M20 x 1.5 Metric Fine Thread Machine Tap, DIN 2181, 6H Tolerance, HSS, Bright Finish

For machinists who need a tap that holds tight tolerances in blind and through holes, the M20 x 1.5 metric fine thread tap delivers a 6H class fit straight out of the box. Unlike general-purpose taps that wander under load, this straight-flute HSS tool is ground to DIN 2181 dimensions, so thread depth and pitch stay consistent from the first hole to the last. The bright finish reduces chip adhesion, while the 4-flute geometry clears swarf efficiently in steel and non-ferrous alloys.

Highlights

• Metric fine thread M20 x 1.5 mm with 6H tolerance class for precision fits.
• High-speed steel (HSS) body withstands heat and wear during machine tapping.
• Straight flutes and right-hand cut suit conventional tapping heads and rigid setups.
• Bright surface treatment minimises friction and improves chip flow.
• DIN 2181-compliant dimensions ensure compatibility with standard tap holders.

In daily use

This tap is intended for machine tapping operations where repeatability matters. The 110 mm overall length and 16 mm shank diameter provide a rigid setup in collets or quick-change chucks, while the 35 mm thread length covers most common plate and flange thicknesses. The 12 mm square drive allows positive torque transfer without slippage. Use it on general-purpose steels, aluminium, brass, and other non-ferrous metals with appropriate cutting fluid. For best results, pre-drill to the recommended minor diameter for M20 x 1.5 fine threads.

Full specifications

• Thread type: Metric fine
• Nominal thread diameter: M20
• Thread pitch: 1.5 mm
• Thread standard: DIN 2181
• Thread tolerance class: 6H
• Material: HSS (High-Speed Steel)
• Flute type: Straight flute
• Cutting direction: Right-hand cut
• Application: Machine tapping
• Recommended material: General purpose steels, non-ferrous metals
• Overall length (L1): 110 mm
• Thread length (L2): 35 mm
• Shank diameter (d2): 16 mm
• Square drive size (a): 12 mm
• Number of flutes: 4
• Surface treatment: Bright
• Tool type: Threading tap

Final note

Precision-ground to DIN 2181, this tap provides consistent 6H threads in demanding production environments.