RUKO HGB-II DIN352 HSS 60° M4 x 0,70 mm stredný závitník pre ľavý závit

Manual threading of left-hand metric coarse threads in unalloyed and low-alloyed steels up to 800 N/mm² requires a tap that matches the exact thread standard and direction. The RUKO HGB-II DIN352 HSS 60° M4 x 0.70 mm Left-Hand Intermediate Tap provides a precise cut for M4 left-hand threads with a 0.70 mm pitch.

Who is it for

Machinists, metalworkers, and maintenance technicians who need to produce or repair left-hand threaded holes in steel workpieces. It is suited for manual threading operations where control and accuracy are essential.

Main features

• Left-hand thread direction for reverse-thread applications.
• Metric coarse thread M4 with 0.70 mm pitch to DIN 352.
• Intermediate tap (Mittelschneider) with lead taper of approximately 4-6 threads for progressive cutting.
• High-speed steel (HSS) construction for durability in steel up to 800 N/mm².
• 60° thread angle and ISO 2 (6H) tolerance class.
• Bright uncoated surface.
• 3 flutes for efficient chip evacuation.

Specifications

• Thread Type: Metric Coarse Thread
• Thread Standard: DIN 352
• Nominal Diameter: M4
• Thread Pitch: 0.70 mm
• Thread Direction: Left-Hand (LH)
• Tap Type: Intermediate Tap
• Material: High-Speed Steel (HSS)
• Thread Angle: 60°
• Tolerance Class: ISO 2 (6H)
• Application: Manual Threading
• Overall Length: 45 mm
• Thread Length: 13 mm
• Shank Diameter: 4.5 mm
• Square Size: 3.4 mm
• Number of Flutes: 3
• Lead Taper: Approx. 4-6 threads
• Surface Treatment: Bright (Uncoated)
• Recommended Material: Unalloyed and low-alloyed steels up to 800 N/mm²

Tips

Use a suitable tapping lubricant and ensure the tap is aligned perpendicular to the workpiece. Reverse the tap periodically to break chips and prevent binding.