Imperial to metric conversion table
by Annette Flottwell
Ever been searching for imperial sockets and spanners all over the place?
Didn't find them because you don't happen to live on the continent or have trouble buying them even in Dublin ? (had no luck there in 23 tool shops)
How to read this table: All sizes I came across so far in my Series III are bold. Not listed is the dreaded 2" which can easily be replaced by 51 mms. Sizes that can safely be replaced are BLUE, RED are those that will fit without major problems. Thanks to Julie and the farming machinery shop 100 yds from her place I've got nearly all the sockets now.
If
you don't believe that you need all these funny sizes, be assured that
you need half of them already for regular maintenance. It can be very
annoying and quite expensive to round off a bolt head so buy the right
tool...
Note: Don't use 12 star sockets (these should
be avoided anyhow) to replace any of the red sizes.
These red sizes are only meant for spanners and hexagonal sockets
how many/32"
1/4"
1/8"
1/16"
1/32"
in mm
will fit mm
2/32
3 etc...
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
One inch
33
34
35
36
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1
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2
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3
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4
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1
.
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3
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5
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7
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9
1
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3
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5
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7
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9
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11
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13
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15
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17
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3
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5
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7
.
9
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11
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13
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15
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17
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19
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21
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23
.
25
.
27
.
29
.
31
.
33
.
35
.
1.5875
2.38125
3.175
3.96875
4.7625
5.55625
6.35
7.14375
7.9375
8.73125
9.525
10.31875
11.1125
11.90625
12.7
13.49375
14.2875
15.08125
15.875
16.66875
17.4625
18.25625
19.05
19.84375
20.6375
21.43125
22.225
23.01875
23.8125
24.60625
25.4
26.19375
26.9875
27.78125
28.575
1.6
2.4
3.2
4
4.8
5.6
6.4
7.1
8
8.7
9.5
10.3
11.1
12
12.7
13.5
14.3
15
16
16.7
17.5
18.3
19
19.8
20.6
21.4
22.2
23
24
24.6
25.4
26.2
27
27.8
29
Have fun and work safely!