The Baer Heli Coil Tap is the precise starting point for durable thread repairs and reinforced fastener holes. Engineered to cut an oversize STI thread, this bottoming tap (M36 x 4) creates the correct foundation for a Helical wire thread insert to seat firmly and restore original fastener engagement in demanding metal applications.

Key advantages you’ll feel in the shop

• Oversized STI bottoming tap design—cuts the dedicated depth needed for wire thread inserts and ensures the final installed insert reproduces the intended nominal M36 x 4 thread. This is essential for reliable engagement with the corresponding fastener after installation.
• Metric M36 x 4 specification—a common size for heavy-duty repairs in automotive, machinery, and industrial components, with taps explicitly built to pair with M36 x 4 inserts.
• High-speed steel (HSS) construction designed for longevity and repeated use in hard materials, delivering the rigidity and wear resistance required for precise thread formation.
• Designed for insert-ready holes—when paired with BaerCoil wire thread inserts, the tap prepares a compatible thread that accepts the insert and reestablishes a strong, serviceable thread for the original fastener.
• Bottoming capability for blind holes—one of the defining features of STI bottoming taps, enabling full-depth threading to the bottom of the hole and ensuring the insert sits correctly for optimal load transfer.

Who benefits most

• Machinists, maintenance technicians, and shop professionals who repair stripped or damaged threads in critical components where a secure fastener matters as much as the fit itself.
• Assemblers working with metal housings, housings, engine blocks, transmission cases, and other high-stress assemblies that demand repeatable insert performance.

Practical usage notes

• Use the BaerCoil STI process to drill, oversize-tap, and install the wire thread insert, then drive the insert into the prepared hole for a reconstituted, load-bearing thread that accepts standard fasteners again. This sequence minimizes the risk of thread funnelling or misalignment and preserves material integrity.
• Opt for this M36 x 4 bottoming tap when the target application requires a bottomed, true-depth thread for the insert and where the outer fastener engagement is critical to performance.

Invest in the BaerCoil Heli Coil Tap to ensure reliable, repeatable thread restoration and a solid foundation for your wire thread inserts. When you need a trusted tool that delivers precise depth, durable steel construction, and compatibility with metric inserts, this tap is built for the job.