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Description
Simpson Strong-Tie HDIA31 (5/16") Hollow Drop-In Anchor for 5/16" Rod (50 Pack)Simpson Strong Tie HDIA31 Description The Simpson Strong Tie Hollow Drop In Anchor (HDIA) is an internally threaded, flush mount expansion anchor designed for use in hollow materials such as CMU and hollow core plank, as well as in solid base materials like brick and concrete. Simpson Strong Tie HDIA31 Includes (50) Hollow Drop In Internally Threaded Anchors Simpson Strong Tie HDIA31 Features Suitable for suspending conduit, cable trays, pipe
Simpson Strong-Tie HDIA31 Description
The Simpson Strong-Tie Hollow Drop-In Anchor (HDIA) is an internally threaded, flush-mount expansion anchor designed for use in hollow materials such as CMU and hollow-core plank, as well as in solid base materials like brick and concrete.
Simpson Strong-Tie HDIA31 Includes
- (50) Hollow Drop-In Internally Threaded Anchors
Simpson Strong-Tie HDIA31 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 HDIA31 Applications
- Suspending conduit and cable trays
- Pipe supports and fire sprinklers
- Suspended lighting into concrete
Simpson Strong-Tie HDIA31 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 HDIA31 Specifications
| Material | Zamac 3 |
| Length | 1-1/4" |
| Accepts rod size | 5/16" |
| Drill bit size | 5/8" |
| For Treated Lumber | Yes |
| Quantity | 50 |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
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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 17 reviews
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Product Reviews
★★★★★ 5
Amazing bag
Color: Black
Omg this is seriously the cutest bag. I purchased the black so classy looking and I love that you can carry It 3 different way. It looks like an expensive bag. Can’t wait to use It at some weddings as a clutch and then a cross body or shoulder bag other days. . It has card slots in It which is so good when you don’t want to carry a wallet. I did put a small wallet my phone and lip gloss and keys and still have room.
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Reviewed in the United States on August 28, 2025
★★★★★ 3
Nice bag
Not a bad bag just not my favorite. Looks different once it came in the mail and the quality wasn’t as nice but still very spacious. It’s a nice daily bag but not what I had needed.
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Reviewed in the United States on June 19, 2025
★★★★★ 5
Love!
Color: Silver
Very cute clutch! Perfect for a wedding
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Reviewed in the United States on February 28, 2026
★★★★★ 5
Cute great size got a lot of compliments
Color: Obsidian Black
Loved this. Got it on sale dor 34.99 and worth it it seems like a good staple for events / outtings. Even daily use probably, but I got it for a wedding event.weekend and got so many compliments!
Good closure zipper had no issues.
I like the material doesn’t look or feel cheap, good color. (I got black) but saw someone at event with gold one and also adorable!!!
Storage is huge for me - it easily fit my phone, a couple of pads and tampons, small hand sanitizer, small aquaphor with room! I also had sunglasses in there at one point and surprisingly zipped fine with all of that.
Overall convenient for storage, aesthetically pleasing, good material-quality.
Cons: the chain strap bothered my neck a little bit after wearing it but that’s a me problem. Not the purse/way it was made. But something to consider.
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Reviewed in the United States on April 4, 2026
★★★★★ 5
Cute and versatile clutch purse
Color: Apricot Beige
Very nicely made, can use as a clutch, a shoulder or the chain can be doubled and makes a great little purse, roomy and closes with a zipper so you don't lose things like I do. Will probably get more in different colors, soft leathery material.
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Reviewed in the United States on April 15, 2026