3306E5/16X18X4H5 1321062 UNC Extension Roll Form Tap 5/16 inch x 18

Thread forming tap with lube grooves with a 1-2xP bottoming lead, for Unified National Coarse thread UNC 5/16" with 18 TPI and 2B class of fit with H5 pitch diameter limits, dimensions according to ANSI standard with 0.3180" shank and 0.2380" square drive, HSS with bright finish for 2.5xD through or blind hole threading in free machining, plain carbon and alloy steel and wrought or cast aluminium and copper or copper alloys.