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Uncompromising Grip: The Petal Nut Advantage
The Petal Nut Expansion Fastener, widely known in the industry as the Jack Nut, is a high-specialty fastener designed to solve the most difficult mounting challenges in thin materials. Unlike traditional rivet nuts that expand into a solid cylinder, the Petal Nut features a body that splits into four distinct legs when tightened. This “spider-like” expansion creates a massive footprint on the backside of the substrate, distributing the load over a wide area. As a leading Fastener Manufacturer, Youjia Metals has optimized this geometry to prevent the tearing of soft materials like plastics, composites, and thin-gauge sheet metal.
Our Jack Nuts are engineered for precision and durability. In Automotive trim assembly, marine hardware mounting, and industrial enclosures, the requirement for a fastener that remains secure under vibration is paramount. The unique design of these Expansion Fasteners ensures that once the “petals” are fully engaged, the nut becomes permanently anchored, providing a high-torque internal thread for secondary bolt assembly. Our facility utilizes Tight Tolerance Metal Stamping to produce the slotted sleeves, ensuring each leg collapses at the exact calculated pressure every time.
For B2B procurement, sourcing a reliable Petal Nut means more than just finding a cheap part. It requires a Fastener Supplier that understands material grain flow and heat treatment. We use premium C1008 or C1010 carbon steel to ensure the legs have enough ductility to expand without snapping, while the internal threads maintain a Class 6H tolerance for a perfect bolt fit. This balance of strength and flexibility is what defines the quality of Youjia Metals’ industrial hardware.
Design Precision
Our Petal Nuts feature a unique slotted body produced via Precision Metal Stamping, ensuring uniform expansion flutes.
- Wide footprint prevents pull-through.
- Ideal for blind hole applications.
- Compatible with manual & pneumatic tools.
Material & Finish
Available in High-Tensile Carbon Steel and Stainless Steel 304/316 with specialized anti-corrosion platings.
- Cr3+ Bright Zinc Plating.
- Geomet & Dacromet Options.
- 100% Material Traceability (MTR).
OEM & Customization
As a direct factory manufacturer, we support custom grip ranges and specialized flange diameters for unique projects.
- Drawing-based CAD support.
- Non-standard thread pitches.
- Fast 24-hour B2B quoting.
| Core Keywords | Petal Nut, Jack Nut, Expansion Nut, Hollow Anchor |
| Thread Sizes | M4, M5, M6, M8, 1/4-20, 5/16-18 |
| Grip Range | 0.4mm to 12.0mm (Custom ranges available) |
| Surface Plating | Zinc Cr3+, Nickel, Black Oxide, Geomet, Dacromet |
| Standards | Manufactured to Proprietary Heavy-Duty Industrial Standards |
Industrial Application Cases
Automotive
Mounting trim, spoilers, and accessories to thin body panels.
Enclosures
Securing hardware to plastic, PVC, or fiberglass housings.
Construction
Mounting fixtures to hollow doors and thin sheet facades.
Marine
Installing gear on GRP or carbon fiber boat hulls.
Sourcing & Technical FAQ
A: Petal Nuts (Jack Nuts) are superior for very thin or soft substrates where a standard rivet nut might pull through. The four-petal expansion creates a much larger load-bearing area, making it ideal for plastics, fiberglass, and fragile composites.
A: Once fully expanded, Jack Nuts are permanent internal thread inserts. However, the secondary bolt screwed into the nut can be removed and replaced multiple times without affecting the nut’s grip.
A: We stock standard M4-M8 Petal Nuts for immediate shipment. For custom grip ranges or specialized platings, our manufacturing lead time is typically 12-18 business days.
GET A DIRECT FACTORY QUOTE
Source high-performance Petal Nuts & Jack Nuts directly from the manufacturer. Full technical support and rapid B2B quoting.
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