
Whitworth Threads (BSW) Unit: mm Helical Coil Wire Thread Inserts Metric Coarse (EG STI M) Unit: mm
SP
| Size | Minor D Max. | iameter Min. | Drill Size | Recommended Hole Size | ||
| BSW | 1/16 - | 60 | 1.23 | 1.107 | 1.15 | 1.20 |
| BSW | 3/32 - | 48 | 1.914 | 1.785 | 1.85 | 1.88 |
| BSW | 1/8 - | 40 | 2.591 | 2.456 | 2.55 | 2.56 |
| BSW | 5/32 - | 32 | 3.214 | 3.071 | 3.15 | 3.20 |
| BSW | 3/16 - | 24 | 3.745 | 3.563 | 3.70 | 3.70 |
| BSW | 7/32 - | 24 | 4.54 | 4.358 | 4.50 | 4.49 |
| BSW | 1/4 - | 20 | 5.204 | 4.914 | 5.10 | 5.13 |
| BSW | 5/16 - | 18 | 6.67 | 6.34 | 6.50 | 6.59 |
| BSW | 3/8 - | 16 | 8.113 | 7.733 | 8.00 | 8.02 |
| BSW | 7/16 - | 14 | 9.508 | 9.048 | 9.30 | 9.39 |
| BSW | 1/2 - | 12 | 10.83 | 10.31 | 10.60 | 10.70 |
| BSW | 9/16 - | 12 | 12.418 | 11.898 | 12.25 | 12.29 |
| BSW | 5/8 - | 11 | 13.817 | 13.257 | 13.50 | 13.68 |
| BSW | 3/4 - | 10 | 16.778 | 16.178 | 16.50 | 16.63 |
| BSW | 7/8 - | 9 | 19.691 | 19.031 | 19.50 | 19.53 |
| BSW | 1 - | 8 | 22.514 | 21.814 | 22.20 | 22.34 |
| BSW | 1 1/8 - | 7 | 25.229 | 24.469 | 24.75 | 25.04 |
| BSW | 1 1/4 - | 7 | 28.404 | 27.644 | 28.00 | 28.21 |
| BSW | 1 3/8 - | 6 | 30.923 | 30.123 | 30.50 | 30.72 |
| BSW | 1 1/2 - | 6 | 34.098 | 33.298 | 33.75 | 33.90 |
| BSW | 1 5/8 - | 5 | 36.409 | 35.529 | 36.00 | 36.19 |
| BSW | 1 3/4 - | 5 | 39.584 | 38.704 | 39.20 | 39.36 |
| BSW | 1 7/8 - | 4 1/2 | 42.227 | 41.237 | 42.00 | 41.98 |
| BSW | 2 - | 4.5 | 45.402 | 44.412 | 45.00 | 45.15 |
| BSW | 2 1/4 - | 4 | 51.068 | 49.958 | 50.50 | 50.79 |
| BSW | 2 1/2 - | 4 | 57.418 | 56.308 | 57.00 | 57.14 |
| BSW | 2 3/4 - | 3 1/2 | 62.816 | 61.636 | 62.50 | 62.52 |
| BSW | 3 - | 3 1/2 | 69.166 | 67.986 | 68.50 | 68.87 |
| BSW | 3 1/4 - | 3 1/4 | 74.902 | 73.702 | 74.50 | 74.60 |
| BSW | 3 1/2 - | 3 1/4 | 81.252 | 80.052 | 81.00 | 81.10 |
| BSW | 3 3/4 - | 3 | 86.908 | 85.668 | 86.50 | 86.60 |
| BSW | 4 - | 3 | 93.258 | 92.018 | 92.80 | 92.95 |
| Si | ze | Minor D Max. | iameter Min. | Drill Size | Recommended Hole Size | |||
| EG(STI) | M | 2 | × | 0.4 | 2.16 | 2.10 | 2.13 | 2.15 |
| EG(STI) | M | 2.5 | × | 0.45 | 2.68 | 2.60 | 2.60 | 2.66 |
| EG(STI) | M | 2.6 | × | 0.45 | 2.78 | 2.70 | 2.70 | 2.76 |
| EG(STI) | M | 3 | × | 0.5 | 3.20 | 3.12 | 3.15 | 3.18 |
| EG(STI) | M | 4 | × | 0.7 | 4.30 | 4.17 | 4.20 | 4.27 |
| EG(STI) | M | 5 | × | 0.8 | 5.33 | 5.16 | 5.20 | 5.29 |
| EG(STI) | M | 6 | × | 1 | 6.42 | 6.25 | 6.30 | 6.38 |
| EG(STI) | M | 8 | × | 1.25 | 8.52 | 8.31 | 8.40 | 8.47 |
| EG(STI) | M | 10 | × | 1.5 | 10.62 | 10.37 | 10.50 | 10.56 |
| EG(STI) | M | 12 | × | 1.75 | 12.73 | 12.43 | 12.60 | 12.66 |
| EG(STI) | M | 14 | × | 2 | 14.83 | 14.49 | 14.70 | 14.75 |
| EG(STI) | M | 16 | × | 2 | 16.83 | 16.49 | 16.70 | 16.75 |
| EG(STI) | M | 18 | × | 2.5 | 19.04 | 18.58 | 18.90 | 18.93 |
| EG(STI) | M | 20 | × | 2.5 | 21.04 | 20.58 | 20.90 | 20.93 |
