Petal-Type Blind Rivet Nuts for Thin Panels
Petal expansion blind rivet nuts create a reusable internal thread in thin sheet metal, hollow panels and cavity structures where installation is possible from only one side. During setting, the slotted sleeve expands behind the panel to form multiple supporting legs and a wider rear bearing area.
- M4, M5, M6 and M8 threads
- One-sided blind installation
- Wide rear-side expansion area
- Carbon steel with zinc finish
- Multiple sleeve lengths available
- Samples, bulk supply and OEM packaging
- Product Type
- Petal-Type Blind Rivet Nuts for Thin Panels
- Thread Sizes
- M4 / M5 / M6 / M8
- Material
- Carbon Steel
- Surface Finish
- Zinc Galvanized
- Sleeve OD Range
- 8–15 mm
- Installation
- One-Sided Blind Setting
- Typical Substrates
- Thin metal, plastic and hollow panels
Designed for Thin and Hollow Substrates
- Creates a reusable female thread in thin panels
- Does not require access to the rear side during installation
- Expanded legs distribute contact over a wider rear-side area
- Useful where conventional nut-and-bolt fastening is impractical
- Suitable for production assembly and maintenance applications
What Are Petal-Type Blind Rivet Nuts?
A petal expansion blind rivet nut is a threaded insert designed to provide an internal metric thread in materials that are too thin, hollow or difficult to access for a conventional nut.
Unlike a standard bolt-and-nut connection, installation takes place entirely from the accessible side of the workpiece. As the insert is set, the slotted sleeve deforms outward behind the panel and forms multiple petal-shaped supporting legs.
This expanded structure increases the contact area on the rear side of the substrate and is particularly useful in thin sheet-metal housings, hollow panels, plastic components, equipment covers, lighting assemblies and other lightweight structures.
DISLAB PRECISION supplies M4, M5, M6 and M8 petal rivet nuts with multiple overall lengths, sleeve lengths and body diameters for international industrial buyers, distributors and OEM sourcing projects.
How Does a Petal Rivet Nut Work?
The insert changes from a narrow sleeve into a broad rear-side support structure during installation.
Insert Into the Hole
Place the rivet nut through the correctly prepared mounting hole from the accessible side of the panel.
Set the Rivet Nut
A compatible installation tool pulls the threaded section toward the flange while the front of the insert remains seated against the panel.
Petals Expand Behind the Panel
The slotted sleeve opens into multiple legs behind the substrate, creating a wider bearing surface and a permanent threaded mounting point.
Petal-Type Blind Rivet Nut Specifications
Available dimensions cover multiple thread sizes and sleeve configurations. Final selection should be based on the actual mounting hole, panel thickness and assembly requirements.
| Parameter | Available Specification | Selection Note |
|---|---|---|
| Thread Size | M4, M5, M6, M8 | Match the mating screw and required assembly size. |
| Nominal Length | 20, 25, 27, 30, 39, 44, 45, 48, 53, 59, 60, 67, 73, 87, 88 mm | Select according to the fastener configuration and substrate. |
| Sleeve Length | 16, 17.5, 20, 21, 32, 37, 38, 46, 52, 60, 65, 80 mm | Must be matched to panel thickness and required expansion geometry. |
| Sleeve Outer Diameter | 8, 10, 12, 14, 15 mm | Confirm the required mounting hole before production. |
| Material | Carbon Steel | Contact us if a specific material specification is required. |
| Surface Treatment | Zinc Galvanized Finish | Suitable finish should be selected according to the service environment. |
| Structural Options | Petal expansion type / hollow-wall tight-locking type | Structure should be selected according to substrate and installation space. |
Important: The values above describe the available dimensional range and should not be interpreted as a one-to-one size combination. Exact thread size, sleeve diameter, length, hole diameter and grip range should be confirmed for the selected model.
How to Choose the Right Petal Rivet Nut
For accurate model selection, do not choose the fastener by thread diameter alone. Several application dimensions should be reviewed together.
Confirm the Mating Screw
Choose M4, M5, M6 or M8 according to the mating screw, assembly layout and fastening requirement.
Measure the Actual Substrate
Provide the sheet or panel thickness so that the sleeve geometry can be matched to the material being fastened.
Match the Mounting Hole
Hole diameter affects seating and installation stability. Provide the existing hole size when replacing another insert.
