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Tap and Drill Chart

Machine Screw
Size
Threads
Per Inch
Minor
Dia
Tap Drills Clearance Hole Drills
Alum, Brass,
& Plasitcs

75% Thread

Stainless Steel,
Steels & Iron

50% Thread

All Materials
Close Fit Free Fit
# or Dia Major
Dia
Drill
Size
Decimal
Equiv.
Drill
Size
Decimal
Equiv.
Drill
Size
Decimal
Equiv.
Drill
Size
Decimal
Equiv.
0 .0600 80 .0447 3/64 .0469 55 .0520 52 .0635 50 .0700
1 .0730 64 .0538 53 .0595 1/16 .0625 48 .0760 46 .0810
72 .0560 53 .0595 52 .0635
2 .0860 56 .0641 50 .0700 49 .0730 43 .0890 41 .0960
64 .0668 50 .0700 48 .0760
3 .0990 48 .0734 47 .0785 44 .0860 37 .1040 35 .1100
56 .0771 45 .0820 43 .0890
4 .1120 40 .0813 43 .0890 41 .0960 32 .1160 30 .1285
48 .0864 42 .0935 40 .0980
5 .125 40 .0943 38 .1015 7/64 .1094 30 .1285 29 .1360
44 .0971 37 .1040 35 .1100
6 .138 32 .0997 36 .1065 32 .1160 27 .1440 25 .1495
40 .1073 33 .1130 31 .1200
8 .1640 32 .1257 29 .1360 27 .1440 18 .1695 16 .1770
36 .1299 29 .1360 26 .1470
10 .1900 24 .1389 25 .1495 20 .1610 9 .1960 7 .2010
32 .1517 21 .1590 18 .1695
12 .2160 24 .1649 16 .1770 12 .1890 2 .2210 1 .2280
28 .1722 14 .1820 10 .1935
32 .1777 13 .1850 9 .1960
1/4 .2500 20 .1887 7 .2010 7/32 .2188 F .2570 H .2660
28 .2062 3 .2130 1 .2280
32 .2117 7/32 .2188 1 .2280
5/16 .3125 18 .2443 F .2570 J .2770 P .3230 Q .3320
24 .2614 I .2720 9/32 .2812
32 .2742 9/32 .2812 L .2900
3/8 .3750 16 .2983 5/16 .3125 Q .3320 W .3860 X .3970
24 .3239 Q .3320 S .3480
32 .3367 11/32 .3438 T .3580
7/16 .4375 14 .3499 U .3680 25/64 .3906 29/64 .4531 15/32 .4687
20 .3762 25/64 .3906 13/32 .4062
28 .3937 Y .4040 Z .4130
1/2 .5000 13 .4056 27/64 .4219 29/64 .4531 33/64 .5156 17/32 .5312
20 .4387 29/64 .4531 15/32 .4688
28 .4562 15/32 .4688 15/32 .4688
9/16 .5625 12 .4603 31/64 .4844 33/64 .5156 37/64 .5781 19/32 .5938
18 .4943 33/64 .5156 17/32 .5312
24 .5114 33/64 .5156 17/32 .5312
5/8 .6250 11 .5135 17/32 .5312 9/16 .5625 41/64 .6406 21/32 .6562
18 .5568 37/64 .5781 19/32 .5938
24 .5739 37/64 .5781 19/32 .5938
11/16 .6875 24 .6364 41/64 .6406 21/32 .6562 45/64 .7031 23/32 .6562
3/4 .7500 10 .6273 21/32 .6562 11/16 .6875 49/64 .7656 25/32 .7812
16 .6733 11/16 .6875 45/64 .7031
20 .6887 45/64 .7031 23/32 .7188
13/16 .8125 20 .7512 49/64 .7656 25/32 .7812 53/64 .8281 27/32 .8438
7/8 .8750 9 .7387 49/64 .7656 51/64 .7969 57/64 .8906 29/32 .9062
14 .7874 13/16 .8125 53/64 .8281
20 .8137 53/64 .8281 27/32 .8438
15/16 .9375 20 .8762 57/64 .8906 29/32 .9062 61/64 .9531 31/32 .9688
1 1.000 8 .8466 7/8 .8750 59/64 .9219 1-1/64 1.0156 1-1/32 1.0313
12 .8978 15/16 .9375 61/64 .9531
20 .9387 61/64 .9531 31/32 .9688

