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Three-holes self-tapping threaded inserts
Self-Tapping Insert
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Three-holes self-tapping threaded inserts

Three-holes self-tapping insert (also known as the 307/308 self-tapping insert) is a fastener designed for high-strength threaded connections and thread repair, especially suitable for difficult-to-cut or low-shear stress materials. The following is a detailed description of the product:


Product Definition
Three-holes self-tapping insert is a one-piece threaded insert with three round holes at the rear end. It has threads on both the inside and outside. It does not require pre-tapping during installation. It is screwed into the pre-drilled hole using a special tool. The round hole structure is used to achieve self-drilling cutting, forming a high-strength internal thread.

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    Materials and Surface Treatment 
    Dimensions
    Product Advantages
    Application Areas
     Installation Method
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    Carbon steel (1215)

    Surface color zinc plating, suitable for low-strength materials such as aluminum alloy, copper alloy, and plastic;

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    Stainless steel (SUS303, 304, 316)

    Corrosion-resistant and high-temperature resistant, suitable for environments such as ships, medical equipment, and food equipment.

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    Three-holes self-tapping threaded inserts (3)

    ◎ Metric thread sizes include M3, M4, M5, M6, M8, M10, M12 and so on.

    ◎ Inch/Unified threads (UNF/UNC) include #4-40, #6-32, #8-32, #1/4-20 and so on.

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    Compared with slotted types

    ◎ Higher connection strength and load-bearing capacity: Because it is extruded rather than cut, the base material around the screw insert is denser and there is no material loss caused by chips, so it can withstand higher pull-out and twist-out forces.

    ◎ Chip-free installation: The installation process generates no chips, making it ideal for applications requiring the utmost cleanliness, such as aerospace, engine blocks, hydraulic systems, and food processing, eliminating chip contamination and the hassle of cleanup.

    ◎ Excellent vibration and loosening resistance: The extruded threads create an interference fit with the insert, resulting in an extremely tight connection. This provides superior vibration and loosening resistance compared to cut inserts.

    ◎ Excellent sealing: The extrusion process creates a tighter fit between the insert and the base material, sometimes providing a sufficient gas or liquid seal.

    ◎ Higher torque resistance: The three circular holes allow the insert to withstand greater torque from the installation tool, making it less susceptible to damage and providing more reliable installation.

    Widely used in the following industries and products:

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    Automotive

    Engines, transmissions, headlights, bumpers, etc.;
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    Electronic and electrical appliances

    Appliance housings, communications equipment, solar lamps;
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    Mechanical equipment

    Construction machinery, power tools, molds;
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    Aerospace and military

    Lightweight structural component connections;
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    Furniture and consumer goods

    Engineering plastics, high-end modular furniture, etc.

    Pre-drilling: Select an appropriate drill bit based on the insert's outer diameter and material.

    Screwing into the insert: Use a dedicated tool to screw the slotted self-tapping insert into the hole, and the cutting groove automatically creates the thread.

    Checking the depth: Ensure the insert is slightly below or flush with the workpiece surface after installation.

    Screwing: Standard bolts can be used for immediate assembly without waiting for curing.

    For specific application requirements (such as plastics, high-strength metals, or corrosion resistance), ST self-tapping inserts with three round holes (307/308) or flanged versions are also available as alternatives.

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