Identify the Panel Material
Thin steel, aluminum, plastic, composite and hollow panels can behave differently during installation and should be evaluated separately.
Check Available Rear Space
Confirm that the selected sleeve has sufficient room to expand behind the panel without interference from nearby components.
Define the Required Performance
For load-sensitive applications, provide pull-out, torque, vibration or other test requirements before mass production.
Where Are Petal Expansion Rivet Nuts Used?
These blind threaded inserts are mainly selected for thin, hollow or lightweight structures where conventional backside nut access is difficult or impossible.
Construction & Hollow Panels
Suitable for hollow-wall assemblies, decorative panels, lightweight brackets, ceiling-related mounting structures and other applications requiring a reusable threaded connection from one accessible side.
Equipment & Metal Enclosures
Used in electrical cabinets, HVAC casings, equipment covers, sheet-metal housings and similar fabricated assemblies where the sheet is not thick enough for direct threading.
Automotive & Lighting Assemblies
Applicable to selected brackets, lighting housings, lamp assemblies and lightweight metal structures that require blind installation and a detachable screw connection.
Plastic & Composite Panels
The wider rear-side expansion area can be useful for applications involving selected plastic, composite and other lightweight panels. Sample installation is recommended before volume production.
Petal Rivet Nut vs. Standard Blind Rivet Nut
Both products create a threaded connection from one side, but the way they deform behind the panel is different.
| Feature | Petal Expansion Rivet Nut | Conventional Blind Rivet Nut |
|---|---|---|
| Installation Access | One-sided installation | One-sided installation |
| Rear-Side Formation | Slotted sleeve expands into multiple supporting legs | Body typically deforms locally behind the panel |
| Rear Bearing Area | Relatively broad expanded contact area | Depends on body style and deformation design |
| Thin / Hollow Panels | Designed specifically for these applications | Suitability depends on rivet nut type and panel condition |
| Soft or Lightweight Panels | Wide expansion may help distribute contact | Requires careful model selection |
| Selection Requirement | Hole size, thickness and expansion clearance must be checked | Hole size and grip range must be checked |
Fastener performance depends on the exact insert geometry, substrate material, panel thickness, mounting hole and installation setting. Sample validation is recommended for critical applications.
How to Install Petal-Type Blind Rivet Nuts
Correct hole preparation and controlled setting are important for achieving consistent expansion behind the panel.
Recommended Installation Sequence
- Confirm the rivet nut model, thread size and panel thickness.
- Prepare the mounting hole according to the selected product drawing.
- Insert the rivet nut through the hole from the accessible side.
- Connect the insert to a compatible rivet-nut installation tool.
- Apply the appropriate setting movement so the sleeve expands behind the panel.
- Remove the tool and visually inspect the flange and rear-side expansion where accessible.
- Install the mating screw and confirm assembly fit before production release.
Common Installation Problems
- Mounting hole diameter is too large
- Selected sleeve geometry does not match panel thickness
- Insufficient clearance behind the panel
- Incorrect installation tool or mandrel
- Insufficient setting movement
- Excessive setting force or over-compression
- Insert rotates after installation
- Petal legs do not expand evenly
- Mating screw thread does not match the insert
Petal Rivet Nuts for OEM, Distribution and Repeat Production
DISLAB PRECISION supports international industrial buyers sourcing petal expansion rivet nuts, blind threaded inserts and related fastening components.
Projects can begin with specification review and sample verification, followed by mixed-size purchasing, repeat production or bulk supply according to the buyer’s sourcing requirements.
Petal-Type Blind Rivet Nut FAQ
Common questions from industrial buyers about selection, installation and purchasing.
What is a petal expansion blind rivet nut?
What thread sizes are available?
What materials can petal rivet nuts be installed into?
How do I select the correct rivet nut size?
What hole diameter do I need?
Can petal rivet nuts be used in very thin sheet metal?
What is the difference between a petal rivet nut and a standard rivet nut?
Can I order samples before bulk purchasing?
Can DISLAB PRECISION provide custom sizes or OEM packaging?
What information should I send when requesting a quote?
Learn More About Industrial Fasteners
Compare common bolts, nuts, rivets, anchors and other fastening systems in our mechanical fastener selection guide.
Need Help Selecting Petal-Type Blind Rivet Nuts?
Send your application information to DISLAB PRECISION. Providing the key dimensions below helps us review the required configuration more efficiently.