METRIC THREAD - Drill & Tap Chart

Course Thread Sizes

Thread Size Tap Drill (mm) Thread Size Tap Drill (mm) Thread Size Tap Drill (mm) Thread Size Tap Drill (mm)

M1 x 0.25

0.75

M3.5 x 0.6

2.90

M12 x 1.75

10.20

M36 x 4

32.00

M1.1 x 0.25

0.85

M4 x 0.7

3.30

M14 x 2

12.00

M39 x 4

35.00

M1.2 x 0.25

0.95

M4.5 x 0.75

3.70

M16 x 2

14.00

M42 x 4.5

37.50

M1.4 x 0.3

1.10

M5 x 0.8

4.20

M18 x 2.5

15.50

M45 x 4.5

40.50

M1.6 x 0.35

1.25

M6 x 1

5.00

M20 x 2.5

17.50

M48 x 5

43.00

M1.8 x 0.35

1.45

M7 x 1

6.00

M22 x 2.5

19.50

M52 x 5

47.00

M2 x 0.4

1.60

M8 x 1.25

6.80

M24 x 3

21.00

M56 x 5.5

50.50

M2.2 x 0.45

1.75

M9 x 1.25

7.80

M27 x 3

24.00

M60 x 5.5

54.50

M2.5 x 0.45

2.05

M10 x 1.5

8.50

M30 x 3.5

26.50

M64 x 6

58.00

M3 x 0.5

2.50

M11 x 1.5

9.50

M33 x 3.5

29.50

M68 x 6

62.00

Fine Thread Sizes

Thread Size Tap Drill (mm) Thread Size Tap Drill (mm) Thread Size Tap Drill (mm) Thread Size Tap Drill (mm)

M4 x 0.35

3.60

M10 x 0.75

9.25

M16 x 1

15.0

M24 x 1.5

22.5

M4 x 0.5

3.50

M10 x 1

9.0

M16 x 1.5

15.0

M24 x 2

22.0

M5 x 0.5

4.50

M10 x 1.25

8.8

M18 x 1

17.0

M26 x 1.5

24.5

M6 x .5

5.50

M11 x 1

10.0

M18 x 2

16.0

M27 x 1.5

25.5

M6 x .75

5.25

M12 x .75

11.25

M20 x 1

19.0

M27 x 2

25.0

M7 x .75

6.25

M12 x 1

11.0

M20 x 1.5

18.5

M28 x 1.5

26.5

M8 x .5

7.00

M12 x 1.5

10.5

M20 x 2

18.0

M30 x 1.5

28.5

M8 x .75

7.25

M14 x 1

13.0

M22 x 1

21.0

M30 x 2

28.0

M8 x 1

7.50

M14 x 1.25

12.8

M22 x 1.5

20.5

M33 x 2

31.0

M9 x 1

8.00

M14 x 1.5

12.5

M22 x 2

20.0

M36 x 3

36.0

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Servicing Industry Since 1968

About Us

National Supply Source
111 Leo Ave.
Syracuse, NY 13206

Phone: (315) 463-6241
Fax: (315) 463-0316

Have a Question or Need Technical Assistance? For Personal Service Click Here to contact a NSS dealer for your state.



Alphabetical Product Index

Abrasives

Bands and Cartridge Rolls
Belt Cleaners
Belts - Portable
Belts - Stationary
Belts - Stationary - Wide
Buffing Compounds
Buffing Wheels
Cut-Off Wheels
Deburring Tools
Diamond and CBN Wheels
Diamond Hones
Diamond Tools
Discs - Bore Polishing
Discs - Bristle
Discs - Depressed Center Wheels
Discs - Fibre
Discs - Flap Discs
Discs - PSA
Discs - Quick Change
Discs - Stikit Pad Holders
Discs - Surface Conditioning
File Cleaners
File Handles
File Sets
Files
Files - Thread Restoring
Flap Wheels
Flex-Hone Honing Tools
Grinding Segments
Grinding Wheel - Adaptors
Grinding Wheel Dressers
Grinding Wheels - Bench and Pedestal
Grinding Wheels - Centerless and Cylindrical
Grinding Wheels - Deburring and Finishing
Grinding Wheels - Internal
Grinding Wheels - Other
Grinding Wheels - Plate Mounted
Grinding Wheels - Pneumatic
Grinding Wheels - Snagging
Grinding Wheels - Toolroom Wheels
Lapping Compounds
Lapping Film
Laps
Mounted Wheels
Rubberized and MX Abrasives
Sheets
Shop Rolls
Stones and Abrasive Files
Surface Conditioning Belts
Surface Conditioning Pads
Wire Brushes

