Overall Thread Thread+Neck Shank Shank Size of Length of length length length length dia. square square L ℓ ℓn ℓs Ds K ℓk SIT Simple Thread Inspection Tools Size Class Code L ℓ ℓn ℓs Ds K ℓk Type Stock (for blind hole) Spiral Fluted Taps (mm) (mm) (mm) (mm) (mm) (mm) (mm) 9/16-12UNC For Go ITM2U09SG 26 3 For Not-go 2B 95 47 48 12.5 10 13 △ ITM2U09SN 17 4 9/16-18UNF For Go ITM2U09OG 20 3 For Not-go 2B 95 47 48 12.5 10 13 △ (for through hole) Spiral Fluted Taps ITM2U09ON 13 4 5/8-11UNC For Go ITM2U10UG 26 3 For Not-go 2B 95 47 48 12.5 10 13 △ ITM2U10UN 17 4 5/8-18UNF For Go ITM2U10OG 20 3 For Not-go 2B 95 47 48 12.5 10 13 △ ITM2U10ON 13 4 (for through hole) Spiral Pointed Taps Hand Taps Carbide Taps Cemented Roll Taps Simple Inspection Tools Special Thread Taps Pipe Taps Thread Mills Dies Center Drills Centering Tools JIS ◎=Standard ○=Semi standard △=Made to order ST-8 For improvement, spec may change without advance notice. 531