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.
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
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.
1. What is a hex flat head open end rivet nut?
It is a threaded insert with a hexagonal body, flat head, and open-end design. It offers strong anti-rotation properties and allows through-bolting or electrical continuity.
2. What does “M5” refer to?
“M5” indicates a 5 mm internal metric thread diameter with a 0.8 mm pitch.
3. Why choose a hex body over a round one?
The hex body prevents spinning in the parent material, providing superior torque resistance—ideal for high-load or vibration-prone environments.
4. What is the purpose of the open-end design?
The open end allows a bolt to pass completely through the insert, enabling full-thread engagement or grounding if necessary.
5. What material is this rivet nut made of?
This version is made from carbon steel, typically with a zinc-plated finish for corrosion resistance.
6. What grip range does it support?
Grip range usually spans from 0.5 mm to 3.5 mm depending on the variant. Always match the part to your material thickness.
7. Can it be used in round holes?
No, a hex body rivet nut must be installed in a pre-punched or machined hexagonal hole to prevent spinning.
8. What are common use cases?
Found in automotive frames, enclosures, industrial equipment, racking systems, and any metal assembly requiring a strong threaded anchor.
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