M5 Hex Flat Head Open End Rivet Nut
The M5 Hex Flat Head Open End Rivet Nut is a fastener designed for high-strength connections in thin materials or structures where tapping threads is not feasible. Its hexagonal body prevents rotation after installation, making it ideal for applications requiring higher torque resistance. The flat head offers a broad bearing surface, helping to distribute load and enhance joint stability. The open-end design allows a bolt to pass through the nut entirely, enabling through-fastening or electrical grounding if needed. With a 5 mm internal thread, it is widely used in automotive manufacturing, machinery, sheet metal assemblies, and heavy-duty fastening applications.
Product Details
Thread Size: M5 × 0.8 (ISO Metric Standard)
Head Style: Flat head – wide bearing surface for load distribution and flush installation
Body Type: Hexagonal shank – prevents rotation and ensures high torque resistance
End Type: Open end – allows bolt-through or electrical grounding
Grip Range: Typically 0.5 mm – 3.5 mm (varies by part specification)
Head Diameter: Approx. 9.5 – 11.0 mm
Body Length: Approx. 13 – 16 mm depending on grip range
Material: Carbon Steel
Finish: Zinc-plated (clear or yellow) for corrosion protection
Installation: Requires rivet nut setting tool (manual, pneumatic, or hydraulic) and hex-prepared holes
Key Features:
High torque resistance due to hexagonal shank
Strong mechanical performance in sheet metal
Open-end design supports full bolt penetration
Applications
Automotive Manufacturing
Used in vehicle frames, body panels, and undercarriage assemblies requiring strong, anti-rotation fastening solutions.Industrial Machinery and Equipment
Ideal for mounting brackets, control panels, and structural components where high pull-out and torque resistance is critical.Sheet Metal and Enclosure Fabrication
Enables durable thread installation in metal cabinets, switchgear housings, and electrical boxes—especially where access is one-sided.Heavy-Duty Racking and Framing Systems
Supports secure assembly of modular frames, shelving, and load-bearing joints in storage and material handling systems.Construction and Infrastructure Projects
Used in HVAC systems, elevator panels, and building fixtures where reliable anchoring in thin metal is required.Transportation and Agricultural Equipment
Provides rugged fastening in high-vibration environments like trailers, tractors, and construction vehicles.
FAQs
1. What Is an M5 Hex Flat Head Open End Rivet Nut?
This is a rivet nut with an M5 internal thread, a hexagonal body, a flat round head, and an open-end tail. It is designed for applications that require strong anti-rotation performance and a low-profile head. It’s widely used in sheet metal, tubing, and structural components for medium-load connections.
2. What Substrates and Structures Is the M5 Hex Rivet Nut Suitable For?
Ideal for metal sheets (steel, stainless steel, aluminum) with thicknesses from 0.5mm to 3.0mm.
Especially suitable for pre-formed hex holes, providing excellent resistance to spinning.
Can be installed in closed profiles and blind-hole structures where rear access is not available.
Commonly used in electrical enclosures, automotive components, mechanical assemblies, and communication equipment housings.
3. What Materials Are M5 Hex Open-End Rivet Nuts Made Of?
Carbon Steel: Cost-effective, moderate strength, suitable for most general industrial environments.
Stainless Steel (304 / 316): Ideal for humid or corrosive environments such as marine, outdoor, or electrical applications.
Aluminum Alloy: Lightweight, ideal for weight-sensitive applications with moderate load requirements.
4. What Are the Advantages of the Flat Head Design?
The low-profile head creates a cleaner, more aesthetic surface after installation.
Reduces protrusion, ideal for space-constrained or appearance-sensitive applications.
Provides a larger contact area with the installation surface, enhancing grip stability.
5. Why Choose an Open-End Rivet Nut?
a. Through-Hole Design for Bolt Pass-Through
The open end allows the bolt to pass completely through the nut, enabling deeper or longer bolt engagement.
Useful in applications where bolts connect multiple layers or need to extend through the structure.
b. Lower Cost for Mass Production
Simpler manufacturing process compared to closed-end versions, with no sealed tail required.
Therefore, the unit cost is lower, making it ideal for mass production in non-sealed applications.
c. Better Heat Dissipation
The open tail allows air or heat to circulate more easily within the rivet nut.
Beneficial in electronics, LED assemblies, or heat-sensitive structures.
d. Greater Installation Flexibility and Compatibility
Compared to closed-end nuts, open-end types have greater tolerance for installation depth and bolt length.
Compatible with a variety of substrate thicknesses and through-bolt applications.
6. What Is the Recommended Hole Size for Installation?
For hexagonal holes, the across-flats dimension should be 7.92 mm ± 0.05 mm.
For round holes (not recommended), use knurled or anti-rotation designs to prevent spinning.
Ensure roundness error ≤ 0.02 mm and apply deburring and chamfering to improve installation quality.
7. Is a Special Tool Required for Installation?
Yes. It is recommended to use manual rivet nut tools or pneumatic/electric rivet nut guns.
M5 rivet nuts typically require a pulling force of 2000 to 3500 N.
The tool should be held perpendicular to the substrate to ensure proper deformation and expansion of the nut.
8. Can the Rivet Nut Be Customized?
Yes, we offer customized rivet nut services. Customization is available based on your needs:
Grip range length
Surface treatments (e.g., zinc plating, Dacromet coating, anodizing)
Thread type (e.g., metric, UNC, UNF)
Head shape or color marking
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+86 189 6230 4392
or write
manufacture@world-rivet.com
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