Thread Tap M8 DIN 376 Form C R40 Extra Long HSSE 6H Machine Tap

For machinists who need reliable thread cutting in deep or hard-to-reach through holes, this extra-long M8 tap offers a reinforced shank and cobalt-alloyed HSSE steel for superior wear resistance. Unlike standard-length taps, the R40 EL geometry provides extended reach without sacrificing precision, making it a practical choice for demanding workshop environments.

Highlights

• Extra-long design (EL) for deep-hole threading applications
• HSSE cobalt steel withstands high temperatures and tough materials
• Form C chamfer with 2-3 threads for balanced cutting and alignment
• Metric coarse thread M8 × 1.25 mm to DIN 376 standard
• Thread tolerance class 6H for medium fit internal threads
• Spiral flute geometry aids chip evacuation in through holes
• Reinforced shank reduces deflection and improves stability
• Bright uncoated finish for general-purpose use

In daily use

This tap is intended for cutting M8 metric coarse threads in through holes across steel, stainless steel, cast iron, and non-ferrous metals. The extra-long shank allows access to recessed or deep workpieces, while the spiral flutes help pull chips forward and out of the hole. The Form C lead (2-3 threads) provides a good balance between easy starting and thread depth, making it suitable for both manual and machine tapping operations. The 6H tolerance class is the most common for general engineering, ensuring compatibility with standard M8 bolts and screws.

Full specifications

• Product type: Machine tap
• Thread type: Metric coarse
• Nominal thread diameter: M8
• Thread pitch: 1.25 mm
• Standard: DIN 376
• Chamfer form: Form C (2-3 threads)
• Material: HSSE (high-speed steel with cobalt)
• Thread tolerance class: 6H
• Flute type: Spiral flute
• Shank type: Reinforced shank
• Overall length (L1): 100 mm
• Thread length (L2): 25 mm
• Shank diameter (d1): 6.0 mm
• Square drive size (k): 4.9 mm
• Application: Through holes
• Recommended materials: Steel, stainless steel, cast iron, non-ferrous metals
• Designation: EL (extra long)
• Coating: Uncoated / bright finish

Final note

A dependable extra-long HSSE tap for M8 through-hole threading, built to DIN 376 with a reinforced shank and 6H tolerance for everyday workshop use.