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

Unit:mm Unit:mm

MajorPitch DiameterMinorMajorPitch DiameterMinor
DiameterDiameterDiameterDiameter

Size Class Upper Lower Size Class Upper Lower

BasicTolerance Tolerance BasicBasicBasicBasicTolerance ToleranceBasic
SizeSize ( μ m)( μ m)SizeSizeSize( μ m)( μ m)Size
STI M 2.6 ×0.45Ⅰb3.1852.892 1862.698Ⅰb186
STI No. 2 -56 UNC2.7732.4792.283
Ⅰb186GH225.4 12.7
STI M 3×0.53.6503.3243.108
G33825Ⅰb186
STI No. 4 -40 UNC3.6703.2582.981
Ⅰb186GH225.4 12.7
STI M 4×0.74.9094.4544.151
G45138STI No. 4 -48 UNFⅠb3.5323.1891862.958
Ⅰb186STI No. 5 -40 UNCⅠb4.0003.5891863.312
STI M 5×0.86.0395.5195.173
G45138Ⅰb186
STI No. 6 -32 UNC4.5364.0213.678
Ⅰb186GH338.1 25.4
STI M 6×17.2996.6496.216
G45138STI No. 6 -40 UNFⅠb4.3303.9191863.642
Ⅰb186Ⅰb186
STI M 8×1.259.6248.8128.271 STI No. 8 -32 UNC5.1974.6814.338
G45138GH338.1 25.4
Ⅰb227STI No. 8 -36 UNFⅠb5.0834.6251864.318
STI M 10 ×1.511.948 10.97410.324
G56451Ⅰb186
STI No. 10 -24 UNC6.2015.5135.055
STI M 10 ×1.25Ⅰb11.624 10.812186 10.271GH225.4 12.7
STI M 10 × 1Ⅰb11.299 10.649186 10.216Ⅰb186
STI No. 10 -32 UNF5.8575.3414.998
Ⅰb227GH225.4 12.7
STI M 12 × 1.7514.273 13.13612.379
G67664STI No. 12 -24 UNCⅠb6.8616.1731865.716
STI M 12 × 1.5Ⅰb13.948 12.974217 12.324Ⅰb227
STI1/4 - 20 UNC8.0007.1746.626
STI M 12 × 1.25Ⅰb13.624 12.812217 12.271GH338.1 25.4
STI M 14 × 2Ⅰb16.598 15.299227 14.433Ⅰb186
STI1/4 - 28 UNF7.5286.9396.545
STI M 14 × 1.5Ⅰb15.948 14.974217 14.324GH225.4 12.7
STI M 16 × 2Ⅰb18.598 17.299227 16.433Ⅰb227
STI5/16 - 18 UNC9.7718.8548.244
STI M 16 × 1.5Ⅰb17.948 16.974217 16.324GH338.1 25.4
STI M 18 × 2.5Ⅰb21.248 19.6243010 18.542STI5/16 - 24 UNF Ⅰb9.3138.6241868.167
STI M 18 × 1.5Ⅰb19.948 18.974248 18.324Ⅰb227
STI3/ 8 - 16 UNC11.587 10.5569.867
STI M 20 × 2.5Ⅰb23.248 21.6243010 20.542GH338.1 25.4
STI M 20 × 1.5Ⅰb21.948 20.974248 20.324STI3/ 8 - 24 UNF Ⅰb 10.900 10.2121869.754
STI M 22 × 2.5Ⅰb25.248 23.6243010 22.542Ⅰb3010
STI7/ 16 - 14 UNC13.469 12.29111.506
STI M 22 × 1.5Ⅰb23.948 22.974248 22.324GH338.1 25.4
STI M 24 × 3Ⅰb27.897 25.9483010 24.649Ⅰb186
STI7/ 16 - 20 UNF12.762 11.93711.388
STI M 24 × 1.5Ⅰb25.948 24.974248 24.324GH338.1 25.4
Ⅰb3010
STI1/2 - 13 UNC15.238 13.96813.122

GH3 38.1 25.4

STI1/2 - 20 UNFⅠb 14.350 13.524186 12.976
STI5/ 8 - 11 UNCⅠb18.875 17.3763010 16.376
STI5/ 8 - 18 UNFⅠb17.708 16.791217 16.181
STI3/4 - 16 UNFⅠb21.112 20.081217 19.392

Technical Inf