Tap and Drill Bit Chart
CONTENTS

Builders
Building
Carburators
Definitions
Design
Engines
Flying Tips
Fuel
Math Formulas
Picture Gallery
Projects
Propellers
Radio Systems
Reviews
Simulators
Soldering
Specifications
Theory
Conversion Tables
Trimming Your Plane

INCH SIZES 

NATIONAL COARSE

INCH SIZES

NATIONAL FINE

 FORUM CONTENTS 

TAP SIZE         
    DRILL  SIZE 
TAP           
SIZE          
  DRILL SIZE
#1-64           #51  
#0-80         
 3/64" 
#2-56          #53  
#1-72        
 #53
#3-48       5/64"  
#2-64         
 #50
#4-40         #43  
#3-56         
 #46
#5-40        #39  
#4-48         
 #42
#6-32         #36  
#5-44         
#37
#8-32          #29  
#6-40         
#33 
#10-24        
#25 
#8-36         
 #29
#12-24         #17  
#10-32        
 #21 
1/4-20        
 #7  
#12-28        
 #15
5/16-18         F  
1/4-28        
 #3
3/8-16         5/16  
5/16-24       
 I
7/16-14        U  
3/8-24        
 Q 
1/2-13       
 27/64  
7/16-20       
 W
9/16-12        31/64  
1/2-20        
 29/64
5/8-11        17/32  
9/16-18       
33/64
3/4-10         21/32  
5/8-18        
 37/64 
7/8-9         
 49/64  
3/4-16        
 11/16
1"-8            7/8  
7/8-14       
 13/16 
1-1/8-7      
 63/64  
1"-14         
15/16
1-1/4-7         1-7/64  
1-1/8-12      
 1-3/64 
1-1/2-6       
 1-11/32  
1-1/4-12      
 1-11/64 
1-3/4-5       
 1-35/64  
1-1/2-12      
 1-27/64 
2"-4-1/2      
 1-25/32 
1-3/4-12      
 1-43/64
    
2"-12         
 1-59/64

TAPER PIPE SIZES

NPT

STRAIGHT PIPE SIZES

NPS

 
TAP SIZE         
   DRILL  SIZE 
TAP SIZE         
  DRILL  SIZE 
1/8-27        
  R 
1/8-27        
S 
1/4-18        
7/16 
1/4-18        
29/64 
3/8-18        
  37/64 
3/8-18        
19/32 
1/2-14       
   23/32 
1/2-14        
47/64 
3/4-14        
59/64 
3/4-14        
15/16 
1"-11-1/2     
1-5/32 
1"-11-1/2     
1-3/16 
1-1/4-11-1/2  
1-1/2 
1-1/4-11-1/2  
1-33/64 
1-1/2-11-1/2  
1-47/64 
1-1/2-11-1/2  
1-3/4 
2"-11-1/2     
2-7/32 
2"-11-1/2     
2-7/32 
2-1/2-8       
2-5/8 
2-1/2-8       
2-21/32 
3"-8          
3-1/4 
3"-8          
3-9/32 
3-1/2-8
 3-3/4 
3-1/2-8
 3-25/32
4"-8 4-1/4 4"-8 4-9/32
METRIC COARSE SIZES METRIC FINE SIZES 
TAP              
SIZE            
DRILL SIZE 
TAP              
SIZE            
DRILL SIZE 
1mm x .25
  .75mm 
4 mm x .35
  3.6mm 
1.1 x .25
 .85 
4 x .5          
3.5 
1.2 x .25
 .95 
5 x .5
 4.5 
1.4 x .3
 1.1 
6 x .5
 5.5 
1.6 x .35        
1.25 
6 x .75         
5.25 
1.7 x .35        
1.3 
7 x .75         
6.25 
1.8 x .35        
1.45 
8 x .5          
7 
2 x .4
 1.6 
8 x .75
 7.25 
2.2 x .45
 1.75 
8 x 1
 7.5 
2.5 x .45
 2.05 
9 x 1
 8 
3 x .5
 2.5 
10 x .75
 9.25 
3.5 x .6
 2.9 
10 x 1
 9 
4 x .7
 3.3 
10 x 1.25
 8.8 
4.5 x .75
 3.7 
11 x 1
 10 
5 x .8
 4.2 
12 x .75
 11.25 
6 x 1
 5 
12 x 1
 11 
7 x 1
 6 
12 x 1.5
 10.5 
8 x 1.25
 6.8 
14 x 1
 13 
9 x 1.25
 7.8 
14 x 1.25
 12.8 
10 x 1.5
 8.5 
14 x 1.5
 12.5 
11 x 1.5
 9.5 
14.518 x 1
 15 
12 x 1.75
 10.2 16 x 1             
14 x 2
 12 
16 x 1.5
 17 
16 x 2
 14 
18 x 2
 16 
18 x 2.5
 15.5 
20 x 1
 19 
20 x 2.5
 17.5 
20 x 1.5
 18.5 
22 x 2.5
 19.5 
20 x 2
 18 
24 x 3
 21 
22 x 1
 21 
27 x 3
 24 
22 x 1.5
 20.5 
30 x 3.5
 26.5 
22 x 2
 20 
33 x 3.5
 29.5 
24 x 1.5
 22.5 
36 x 4
 32 
24 x 2
 22 
39 x 4
 35 
26 x 1.5
 24.5
    
27 x 1.5
 25.5
    
27 x 2
 25
    
28 x 1.5
 26.5
    
30 x 1.5
 28.5
    
30 x 2
 28
    
33 x 2
 31
    36 x 3