Page 727 - Yamawa_European_Catalogue_YEU21

24. Drill size and recommended hole size for cutting taps

Intro

Aerospace Metric Coarse Threads (MJ) Unit: mm Aerospace Metric Fine Threads (MFJ) Unit: mm
SP
Minor Diameter Minor Diameter
Size Drill Recommended Size Drill Recommended
Size Hole Size Size Hole Size
Max. Min. Max. Min.
MJ 3 x 0.5 2.653 2.513 2.60 2.62 MJ 8 x 1 7.216 7.026 7.10 7.17
MJ 4 x 0.7 3.498 3.318 3.10 3.45 SL
MJ 5 x 0.8 4.421 4.221 4.30 4.37
MJ 6 x 1 5.216 5.026 5.10 5.17
MJ 8 x 1.25 6.994 6.782 6.90 6.94
MJ 10 x 1.5 8.775 8.539 8.65 8.72
PO
MJ 12 x 1.75 10.560 10.295 10.43 10.50
MJ 16 x 2 14.351 14.051 14.20 14.30

ST

Aerospace Unified Coarse Threads (UNJC) Unit: mm Aerospace Unified Fine Threads (UNJF) Unit: mm ROLL

Minor Diameter Drill Recommended Minor Diameter Drill Recommended
Size Size
Size Hole Size Size Hole Size
Max. Min. Max. Min.
No. 2 - 56 UNJC 1.859 1.743 1.81 1.83 No. 2 - 64 UNJF 1.902 1.799 1.86 1.88 CARBIDE
No. 3 - 48 UNJC 2.136 1.999 2.10 2.10 No. 3 - 56 UNJF 2.189 2.073 2.10 2.16
No. 4 - 40 UNJC 2.392 2.228 2.30 2.35 No. 4 - 48 UNJF 2.466 2.330 2.40 2.43
No. 5 - 40 UNJC 2.722 2.558 2.60 2.68 No. 5 - 44 UNJF 2.763 2.614 2.70 2.73
No. 6 - 32 UNJC 2.938 2.734 2.84 2.89 No. 6 - 40 UNJF 3.053 2.888 3.00 3.01
LONG
No. 8 - 32 UNJC 3.599 3.394 3.50 3.55 No. 8 - 36 UNJF 3.662 3.480 3.60 3.62
No. 10 - 24 UNJC 4.064 3.795 3.93 4.00 No. 10 - 32 UNJF 4.254 4.054 4.20 4.20
No. 12 - 24 UNJC 4.704 4.456 4.60 4.64 No. 12 - 28 UNJF 4.815 4.603 4.70 4.76
1/4 - 20 UNJC 5.387 5.114 5.30 5.32 1/4 - 28 UNJF 5.661 5.467 5.60 5.61 HAND
5/16 - 18 UNJC 6.832 6.564 6.70 6.76 5/16 - 24 UNJF 7.109 6.907 7.00 7.06 TAPS
3/8 - 16 UNJC 8.255 7.979 8.10 8.19 3/8 - 24 UNJF 8.679 8.494 8.60 8.63
7/16 - 14 UNJC 9.639 9.348 9.50 9.57 7/16 - 20 UNJF 10.083 9.876 10.00 10.03
1/2 - 13 UNJC 11.094 10.798 11.00 11.02 1/2 - 20 UNJF 11.661 11.464 11.60 11.61
9/16 - 12 UNJC 12.481 12.228 12.40 12.42 9/16 - 18 UNJF 13.121 12.914 13.00 13.07 EG (STI)
5/8 - 11 UNJC 13.903 13.628 13.80 13.83 5/8 - 18 UNJF 14.701 14.501 14.60 14.65
3/4 - 10 UNJC 16.880 16.577 16.70 16.80 3/4 - 16 UNJF 17.721 17.506 17.60 17.67
7/8 - 9 UNJC 19.814 19.477 19.70 19.73 7/8 - 14 UNJF 20.706 20.460 20.60 20.64 SPECIAL
1 - 8 UNJC 22.689 22.309 22.50 22.59 1 - 12 UNJF 23.594 23.341 23.50 23.53 THREADS,
GAUGES

Steel Conduit Threads (Pg) Unit: mm THREAD
MILLS
Minor Diameter Drill Recommended
Size
Size Hole Size
Max. Min.
Pg 7 - 20 11.43 11.28 11.40 11.45
DIES
Pg 9 - 18 14.01 13.86 14.00 14.10
Pg 11 - 18 17.41 17.26 17.30 17.35
Pg 13.5 - 18 19.21 19.06 19.10 19.15
Pg 16 - 18 21.31 21.16 21.25 21.30 CENTER
Pg 21 - 16 27.03 26.78 27.00 27.10 DRILLS
Pg 29 - 16 35.73 35.48 35.60 35.70

Technical
info

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