| EG(STI) | M | 22 | × | 2.5 | 23.04 | 22.58 | 22.90 | 22.93 |
| EG(STI) | M | 24 | × | 3 | 25.25 | 24.70 | 25.10 | 25.11 |
| Si | ze | Minor Di Max. | ameter Min. | Drill Size | Recommended Hole Size | |||
| EG(STI) | MF | 10 | × | 1.25 | 10.52 | 10.31 | 10.40 | 10.47 |
| EG(STI) | MF | 10 | × | 1 | 10.42 | 10.25 | 10.30 | 10.38 |
| EG(STI) | MF | 12 | × | 1.5 | 12.62 | 12.37 | 12.50 | 12.56 |
| EG(STI) | MF | 12 | × | 1.25 | 12.52 | 12.31 | 12.40 | 12.47 |
| EG(STI) | MF | 14 | × | 1.5 | 14.62 | 14.37 | 14.50 | 14.56 |
| EG(STI) | MF | 14 | × | 1.25 | 14.52 | 14.31 | 14.40 | 14.47 |
| EG(STI) | MF | 16 | × | 1.5 | 16.62 | 16.37 | 16.50 | 16.56 |
| EG(STI) | MF | 18 | × | 1.5 | 18.62 | 18.37 | 18.50 | 18.56 |
| EG(STI) | MF | 20 | × | 1.5 | 20.62 | 20.37 | 20.50 | 20.56 |
| EG(STI) | MF | 22 | × | 1.5 | 22.62 | 22.37 | 22.50 | 22.56 |
| EG(STI) | MF | 24 | × | 1.5 | 24.62 | 24.37 | 24.50 | 24.56 |
THREADS,
GAUGES Helical Coil Wire Thread Inserts Unified Coarse (EG STI UNC) Unit: mm Helical Coil Wire Thread Inserts Unified Fine (EG STI UNF) Unit: mm
| Size | Minor Di Max. | ameter Min. | Drill Size | Recommended Hole Size | |||||
| EG(STI) | No. | 2 | - | 56 | UNC | 2.440 | 2.284 | 2.35 | 2.4 |
| EG(STI) | No. | 4 | - | 40 | UNC | 3.180 | 2.985 | 3.10 | 3.13 |
| EG(STI) | No. | 5 | - | 40 | UNC | 3.487 | 3.315 | 3.40 | 3.44 |
| EG(STI) | No. | 6 | - | 32 | UNC | 3.878 | 3.678 | 3.80 | 3.83 |
| EG(STI) | No. | 8 | - | 32 | UNC | 4.523 | 4.339 | 4.40 | 4.48 |
| EG(STI) | No. | 10 | - | 24 | UNC | 5.283 | 5.055 | 5.20 | 5.23 |
| EG(STI) | No. | 12 | - | 24 | UNC | 5.943 | 5.715 | 5.80 | 5.89 |
| EG(STI) | 1/4 | - | 20 | UNC | 6.868 | 6.625 | 6.80 | 6.81 | |
| EG(STI) | 5/16 | - | 18 | UNC | 8.488 | 8.243 | 8.40 | 8.43 | |
| EG(STI) | 3/8 | - | 16 | UNC | 10.126 | 9.868 | 10.00 | 10.06 | |
| EG(STI) | 7/16 | - | 14 | UNC | 11.783 | 11.507 | 11.70 | 11.71 | |
| EG(STI) | 1/2 | - | 13 | UNC | 13.393 | 13.122 | 13.20 | 13.33 | |
| EG(STI) | 5/8 | - | 11 | UNC | 16.672 | 16.376 | 16.50 | 16.60 |
| Size | Minor Di Max. | ameter Min. | Drill Size | Recommended Hole Size | ||||
| EG(STI) | No. | 4 | - 48 | UNF | 3.121 | 2.962 | 3.00 | 3.08 |
| EG(STI) | No. | 6 | - 40 | UNF | 3.817 | 3.645 | 3.70 | 3.77 |
| EG(STI) | No. | 8 | - 36 | UNF | 4.498 | 4.321 | 4.40 | 4.45 |
| EG(STI) | No. | 10 | - 32 | UNF | 5.184 | 4.999 | 5.10 | 5.14 |
| EG(STI) | 1/4 | - 28 | UNF | 6.720 | 6.546 | 6.60 | 6.68 | |
| EG(STI) | 5/16 | - 24 | UNF | 8.351 | 8.167 | 8.30 | 8.31 | |
| EG(STI) | 3/8 | - 24 | UNF | 9.931 | 9.754 | 9.80 | 9.89 | |
| EG(STI) | 7/16 | - 20 | UNF | 11.584 | 11.387 | 11.50 | 11.53 | |
| EG(STI) | 1/2 | - 20 | UNF | 13.172 | 12.975 | 13.10 | 13.12 | |
| EG(STI) | 5/8 | - 18 | UNF | 16.385 | 16.180 | 16.30 | 16.33 | |
| EG(STI) | 3/4 | - 16 | UNF | 19.608 | 19.393 | 19.50 | 19.55 |
info EG(STI) 5/8 - 11 UNC 16.672 16.376 16.50 16.60