RUKO HGB-II DIN352 HSS 60° M20 x 2.5 mm Left-Hand Hand Tap

In maintenance workshops and metalworking facilities, threading left-hand M20 holes in steel components demands a tap that combines precision with durability. The RUKO HGB-II hand tap is engineered for exactly this task, cutting clean internal threads in unalloyed and low-alloyed steels, cast iron, and non-ferrous metals. Its left-hand direction suits applications where rotation is reversed or where a locking thread is required.

Key specifications

• Thread size: M20 x 2.5 mm
• Thread direction: Left-hand
• Thread standard: DIN 352
• Material: High-speed steel (HSS)
• Surface treatment: Bright (uncoated)
• Overall length: 110 mm
• Thread length: 40 mm
• Shank diameter: 16 mm
• Square drive: 12 mm
• Number of flutes: 4
• Flute type: Straight
• Tolerance class: ISO 2 (6H)
• Recommended core hole diameter: 17.5 mm

Why choose it

The HGB-II tap is made from high-speed steel, providing a balance of toughness and wear resistance for hand tapping operations. Its 60° thread angle conforms to the metric standard, ensuring compatibility with common fasteners. The bright finish reduces friction during cutting, while the straight flutes efficiently evacuate chips from the hole.

Ideal use cases

• Creating left-hand internal threads in steel plates and structural components
• Repairing or restoring damaged left-hand threads
• Threading in maintenance, repair, and overhaul (MRO) tasks
• Workshop applications involving cast iron or non-ferrous metals

Good to know

For optimal results, use a suitable tap wrench and apply cutting oil. The recommended core hole diameter of 17.5 mm ensures proper thread engagement and reduces tap breakage risk.