WHITE RING machine tap, DIN 371, HSS-E, UNC 5/16 x 18 

stainless steel, long chipping up to 1.000 N/mm² -abrasive material - chrome-nickel alloys - for through holes VAP-coating: - improved adhesion of the coolant and Lubricant - reduces tearing of the lubricating filand the formation of cold welding Thread type: Unified Coarse thread ANSI B 1.1 Norm: DIN 371 Material: HSS-E