Special Thread Taps / Simple Inspection ToolsOverall lengthGO partNOT-GO partRecess lengthThread+Neck lengthShank lengthShank dia.Size of squareLength of square
SITD SimpleThread InspectionTools, Tandem LType ℓ1ℓ2ℓ3ℓnℓsDsKℓk
SizeClassCodeL (mm)ℓ1 (mm)ℓ2 (mm)ℓ3 (mm)ℓn (mm)ℓs (mm)Ds (mm)K (mm)ℓk (mm)TypeStock
M15×16HITDM6015M9518.953474812.510132
M16×26HITDM6016Q9510106474812.510132
M16×1.56HITDM6016O95147.54.5474812.510132
M16×16HITDM6016M951853474812.510132
M17×1.56HITDM6017O10021.97.54.549511411142
M17×16HITDM6017M10025.95349511411142
M18×2.56HITDM6018R1001312.57.549511411142
M18×26HITDM6018Q1001710649511411142
M18×1.56HITDM6018O100217.54.549511411142
M18×16HITDM6018M100255349511411142
For Unified Threads
SizeClassCodeL (mm)ℓ1 (mm)ℓ2 (mm)ℓ3 (mm)ℓn (mm)ℓs (mm)Ds (mm)K (mm)ℓk (mm)TypeStock
No.2-56UNC2BITDM2UN2E424.42.31.4122632.551
No.2-64UNF2BITDM2UN2D424.921.2122632.551
No.3-48UNC2BITDM2UN3F463.92.61.6142832.551
No.3-56UNF2BITDM2UN3E464.42.31.4142832.551
No.4-40UNC2BITDM2UN4H463.93.21.9142543.261
No.4-48UNF2BITDM2UN4F464.82.61.6142543.261
No.5-40UNC2BITDM2UN5H525.93.21.916285471
No.5-44UNF2BITDM2UN5G526.42.91.716285471
No.6-32UNC2BITDM2UN6J524.642.416285471
No.6-40UNF2BITDM2UN6H525.93.21.916285471
No.8-32UNC2BITDM2UN8J606.642.421325.54.571
No.8-36UNF2BITDM2UN8I607.43.52.121325.54.571
No.10-24UNC2BITDM2UNAM627.55.33.2263264.571
No.10-32UNF2BITDM2UNAJ629.642.4263264.571
No.12-24UNC2BITDM2UNCM626.55.33.2263264.571
No.12-28UNF2BITDM2UNCK627.84.52.7263264.571
1/4-20UNC2BITDM2U04N7010.26.43.834366.2582
1/4-28UNF2BITDM2U04K7013.24.52.734366.2582
5/16-18UNC2BITDM2U05O707.77.14.234366.2582
5/16-24UNF2BITDM2U05M7010.55.33.234366.2582
3/8-16UNC2BITDM2U06P7510.77.94.8373875.582
3/8-24UNF2BITDM2U06M7514.95.33.2373875.582
7/16-14UNC2BITDM2U07Q8212.39.15.440428.56.592
7/16-20UNF2BITDM2U07N8216.66.43.840428.56.592
1/2-13UNC2BITDM2U08R8811.49.85.9434510.58112
1/2-20UNF2BITDM2U08N8816.96.43.8434510.58112
9/16-12UNC2BITDM2U09S9510.510.66.4474812.510132
9/16-18UNF2BITDM2U09O9516.27.14.2474812.510132
5/8-11UNC2BITDM2U10U10016.411.56.949511411142
5/8-18UNF2BITDM2U10O10023.57.14.249511411142