
10. Tap Thread Limits (JIS, DIN, ANSI) Intro Helical Coil Wire Thread Inserts, Helical Coil Wire Thread Inserts, Metric Threads EG(STI)M-MF Unit: mm Unified Threads EG(STI) UNC/UNF Unit: mm Major diameter Pitch Diameter Minor diameter Major diameter Pitch Diameter Minor diameter SP Size Class Upper Lower Size Class Upper Lower Basic Basic Basic Basic Basic Basic Tolerance Tolerance Tolerance Tolerance Size Size Size Size Size Size (μm) + (μm) + (μm) + (μm) + STI M 2.6 × 0.45 Ib 3.185 2.892 18 6 2.698 Ib 18 6 STI No. 2 - 56 UNC 2.773 2.479 2.283 Ib 18 6 GH2 25.4 12.7 SL STI M 3 × 0.5 3.650 3.324 3.108 G3 38 25 Ib 18 6 STI No. 4 - 40 UNC 3.670 3.258 2.981 Ib 18 6 GH2 25.4 12.7 STI M 4 × 0.7 4.909 4.454 4.151 G4 51 38 STI No. 4 - 48 UNF Ib 3.532 3.189 18 6 2.958 STI M 5 × 0.8 Ib 6.039 5.519 18 6 5.173 STI No. 5 - 40 UNC Ib 4.000 3.589 18 6 3.312 PO G4 51 38 Ib 18 6 STI No. 6 - 32 UNC 4.536 4.021 3.678 Ib 18 6 GH3 38.1 25.4 STI M 6 × 1 7.299 6.649 6.216 G4 51 38 STI No. 6 - 40 UNF Ib 4.330 3.919 18 6 3.642 Ib 18 6 Ib 18 6 STI M 8 × 1.25 9.624 8.812 8.271 STI No. 8 - 32 UNC 5.197 4.681 4.338 ST G4 51 38 GH3 38.1 25.4 Ib 22 7 STI No. 8 - 36 UNF Ib 5.083 4.625 18 6 4.318 STI M 10 × 1.5 11.948 10.974 10.324 G5 64 51 Ib 18 6 STI No. 10 - 24 UNC 6.201 5.513 5.055 STI MF 10 × 1.25 Ib 11.624 10.812 18 6 10.271 GH2 25.4 12.7 STI MF 10 × 1 Ib 11.299 10.649 18 6 10.216 Ib 18 6 ROLL STI No. 10 - 32 UNF 5.857 5.341 4.998 Ib 22 7 GH2 25.4 12.7 STI M 12 × 1.75 14.273 13.136 12.379 G6 76 64 STI No. 12 - 24 UNC Ib 6.861 6.173 18 6 5.716 STI MF 12 × 1.5 Ib 13.948 12.974 21 7 12.324 Ib 22 7 STI MF 12 × 1.25 Ib 13.624 12.812 21 7 12.271 STI 1/4 - 20 UNC GH3 8.000 7.174 38.1 25.4 6.626 CARBIDE STI M 14 × 2 Ib 16.598 15.299 22 7 14.433 Ib 7.528 6.939 18 6 6.545 STI 1/4 - 28 UNF STI MF 14 × 1.5 Ib 15.948 14.974 21 7 14.324 GH2 25.4 12.7 STI M 16 × 2 Ib 18.598 17.299 22 7 16.433 Ib 9.771 8.854 22 7 8.244 STI 5/16 - 18 UNC STI MF 16 × 1.5 Ib 17.948 16.974 21 7 16.324 GH3 38.1 25.4 LONG STI M 18 × 2.5 Ib 21.248 19.624 30 10 18.542 STI 5/16 - 24 UNF Ib 9.313 8.624 18 6 8.167 STI MF 18 × 1.5 Ib 19.948 18.974 24 8 18.324 Ib 11.587 10.556 22 7 9.867 STI 3/8 - 16 UNC STI M 20 × 2.5 Ib 23.248 21.624 30 10 20.542 GH3 38.1 25.4 STI MF 20 × 1.5 Ib 21.948 20.974 24 8 20.324 STI 3/8 - 24 UNF Ib 10.900 10.212 18 6 9.754 HAND STI M 22 × 2.5 Ib 25.248 23.624 30 10 22.542 Ib 13.469 12.291 30 10 11.506 TAPS STI 7/16 - 14 UNC STI MF 22 × 1.5 Ib 23.948 22.974 24 8 22.324 GH3 38.1 25.4 STI M 24 × 3 Ib 27.897 25.948 30 10 24.649 Ib 12.762 11.937 18 6 11.388 STI 7/16 - 20 UNF STI MF 24 × 1.5 Ib 25.948 24.974 24 8 24.324 GH3 38.1 25.4 EG (STI) Ib 15.238 13.968 30 10 13.122 STI 1/2 - 13 UNC GH3 38.1 25.4 Miniature Screw Threads (S) Unit: mm STI 1/2 - 20 UNF Ib 14.350 13.524 18 6 12.976 Major Pitch Diameter Minor STI 5/8 - 11 UNC Ib 18.875 17.376 30 10 16.376 SPECIAL diameter diameter Size Class STI 5/8 - 18 UNF Ib 17.708 16.791 21 7 16.181 THREADS, Upper Lower Basic Basic Tolerance Tolerance Basic GAUGES Size Size Size STI 3/4 - 16 UNF Ib 21.112 20.081 21 7 19.392 (μm) + (μm) + S 0.5 × 0.125 - 0.500 0.419 15 7 0.380 S 0.6 × 0.15 - 0.600 0.503 15 7 0.456 European Steel Conduit Threads (Pg) Unit: mm THREAD GS2 23 13 Major Minor MILLS - 20 10 Pitch Diameter diameter diameter S 0.7 × 0.175 0.700 0.586 0.532 Size Class GS3 28 18 Upper Lower Basic Basic Basic Tolerance Tolerance - 20 10 Size Size Size (μm) + (μm) + S 0.8 × 0.2 0.800 0.670 0.608 GS3 28 18 Pg 7 - 20 - 12.50 11.89 60 30 11.28 DIES - 20 10 Pg 9 - 18 - 15.20 14.53 60 30 13.86 S 0.9 × 0.225 0.900 0.754 0.684 GS4 33 23 Pg 11 - 18 - 18.60 17.93 60 30 17.26 Pg 13.5 - 18 - 20.40 19.73 60 30 19.06 Pg 16 - 18 - 22.50 21.83 60 30 21.16 CENTER Pg 21 - 16 - 28.30 27.54 100 50 26.78 DRILLS Pg 29 - 16 - 37.00 36.24 100 50 35.48 Technical info 681