The Simpson HDIA Setting Tool for Solid Material, 5/16 in. x 3/8 in. is a purpose-built installation tool from Simpson designed to properly seat Hollow Drop-In Internally Threaded Anchors in solid base materials. Sized to work with 5/16-inch and 3/8-inch anchors, this setting tool delivers the consistent, high-force seating action needed to fully expand and lock drop-in anchors into solid substrates - helping ensure reliable, long-term holding performance for threaded rod suspension and overhead anchoring applications.

Key Features

• Purpose-built for solid material anchor installation - engineered specifically to set Hollow Drop-In Internally Threaded Anchors in brick, normal-weight concrete, and lightweight concrete, so installers get predictable results across the most common solid overhead substrates.
• Compatible with Simpson anchor models HDIA31, HDIA37, and HDIA37SS - covers both the 5/16-inch and 3/8-inch hollow drop-in anchor sizes, eliminating guesswork when selecting the correct tool for the job.
• Promotes full, uniform anchor expansion - ensures the drop-in anchor expands completely within the base material, creating a secure, load-ready connection that supports suspension systems for electrical, HVAC, fire sprinkler, and similar overhead applications.
• Eliminates the risk of incomplete seating - using a correctly matched setting tool rather than an improvised instrument helps prevent partial expansion that could compromise holding values and long-term anchor performance.

Why This Product

• Exact-fit compatibility across two anchor sizes - a single tool covers Simpson hollow drop-in anchors in both 5/16-inch and 3/8-inch sizes, reducing the number of specialty tools needed on the job site without sacrificing precision.
• Designed for the base materials you actually work in - verified compatibility with brick, normal-weight concrete, and lightweight concrete means this tool is suited to the full range of solid overhead substrates found in commercial and industrial construction.
• Protects installation integrity where it matters most - overhead suspension anchors for cable trays, HVAC hangers, fire sprinkler pipe, and similar systems carry real load and safety responsibilities; a dedicated setting tool helps ensure each anchor is fully set before any load is applied.
• Straightforward, single-purpose reliability - built to do one job correctly, this tool removes variables from the anchor installation process and supports consistent results across multiple anchors and multiple installers on the same project.

Specifications

• Model Number: HDIASTS31-37
• Size (in.): 5/16 - 3/8
• Compatible Anchor Models: HDIA31, HDIA37, HDIA37SS
• Base Material Compatibility: Brick, normal-weight concrete, lightweight concrete
• Packaging: Packs of 1 and Cartons of 50

Approved Applications

• Setting drop-in anchors in solid concrete and masonry for threaded rod suspension systems
• Suspending electrical cable trays from overhead concrete or brick structures
• Installing HVAC ductwork hangers and support rods in solid-material ceilings
• Anchoring fire sprinkler pipe and sprinkler head assemblies in solid substrate applications

Frequently Asked Questions

Which anchor models is the HDIASTS31-37 setting tool compatible with?

This setting tool is specifically designed for use with Simpson Hollow Drop-In Anchor models HDIA31, HDIA37, and HDIA37SS, covering the 5/16-inch and 3/8-inch anchor size range.

What base materials can this setting tool be used in?

The HDIASTS31-37 is designed for use in solid materials, including brick, normal-weight concrete, and lightweight concrete. It is not intended for use in hollow or cavity-type base materials.

What is the purpose of using a dedicated setting tool rather than improvising with another instrument?

Using the correct setting tool ensures that the hollow drop-in anchor expands fully and uniformly within the base material, strongly reinforcing the anchor to create a secure, load-ready connection. Improvised tools may result in incomplete expansion and compromised holding values.

What types of suspension systems is this tool commonly used for?

This setting tool supports installations where threaded rod is used to suspend systems such as electrical cable trays, HVAC ductwork, and fire sprinkler pipe and sprinkler heads from solid overhead substrates like concrete or brick.

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