|
STANDARD WRENCH SIZING CHART
|
Nominal Opening of Proto Wrenches
or Sockets in Inches to Fit Standard Bolt Heads and Screw Heads
|
|
WRENCH OR
SOCKET SIZE
|
SQUARE AND HEX BOLTS, CAP SCREWS
& SQUARE & HEX LAG SCREWS
|
HEAVY HEX BOLTS & SCREWS
|
HEX FLANGE SCREWS
|
TAPPING SCREWS
|
HEX WASHER HEAD TAPPING SCREWS
|
HEX HEAD MACHINE SCREWS
|
HEX WASHER HEAD MACHINE SCREWS
|
SQUARE HEAD SET SCREWS
|
|
ACROSS FLATS
|
DECIMAL EQUIV.
|
|
1/8
|
0.1250
|
—
|
—
|
—
|
#1&2
|
#2&3
|
#1&2
|
#2&3
|
—
|
|
5/32
|
0.1562
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
|
3/16
|
0.1875
|
—
|
—
|
—
|
#3,4,5
|
#4&5
|
#3,4,5
|
#4&5
|
#10
|
|
1/4
|
0.2500
|
—
|
—
|
—
|
#6,7,8
|
#6,7,8
|
#6&8
|
#6&8
|
1/4
|
|
9/32
|
0.2812
|
#10
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
|
5/16
|
0.3125
|
—
|
—
|
—
|
#10&12
|
#10&12
|
#10&12
|
#10&12
|
5/16
|
|
11/32
|
0.3438
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
|
3/8
|
0.3750
|
1/4
|
—
|
1/4
|
1/4
|
1/4
|
1/4
|
1/4
|
3/8
|
|
7/16
|
0.4375
|
1/4
|
—
|
—
|
—
|
—
|
—
|
—
|
7/16
|
|
1/2
|
0.5000
|
5/16
|
—
|
5/16
|
5/16
|
5/16
|
5/16
|
5/16
|
1/2
|
|
9/16
|
0.5625
|
3/8
|
—
|
3/8
|
3/8
|
3/8
|
3/8
|
3/8
|
9/16
|
|
5/8
|
0.6250
|
7/16
|
—
|
7/16
|
—
|
—
|
—
|
—
|
5/8
|
|
11/16
|
0.6875
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
|
3/4
|
0.7500
|
1/2
|
—
|
1/2
|
—
|
—
|
—
|
—
|
3/4
|
|
13/16
|
0.8125
|
9/16
|
—
|
9/16
|
—
|
—
|
—
|
—
|
—
|
|
7/8
|
0.8750
|
—
|
1/2
|
—
|
—
|
—
|
—
|
—
|
7/8
|
|
15/16
|
0.9375
|
5/8
|
—
|
5/8
|
—
|
—
|
—
|
—
|
—
|
|
1
|
1.0000
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
1
|
|
1 1/16
|
1.0625
|
—
|
5/8
|
—
|
—
|
—
|
—
|
—
|
—
|
|
1 1/8
|
1.1250
|
3/4
|
—
|
3/4
|
—
|
—
|
—
|
—
|
1 1/8
|
|
1 1/4
|
1.2500
|
—
|
3/4
|
—
|
—
|
—
|
—
|
—
|
1 1/4
|
|
1 5/16
|
1.3125
|
7/8
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
|
1 3/8
|
1.3750
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
1 3/8
|
|
1 7/16
|
1.4375
|
—
|
7/8
|
—
|
—
|
—
|
—
|
—
|
—
|
|
1 1/2
|
1.5000
|
1
|
—
|
—
|
—
|
—
|
—
|
—
|
1 1/2
|
|
1 5/8
|
1.6250
|
—
|
1
|
—
|
—
|
—
|
—
|
—
|
—
|
|
1 11/16
|
1.6875
|
1 1/8
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
|
1 13/16
|
1.8125
|
—
|
1 1/8
|
—
|
—
|
—
|
—
|
—
|
—
|
|
1 7/8
|
1.8750
|
1 1/4
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
|
2
|
2.0000
|
—
