Tap FANAR GWINTOWNIK M 7 NGMM/3 DIN-352 (6H) HSS — metric M7 cutting tap, HSS

FANAR GWINTOWNIK M 7 NGMM/3 DIN-352 (6H) HSS is a metric cutting tap designed to produce internal M7 threads conforming to DIN 352. Manufactured from high-speed steel (HSS), this tap is intended for cutting threads in steel, non-ferrous metals and other machinable materials where a durable cutting edge and dimensional accuracy are required. The NGMM/3 designation identifies the flute geometry and tolerance class optimized for general-purpose workshop threading and repair applications.

Advantages

The HSS material offers high hardness and wear resistance at elevated cutting temperatures, extending tool life during intermittent and continuous use. The NGMM/3 flute geometry provides efficient chip evacuation and reduced risk of clogging when cutting short to moderate-length internal threads. The DIN 352 specification and 6H tolerance class ensure consistent thread form and interchangeability with corresponding external threads.

Suitable for

• Cutting internal metric M7 threads in steel and alloy steels
• Threading in non-ferrous metals such as aluminum and brass
• Workshop maintenance, toolroom and repair threading tasks
• Precision assemblies requiring DIN 352-compliant internal threads

Key specifications

• Thread size: M7 (metric)
• Material: high-speed steel (HSS)
• Standard: DIN 352 thread tap form
• Tolerance class: 6H (internal thread tolerance)
• Flute/type designation: NGMM/3 (flute geometry for chip control)
• Application: through and blind hole internal threading (depending on drill depth and setup)

How to use

Select an appropriate pilot drill hole matched to M7 thread tapping recommendations and secure the workpiece to prevent movement. Use a suitable tap holder or machine spindle rated for the tap size and apply cutting fluid appropriate to the workpiece material to improve lubrication and heat dissipation. Start the tap square to the hole and cut slowly; for manual tapping use periodic backing-off strokes to break chips. If machine tapping, set correct spindle speed and feed for the material and tap geometry. After threading, clean chips from the hole and inspect the thread for form and fit.

Usage recommendations

For best results, match drill diameter and cutting speed to the workpiece material, use appropriate cutting fluid, and replace the tap when wear or damage affects thread quality. When threading harder alloys, reduce speed and increase lubrication to extend tap life.