Page 720 - Yamawa_European_Catalogue_YEU21

24. Drill size and recommended hole size for cutting taps

Intro

Metric Fine Threads (MF) Unit: mm Miniature threads (S) Unit: mm
SP
Minor Diameter
Size Drill Recommended Size Recommended
Size Hole Size Hole Size
Max. Min.
MF 76 × 2 74.210 73.835 74.00 74.10 S 0.4 X 0.1 0.32
SL MF 76 × 1.5 74.676 74.376 74.50 74.60 S 0.5 X 0.125 0.41
MF 78 × 2 76.210 75.835 76.00 76.10 S 0.6 X 0.15 0.49
MF 80 × 4 76.270 75.670 76.00 76.10 S 0.7 X 0.175 0.57
MF 80 × 3 77.252 76.752 77.00 77.10 S 0.8 X 0.2 0.65
PO MF 80 × 2 78.210 77.835 78.00 78.10 S 0.9 X 0.225 0.73
MF 80 × 1.5 78.676 78.376 78.50 78.60
MF 82 × 2 80.210 79.835 80.00 80.10
MF 85 × 4 81.270 80.670 81.00 81.10
MF 85 × 3 82.252 81.752 82.00 82.10
ST
MF 85 × 2 83.210 82.835 83.00 83.10
MF 90 × 4 86.270 85.670 86.00 86.10
MF 90 × 3 87.252 86.752 87.00 87.10
MF 90 × 2 88.210 87.835 88.00 88.10
ROLL MF 95 × 4 91.270 90.670 91.00 91.10
MF 95 × 3 92.252 91.752 92.00 92.10
MF 95 × 2 93.210 92.835 93.00 93.10
MF 100 × 4 96.270 95.670 96.00 96.10
CARBIDE MF 100 × 3 97.252 96.752 97.00 97.10
MF 100 × 2 98.210 97.835 98.00 98.10

LONG
Unified Coarse Threads (UNC) Unit: mm Unified Fine Threads (UNF) Unit: mm

Minor Diameter Drill Recommended Minor Diameter Drill Recommended
Size Size Hole Size Size Size Hole Size
HAND Max. Min. Max. Min.
TAPS No. 1 - 64 UNC 1.582 1.425 1.55 1.54 No. 0 - 80 UNF 1.305 1.182 1.25 1.27
No. 2 - 56 UNC 1.871 1.695 1.80 1.83 No. 1 - 72 UNF 1.612 1.474 1.55 1.58
No. 3 - 48 UNC 2.146 1.941 2.10 2.09 No. 2 - 64 UNF 1.912 1.756 1.85 1.87
No. 4 - 40 UNC 2.385 2.157 2.30 2.33 No. 3 - 56 UNF 2.197 2.025 2.10 2.15
EG (STI)
No. 5 - 40 UNC 2.697 2.487 2.60 2.64 No. 4 - 48 UNF 2.458 2.271 2.40 2.41
No. 6 - 32 UNC 2.895 2.642 2.80 2.83 No. 5 - 44 UNF 2.740 2.551 2.70 2.69
No. 8 - 32 UNC 3.530 3.302 3.40 3.47 No. 6 - 40 UNF 3.022 2.820 2.90 2.97
SPECIAL No. 10 - 24 UNC 3.962 3.683 3.90 3.89 No. 8 - 36 UNF 3.606 3.404 3.50 3.55
THREADS, No. 12 - 24 UNC 4.597 4.344 4.50 4.53 No. 10 - 32 UNF 4.165 3.963 4.10 4.12
GAUGES
1/4 - 20 UNC 5.257 4.979 5.10 5.19 No. 12 - 28 UNF 4.724 4.496 4.60 4.67
5/16 - 18 UNC 6.731 6.401 6.60 6.65 1/4 - 28 UNF 5.588 5.360 5.50 5.53
THREAD 3/8 - 16 UNC 8.153 7.798 8.00 8.07 5/16 - 24 UNF 7.035 6.782 6.90 6.97
7/16 - 14 UNC 9.550 9.144 9.40 9.45 3/8 - 24 UNF 8.636 8.382 8.50 8.57
MILLS
1/2 - 13 UNC 11.023 10.592 10.90 10.91 7/16 - 20 UNF 10.033 9.729 9.90 9.96
9/16 - 12 UNC 12.446 11.989 12.20 12.33 1/2 - 20 UNF 11.607 11.329 11.50 11.54
5/8 - 11 UNC 13.868 13.386 13.60 13.75 9/16 - 18 UNF 13.081 12.751 12.90 13.00
DIES 3/4 - 10 UNC 16.840 16.307 16.60 16.7 5/8 - 18 UNF 14.681 14.351 14.50 14.6
7/8 - 9 UNC 19.761 19.177 19.60 19.61 3/4 - 16 UNF 17.678 17.323 17.50 17.59
1 - 8 UNC 22.606 21.971 22.30 22.45 7/8 - 14 UNF 20.675 20.270 20.50 20.57
1 1/8 - 7 UNC 25.349 24.638 25.00 25.17 1 - 12 UNF 23.571 23.114 23.30 23.46
CENTER 1“1/4 - 7 UNC 28.524 27.813 28.20 28.35 1“1/8 - 12 UNF 26.746 26.289 26.50 26.63
DRILLS 1“3/8 - 6 UNC 31.115 30.353 30.80 30.92 1“1/4 - 12 UNF 29.921 29.464 29.60 29.81
1“1/2 - 6 UNC 34.290 33.528 34.00 34.10 1“3/8 - 12 UNF 33.096 32.639 32.80 32.98
1“3/4 - 5 UNC 39.827 38.964 39.50 39.61 1“1/2 - 12 UNF 36.271 35.814 36.00 36.16
Technical 2 - 4.5 UNC 45.593 44.679 45.20 45.37
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