|
1 1/4
|
—
|
—
|
—
|
—
|
—
|
—
|
|
2 1/16
|
2.0625
|
1 3/8
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
|
2 3/16
|
2.1875
|
—
|
1 3/8
|
—
|
—
|
—
|
—
|
—
|
—
|
|
2 1/4
|
2.2500
|
1 1/2
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
|
2 3/8
|
2.3750
|
—
|
1 1/2
|
—
|
—
|
—
|
—
|
—
|
—
|
|
2 7/16
|
2.4375
|
1 5/8
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
|
2 9/16
|
2.5625
|
—
|
1 5/8
|
—
|
—
|
—
|
—
|
—
|
—
|
|
2 5/8
|
2.6250
|
1 3/4
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
|
2 3/4
|
2.7500
|
—
|
1 3/4
|
—
|
—
|
—
|
—
|
—
|
—
|
|
2 13/16
|
2.8125
|
1 7/8
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
|
2 15/16
|
2.9375
|
—
|
1 7/8
|
—
|
—
|
—
|
—
|
—
|
—
|
|
3
|
3.0000
|
2
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
|
3 1/8
|
3.1250
|
—
|
2
|
—
|
—
|
—
|
—
|
—
|
—
|
|
3 3/8
|
3.3750
|
2 1/4
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
|
3 1/2
|
3.5000
|
—
|
2 1/4
|
—
|
—
|
—
|
—
|
—
|
—
|
|
3 3/4
|
3.7500
|
2 1/2
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
|
3 7/8
|
3.8750
|
—
|
2 1/2
|
—
|
—
|
—
|
—
|
—
|
—
|
|
4 1/8
|
4.1250
|
2 3/4
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
|
4 1/4
|
4.2500
|
—
|
2 3/4
|
—
|
—
|
—
|
—
|
—
|
—
|
|
4 1/2
|
4.5000
|
3
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
|
4 5/8
|
4.6250
|
—
|
3
|
—
|
—
|
—
|
—
|
—
|
—
|
|
4 7/8
|
4.8750
|
3 1/4
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
|
5
|
5.0000
|
—
|
3 1/4
|
—
|
—
|
—
|
—
|
—
|
—
|
|
5 1/4
|
5.2500
|
3 1/2
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
|
5 3/8
|
5.3750
|
—
|
3 1/2
|
—
|
—
|
—
|
—
|
—
|
—
|
|
5 5/8
|
5.6250
|
3 3/4
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
|
5 3/4
|
5.7500
|
—
|
3 3/4
|
—
|
—
|
—
|
—
|
—
|
—
|
|
6
|
6.0000
|
4
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
|
6 1/8
|
6.1250
|
—
|
4
|
—
|
—
|
—
|
—
|
—
|
—
|
|
6 1/2
|
6.5000
|
—
|
4 1/4
|
—
|
—
|
—
|
—
|
—
|
—
|
|
6 7/8
|
6.8750
|
—
|
4 1/2
|
—
|
—
|
—
|
—
|
—
|
—
|
|
7 1/4
|
7.2500
|
—
|
4 3/4
|
—
|
—
|
—
|
—
|
—
|
—
|
|
7 5/8
|
7.6250
|
—
|
5
|
—
|
—
|
—
|
—
|
—
|
—
|
|
8
|
8.0000
|
—
|
5 1/4
|
—
|
—
|
—
|
—
|
—
|
—
|
|
8 3/8
|
8.3750
|
—
|
5 1/2
|
—
|
—
|
—
|
—
|
—
|
—
|
|
8 3/4
|
8.7500
|
—
|
5 3/4
|
—
|
—
|
—
|
—
|
—
|
—
|
|
9 1/8
|
9.1250
|
—
|
6
|
—
|
—
|
—
|
—
|
—
|
—
|
|
|
