Conversion Chart
Conversion Chart Showing Millimeter Sizes, Fractional and Decimal Inch Sizes
360
Milli-
Dec. Frac Meter Equiv. tional
Milli-
Dec. Frac Meter Equiv. tional
Milli-
Dec. Frac Meter Equiv. tional
Milli-
Dec. Frac Meter Equiv. tional
.1
.15
.2
.25
.3
....
.35
....
.39
.4
....
.45
....
.5
....
....
.55
....
.6
....
....
.65
....
....
.7
....
.75
....
.79
.8
....
....
.85
....
.0
....
....
.95
....
....
1.0
....
....
1.05
....
....
.0039
.0059
.0079
.0098
.0118
.0135
.0138
.0145
.0156
.0157
.0160
.0177
.0180
.0197
.0200
.0210
.0217
.0225
.0236
.0240
.0250
.0256
.0260
.0280
.0276
.0292
.0295
.0310
.0312
.0315
.0320
.0330
.0335
.0350
.0354
.0360
.0370
.0374
.0380
.0390
.0394
.0400
.0410
.0413
.0420
.0430
1/64"
1/32"
www.wrighttool.com
1.1
1.15
....
1.19
1.2
1.25
1.3
....
1.35
....
1.4
1.45
1.5
....
1.55
1.59
1.6
....
1.65
1.7
....
1.75
....
1.8
1.85
....
1.9
....
1.95
1.98
....
2.0
2.05
....
....
2.1
2.15
....
2.2
2.25
....
2.3
2.35
....
2.38
2.4
.0433
.0452
.0465
.0469
.0472
.0492
.0512
.0520
.0531
.0550
.0551
.0570
.0591
.0595
.0610
0.625
.0629
.0635
.0649
.0669
.0670
.0689
.0700
.0709
.0728
.0730
.0748
.0760
.0767
.0781
.0785
.0787
.0807
.0810
.0820
.0827
.0846
.0860
.0866
.0885
.0890
.0905
.0925
.0935
.0937
.0945
3/64"
1/16"
5/64"
3/32"
....
2.45
....
2.5
....
....
2.6
....
2.7
....
2.75
2.78
....
2.8
....
....
2.9
....
3.0
....
3.1
3.18
3.2
3.25
....
3.3
3.4
....
3.5
....
3.57
3.6
....
3.7
....
3.75
....
3.8
....
3.9
....
3.97
....
4.0
....
....
.0960
.0964
.0980
.0984
.0995
.1015
.1024
.1040
.1063
.1065
.1082
.1094
.1100
.1102
.1110
.1130
.1141
.1160
.1181
.1200
.1220
.1250
.1260
.1279
.1285
.1299
.1338
.1360
.1378
.1405
.1406
.1417
.1440
.1457
.1470
.1476
.1495
.1496
.1520
.1535
.1540
.1562
.1570
.1575
.1590
.1610
7/64"
1/8"
9/64"
5/32"
4.1
4.2
....
4.25
4.3
...
4.37
....
4.4
....
4.5
....
4.6
....
4.7
4.75
4.76
4.8
....
4.9
....
....
5.0
....
5.1
....
5.16
....
5.1
....
5.25
5.3
....
5.4
....
5.5
5.56
5.6
....
5.7
5.75
....
5.8
5.9
....
5.95
.1614
.1654
.1660
.1673
.1693
.1695
.1719
.1730
.1732
.1770
.1771
.1800
.1811
.1820
.1850
.1870
.1875
.1890
.1910
.1929
.1935
.1960
.1968
.1990
.2008
.2010
.2031
.2040
.2047
.2055
.2067
.2086
.2090
.2126
.2130
.2165
.2187
.2205
.2210
.2244
.2263
.2280
.2283
.2323
.2340
.2344
11/64"
3/16"
13/64"
7/32"
15/64"
Conversion Chart
Conversion Chart Showing Millimeter Sizes, Fractional and Decimal Inch Sizes
Milli-
Dec. Frac Meter Equiv. tional
Milli-
Dec. Frac Meter Equiv. tional
Milli-
Dec. Frac Meter Equiv. tional
Milli-
Dec. Frac Meter Equiv. tional
6.0
....
6.1
....
6.2
6.25
6.3
6.35
6.4
6.5
....
6.6
....
6.6
....
6.7
6.75
6.75
....
6.8
6.9
....
7.0
....
7.1
....
7.14
7.2
7.25
7.3
....
7.4
....
7.5
7.54
7.6
....
7.7
7.75
7.8
7.9
7.94
8.0
....
