RUKO HGB-DIN352-HSSCo-60°-M-20x2,50mm HSS-Co Metric Fine Finishing Tap

Machinists and toolmakers cutting M20 x 2.50 mm threads in steel, cast iron, or non-ferrous metals will reach for this RUKO HGB finishing tap. It cuts clean, accurate threads in through and blind holes, and the cobalt-alloyed high-speed steel holds its edge in tougher materials.

Key specifications

• Thread type: Metric ISO
• Thread size: M20
• Thread pitch: 2.50 mm
• Standard: DIN 352
• Material: HSS-Co (High-Speed Steel with Cobalt)
• Tap type: Finishing Tap
• Tolerance class: ISO 2 / 6H
• Cutting direction: Right-hand
• Flank angle: 60°
• Overall length: 140 mm
• Thread length: 45 mm
• Shank diameter: 16.0 mm
• Square size: 12.0 mm
• Number of flutes: 4
• Surface treatment: Bright finish

Why choose it

The HSS-Co substrate resists heat and wear better than standard HSS, so the tap stays sharp longer in production runs. The DIN 352 geometry and ISO 2 / 6H tolerance class produce threads that fit standard metric fasteners without rework.

Ideal use cases

• Threading M20 x 2.50 mm holes in steel fabrications
• Repairing damaged threads in cast iron housings
• Prototype machining in non-ferrous metals

Good to know

This is a finishing tap, intended for final sizing after a taper or intermediate tap. Use a suitable tap wrench on the 12.0 mm square drive and apply cutting oil for best results.