Cutting Tools (also see Indexable Cutting Tools)

Angle Cutters
Bandsaw Blades
Blanks
Boring Bar Sets
Boring Bars
Boring Heads
Broach Sets
Broaches
Burr Sets
Burrs
Center Reamers
Chamfering Tools
Cold Saw Blades
Combined Drill and Countersinks
Counterbore Sets
Counterbores
Countersink Sets
Countersinks
Cut-Off Blades
Die Holders
Dies - Hex Rethreading
Dies - Pipe
Dies - Round Adjustable
Dovetail Cutters
Drill Sets
Drills - APT Multi Tool
Drills - Carbide Tipped
Drills - Circuit Board
Drills - Coolant Thru
Drills - Diamond Coated
Drills - Die Drills
Drills - Drill/Mills
Drills - HSS Drill Blanks
Drills - HSS Extra Length
Drills - HSS Jobber Length
Drills - HSS Left Hand
Drills - HSS Micro
Drills - HSS Reduced Shank
Drills - HSS Screw Machine Length
Drills - HSS Step Drills
Drills - HSS Taper Length
Drills - HSS Taper Shank
Drills - Masonary
Drills - Replaceable Tip Spade Style
Drills - Solid Carbide
Drills - Spade Drills
Drills - Spot and Center
End Mill Sets - Carbide
End Mill Sets - HSS
End Mill Sets - HSS Corner Rounding
End Mills - Carbide
End Mills - Carbide Ball End
End Mills - Carbide Corner Radius
End Mills - Carbide Corner Rounding
End Mills - Carbide Diamond Coated
End Mills - Carbide Extra Length
End Mills - Carbide Metric
End Mills - Carbide Miniature
End Mills - Carbide Roughing
End Mills - Carbide Tapered
End Mills - HSS
End Mills - HSS Ball End
End Mills - HSS Chamfering Mills
End Mills - HSS Corner Rounding
End Mills - HSS Drill/Mills
End Mills - HSS Extra Length
End Mills - HSS Keyway
End Mills - HSS Large Diameter
End Mills - HSS Left Hand
End Mills - HSS Metric
End Mills - HSS Miniature
End Mills - HSS Roughing
End Mills - HSS Roughing Ball End
End Mills - HSS Roughing Extra Length
End Mills - HSS Roughing Shell Mills
End Mills - HSS Shell Mills
End Mills - HSS Tapered
Fly Cutter Sets
Fly Cutters
Hole Cutters
Hole Saw Arbors
Hole Saw Kits
Hole Saws
Hole Saws - Arbored
Hole Saws - Carbide Tipped
Hole Saws - Diamond Grit
Keyseat Cutter Sets
Keyseat Cutters
Lathe Tool Holders
Port Contour Cutters
Power Hacksaw Blades
Radius Cutters
Reamer Sets
Reamers - Adjustable Blade
Reamers - Aligning
Reamers - Bridge
Reamers - Carbide Tipped
Reamers - Chucking
Reamers - Dowel Pin
Reamers - Drill Length
Reamers - Expansion
Reamers - Hand
Reamers - Metric
Reamers - Morse Taper
Reamers - Over/Under
Reamers - Pipe
Reamers - Repairmens
Reamers - Shell Style
Reamers - Solid Carbide
Reamers - Spiral Flute
Reamers - Taper Pin
Reamers - Taper Shank
Rebar Cutters
Recessing Tools
Saw Blades - Jig and Reciprocating
Shank Type Milling Cutters
Side Milling Cutters
Slitting and Slotting Saws
Tap and Die Sets
Tap Extensions
Tap Extractors
Tap Sets
Tap Wrenches
Tapping Tools
Taps
Taps - Acme
Taps - British Standard Parallel
Taps - Combination Drill/Taps
Taps - Extended Length
Taps - Left Hand
Taps - Metric
Taps - Nut Taps
Taps - Oversize
Taps - Pipe
Taps - Pulley
Taps - Screw Thread Insert
Taps - Solid Carbide
Taps - Special Pitch
Taps - Spiral Flute
Taps - Tap and Drill Sets
Taps - Thread Forming
Thread Milling
Threading Chasers
Tool Bits - Carbide Tipped
Tool Bits - High Speed Steel
Tool Bits - Thread Relief Tools
T-Slot Cutters