8.1
8.2
.2362
.2380
.2401
.2420
.2441
.2460
.2480
.2500
.2520
.2559
.2570
.2598
.2570
.2598
.2610
.2638
.2656
.2657
.2660
.2677
.2716
.2720
.2756
.2770
.2795
.2811
.2812
.2835
.2854
.2874
.2900
.2913
.2950
.2953
.2968
.2992
.3020
.3031
.3051
.3071
.3110
.3125
.3150
.3160
.3189
.3228
1/4"
17/64"
9/32"
19/64"
5/16"
....
8.25
8.3
8.33
8.4
....
8.5
8.6
....
8.7
8.73
8.75
8.8
....
8.9
9.0
....
9.1
9.13
9.2
9.25
9.3
....
9.4
9.5
9.53
....
9.6
9.7
9.75
9.8
....
9.9
9.92
10.0
....
....
10.32
....
10.5
10.72
11.0
11.11
11.5
11.51
11.91
.3230
.3248
.3268
.3281
.3307
.3320
.3346
.3386
.3390
.3425
.3437
.3445
.3465
.3480
.3504
.3543
.3580
.3583
.3594
.3622
.3641
.3661
.3680
.3701
.3740
.3750
.3770
.3780
.3819
.3838
.3858
.3860
.3898
.3906
.3937
.3970
.4040
.4062
.4130
.4134
.4219
.4330
.4375
.4528
.4531
.4687
21/64"
11/32"
23/64"
3/8"
25/64"
13/32"
27/64"
7/16"
29/64"
15/32"
12.0
12.30
12.5
12.7
13.0
13.10
13.49
13.5
13.89
14.0
14.29
14.5
14.68
15.0
15.08
15.48
15.5
15.88
16.0
16.27
16.5
16.67
17.0
16.06
16.46
17.5
17.86
18.0
18.26
18.5
18.65
19.0
19.05
19.45
19.5
19.84
20.0
20.24
20.5
20.64
21.0
21.03
21.43
21.5
21.83
22.0
.4724
.4843
.4921
.5000
.5118
.5156
.5312
.5315
.5469
.5512
.5625
.5709
.5781
.5906
.5937
.6094
.6102
.6250
.6299
.6406
.6496
.6562
.6693
.6719
.6875
.6890
.7031
.7087
.7187
.7283
.7344
.7480
.7500
.7656
.7677
.7812
.7874
.7969
.8071
.8125
.8268
.8281
.8437
.8465
.8594
.8661
31/64"
1/2"
33/64"
17/32"
35/64"
9/16"
37/64"
19/32"
39/64"
22.23
22.5
22.62
23.0
23.02
23.42
23.5
23.81
24.0
24.21
24.5
24.61
25.0
25.03
25.4
.8750
.8858
.8906
.9055
.9062
.9219
.9252
.9375
.9449
.9531
.9646
.9687
.9843
.9844
1.000
7/8"
57/64"
29/32"
59/64"
15/16"
61/64"
31/32"
63/64"
1"
5/8"
41/64
21/32"
43/64"
11/16"
45/64"
23/32"
47/64"
3/4"
49/64"
25/32"
51/64"
13/16"
53/64"
27/32"
55/64"
www.wrighttool.com
361
Wright Bolt Sizing Chart
Nominal Opening Sizes of Wright Wrenches or Sockets in Inches
to Fit Standard Bolt Heads, Nuts and Screw Heads
Locate thread diameter of bolt, nut or screw in extreme left or right column. Then move across to box which has proper identification of bolt, nut or screw
at top of vertical column. The size in this particular box is the nominal opening size in inches of the Wright Tool wrenches and sockets that will fit.
Nuts
Bolts and Screws
Machine
Finished Regular Heavy Screw
Series
Series
Series
Nuts
And
Hex
Hex
And
Thread Finished
And
And
Stove
Diameter
Thick
Square Square
Bolt
of Nut
Nuts
Nuts
Nuts
Nuts
Regular
Heavy
And
Series
Finished
Hex
Series
And
Square Thread
Hex And
Square
Head Diameter
Square
Head
Lag
Set
of Bolt
Head Bolts Bolts Screws Screws or Screw
Use wrench or socket size shown below
Use wrench or socket size shown below
#0 & 1
#2 & 3
#4
#5 & 6
#8
#10
#12
1/4"
7/16"
7/16"
1/2"
5/16"
1/2"
9/16"
9/16"
3/8"
9/16"
5/8"
11/16"
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"
6-1/8"
5/32"
3/16"
1/4"
5/16"
11/32"
3/8"
7/16"
7/16"
9/16"
5/8"
5/16"
3/16"
7/32"
3/8"-7/16"*
3/8"
1/4"
1/2"
1/2"
5/16"
9/16"
9/16"
3/8"
5/8"
5/8"
7/16"
3/4"
7/8"
3/4"
1/2"
13/16"
9/16"
15/16"
1-1/16"
15/16"
5/8"
1-1/8"
1-1/4"
1-1/8"
3/4"
1-5/16"
1-7/16"
1-5/16"
7/8"
1-1/2"
1-5/8"
1-1/2"
1"
1-11/16"
1-13/16" 1-11/16"
1-1/8"
1-7/8"
2"
1-7/8"
1-1/4"
2-1/16"
2-3/16"
1-3/8"
2-1/4"
2-3/8"
1-1/2"
2-7/16"
2-9/16"
2-5/8"
2-3/4"
2-13/16"
2-15/16"
3"
3-1/8"
3-3/8"
3-1/2"
3-3/4"
3-7/8"
4-1/8"
4-1/4"
4-1/2"
4-5/8"
4-7/8"
5-1/4"
5-5/8"
6"
* Regular Square Bolts Only.
