Tap FANAR GWINTOWNIK M8 DIN-371B LH (6H) HSSE 800

FANAR GWINTOWNIK M8 DIN-371B LH (6H) HSSE 800 is a left-hand M8 hand tap made to DIN 371B specifications. Manufactured from high-speed steel with added cobalt (HSSE), this tap is designed for producing internal M8 threads with a 6H tolerance. The tool is intended for workshop and industrial threading operations where left-hand threads are required and offers the material properties and geometry typical of DIN 371B taps for reliable chip evacuation and thread form.

Advantages

The HSSE composition increases heat resistance and wear life compared with standard HSS, improving performance in interrupted cuts and harder steels. Conformance to DIN 371B geometry provides controlled flute design and chamfer suitable for through holes and partial threading, while the left-hand orientation enables machining of components that require reverse-threaded fastenings. The tap’s tolerance class 6H ensures compatibility with standard M8 bolts and nuts produced to metric tolerances.

Suitable for

• Cutting M8 internal left-hand threads in through-holes and blind holes
• Workshop and manual threading operations
• Repairing or rethreading internal threads in metallic components
• Applications requiring increased wear resistance (machining alloyed steels)

Key specifications

• Thread size: M8
• Thread direction: left-hand
• Standard/geometry: DIN 371B
• Tolerance class: 6H
• Material: high-speed steel with cobalt (HSSE)
• Chamfer/lead type: DIN 371B style suitable for general-purpose threading

How to use

Select an appropriate drill size for the M8 tap drill, secure the workpiece, and ensure correct alignment of the tap to the hole axis. Use cutting fluid appropriate for the work material to reduce friction and improve chip evacuation. Turn the tap clockwise (opposite to standard right-hand direction) to cut the left-hand thread, applying steady pressure and backing off periodically to break chips. For blind holes, stop before bottoming and reverse direction to clear chips; for through-holes use full-length passes as needed. Clean the thread after tapping to remove swarf.

Usage recommendations

Use suitable cutting fluid and proper clamping. For harder or alloyed steels, take lighter cuts and frequent chip clearing. Inspect threads with gauges to confirm 6H tolerance when precision fit is required.