Product Features
Product Description
The Simpson Strong-Tie HDIA31 Hollow Drop-In Internally Threaded Expansion Anchor is an internally threaded, flush-mount expansion anchor engineered for attaching threaded rod to support conduit, cables, and lighting. Manufactured by Simpson Strong-Tie, this anchor is uniquely designed to perform in both hollow base materials - such as CMU and hollow-core plank - and solid base materials including brick, normal-weight concrete, and lightweight concrete, making it one of the most versatile drop-in anchors available for overhead suspension applications.
Key Features
- Suitable for suspending conduit, cable trays, pipe supports, fire sprinklers and suspended lighting into concrete
- Expansion design allows HDIA to anchor into CMU, hollow-core plank, brick, normal-weight concrete and lightweight concrete
- Internally threaded anchor allows for easy bolt removal
- Flush-mount design installs cleanly without protruding above the surface
- Die-cast Zamac 3 alloy shell with carbon-steel cone for durable, reliable performance
- Compatible with both hollow and solid base materials - one anchor for multiple substrate types
- Can be installed with a dedicated setting tool for proper seating in hollow or solid materials
Specifications
- Manufacturer: Simpson Strong-Tie
- MPN: HDIA31
- Rod / Bolt Diameter: 5/16 in.
- Threads Per Inch (TPI): 18
- Length: 1-1/4 in.
- Drill Bit Diameter: 5/8 in.
- Shell Material: Die-cast Zamac 3 alloy
- Cone Material: Carbon steel
- Packaging: Packs of 50 and Cartons of 200
- Country of Origin: China
Approved Applications
- Suspending conduit and conduit supports from concrete ceilings or walls
- Attaching cable trays to hollow-core plank or CMU substrates
- Installing pipe supports and fire sprinkler systems in concrete overhead structures
- Mounting suspended lighting fixtures to normal-weight and lightweight concrete
- General threaded rod attachment in brick, CMU, hollow-core plank, normal-weight concrete, and lightweight concrete
Frequently Asked Questions
- What base materials is the Simpson HDIA31 anchor compatible with?
- The HDIA31 is designed for use in both hollow and solid base materials. It anchors effectively into CMU, hollow-core plank, brick, normal-weight concrete, and lightweight concrete, making it a highly versatile choice for a wide range of construction substrates.
- What rod or bolt size does the HDIA31 accept?
- The HDIA31 accepts a 5/16-inch diameter threaded rod with 18 threads per inch (TPI). A 5/8-inch drill bit is required to create the pilot hole for installation.
- What setting tools are required to install the HDIA31?
- Installation requires a dedicated setting tool. Use the HDIASTH31 setting tool for hollow materials such as CMU and hollow-core plank, or the HDIASTS31-37 setting tool for solid materials such as brick and concrete.
- Can the bolt or rod be removed after the HDIA31 anchor is set?
- Yes. Because the HDIA31 is internally threaded, the threaded rod or bolt can be removed and reinserted as needed without disturbing the installed anchor shell. This makes it easier to adjust or service suspended systems after installation.
Note: Product dimensions may differ from picture. Please see the item description above for specifications.
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