Round Sunflower Threaded Tube Connecting Nuts Plum Blossom Shrapnel Bottom Plug Nut

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What Are Tube Connecting Nuts?
Tube Connecting Nuts are specialized fasteners designed to securely join tubes or pipes in mechanical and fluid systems. They typically feature a threaded interior that mates with a corresponding threaded fitting, while their exterior may include a hexagonal or flanged design for easy wrench tightening. These nuts ensure leak-proof connections in high-pressure or high-vibration environments, making them essential in plumbing, hydraulic systems, and industrial machinery.

Materials
Tube Connecting Nuts are manufactured from various materials to suit different operational demands:

• Stainless Steel (e.g., SUS304, SUS316): Offers excellent corrosion resistance, ideal for harsh environments like marine or chemical processing3.

• Carbon Steel: Provides high strength and cost-effectiveness, often coated for corrosion protection.

• Brass: Used in plumbing and electrical applications due to its anti-corrosive and conductive properties.

• Aluminum: Lightweight and corrosion-resistant, suitable for aerospace and automotive systems.

Surface Treatments
To enhance durability and performance, these nuts undergo surface treatments such as:

• Zinc Plating: Common for carbon steel nuts, providing basic rust resistance4.

• Passivation (for Stainless Steel): Removes free iron particles to maximize corrosion resistance.

• Nickel or Chrome Plating: Improves wear resistance and aesthetic appeal.

• Black Oxide: Reduces glare and improves friction in high-torque applications.

Specifications
Key specifications include:

• Thread Standards: Metric (e.g., M6, M8) or Imperial (e.g., 1/4″-20, 3/8″-16).

• Size Range: Typically from M4 to M20 or 1/8″ to 1″ in diameter.

• Pressure Rating: Varies by material and design, often rated for 1000+ PSI in hydraulic systems.

Application Fields
Tube Connecting Nuts are widely used in:

• Hydraulic & Pneumatic Systems: Ensuring leak-free connections in high-pressure fluid lines.

• Automotive Fuel Lines: Securing fuel and brake line fittings.

• Industrial Machinery: Joining coolant or lubrication tubes in manufacturing equipment.

• HVAC & Plumbing: Connecting refrigerant lines and water pipes.

Excellent Case: High-Pressure Hydraulic System in Construction Machinery
A leading construction equipment manufacturer faced frequent leaks in their hydraulic excavator systems due to vibration-induced loosening of standard nuts.

Challenge: The existing fittings failed under dynamic loads, causing downtime and fluid leakage.

Solution: The company switched to stainless steel Tube Connecting Nuts with a flanged design and anaerobic thread-locking compound. The nuts’ high tensile strength (up to 165MPa) and corrosion resistance withstood harsh job site conditions18.

Outcome:

• Zero Leaks: The redesigned connection survived 2,000+ hours of vibration testing.

• Cost Savings: Reduced maintenance costs by 40% compared to previous fittings.

• Efficiency Gain: Enabled faster assembly with the flange’s built-in wrench grip.