability opens up more applications - the countersunk head sits flush with the fixture surface, allowing clean, low-profile installations in exposed through-set and surface-mount scenarios that a standard hex head anchor cannot accommodate.
• Simplified installation from start to finish - standard ANSI drill bits, a hole size that matches the anchor diameter, serrated cutting teeth, and an included driver bit all work together to reduce installation time and effort on the job site.
• Removability adds long-term flexibility - because the Titen HD screw anchor can be removed after installation, it suits temporary anchoring jobs, adjustable fixture layouts, and phased construction projects where permanence is not required.

Specifications

• Model No.: THDB25178CS
• Brand: Simpson Strong-Tie
• Anchor Size: 1/4 in. x 1-7/8 in.
• Diameter: 1/4 in.
• Head Type: Countersunk Head
• Head Diameter: 1/4 in.
• Drive Type: T30 6-Lobe
• Material: Carbon Steel
• Coating/Finish: Zinc Plated
• Recommended Fixture Hole Size: 3/8 in. to 7/16 in.

Approved Applications

• Anchoring into cracked and uncracked concrete
• Anchoring into masonry substrates
• Dry, interior, noncorrosive environments
• Temporary outdoor anchoring applications
• Flush-mount and exposed through-set installations requiring a low-profile countersunk head
• Seismic and wind-governed structural applications

What's Included

Each pack contains (100) Countersunk Titen HD Anchors, Driver bit included in each box.

Frequently Asked Questions

Do I need a special drill bit to install the Titen HD THDB25178CS anchor?

No special drill bit is required. The Titen HD is designed to install using standard-sized ANSI tolerance drill bits. The hole size is the same as the anchor size - 1/4 in. - so no oversized or specialty bit is needed.

Can the Titen HD countersunk anchor be used outdoors or in corrosive environments?

The THDB25178CS is zinc plated carbon steel and is not recommended for permanent exterior use or highly corrosive environments. It is designed for dry, interior, noncorrosive environments or temporary outdoor applications only. For long-lasting corrosion resistance, a Type 316 stainless-steel Titen HD option is available.

Is the Titen HD screw anchor removable after installation?

Yes. The Titen HD is removable, making it ideal for temporary anchoring or applications where fixtures may need to be repositioned or removed at a later time.

Why does the Titen HD use a countersunk head instead of a hex head?

The countersunk head style allows for flush-mount applications that are not possible with a hex head. This design leaves a cleaner surface appearance for exposed through-set applications and accommodates situations where a low-profile or flush finish is required. The T30 6-lobe drive further eases installation and is less prone to stripping than traditional recessed anchor heads.

Note: Product dimensions and/or thread length may differ from picture. Please refer to the item description and specifications above for accurate details.