Helicoil inserts, also known as screw thread inserts, are cylindrical coils of wire precisely formed to create strong, wear-resistant threads in softer materials. They're frequently used to repair damaged threads or to provide superior thread strength in applications where the base material might be prone to stripping. Understanding the different sizes, applications, and installation methods is crucial for successful use. This comprehensive guide will delve into the specifics of Helicoil inserts, focusing on sizes 5, 16, and 18, though the principles apply broadly.
Helicoil Insert Sizes: Deciphering the Numbers
The numbers you encounter (5, 16, 18 in this case) when referencing Helicoil inserts usually refer to the thread size, specifically the major diameter of the insert and indirectly its application. These numbers don't represent a standard sizing system universally used across all manufacturers, so always cross-reference with the manufacturer's specifications. For instance, a "Helicoil 5" might refer to a specific size in a particular Helicoil catalog, but it's not interchangeable with another manufacturer's "size 5".
The information provided by the manufacturer will usually specify the:
- Thread size (e.g., M5, #10-32): This indicates the diameter and pitch of the thread the insert creates.
- Material: Helicoil inserts are typically made of stainless steel, providing excellent corrosion resistance and strength.
- Length: The length of the insert dictates how deeply it will be embedded in the base material. Longer inserts offer greater holding power.
- Type: Helicoil offers various insert types, each designed for specific applications and levels of stress.
Therefore, "5 16 18 Helicoil" likely represents a list of distinct Helicoil insert sizes, not a single specific type. To understand their exact specifications, consult the relevant Helicoil catalog or the manufacturer's documentation.
Common Applications for Helicoil Inserts
Helicoil inserts are used across diverse industries due to their ability to enhance thread strength and durability. Some key applications include:
- Automotive: Repairing stripped threads in engine blocks, cylinder heads, and other critical components.
- Aerospace: Providing reliable and strong threads in lightweight materials used in aircraft construction.
- Manufacturing: Enhancing the longevity of threaded components in machinery and equipment.
- Electronics: Creating durable threaded connections in delicate electronic devices.
Helicoil Insert Installation: A Step-by-Step Guide (General Process)
While the specific tools and techniques might vary slightly depending on the size and type of Helicoil insert, the general installation process follows these steps:
- Prepare the Damaged Thread: Clean the damaged threads thoroughly. Use a tap to remove any remaining damaged threads, ensuring a clean and accurate hole.
- Select the Correct Insert Installation Tool: Helicoil provides specialized tools (taps, mandrels, installation tools) for each insert size. Selecting the proper tools is essential for accurate installation.
- Tap the Hole: Using the correct tap (usually provided by Helicoil), create a pilot hole of the correct size. This ensures accurate placement of the insert.
- Insert the Helicoil: The specialized installation tool guides the Helicoil into the tapped hole, ensuring proper seating and alignment. This tool prevents damaging the delicate insert during installation.
- Trim the Excess: Once the Helicoil is fully seated, trim any excess coil flush with the surface.
Caution: Incorrect installation can lead to a faulty or weak thread. Always refer to the manufacturer's instructions for your specific Helicoil insert size and type.
Conclusion
Helicoil inserts offer a reliable solution for repairing damaged threads or creating stronger threads in weaker materials. Understanding the sizing system (even if it's not fully standardized), application, and proper installation techniques is key to maximizing their effectiveness. Always consult the manufacturer’s documentation for detailed instructions and safety precautions regarding the specific Helicoil insert sizes you're using.
