Backside-Free Setup
Work from the front of the panel when the reverse side is enclosed or hard to reach.
1
/
9
25-Piece Jack Nut Kit for Hollow Walls & Thin Metal
$39.99 USD
-
Free worldwide shipping
-
Free returns
-
Carbon neutral
-
Secure payments
25-Piece Jack Nut Kit for Hollow Walls
Collapsible metal anchors create threaded mounts in thin or hollow materials without backside access. Four sizes available.
Front InstallNo backside access needed.
Four SizesM4, M5, M6 options.
25 PiecesPer set.
Four-Leg Expansion
The metal body opens behind the wall as the screw tightens, creating a broad mechanical grip.
More Ways to Use
Swipe to explore more details →
01 / 03
Reusable Threaded Point
Once properly set, the anchor provides a threaded mounting point for compatible machine screws.
02 / 03
Compact Metal Anchors
Silver-colored metal body with a round flange, internal thread, and four collapsible legs.
03 / 03
Where They Work
Thin hollow sections such as sheet metal, hollow square tube, and suitable board materials with clearance behind the surface.
Specifications
- Sizes
- M4×20, M5×25, M6×25, M0.24 × 1.18 in (6 × 30 mm)
- Quantity
- 25 per set
- Material
- Metal
- Finish
- Silver-colored
Customer reviews
Swipe to read all 4 reviews →
“I needed to add a bracket to a metal cabinet where there was no way to hold a nut on the inside. These made the job straightforward.”
“The sample fit in my sheet-metal test panel exactly the way I expected. I liked being able to check the size before committing to the repair.”
“Sorting the sizes before starting saved me a lot of trial and error. The four-leg body is easy to identify once you have it in hand.”
“I used one for a small hook on a hollow patio post. The flush front looks neat, and I didn’t have to open the post to reach the back.”
Frequently Asked Questions
What is this type of fastener called?
It is commonly called a jack nut, collapsible nut, or hollow-wall threaded anchor. Its metal legs expand behind thin or hollow material as the screw is tightened.
Do I need access to the back of the panel?
No. The anchor is inserted and set from the front, which makes it useful when the reverse side is enclosed.
Which materials can I use it with?
It is intended for suitable thin or hollow materials with clearance behind the surface, including many sheet-metal and hollow-section projects. Always test the hole size and material condition first.
How do I choose between M4, M5, and M6?
Match the thread size and body length to your compatible screw, pre-drilled hole, material thickness, and project requirements. The available sets are M4×20, M5×25, M6×25, and M6×30.
Can I keep tightening for a stronger hold?
No. Tighten only until the anchor is fully set and snug. Overtightening can damage the anchor or the surrounding material.