Page 726 - Yamawa_European_Catalogue_YEU21

24. Drill size and recommended hole size for cutting taps

Intro

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

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