Three-hole Threaded Insert Manufacturer

The three-hole threaded insert, as a high-efficiency connecting element, operates on a similar core principle to traditional threaded bushings. However, its unique structural design solves the jamming problem inherent in traditional products when machining low-strength materials.

What is the working principle of three-hole threaded insert?

The three-hole threaded insert operates primarily through the following three aspects:

1. Self-tapping cutting principle: Equipped with self-tapping thread cutting grooves, this insert eliminates the need for additional tapping tools during installation. When the insert is screwed into the substrate (such as aluminum alloy, cast iron, or mild steel), the cutting grooves within the insert automatically create internal threads, forming a high-strength connection.

2. Impact absorption and strength enhancement: The design of three circular grooves effectively absorbs impact loads without sacrificing strength, increasing overall vibration and pull-out resistance.

3. Core pin anti-torsion design: Compared to traditional L307/L308 series bushings, this product significantly enhances torsional resistance by inserting a core pin between the insert and the substrate hole, preventing the insert from jamming due to excessive torque.

This design makes it particularly suitable for high-strength connections of low-strength materials, ensuring a tight and durable connection.

What tools are needed to install self-tapping threaded bushings?

Although they are self-tapping bushings, the installation process requires specific tools to ensure cutting accuracy and efficiency:

1. P-shaped tool: Used for installing small-gauge threaded bushings of M6 and below. This tool better adapts to small-sized threaded bushing structures, ensuring smooth cutting.

2. S-shaped tool: Used for installing large-gauge threaded bushings of M6 and above. It provides greater torque support and is suitable for handling thicker materials.

3. Dedicated installation machine: For mass production or scenarios requiring high efficiency, a matching automated installation machine or hydraulically driven manual tool is typically used for installation. This tool uses relative axial movement to press the safety flange of the threaded bushing against the substrate surface, ensuring accurate installation positioning.

FAQ

F: What is the purpose of the three holes in a Three-hole Threaded Insert?

Q: These three holes are typically cutting holes. They cut metal shavings when the thread is inserted into the material, helping to create a more precise threaded connection. For plastics or composites, this design prevents cracking and provides greater pull-out resistance.

F: What are the suitable mounting materials?

Q: Metal materials: Widely used for sheet metal such as steel and aluminum. Can be used to reinforce existing threaded holes or repair damaged threaded holes.

Plastic materials: Suitable for plastic parts (such as ABS, nylon). Installed by hot-melt or stamping, it can create a reliable metal threaded connection within the plastic.

F: What are the recommended mounting methods?

Q: Stamping/press-in: Using a stamping machine to press the insert into a pre-drilled hole, suitable for mass production.

Screw Lock-in: Cutting the material by rotating the external thread of the insert itself, suitable for field repairs or small-batch assembly.

Ultrasonic welding: For plastic parts, ultrasonic vibration is used to fuse the metal and plastic together, forming a high-strength connection.

F: What are the preparations before installation?

Q: Drilling: Drill a pilot hole slightly smaller than the outer diameter of the insert, according to the insert specifications.

Cleaning: Ensure the hole is free of burrs, oil, or impurities to avoid affecting the locking effect of the insert.