Stainless Steel 304 316 Pal Nuts Self Locking Counter Nuts M6-M64 DIN 7967

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What Are PAL Nuts?

PAL nuts (also known as PAL lock nuts or push-on lock nuts) are a type of self-locking fastener designed to resist loosening under vibration and torque. They feature a unique crown-like design with multiple flexible prongs that grip the mating bolt or stud when pressed on, creating a secure, vibration-resistant connection. Unlike traditional lock nuts (such as Nyloc or Keps nuts), PAL nuts do not require threading—they simply push onto the fastener, making installation quick and tool-free.

These nuts are widely used in automotive, aerospace, electronics, and industrial machinery, where reliable fastening without the risk of unintentional loosening is critical.

Materials for PAL Nuts

PAL nuts are available in various materials to suit different environmental and mechanical needs:

• Carbon Steel (Zinc-Plated or Black Oxide) – Offers good strength and corrosion resistance for general industrial use.

• Stainless Steel (304, 316) – Ideal for harsh environments, including marine and chemical applications.

• Brass – Used in electrical and plumbing applications due to its non-magnetic and corrosion-resistant properties.

• Aluminum – Lightweight, often used in aerospace and automotive applications where weight reduction is crucial.

Surface Finishes

To enhance durability and performance, PAL nuts can be treated with different coatings:

• Zinc Plating – Provides basic corrosion resistance and a clean appearance.

• Hot-Dip Galvanizing – Heavy-duty protection for outdoor and industrial environments.

• Nickel Plating – Improves wear resistance and offers a polished, decorative finish.

• Passivation (for Stainless Steel) – Enhances corrosion resistance by removing free iron particles.

Specifications

• Thread Compatibility: Designed for standard metric (M3-M12) and imperial (#4-40 to 1/2″-13) fasteners.

• Locking Mechanism: Flexible prongs grip the bolt threads, eliminating the need for additional washers or adhesives.

• Temperature Range: Typically -40°C to +120°C (higher for stainless steel variants).

• Installation: Tool-free push-on application, allowing for rapid assembly.

Applications

PAL nuts are widely used in industries requiring quick assembly and vibration resistance, including:

• Automotive: Securing sensors, wiring harnesses, and interior trim components.

• Aerospace: Fastening lightweight panels and non-structural components.

• Electronics: Locking PCB standoffs and chassis screws.

• Industrial Machinery: Preventing loosening in conveyor systems and motor mounts.

• Consumer Appliances: Used in washing machines, HVAC units, and power tools.

Excellent Case: Automotive Wiring Harness Retention

Challenge

A leading automotive manufacturer faced frequent loosening of nuts securing wiring harnesses in high-vibration areas (e.g., engine compartments). Traditional lock washers and thread-locking compounds were either too slow to install or failed under prolonged stress.

Solution

The engineering team switched to stainless steel PAL nuts for all critical wiring harness connections. The push-on design allowed for rapid assembly on the production line, while the self-locking prongs ensured a secure grip even under extreme engine vibrations.

Results

• Zero Failures: No reported loosening after 100,000+ miles of road testing.

• Faster Assembly: Reduced installation time by 30% compared to threaded lock nuts.

• Cost Savings: Eliminated the need for additional washers or adhesives, cutting material costs.

This case demonstrates how PAL nuts provide a reliable, efficient, and cost-effective fastening solution in high-demand applications.

Conclusion

PAL nuts offer a unique combination of quick installation, vibration resistance, and durability, making them an excellent choice for industries where fast, secure fastening is essential. Their versatility in material and finish options ensures compatibility with a wide range of applications, from automotive to aerospace. By eliminating the need for threading or additional locking mechanisms, they streamline assembly while maintaining long-term reliability.