Thread Repair Cutter Kit - 5/16" X 18 BSW

This kit is specifically designed for 5/16" x 18 BSW (British Standard Whitworth) threads.

The kit is most effective on soft materials such as aluminum, magnesium, cast iron, and plastics where traditional threads may strip easily.

Using cutting oil is highly recommended when tapping. It lubricates the tap, reduces friction, helps clear chips, and results in a cleaner, more precise thread.

The kit includes 10 x 5/16" x 18 BSW helicoil inserts.

The tang breaking tool is used to snap off the small lug (tang) at the bottom of the installed helicoil insert. This ensures the insert is fully seated and the thread is smooth for use.

Yes, this kit can be used for both types of holes, as long as the length of the insert is appropriate for the application and the tang can be accessed for removal.

All components are supplied in a durable blow-molded case. Store the tools and inserts within this case when not in use to keep them organized and protected.

Ensure the drill bit is sharp and rotating at an appropriate speed for the material. Apply steady pressure. If the material is very hard, consider using a slower speed and more cutting fluid.

Apply more cutting oil and try turning the tap back and forth slightly to clear debris. Ensure the tapped hole is perfectly straight and aligned with the original thread path.

Verify that the correct size tap was used and that the tapped hole is clean. Ensure the insert is properly aligned with the tap's thread before screwing it in. A small amount of lubricant can help.

Ensure the tang breaking tool is correctly positioned over the tang. Apply firm, sharp pressure. If stubborn, a small punch might be used carefully after the tool, but avoid damaging the new thread.

The insert may not have been fully seated or the original material was too soft. Ensure the insert is properly installed and flush. For very soft materials, consider using a stronger thread repair method or a larger insert if available for the application.