Self-Tapping Inserts for Aluminum and Plastics – Strong Threads Without Pre-Tapping

When working with low-strength materials like aluminum, thermoplastics, composites, or even wood, traditional threading methods often fail—causing stripped threads, loose joints, or premature failure.

The solution? Self-Tapping Inserts.

At Dongguan Sango Hardware Fasteners Co., Ltd., we manufacture and export a wide range of self-tapping threaded inserts designed for high-strength, repeatable fastening without the need for pre-tapping or adhesive.

1. What Is a Self-Tapping Insert?

A Self-Tapping Insert is a cylindrical metal bushing with cutting flutes or threads designed to cut its own internal thread as it’s driven into a base material. Once installed, it provides a metal thread interface for machine screws in materials that normally wouldn't support threading.

🧩 Core Advantages:

• No need to tap or pre-thread holes
• High pull-out and torque resistance
• Creates reusable, wear-resistant threads
• Suitable for post-molding installation
• Ideal for field repair or retrofits

2. Common Types of Self-Tapping Inserts

🔹 Slotted Insert (Straight Flute)

• Cuts thread into plastic or soft metals
• Allows material flow during installation
• Typically used in thermoplastics, ABS, PP

🔹 Threaded Insert with Cutting Holes

• Multiple axial holes aid chip removal
• Offers better grip and reduced stress on material

🔹 Hex Drive Insert

• Driven with Allen key or hex driver
• Easy to control installation depth and torque

🔹 Self-Tapping Insert with External Knurling

• Knurled surface increases friction
• Prevents rotation or pull-out in soft materials

🔹 Closed-End Insert

• Prevents screw intrusion into hollow base
• Ideal for electrical components or fluid-sensitive assemblies

3. Applications of Self-Tapping Inserts

Self-tapping inserts are essential in:

• 🔩 Aluminum component mounting
• 🖥️ Plastic enclosures for electronics and displays
• 🛠 3D printed prototypes and production parts
• 📦 Consumer electronics with removable panels
• 🪵 Wood furniture and flat-pack assembly
• 🧪 Medical device housing and lab equipment

They’re also widely used in aftermarket repair, field retrofitting, and OEM contract manufacturing.

4. Choosing the Right Insert