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Description
Simpson Strong-Tie HDIA25 Hollow Drop-In Anchor for 1/4-in. Rod (100 Pack)Simpson Strong Tie HDIA25 Description The Simpson Strong Tie Hollow Drop In Anchor (HDIA) is an internally threaded, flush mount expansion anchor designed for use in hollow materials like CMU and hollow core plank, as well as solid base materials such as brick and concrete. Simpson Strong Tie HDIA25 Includes (100) Hollow Drop In Internally Threaded Anchor Simpson Strong Tie HDIA25 Features Suitable for suspending conduit, cable trays, pipe supports,
Simpson Strong-Tie HDIA25 Description
The Simpson Strong-Tie Hollow Drop-In Anchor (HDIA) is an internally threaded, flush-mount expansion anchor designed for use in hollow materials like CMU and hollow-core plank, as well as solid base materials such as brick and concrete.
Simpson Strong-Tie HDIA25 Includes
- (100) Hollow Drop-In Internally Threaded Anchor
Simpson Strong-Tie HDIA25 Features
- Suitable for suspending conduit, cable trays, pipe supports, fire sprinklers, and suspended lighting into concrete
- Expansion design allows anchoring into CMU, hollow-core plank, brick, normal-weight concrete, and lightweight concrete
- Internally threaded anchor allows for easy bolt removal
Simpson Strong-Tie HDIA25 Applications
- Suspending conduit and cable trays
- Pipe supports and fire sprinklers
- Suspended lighting into concrete
Simpson Strong-Tie HDIA25 Installation Overview
- Drill a hole in the base material using the specified diameter carbide drill bit.
- Blow the hole clean using compressed air.
- Insert the HDIA into the hole and tap with a hammer until flush against the surface.
- Using the designated setting tool, drive the anchor to the bottom of the drilled hole.
- Position the fixture, insert the fastener, and tighten.
Simpson Strong-Tie HDIA25 Specifications
| Material | Zamac 3 |
| Length | 3/4" |
| Accepts rod size | 1/4" |
| Drill bit size | 3/8" |
| For Treated Lumber | Yes |
| Quantity | 100 |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
Based on 9 reviews
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Product Reviews
★★★★★ 5
Firm n cool
I am super picky about pillows and I need them firm and cool. This is absolutely amazing. Love it! Better than more expensive pillows I've gotten in the past.
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Reviewed in the United States on December 25, 2025
★★★★★ 5
Great pillow
Love it after I adjusted fluffiness. Pain no more
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Reviewed in the United States on January 30, 2026
★★★★★ 5
Perfect pillow
Size: Queen Size(2 Pack)
It’s a beautiful soft Material, way better than any pillow I’ve ever owned. It’s cool to the touch and remains fluffy and durable. I’ve had it over a month and still love it just as much as day one! The neck support is also very much appreciated! The size is perfect for my pillow cases. All in all a durable, soft Material, comfort pillow! Will buy again!
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Reviewed in the United States on April 11, 2026
★★★★★ 5
Soft, feel cool, Arrived vacuumed package. Put in dryer on cool for 3 Minutes, Fluffed right up!!!
Size: Queen Size(2 Pack)
These pillows arrive air tight, once you open the expand very slowly. I put them in the dryer on cool for about 3 or 4 minutes and they fluffed right up!!! They arrived yesterday evening, I have not used them yet, I will need to remove some of the shredded Memory Foam as it is way to much for me. I will update after a night or two. they are soft to touch and feel cooler if you leave your hand on a for little bit. I'm excited to try them out. Hoping and praying they work for bad necks, backs and shoulders, seems to be Nice quality.
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Reviewed in the United States on March 25, 2026
★★★★★ 5
Really supportive, comfortable pillows, great value.
Size: Queen Size(2 Pack)
When I received these pillows, I followed the directions to fluff them. They were delivered vacuum packed. The first night I slept on them, I didn’t remove any of the filling. That was a problem because the pillows are so over stuffed that it was difficult to sleep on them. I was disappointed until I removed about 1/3 of the filling. Doing so made all of the difference. These pillows are very nice. They keep their shape during the night and provide excellent support for my neck and head. They don’t flatten out or separate like regular shredded foam pillows.
They are well made with an outer cooling cover as well as a inner zippered cover for the foam.
I love the fact that these pillows are adjustable. I saved the foam I removed in the zippered bag the pillows arrived in, in case I needed to restore the foam in the future. They are a very good value for the money.
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Reviewed in the United States on October 25, 2025
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