Machine Tap, ≈ DIN 371, HSS-E, UNF  No. 6 x 40 

for general use - non abrasive material up to 900 N/mm² - unalloyed and low alloyed steel - for through holes Thread type: Unified Fine thread ANSI B 1.1 Norm: ≈ DIN 371 Material: HSS-E