MAYKESTAG HSS-Co5 Spiral Fluted Machine Tap M30 x 3.5 DIN 376 6H

Maykestag HSS-Co5 Spiral Fluted Machine Tap M30 x 3.5

Professional M30 x 3.5 spiral-fluted machine tap manufactured from HSS-Co5 for producing metric ISO internal threads in blind holes. The 40° spiral flute geometry, Form C chamfer and ISO 2 (6H) tolerance provide a controlled, accurate threading solution for workshop and production machining.

The Maykestag Code 4805 machine tap is designed for machining metric ISO threads according to DIN 13. This M30 version has a standard 3.5mm pitch and is manufactured to DIN 376 dimensions, with HSS-Co5 cutting material providing the toughness and heat resistance required for professional machine tapping applications.

Its 40° spiral-fluted geometry is specifically suited to blind-hole threading. The helical flutes help transport chips back towards the entrance of the hole during cutting, reducing chip accumulation at the bottom of the hole and supporting a cleaner, more controlled tapping process. A Form C chamfer of 2–3 pitches provides a relatively short lead suitable for producing threads where available hole depth is limited.

Product highlights

• M30 x 3.5 metric thread: Produces standard M30 coarse-pitch metric ISO internal threads according to DIN 13.
• HSS-Co5 construction: Cobalt-alloyed high-speed steel provides a strong combination of toughness, hot hardness and cutting-edge durability.
• 40° spiral flutes: Helical flute geometry assists with chip evacuation towards the entrance of the blind hole.
• Blind-hole design: Particularly suited to applications where chips cannot be pushed through the opposite side of the workpiece.
• Form C chamfer: Short 2–3 pitch lead provides controlled thread entry while allowing useful thread depth in blind holes.
• ISO 2 (6H) tolerance: Produces the widely used 6H tolerance class for metric internal threads.
• DIN 376: Manufactured to the applicable dimensional standard for this M30 tap size.
• Green ring Uni classification: Identifies the Maykestag universal application range for versatile machining across a broad selection of suitable materials.

Designed for Reliable Blind-Hole Threading

Blind-hole tapping requires effective chip control because there is no open exit below the thread. The Code 4805 tap addresses this with its 40° spiral flute geometry, which assists in directing chips back along the flutes towards the hole entrance. For this M30 x 3.5 version, Maykestag specifies a 26.5mm tapping drill diameter. Correct hole preparation, suitable lubrication and the appropriate cutting speed are important for reducing tapping torque and achieving accurate thread form.