362
www.wrighttool.com
#0 & 1
#2 & 3
#4
#5 & 6
#8
#10
#12
1/4"
5/16"
3/8"
7/16"
1/2"
9/16"
5/8"
3/4"
7/8"
1"
1-1/8"
1-1/4"
1-3/8"
1-1/2"
1-5/8"
1-3/4"
1-7/8"
2"
2-1/4"
2-1/2"
2-3/4"
3"
3-1/4"
3-1/2"
3-3/4"
4"
Wright Safety Fit Table
Make Sure to Use the Right Drive
Wrench
Min. Best Wrench
Min. Best Wrench
Min. Best Wrench
Min. Best
Size OpeningDrive Size OpeningDrive Size OpeningDrive Size OpeningDrive
inch metric mm inches inch metric mm inches inch metric mm inches inch metric mm inches
4mm
3/16
5mm
7/32
6mm
1/4
7mm
9/32
5/16
8mm
11/32
9mm
3/8
10mm
11mm
7/16
12mm
1/2
13mm
14mm
9/16
15mm
19/32
5/8
16mm
21/32
17mm
4.0
4.8
5.0
5.5
6.0
6.3
7.0
7.1
7.9
8.0
8.7
9.0
9.5
10.0
11.0
11.1
12.0
12.7
13.0
14.0
14.3
15.0
15.1
15.9
16.0
16.7
17.0
1/4
1/4
1/4
1/4
1/4
1/4
1/4
1/4
1/4
1/4
1/4
1/4
1/4
1/4
3/8
3/8
3/8
3/8
3/8
3/8
11/16
18mm
19mm
3/4
25/32
20mm
13/16
21mm
22mm
7/8
23mm
29/32
15/16
24mm
31/32
25mm
1
26mm
1-1/16
27mm
28mm
1-1/8
29mm
30mm
1-3/16
31mm
1-1/4
17.5
18.0
19.0
19.1
19.8
20.0
20.6
21.0
22.0
22.2
23.0
23.0
23.8
24.0
24.6
25.0
25.4
26.0
27.0
27.0
28.0
28.6
29.0
30.0
30.2
31.0
31.8
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
3/4
3/4
3/4
3/4
3/4
3/4
32mm
33mm
1-5/16
34mm
1-3/8
35mm
36mm
1-7/16
38mm
1-1/2
1-9/16
41mm
1-5/8
42mm
1-11/16
43mm
1-3/4
46mm
1-13/16
1-7/8
1-15/16
50mm
2
52mm
2-1/16
2-1/8
54mm
32.0
33.0
33.3
34.0
34.9
35.0
36.0
36.5
38.0
38.1
39.7
41.0
41.3
42.0
42.9
43.0
44.5
46.0
46.0
47.6
49.2
50.0
50.8
52.0
52.4
54.0
54.0
3/4
3/4
3/4
3/4
3/4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
55mm
2-3/16
56mm
2-1/4
58mm
2-5/16
60mm
2-3/8
2-7/16
2-1/2
65mm
2-9/16
2-5/8
2-11/16
2-3/4
70mm
2-13/16
2-7/8
2-15/16
75mm
3
3-1/8
80mm
3-1/4
3-3/8
3-1/2
55.0
55.6
56.0
57.2
58.0
58.7
60.0
60.3
61.9
63.5
65.0
65.1
66.7
68.3
69.9
70.0
71.4
73.0
74.6
75.0
76.2
79.4
80.0
82.6
85.7
88.9
1-1/2
1-1/2
1-1/2
1-1/2
1-1/2
1-1/2
1-1/2
1-1/2
1-1/2
1-1/2
1-1/2
1-1/2
1-1/2
1-1/2
1-1/2
Use this table to select the correct size wrench for any size fastener–inch
or metric.
to, but slightly smaller than 32mm. Therefore, you can safely use a 32mm
wrench without referring to the table.
