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) M15 × 1 For Go ITM6015MG 12 3 For Not-go 6H 95 47 48 12.5 10 13 △ ITM6015MN 10 4 M16 × 2 For Go ITM6016QG 20 3 For Not-go 6H 95 47 48 12.5 10 13 △ (for through hole) Spiral Fluted Taps ITM6016QN 12 4 M16 × 1.5 For Go ITM6016OG 20 3 For Not-go 6H 95 47 48 12.5 10 13 △ ITM6016ON 12 4 M16 × 1 For Go ITM6016MG 12 3 For Not-go 6H 95 47 48 12.5 10 13 △ ITM6016MN 8 4 (for through hole) Spiral Pointed Taps M17 × 1.5 For Go ITM6017OG 19 3 For Not-go 6H 100 49 51 14 11 14 △ ITM6017ON 10 4 M17 × 1 For Go ITM6017MG 12 3 For Not-go 6H 100 49 51 14 11 14 △ ITM6017MN 10 4 Hand Taps M18 × 2.5 For Go ITM6018RG 25 3 For Not-go 6H 100 49 51 14 11 14 △ ITM6018RN 16 4 M18 × 2 For Go ITM6018QG 20 3 For Not-go 6H 100 49 51 14 11 14 △ ITM6018QN 12 4 Carbide Taps Cemented M18 × 1.5 For Go ITM6018OG 20 3 For Not-go 6H 100 49 51 14 11 14 △ ITM6018ON 12 4 M18 × 1 For Go ITM6018MG 12 3 For Not-go 6H 100 49 51 14 11 14 △ ITM6018MN 8 4 M20 × 2.5 For Go ITM6020RG 25 5 Roll Taps For Not-go 6H 105 55 50 15 12 15 △ ITM6020RN 16 6 M20 × 2 For Go ITM6020QG 20 5 For Not-go 6H 105 55 50 15 12 15 △ ITM6020QN 12 6 M20 × 1.5 For Go ITM6020OG 20 5 Simple Inspection Tools Special Thread Taps For Not-go 6H 105 55 50 15 12 15 △ ITM6020ON 12 6 M20 × 1 For Go ITM6020MG 14 5 For Not-go 6H 105 55 50 15 12 15 △ ITM6020MN 8 6 M22 × 2.5 For Go ITM6022RG 33 5 Pipe Taps For Not-go 6H 115 60 55 17 13 16 △ ITM6022RN 16 6 M22 × 2 For Go ITM6022QG 20 5 For Not-go 6H 115 60 55 17 13 16 △ ITM6022QN 14 6 M22 × 1.5 For Go ITM6022OG 20 5 Thread Mills For Not-go 6H 115 60 55 17 13 16 △ ITM6022ON 14 6 M22 × 1 For Go ITM6022MG 14 5 For Not-go 6H 115 60 55 17 13 16 △ ITM6022MN 8 6 M24 × 3 For Go ITM6024SG 30 5 For Not-go 6H 120 65 55 19 15 18 △ Dies ITM6024SN 20 6 M24 × 2 For Go ITM6024QG 20 5 For Not-go 6H 120 65 55 19 15 18 △ ITM6024QN 14 6 M24 × 1.5 For Go ITM6024OG 20 5 For Not-go 6H 120 65 55 19 15 18 △ Center Drills ITM6024ON 14 6 M24 × 1 For Go ITM6024MG 14 5 For Not-go 6H 120 65 55 19 15 18 △ ITM6024MN 8 6 For Unified Threads № 2-56UNC For Go ITM2UN2EG 4.5 1 Centering Tools For Not-go 2B 42 12 26 3 2.5 5 △ ITM2UN2EN 3.5 2 № 2-64UNF For Go ITM2UN2DG 4.5 1 For Not-go 2B 42 12 26 3 2.5 5 △ ITM2UN2DN 3.5 2 JIS ◎=Standard ○=Semi standard △=Made to order ST-6 For improvement, spec may change without advance notice. 529