■ for Helical Coil Wire Thread Inserts, Metric Threads ■ for Helical Coil Wire Thread Inserts, Unified Threads

Unit : mm unit: mm

Nominal sizeBored hBored hole size ole size
( ref.)
STI M 2×0.42.15
STI M 2.5×0.452.66
STI M 2.6×0.452.76
STI M 3×0.53.18
STI M 4×0.74.27
STI M 5×0.85.29
STI M 6×16.38
STI M 8×1.258.47
STI M10×1.510.56
STI M10×1.2510.47
STI M10×110.38
STI M12×1.7512.66
STI M12×1.512.56
STI M12×1.2512.47
STI M14×214.75
STI M14×1.514.56
STI M14×1.2514.47
STI M16×216.75
STI M16×1.516.56
STI M18×2.518.93
STI M18×1.518.56
STI M20×2.520.93
STI M20×1.520.56
STI M22×2.522.93
STI M22×1.522.56
STI M24×325.11
STI M24×1.524.56
SizeMinor diameter of i Max.nternal threads (D1) Min.Bored hole size ( ref.)
STI No.2 -56 UNC2.4402.2842.40
STI No.4 -40 UNC3.1802.9853.13
STI No.4 -48 UNF3.1212.9623.08
STI No.5 -40 UNC3.4873.3153.44
STI No.6 -32 UNC3.8783.6783.83
STI No.6 -40 UNF3.8173.6453.77
STI No.8 -32 UNC4.5234.3394.48
STI No.8 -36 UNF4.4984.3214.45
STI No.10 -24 UNC5.2835.0555.23
STI No.10 -32 UNF5.1844.9995.14
STI No.12 -24 UNC5.9435.7155.89
STI1/4 -20 UNC6.8686.6256.81
STI1/4 -28 UNF6.7206.5466.68
STI5/16 -18 UNC8.4888.2438.43
STI5/16 -24 UNF8.3518.1678.31
STI3/8 -16 UNC10.1269.86810.06
STI3/8 -24 UNF9.9319.7549.89
STI7/16 -14 UNC11.78311.50711.71
STI7/16 -20 UNF11.58411.38711.53
STI1/2 -13 UNC13.39313.12213.33
STI1/2 -20 UNF13.17212.97513.12
STI5/8 -11 UNC16.67216.37616.60
STI5/8 -18 UNF16.38516.18016.33
STI3/4 -16 UNF19.60819.39319.55
  • The figures listed above are according to the data provided by helical coil wire insert manufacturers.