STI HexTap for M18x1.5 oxygen sensor thread HSS-G - M 20 x 1.5

Working on lambda sensors often requires access to tight engine or exhaust areas. The VÖLKEL STI HexTap was designed specifically for this purpose and features a unique Multi-Drive system that is compatible with common tools:

• Internal Square (6.3 mm): This drive fits perfectly onto a ratchet or an angled screwdriver. This allows you to position and turn the tool precisely even in minimal space, which is particularly useful when straight access is blocked.
• External Hexagon (Wrench Size 14 mm): This allows the use of an open-end wrench. This is ideal for applying the necessary torque and powerfully cutting the thread.

This versatility ensures that you have the right tool for any situation and can perform the thread repair quickly and efficiently.

Proceed with the repair of a lambda sensor thread as follows to achieve the best result:

1. Preparation: Allow the engine to cool down completely. Remove the old lambda sensor and thoroughly clean the area around the thread hole of dirt and deposits.
2. Apply lubricant: Apply a generous amount of cutting oil or thread paste to the tap. This is crucial to reduce friction and protect the tool and the thread.
3. Position the tool: Choose the appropriate tool for the Multi-Drive system (ratchet or open-end wrench). Carefully and exactly straight, place the tap into the damaged thread opening.
4. Recut the thread: Apply light, even pressure and turn the tap clockwise. Repeat this process until the thread is fully recut.
5. Cleaning: Carefully remove all chips and residues from the thread hole to ensure a clean installation of the new sensor.
6. Installing the new sensor: Apply some thread paste to the new lambda sensor and screw it in by hand first. Then tighten it with a torque wrench to the manufacturer's specified torque.

• Material: HSS-G
• Tolerance: ISO 2 / 6H
• Nominal Size: M 20 x 1.5
• Overall Length (L1): 50 mm
• Thread Length (L2): 21 mm
• Drive Socket: Internal Square 6.3 mm (1/4")
• Wrench Size (SW1): 14 mm (External Hexagon)
• EAN: 4022835190073
• Article Number: 19007

Why do I need a special tap for lambda sensors?

Lambda sensors use a special fine thread (M 18 x 1.5, M 20 x 1.5, etc.) that differs from standard threads. This VÖLKEL STI HexTap tap is precisely matched to the size M 20 x 1.5 and ensures a correct repair so that the new sensor fits perfectly and is sealed.

What advantages does the Multi-Drive system offer me for this repair?

Lambda sensors are often mounted in hard-to-reach places in the exhaust system. The Multi-Drive system allows you to choose the right drive depending on the space available: the open-end wrench for powerful turns or the ratchet for precise work in very tight corners.

What does HSS-G mean and why is it important for this tool?

HSS-G stands for "High Speed Steel, Ground". The material offers high hardness and wear resistance. The precision grinding of the thread flanks ensures a clean and exact cutting edge, which guarantees the quality of the repair and extends the tool's life.

How does the VÖLKEL STI HexTap differ from a tap set?

Unlike a set, which often consists of roughing, intermediate, and finishing cutters, this tap is optimized for a single-step application. Its geometry is designed to recut a damaged thread in a single pass, which saves time and simplifies the process.

What other applications are there for this tap?

This special tap is primarily intended for repairing lambda sensor threads. However, it can also be used for cutting new threads in machinable materials up to 900 N/mm² and unalloyed and low-alloy steels, provided the thread size M 20 x 1.5 is required.