Archive for March, 2013

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Standard NPT Tap Drill Sizes Chart

StandardNPTTapDrillSizesChart.pdf

Standard NPT Tap Drill Sizes

NPT Size Tap Drill Size (in.) Decimal Equivalent (in.)
1/16 – 27 “C” 0.242
1/8 – 27 “Q” 0.332
1/4 – 18 7/16 0.438
3/8 – 18 9/16 0.562
1/2 – 14 45/64 0.703
3/4 – 14 29/32 0.906
1.0 – 11 – 1/2 1-9/64 1.141
1 – 1/4 – 11 – 1/2 1-31/64 1.484
1 – 1/2 – 11 – 1/2 1-23/32 1.719
2.0 – 11 – 1/2 2-3/16 2.188
2 – 1/2 – 8 2-39/64 2.609
3.0 – 8 3-15/64 3.234

Stand Metric Threads Tap Drills Chart

StandMetricThreadsTapDrillsChart.pdf

American Standard & ISO Metric Thread Sizes & Tap Drills

* Indicates Size of drill to be used before tapping
American Standard Thread ISO Metric Thread
Thread Size Tap Drill Size           (in.) Thread Size Tap Drill Size (mm)
0-80 3/64 M1 x 0.25 0.75
1-64 #53 M1.1 x 0.25 0.85
1-72 #53 M1.2 x 0.25 0.95
2-56 #51 M1.4 x 0.3 1.10
2-64 #50 M1.6 x 0.35 1.25
3-48 5/64 M1.8 x 0.35 1.45
3-56 #46 M2 x 0.4 1.60
4-40 #43 M2.2 x 0.45 1.75
4-48 #42 M2.5 x 0.45 2.05
5-40 #39 M3 x 0.5 2.50
5-44 #37 M3.5 x 0.6 2.90
6-32 #36 M4 x 0.7 3.30
6-40 #33 M4.5 x 0.75 3.70
8-32 #29 M5 x 0.8 4.20
8-36 #29 M6 x 1 5.00
10-24 #25 M7 x 1 6.00
10-32 #21 M8 x 1.25 6.80
12-24 #17 M9 x 1.25 7.80
12-28 #15 M10 x 1.5 8.50
1/4-20 #7 M11 x 1.5 9.50
1/4-28 #3 M12 x 1.75 10.20
5/16-18 F M14 x 2 12.00
5/16-24 I M16 x 2 14.00
3/8-16 5/16 M18 x 2.5 15.50
3/8-24 Q M20 x 2.5 17.50
7//16-14 U M22 x 2.5 19.50
7/16-20 W M24 x 3 21.00
1/2-13 27/64 M27 x 3 24.00
1/2-20 29/64 M30 x 3.5 26.50
9/16-12 31/64 M33 x 3.5 29.50
9/16-18 33/64 M36 x 4 32.00
5/8-11 17/32 M39 x 4 35.00
5/8-18 37/64 M42 x 4.5 37.50
3/4-10 21/32 M45 x 4.5 40.50
3/4-16 11/16 M48 x 5 43.00
7/8-9 49/64 M52 x 5 47.00
7/8-14 13/16 M56 x 5.5 50.50
1″ – 8 7/8 M60 x 5.5 54.50
1″ -14 15/16 M64 x 6 58.00
M68 x 6 62.00

Coarse Metric Thread Sizes Chart

CoarseMetricThreadSizesChart.pdf

Coarse Metric Thread Sizes

Thread Size Tap Drill             (mm) Thread Size Tap Drill   (mm)
M1 x 0.25 0.75 M12 x 1.75 10.20
M1.1 x 0.25 0.85 M14 x 2 12.00
M1.2 x 0.25 0.95 M16 x 2 14.00
M1.4 x 0.3 1.10 M18 x 2.5 15.50
M1.6 x 0.35 1.25 M20 x 2.5 17.50
M1.8 x 0.35 1.45 M22 x 2.5 19.50
M2 x 0.4 1.60 M24 x 3 21.00
M2.2 x 0.45 1.75 M27 x 3 24.00
M2.5 x 0.45 2.05 M30 x 3.5 26.50
M3 x 0.5 2.50 M33 x 3.5 29.50
M3.5 x 0.6 2.90 M36 x 4 32.00
M4 x 0.7 3.30 M39 x 4 35.00
M4.5 x 0.75 3.70 M42 x 4.5 37.50
M5 x 0.8 4.20 M45 x 4.5 40.50
M6 x 1 5.00 M48 x 5 43.00
M7 x 1 6.00 M52 x 5 47.00
M8 x 1.25 6.80 M56 x 5.5 50.50
M9 x 1.25 7.80 M60 x 5.5 54.50
M10 x 1.5 8.50 M64 x 6 58.00
M11 x 1.5 9.50 M68 x 6 62.00
M4 x 0.35 3.60 M16 x 1 15.0
M4 x 0.5 3.50 M16 x 1.5 15.0
M5 x 0.5 4.50 M18 x 1 17.0
M6 x .5 5.50 M18 x 2 16.0
M6 x .75 5.25 M20 x 1 19.0
M7 x .75 6.25 M20 x 1.5 18.5
M8 x .5 7.00 M20 x 2 18.0
M8 x .75 7.25 M22 x 1 21.0
M8 x 1 7.50 M22 x 1.5 20.5
M9 x 1 8.00 M22 x 2 20.0
M10 x 0.75 9.25 M24 X 1.5 22.5
M10 x 1 9.0 M24 x 2 22.0
M10 x 1.25 8.8 M26 x 1.5 24.5
M11 x 1 10.0 M27 x 1.5 25.5
M12 x .75 11.25 M27 x 2 25.0
M12 x 1 11.0 M28 x 1.5 26.5
M12 x 1.5 10.5 M30 x 1.5 28.5
M14 x 1 13.0 M30 x 2 28.0
M14 x 1.25 12.8 M33 x 2 31.0
M14 x 1.5 12.5 M36 x 3 36.0