1. Measure the fastener head or nut with metric calipers.
Another way to use the table without measuring is to simply choose
a wrench and try it. If the wrench is “sloppy loose,” choose a smaller
wrench. Use the table to find the next size wrench, either inch or metric.
If the wrench doesn’t fit, then you need to select a larger wrench. Again,
use the table to see which is the next larger wrench in either the inch
or metric size.
2. Look down the MINIMUM OPENING column and find the first number
larger than your reading.
3. Look to the left of that number to find the wrench size. (The vertical
line between two sizes indicates that the range of an inch wrench
overlaps that of a metric wrench. Either size can often be used.)
This table is to help you select the correct size wrench for any fastener,
even if you do not know whether it is an inch or a metric fastener. The
closer a wrench fits a fastener, the more torque can be transmitted without
rounding the fastener corners or causing excessive wear to the wrench.
First, measure the fastener head or nut with calipers in millimeters. Then,
look down the MINIMUM OPENING column to find the first number larger
than your reading. For example, if you read 15.1, look down the table
until you come to the value 15.9; then look across the table to 5/8". The
vertical line between two sizes indicates that the range of an inch wrench
overlaps that of a metric wrench. Either size can often be used.
However, the table can also be used to find the best possible fit. A 16mm
wrench could be used, but 5/8" provides a better fit in this example. If you
read 31.8, you may either use the table or recognize that this is very close
Sometimes, a fastener is damaged or worn, so you might need to use a
slightly different size wrench. You can always use the table to come as
close as possible to the best fit. Always feel how much play there is to see
that you have made the correct choice. If it doesn’t feel right, it isn’t right.
Remember that all wrenches wear when they are used, even when they are
used carefully. Once a wrench is worn oversize, it should be discarded because
its use would be the same as putting the wrong size wrench on a fastener.
The best drive size is indicated in the column headed BEST DRIVE. The
drive indicated here provides an appropriately high level of strength in
the handle. If you use a smaller drive than what is recommended here,
you may not have a strong enough tool for high-strength applications. If
you are using soft fasteners, a smaller drive will work satisfactorily. If no
drive is listed, use your judgement for the job. Extremely high torque may
require an even larger drive size than indicated.
www.wrighttool.com
363
Ret Ring Interchange A
Ret Ring Interchange
A
Groove
Diameter
Socket
Size
364
1-1/4"
1-7/16"
1-5/8"
1-3/4"
2"
2-1/8"
2-1/4"
1-3/4"
2"
2-1/8"
2-1/4"
2-1/2"
2-5/8"
2-7/8"
3-3/8"
3-7/8"
4-3/8"
B
For Use
On
Square
Drive
Number
On Ring
Wright
3/4"
3/4"
3/4"
3/4"
3/4"
3/4"
3/4"
1"
1"
1"
1"
1"
1"
1-1/2"
1-1/2"
1-1/2"
1-1/2"
10005S
10032S
10034S
18708S
18710S
18715S
18716S
10008S
10010S
10015S
10016S
10019S
18020S
10020S
10025S
10030S
10035S
6580
6581
6582
6582A
6582C
6582B
6582D
6583
6581A
6584
6585
6586
6587
84575
84576
84577
84578
www.wrighttool.com
FTL
Armstrong
FTL10005S
FTL10032S
21-964
FTL10034S
21-965
FTL18708S
FTL18710S
FTL18715S
FTL18716S
FTL10008S
21-967
FTL10010S
22-964
FTL10015S
22-965
FTL10016S
FTL10017S
FTL10019S
FTL10020S
23-964
FTL10025S
FTL10030S
FTL10035S
ATP
ATP10005S
ATP10032S
ATP10034S
ATP18708S
ATP18710S
ATP18715S
ATP18716S
ATP10008S
ATP10010S
ATP10015S
ATP10016S
ATP10017S
ATP10019S
ATP10020S
ATP10025S
ATP10030S
ATP10035S
CP
Proto
IR
C155467
IR10005S
C155468 07500-0 IR10032S
C134690 07500-1 IR10034S
C134691
C155585
C155489
C155586
C155470 10000-3 IR10008S
C155471 10000-1 IR10010S
C155472 10000-2 IR10015S
C134692 10000-4
C155473 12500-1 IR10017S
C155474
IR10019S
C134693 15000-1 IR10020S
C134694 15000-2 IR10025S
C134695 15000-3 IR10030S
C134696 15000-4 IR10035S
Williams
6-1X
6-2X
7-1X
7-2X
7-3X
7-4X
7-5X
8-1X
8-2X
8-3X
8-4X