Special Thread Taps / Simple Inspection Tools SIT Simple Thread Inspection Tools Spiral Fluted Taps (for blind hole) Size Class Code L ℓ ℓn ℓs Ds K ℓk Type Stock (mm) (mm) (mm) (mm) (mm) (mm) (mm) № 3-48UNC For Go ITM2UN3FG 6.5 1 For Not-go 2B 46 14 28 3 2.5 5 △ ITM2UN3FN 3.5 2 № 3-56UNF For Go ITM2UN3EG 6.5 1 Spiral Fluted Taps (for through hole) For Not-go 2B 46 14 28 3 2.5 5 △ ITM2UN3EN 3.5 2 № 4-40UNC For Go ITM2UN4HG 6.5 1 For Not-go 2B 46 14 25 4 3.2 6 △ ITM2UN4HN 3.5 2 № 4-48UNF For Go ITM2UN4FG 6.5 1 For Not-go 2B 46 14 25 4 3.2 6 △ Spiral Pointed Taps (for through hole) ITM2UN4FN 3.5 2 № 5-40UNC For Go ITM2UN5HG 6.5 1 For Not-go 2B 52 16 28 5 4 7 △ ITM2UN5HN 3.5 2 № 5-44UNF For Go ITM2UN5GG 6.5 1 For Not-go 2B 52 16 28 5 4 7 △ Hand Taps ITM2UN5GN 3.5 2 № 6-32UNC For Go ITM2UN6JG 7 1 For Not-go 2B 52 16 28 5 4 7 △ ITM2UN6JN 3.5 2 № 6-40UNF For Go ITM2UN6HG 7 1 For Not-go 2B 52 16 28 5 4 7 △ Cemented Carbide Taps ITM2UN6HN 3.5 2 № 8-32UNC For Go ITM2UN8JG 9 1 For Not-go 2B 60 21 32 5.5 4.5 7 △ ITM2UN8JN 5 2 № 8-36UNF For Go ITM2UN8IG 9 1 For Not-go 2B 60 21 32 5.5 4.5 7 △ ITM2UN8IN 5 2 Roll Taps № 10-24UNC For Go ITM2UNAMG 9.5 1 For Not-go 2B 60 22 32 5.5 4.5 7 △ ITM2UNAMN 5 2 № 10-32UNF For Go ITM2UNAJG 9.5 1 For Not-go 2B 60 22 32 5.5 4.5 7 △ ITM2UNAJN 5 2 Special Thread Taps Simple Inspection Tools № 12-24UNC For Go ITM2UNCMG 9.5 1 For Not-go 2B 62 26 32 6 4.5 7 △ ITM2UNCMN 5 2 № 12-28UNF For Go ITM2UNCKG 9.5 1 For Not-go 2B 62 26 32 6 4.5 7 △ ITM2UNCKN 5 2 Pipe Taps 1/4-20UNC For Go ITM2U04NG 15 1 For Not-go 2B 62 26 32 6 4.5 7 △ ITM2U04NN 10 2 1/4-28UNF For Go ITM2U04KG 12 1 For Not-go 2B 62 26 32 6 4.5 7 △ ITM2U04KN 7 2 Thread Mills 5/16-18UNC For Go ITM2U05OG 15 3 For Not-go 2B 70 34 36 6.2 5 8 △ ITM2U05ON 10 4 5/16-24UNF For Go ITM2U05MG 15 3 For Not-go 2B 70 34 36 6.2 5 8 △ ITM2U05MN 7 4 3/8-16UNC For Go ITM2U06PG 17 3 Dies For Not-go 2B 75 37 38 7 5.5 8 △ ITM2U06PN 10 4 3/8-24UNF For Go ITM2U06MG 17 3 For Not-go 2B 75 37 38 7 5.5 8 △ ITM2U06MN 10 4 7/16-14UNC For Go ITM2U07QG 17 3 Center Drills For Not-go 2B 82 40 42 8.5 6.5 9 △ ITM2U07QN 10 4 7/16-20UNF For Go ITM2U07NG 17 3 For Not-go 2B 82 40 42 8.5 6.5 9 △ ITM2U07NN 10 4 1/2-13UNC For Go ITM2U08RG 17 3 For Not-go 2B 88 43 45 10.5 8 11 △ Centering Tools ITM2U08RN 13 4 1/2-20UNF For Go ITM2U08NG 17 3 For Not-go 2B 88 43 45 10.5 8 11 △ ITM2U08NN 10 4 JIS ST-7 ◎=Standard ○=Semi standard △=Made to order 530 For improvement, spec may change without advance notice.