Indexable Cutting Tools

Boring Bars
Carbide Blanks
Carbide Inserts - Circle Machine
Carbide Inserts - Dijet
Carbide Inserts - Ingersoll Cutting Tools
Carbide Inserts - LMT Fette
Carbide Inserts - Other
Carbide Inserts - SP3 Diamond Film Coated
Carbide Inserts - Toshiba Tungaloy
Carbide Inserts - XACT
CBN Inserts - Toshiba Tungaloy
Ceramic Inserts - XACT
Countersinks and Chamfering Tools-Indexable
Drills-Indexable
End Mills-Indexable
Fly Cutters-Indexable
Grooving, Threading and Cut-Off
Indexable Replacement Parts - Apt
Indexable Replacement Parts - Circle Machine
Indexable Replacement Parts - Ingersoll
Indexable Replacement Parts - LMT-Fette
Indexable Replacement Parts - Toshiba Tungaloy
Indexable Replacement Parts - XACT
Milling Systems-Indexable
Port Contour Cutters-Indexable
Turning Tools

Fasteners, Metals and Plastics

Alloy Steel - Alloy 4130
Alloy Steel - Alloy 4140
Alloy Steel - Alloy 8620
Aluminum - Grade 1100
Aluminum - Grade 2011
Aluminum - Grade 2017
Aluminum - Grade 2024
Aluminum - Grade 3003
Aluminum - Grade 5052
Aluminum - Grade 6061
Aluminum - Grade 6063
Aluminum - Grade 7075
Aluminum - Tool & Jig Plate
Balls
Brass - Alloy 260
Brass - Alloy 330
Brass - Alloy 353
Brass - Alloy 360 Free Machining
Brass - Alloy 464 Unleaded Naval
Brass - Miniature Brass Shapes
Bronze - Grade 316 Commercial Grade Bronze
Bronze - Grade 510 Phosphur Bronze
Bronze - Grade 544 Leaded Bronze
Bronze - Grade 642 Non-Magnetic Bronze
Bronze - Grade 655 Silicone Bronze
Bronze - Grade 863 Manganese Bronze
Bronze - Grade 8932 Lead Free Bronze
Bronze - Grade 936 Anti-Seize Bronze
Bronze - Grade 955 Nickel Aluminum Bronze
Bronze - Grade CDA 954 Bronze
Bronze - Grade SAE 660 Bronze
Bronze - Oil Impregnated Bronze
Cable Ties
Cast Iron - Class 40
Cast Sections
Cold Rolled Steel - C1018
Cold Rolled Steel - C12L14
Cold Rolled Steel Sheets
Copper - Alloy 110
Copper - Alloy 122 Tubing
Copper - Alloy 172 Non-Sparking Copper
Copper - Alloy 1751 High Conductivity Copper
Copper - Alloy 182 High Strength Copper
Drill Rod - A-2
Drill Rod - D-2
Drill Rod - H-13
Drill Rod - H-13 Prehardened
Drill Rod - M-2
Drill Rod - Metric
Drill Rod - O-1
Drill Rod - S-7
Drill Rod - W-1
Expanded Metal - Aluminum
Expanded Metal - Stainless Steel
Expanded Metal - Steel
Facsimile Compound
Feeler Gage
Feeler Gage - 12 Inch Strips
Feeler Gage - 25 Foot Coils
Feeler Gage Assortments