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

Unit:mm Unit:mm

Nominal sizeBored hole sizeBored hole size
Max.Min.( ref.)
STI M2.6×0.452.7982.6982.77
STI M 3×0.53.2213.1093.19
STI M 4×0.74.2914.1514.26
STI M 5×0.85.3335.1735.29
STI M 6×16.4066.2166.36
STI M 8×1.258.4838.2718.43
STI M10×1.510.56110.32510.50
STI M10×1.2510.48310.27110.43
STI M10×110.40610.21610.36
STI M12×1.7512.64412.37912.6
STI M12×1.512.56112.32512.50
STI M12×1.2512.48312.27112.43
STI M14×214.73314.43314.7
STI M14×1.514.56114.32514.50
STI M14×1.2514.48314.27114.43
STI M16×216.73316.43316.7
STI M16×1.516.56116.32516.50
STI M18×2.518.89718.54218.8
STI M18×1.518.56118.32518.50
STI M20×2.520.89720.54220.8
STI M20×1.520.56120.32520.50
STI M22×2.522.89722.54222.8
STI M22×1.522.56122.32522.50
STI M24×325.04924.64924.9
STI M24×224.73324.43324.7
STI M24×1.524.56124.32524.50
SizeMinor diameter of i Max.nternal threads (D1) Min.Bored hole size ( ref.)
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 UNC11.78311.50711.7
STI7/16- 20 UNF11.58411.38711.53
STI1/2- 13 UNC13.39313.12213.3
STI1/2- 20 UNF13.17212.97513.12
STI5/8- 11 UNC16.67216.37616.60
STI5/8- 18 UNF16.38516.18016.33
STI3/4- 10 UNC19.90819.59919.8
STI3/4- 16 UNF19.60819.39319.55
  • The figures listed above are according to the data provided by helical coil wire insert manufacturers.

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