Mastertap M8 DIN 371B (6HX) HSSE-PM Machine Tap for Through Holes

Threading through holes in tough alloys can quickly dull standard taps, causing breakage and scrapped workpieces. This M8 machine tap solves that with a powder-metallurgy HSSE-PM body, high cobalt content, and a 6HX tolerance class—engineered for reliable, precise threads in steels, stainless steels, cast iron, and non-ferrous metals.

Who is it for

CNC machinists, toolmakers, and maintenance professionals who need a durable, high-performance tap for production threading of through holes. Ideal for workshops working with high-strength or work-hardening materials where tool life and thread quality are critical.

Main features

• DIN 371B standard with reinforced shank for added rigidity and reduced deflection.
• HSSE-PM (powder metallurgy high-speed steel with cobalt) offers superior wear resistance and toughness.
• 6HX tolerance class ensures threads meet tight dimensional requirements.
• Form B lead geometry (4-5 threads) provides smooth chip evacuation in through holes.
• Straight flutes and bright finish for efficient cutting and easy chip flow.
• Right-hand cutting direction, 3 flutes, suitable for a wide range of materials.

Specifications

• Thread type: Metric coarse
• Nominal thread size: M8
• Thread pitch: 1.25 mm
• Standard: DIN 371B
• Material: HSSE-PM
• Tolerance class: 6HX
• Application: Through holes
• Flute type: Straight
• Shank type: Reinforced
• Overall length: 90 mm
• Shank diameter: 8 mm
• Square drive size: 6.2 mm
• Lead geometry: Form B (4-5 threads)
• Cutting direction: Right-hand
• Coating: Bright / uncoated
• Recommended material groups: P, M, K, N
• Tool type: Machine tap
• Product series: Mastertap
• Number of flutes: 3

Tips

Use a suitable cutting fluid for the material being tapped to extend tool life. Ensure proper alignment and secure clamping to prevent tap breakage. For through holes, the Form B lead geometry helps chips flow forward, reducing the risk of clogging.