PROTO, Industrial Tools

Phone: 800-800-TOOL

Conversion Charts


BOLT SIZING CHART

Nominal Opening of Proto Wrenches or Sockets in Inches to Fit Standard Nuts


Locate thread diameter of nut in left column. Then move across to box which has proper identification of nut at top of vertical column. The size in this particular box is the nominal opening size in inches of the PROTO wrench and sockets that will fit.

Thread Diameter
of Nut
Finished Series and Finished Thick Nuts
Regular Series Hex and Square Nuts
Heavy Series Hex and Square Nuts
Machine Screw Nuts and Stove Bolt Nuts
 
Use wrench or socket size shown below
#0 & 1
     
5/32
#2 & 3
     
3/16
#4
     
1/4
#5 & 6
     
5/16
#8
     
11/32
#10
     
3/8
#12
     
7/16
1/4"
7/16
7/16
1/2
7/16
5/16"
1/2
9/16
9/16
9/16
3/8"
9/16
5/8
11/16
5/8
7/16"
11/16
3/4
3/4
 
1/2"
3/4
13/16
7/8
 
9/16"
7/8
7/8
15/16
 
5/8"
15/16
1
1 1/16
 
3/4"
1 1/8
1 1/8
1 1/4
 
7/8"
1 5/16
1 5/16
1 7/16
 
1"
1 1/2
1 1/2
1 5/8
 
1 1/8"
1 11/16
1 11/16
1 13/16
 
1 1/4"
1 7/8
1 7/8
2
 
1 3/8"
2 1/16
2 1/16
2 3/16
 
1 1/2"
2 1/4
2 1/4
2 3/8
 
1 5/8"
2 7/16
2 7/16
2 9/16
 
1 3/4"
2 5/8
2 5/8
2 3/4
 
1 7/8"
2 13/16
2 13/16
2 15/16
 
2"
3
3
3 1/8
 
2 1/4"
3 3/8
3 3/8
3 1/2
 
2 1/2"
3 3/4
3 3/4
3 7/8
 
2 3/4"
4 1/8
4 1/8
4 1/4
 
3"
4 1/2
4 1/2
4 5/8
 
3 1/4"
   
5
 
3 1/2"
   
5 3/8
 
3 3/4"
   
5 3/4
 
4"
   
6 1/2
 
4 1/4"
   
6 1/2
 
4 1/2"
   
6 7/8
 
4 3/4"
   
7 1/4
 
5"
   
7 5/8
 
5 1/4"
   
8
 
5 1/2"
   
8 3/8
 
5 3/4"
   
8 3/4
 
6"
   
9