(mm)
#10-32 1/4-28 5/16-24 3/8-24 7/16-20 1/2-20 9/16-18 5/8-18
45      
3/8-24 ~ 45
       
1/4
(6.4mm)

#10-32 ~ 1/4
 
5/16-24 ~ 1/4
         
5/16
(7.9mm)

#10-32 ~ 5/16
             
3/8
(9.5mm)

#10-32 ~ 3/8

1/4-28 ~ 3/8

5/16-24 ~ 3/8

3/8-24 ~ 3/8

7/16-20 ~ 3/8
     
1/2
(12.7mm)

#10-32 ~ 1/2

1/4-28 ~ 1/2

5/16-24 ~ 1/2

3/8-24 ~ 1/2

7/16-20 ~ 1/2
     
9/16
(14.3mm)

#10-32 ~ 9/16
             
5/8
(15.9mm)

#10-32 ~ 5/8

1/4-28 ~ 5/8

5/16-24 ~ 5/8

3/8-24 ~ 5/8

7/16-20 ~ 5/8

1/2-20 ~ 5/8
   
3/4
(19.1mm)

#10-32 ~ 3/4

1/4-28 ~ 3/4

5/16-24 ~ 3/4

3/8-24 ~ 3/4

7/16-20 ~ 3/4

1/2-20 ~ 3/4

9/16-18 ~ 3/4

5/8-18 ~ 3/4
7/8
(22.2mm)

#10-32 ~ 7/8

1/4-28 ~ 7/8

5/16-24 ~ 7/8

3/8-24 ~ 7/8

7/16-20 ~ 7/8
     
1h
(25.4mm)

#10-32 ~ 1h

1/4-28 ~ 1h

5/16-24 ~ 1h

3/8-24 ~ 1h

7/16-20 ~ 1h

1/2-20 ~ 1h

9/16-18 ~ 1h

5/8-18 ~ 1h
1h1/8
(28.6mm)
     
3/8-24 ~ 1h1/8
       
1h1/4
(31.8mm)

#10-32 ~ 1h1/4

1/4-28 ~ 1h1/4

5/16-24 ~ 1h1/4

3/8-24 ~ 1h1/4

7/16-20 ~ 1h1/4

1/2-20 ~ 1h1/4

9/16-18 ~ 1h1/4

5/8-18 ~ 1h1/4
1h3/8
(34.9mm)
 
1/4-28 ~ 1h3/8
 
3/8-24 ~ 1h3/8
       
1h1/2
(38.1mm)

#10-32 ~ 1h1/2

1/4-28 ~ 1h1/2

5/16-24 ~ 1h1/2

3/8-24 ~ 1h1/2

7/16-20 ~ 1h1/2

1/2-20 ~ 1h1/2
 
5/8-18 ~ 1h1/2
1h3/4
(44.5mm)

#10-32 ~ 1h3/4

1/4-28 ~ 1h3/4

5/16-24 ~ 1h3/4

3/8-24 ~ 1h3/4
 
1/2-20 ~ 1h3/4
   
2h
(50.8mm)

#10-32 ~ 2h

1/4-28 ~ 2h

5/16-24 ~ 2h

3/8-24 ~ 2h

7/16-20 ~ 2h

1/2-20 ~ 2h

9/16-18 ~ 2h

5/8-18 ~ 2h
2h1/4
(57.2mm)
 
1/4-28 ~ 2h1/4

5/16-24 ~ 2h1/4

3/8-24 ~ 2h1/4
 
1/2-20 ~ 2h1/4
   
2h1/2
(63.5mm)

#10-32 ~ 2h1/2

1/4-28 ~ 2h1/2

5/16-24 ~ 2h1/2

3/8-24 ~ 2h1/2

7/16-20 ~ 2h1/2

1/2-20 ~ 2h1/2

9/16-18 ~ 2h1/2

5/8-18 ~ 2h1/2
2h3/4
(69.9mm)
     
3/8-24 ~ 2h3/4
 
1/2-20 ~ 2h3/4
   
3h
(76.2mm)

#10-32 ~ 3h

1/4-28 ~ 3h

5/16-24 ~ 3h

3/8-24 ~ 3h

7/16-20 ~ 3h

1/2-20 ~ 3h

9/16-18 ~ 3h

5/8-18 ~ 3h
3h1/4
(82.6mm)
     
3/8-24 ~ 3h1/4
       
3h1/2
(88.9mm)
 
1/4-28 ~ 3h1/2

5/16-24 ~ 3h1/2

3/8-24 ~ 3h1/2

7/16-20 ~ 3h1/2

1/2-20 ~ 3h1/2
 
5/8-18 ~ 3h1/2
4h
(101.6mm)
 
1/4-28 ~ 4h

5/16-24 ~ 4h

3/8-24 ~ 4h

7/16-20 ~ 4h

1/2-20 ~ 4h
 
5/8-18 ~ 4h
4h1/2
(114.3mm)
   
5/16-24 ~ 4h1/2

3/8-24 ~ 4h1/2
 
1/2-20 ~ 4h1/2
   
5h
(127mm)
 
1/4-28 ~ 5h

5/16-24 ~ 5h
 
7/16-20 ~ 5h

1/2-20 ~ 5h
 
5/8-18 ~ 5h
5h1/2
(139.7mm)
   
5/16-24 ~ 5h1/2
   
1/2-20 ~ 5h1/2
   
6h
(152.4mm)
     
3/8-24 ~ 6h