MAYKESTAG HSS-Co5 Machine Tap M8 Spiral Fluted ALUNIT DIN 371/376

Maykestag HSS-Co5 Machine Tap M8 Spiral Fluted ALUNIT

Professional M8 spiral-fluted machine tap manufactured from HSS-Co5 and finished with Maykestag&s ALUNIT® coating. Designed for metric ISO threads to DIN 13, it features a 40° spiral angle, ISO 2 (6H) tolerance and Form C chamfer for accurate blind-hole threading.

The Maykestag Code 4837 is a precision machine tap developed for producing metric ISO internal threads in blind holes. Its 40° spiral-fluted geometry helps guide chips back towards the entrance of the hole during tapping, reducing the risk of chips collecting ahead of the cutting edges. This makes the geometry particularly well suited to blind-hole applications where controlled chip evacuation is important for thread quality and reliable machining.

Product highlights

• M8 metric thread: Designed for producing M8 metric ISO internal threads with a standard 1.25mm pitch.
• Spiral-fluted geometry: Helps transport chips back towards the hole entrance, making the tap particularly suitable for blind-hole threading.
• 40° spiral angle: Provides positive chip evacuation during the tapping operation.
• HSS-Co5 construction: Cobalt-alloyed high-speed steel provides the toughness and heat resistance required for professional machine tapping.
• ALUNIT® coating: Maykestag&s specified coating for the Code 4837 series, supporting dependable cutting performance and tool durability under suitable machining conditions.
• ISO 2 (6H) tolerance: Designed to produce standard metric internal threads within the specified ISO tolerance class.
• Form C chamfer: Short 2-3 pitch chamfer suited to blind-hole tapping applications.
• Metric ISO thread: Designed for metric ISO threads according to DIN 13.
• DIN 371 / DIN 376: Manufactured according to the standards specified by Maykestag for this machine-tap series.
• Green-ring Uni classification: Identifies the versatile Maykestag Uni range, with application ratings across several common engineering materials.

Designed for Controlled Blind-Hole Threading

Blind-hole tapping requires effective chip control because the chips cannot simply continue through the workpiece. The Code 4837&s 40° spiral flutes are designed to direct chips towards the hole entrance while the thread is cut. Combined with the short 2-3 pitch Form C chamfer, ISO 2 (6H) tolerance and ALUNIT® coated HSS-Co5 cutting material, this geometry provides a practical solution for accurate machine tapping when the correct pre-drill diameter, cutting speed, lubrication and machine settings are used.