HSS-CO5 Machine Tap M4 Spiral Fluted Alunit Din 371 376

Features

Description

Maykestag HSS-Co5 Machine Tap M4 Spiral Fluted ALUNIT Professional M4 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. What is a spiral-fluted machine tap? A spiral-fluted machine tap has helical flutes that help transport chips backwards and out of the hole while the thread is being cut.

This differs from geometries that push chips forward and makes spiral-fluted taps especially useful for blind holes. The Code 4837 combines this geometry with a 40° spiral angle and a short Form C chamfer of 2-3 pitches for controlled thread entry. Product highlights

• M4 metric thread: Designed for producing M4 metric ISO internal threads with a standard 0.70mm 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.

Why Choose Maykestag?

Maykestag is an Austrian cutting-tool brand focused on precision-manufactured tooling for professional machining. With threading tools, accurate geometry, consistent tolerances and correct material selection are especially important because all cutting edges must work together to produce a clean, dimensionally accurate thread.

The Code 4837 series combines HSS-Co5 tool material, ALUNIT coating, a 40° spiral flute and Form C chamfer geometry in a versatile machine tap for blind-hole threading. Maykestag's application ratings make it easier to match the tap to the workpiece material and select suitable cutting conditions for dependable production work.

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.