M4 Knurled Countersunk Head Long Rivet Nuts
The M4 Knurled Countersunk Head Long Rivet Nut is a threaded fastener designed for thin-walled materials. Its elongated body is suitable for thicker or layered structures, while the knurled design provides superior resistance to spinning, especially in high-vibration environments. The countersunk head allows for a flush installation, improving aesthetics and preventing interference. With an internal thread diameter of 4 millimeters, it is widely used in automotive manufacturing, electrical enclosures, sheet metal fabrication, and equipment assembly where high-strength, low-profile fastening is required.
Thread Size: M4 × 0.7 (ISO Metric standard)
Head Style: Countersunk (90°) – designed for flush surface installation
Body Type: Long shank for extended grip range; knurled for anti-rotation
Grip Range: Typically 1.0 mm – 4.5 mm (varies by part number)
Head Diameter: Approx. 7.0 – 8.0 mm (countersunk flush profile)
Body Length: Approx. 13 – 16 mm, depending on grip range
Material Options:
Steel (zinc-plated for corrosion protection)
Stainless Steel (304/316 for corrosion resistance)
Aluminum (lightweight applications)
Finish Options:
Clear zinc or yellow zinc plating
Passivated (stainless steel)
Optional anodizing (aluminum)
Shank Features: Knurled surface increases resistance to spin-out during installation or in service
Installation Method: Requires rivet nut setting tool – compatible with manual, pneumatic, or hydraulic tools
Automotive Body and Chassis Components
Provides strong, flush-mounted threaded fastening in structural panels, brackets, and subassemblies, especially under vibration.Electrical and Electronic Enclosures
Ideal for mounting hardware, terminal blocks, and modules in cabinets where space and appearance are critical.Sheet Metal Fabrication
Ensures secure thread installation in thicker or layered metal parts, with knurled shank preventing rotation during torque loading.Industrial Equipment and Machinery
Used in assembly of control panels, machine covers, and guards requiring durable, tamper-resistant threads.Building and Construction Hardware
Suitable for architectural panels, HVAC systems, and support framing where flush installation and mechanical integrity are needed.Aerospace and Transportation
Applied in non-structural components where vibration resistance and minimal head protrusion are required.
1. What is a knurled countersunk head long rivet nut?
It is a threaded insert with a countersunk head for flush installation, a knurled body for anti-rotation, and an extended length to accommodate thicker or layered materials.
2. Why choose a knurled body design?
The knurled surface provides superior resistance to spinning during installation and under load, especially in soft or vibration-prone materials.
3. What does “M4” indicate?
It refers to the metric internal thread size—4 millimeters in diameter with a 0.7 mm pitch.
4. What are the typical grip ranges?
Standard grip range is approximately 1.0 mm to 4.5 mm, depending on the exact part specification.
5. What is the benefit of the countersunk head?
A countersunk head allows the rivet nut to sit flush with the material surface, minimizing protrusion and improving the final assembly’s aesthetics and clearance.
6. Where is this product typically used?
Ideal for automotive panels, electrical enclosures, machinery, and construction components where flush installation and high vibration resistance are needed.
7. What is the standard packaging?
Typically packed in bulk cartons of 1,000 to 5,000 pcs.
MOQ: 50,000.
Custom labeling and quantities are available on request.
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