RUKO MGB-DIN376B-HSSCo-vap. M8x1.25mm Machine Tap

For machinists and metalworkers threading through holes in steel, non-ferrous metals, or cast iron, the RUKO MGB-DIN376B-HSSCo-vap. M8x1.25mm machine tap delivers reliable performance. Its cobalt-alloyed high-speed steel construction withstands the heat and abrasion of production environments, while the vapour-treated surface reduces friction and improves chip flow.

Key specifications

• Thread size: M8x1.25 (metric coarse)
• Standard: DIN 376B
• Material: High-speed steel with cobalt (HSSCo)
• Surface: Vapour-treated (steam tempered)
• Chamfer form: Form B (4-5 threads lead)
• Tolerance class: ISO 2 (6H)
• Overall length: 90 mm
• Thread length: 22 mm
• Shank diameter: 6.0 mm
• Square drive: 4.9 mm
• Flutes: 4 straight
• Cutting direction: Right-hand

Why choose it

The cobalt content increases hot hardness, allowing higher cutting speeds and longer tool life compared to standard HSS taps. The vapour treatment creates a thin oxide layer that enhances lubricity and corrosion resistance, reducing the risk of chip welding.

Ideal use cases

• Threading through holes in general-purpose steels
• Non-ferrous metals such as aluminium and brass
• Cast iron components
• Production machining where consistent thread quality is required

Good to know

Form B chamfer provides a lead of 4-5 threads, making it suitable for through holes. The tap is ground to ISO 2 (6H) tolerance for standard fit threads.