HELI-COIL Screw Thread Insert STI Tap: Straight Fute, M20x2.5 Metric, H4 / 4H, 4 Flute

This tap is used to create internal threads in metal or plastic for installing HELI-COIL screw thread inserts. It is a general-purpose tool for repair or production work where a strong, wear-resistant thread is needed, commonly in automotive, aerospace, and industrial maintenance applications.

The tap is M20x2.5 Metric with a straight flute, 4-flute design, and plug chamfer. It is rated H4 / 4H for thread class tolerance. The manufacturer part number is 4687-20, and it is made by HELI-COIL. It is designed specifically for use with HELI-COIL screw thread inserts.

3G Electric supplies the HELI-COIL STI Tap 4687-20 to customers worldwide. We handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time. As a global industrial distributor, we source and deliver this tap to support your thread repair or production needs.

Select a tap marked for the same thread size and pitch as the insert, here M20x2.5. Use an STI tap (not a standard tap) because it is oversized to accommodate the insert. The H4 / 4H tolerance ensures proper fit. Always match the tap to the HELI-COIL insert part number for reliable thread strength.