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On this page we have
listed dimensions for sizes of various thread forms which may help you identify
those more awkward screws etc.
A SWG (standard wire gauge) comparison table and a Inch
to Metric conversion table are also
listed below.
Links to sections on this page
|
Sending us a sample for
identification
Many customers send
us samples to identify - we provide this service free of charge, and can almost
always source matching nuts and screws. Samples should be sent to our
correspondence address - please
click here.
Please make sure that samples are very well wrapped
- if they are sent in a plain paper envelope with
no additional packing they almost certainly will not reach us intact as the post
office sorting machinery
will push the sample through the side of the envelope.
Please note that we are regularly
sent screws from Japanese made camera lenses and camera bodies. In the majority
of cases these turn out to be specialised non standard threads unobtainable from
usual sources and so we recommend you consult a camera spares specialist for
these items.
Please also make sure you stamp your package using the appropriate postage rate,
taking note that any envelopes posted in the UK over 5mm in thickness must be
stamped at 'large letter' rate, and over 25mm thick at 'packet' rate.
If you need the sample returned, please insure you enclose a note of your
address and include stamps to the appropriate value (please do not send us a
stamped and addressed envelope - we'll provide the return envelope free of
charge). If you order items following our advice regarding your sample, the
stamp(s) will be returned to you.
Sorry but we cannot return samples sent from outside of the UK if an order isn't
subsequently placed.
Posting from within the UK
For small screw samples weighing up to 100g
(which covers most of the samples we receive) you will need to
include a first or second class large letter stamp for its return. For heavier items
please consult the Royal Mail website price guide.
You must also include an e mail address so
we can contact you.
Further information on UK postage rates are
available
here |
Some Explanation of Terms Used
These are intended to give some basic guidance to
customers that may be unfamiliar with the technical details of the many screw
thread forms available.
We could fill this page with masses of technical thread
data, but some basic definition of the terms used in the table below will
hopefully give enough guidance without putting you to sleep !
If you do require more in depth data, please do not
hesitate to
e mail us with your
questions.
Please also remember that we are happy identify samples
sent to us by post at no cost.
We now stock a range of taps and dies to match our
metric, UNC, UNF and BA fixings range (other threads also available on request) - please
click
here for details.
|
'Nom
Dia' |
This is the nominal diameter over
the thread, i.e. the approx diameter over the thread peaks. In practice if
measured very accurately, the diameter across the tips of the thread peaks
will be very slightly less than the nominal diameter |
|
'Pitch' |
The distance between the peaks of adjacent
threads. 25.4 divided by the pitch in millimetres figure will give the TPI
figure. |
|
'TPI' |
A term often stated for
'imperial' threads = Threads per Inch. 25.4
divided by the TPI figure will give the pitch dimension in millimetres.
American threads (UNC and UNF) are often quoted as the gauge size
followed by the TPI figure, for instance No 4 UNC is often quoted as
'4-40' (screw size No 4 with 40 TPI) |
|
Tap
Drill |
The diameter of the drill required to give the
correct pilot hole before tapping to the specified thread size and form.
The sizes listed below are the standard size for maximum thread
engagement. Larger sizes can be used for increased tap life but
reduced thread engagement. Our drill bits page lists alternative sizes for
65% engagement for non critical applications. |
The
information below is given in good faith, however we accept no responsibility
for any consequences of its use.
Dia and
pitch for fractional inch (Imperial) threads converted from inches to 3dp, 1" = 25.4mm
Threads per inch (TPI) = 25.4/pitch
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Metric
Coarse Pitch
60 degree thread angle |
|
Metric Fine Pitch
60 degree thread angle |
|
Size |
Nom |
Pitch |
Tap
Drill |
|
Size |
Nom |
Pitch |
Tap Drill |
|
ref |
Dia
(mm) |
(mm) |
Dia
(mm) |
|
ref |
Dia
(mm) |
(mm) |
Dia (mm) |
|
M1 |
1.0 |
0.25 |
0.75 |
|
M2 |
2.0 |
0.25 |
1.75 |
|
M1.6 |
1.6 |
0.35 |
1.25 |
|
M2 |
2.0 |
0.45* |
1.55 |
|
M2 |
2.0 |
0.4 |
1.6 |
|
M2.3 |
2.3 |
0.4 |
1.9 |
|
M2.5 |
2.5 |
0.45 |
2.05 |
|
M2.6 |
2.6 |
0.45 |
2.15 |
|
M3 |
3.0 |
0.5 |
2.5 |
|
M3 |
3.0 |
0.35 |
2.65 |
|
M3.5 |
3.5 |
0.6 |
2.9 |
|
M3 |
3.0 |
0.6* |
2.4 |
|
M4 |
4.0 |
0.7 |
3.3 |
|
M4 |
4.0 |
0.5 |
3.5 |
|
M5 |
5.0 |
0.8 |
4.2 |
|
M4 |
4.0 |
0.75* |
3.25 |
|
M6 |
6.0 |
1.0 |
5.0 |
|
M5 |
5.0 |
0.5 |
4.5 |
|
M8 |
8.0 |
1.25 |
6.8 |
|
M5 |
5.0 |
0.75 |
4.25 |
|
M10 |
10.0 |
1.5 |
8.5 |
|
M6 |
6.0 |
0.75 |
5.25 |
|
M12 |
12.0 |
1.75 |
10.2 |
|
M8 |
8.0 |
0.75 |
7.25 |
|
M16 |
16.0 |
2.0 |
14.0 |
|
M10 |
10.0 |
1.25 |
8.75 |
|
|
|
|
|
|
M12 |
12.0 |
1.5 |
10.5 |
| |
|
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| |
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Please note that
this is not an exhaustive list and other pitches are available
for some diameters.
Pitches marked with a * are actually coarser
than the metric coarse equivalent
size - this is not an error! |
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Unified
Coarse (UNC)
60 degree thread angle |
|
Unified
Fine (UNF)
60 degree thread angle |
|
Size |
Nom |
Pitch |
Tap Drill |
|
Size |
Nom |
Pitch |
Tap
Drill |
|
ref |
Dia
(mm)* |
(mm)* |
Dia (mm) |
|
ref |
Dia
(mm)* |
(mm)* |
Dia
(mm) |
| |
|
|
|
|
0-80 |
1.524 |
0.318 |
1.4 |
|
1-64 |
1.854 |
0.397 |
1.6 |
|
1-72 |
1.854 |
0.353 |
1.7 |
|
2-56 |
2.184 |
0.454 |
1.8 |
|
2-64 |
2.184 |
0.397 |
2.0 |
|
3-48 |
2.515 |
0.529 |
2.1 |
|
3-56 |
2.515 |
0.454 |
2.3 |
|
4-40 |
2.845 |
0.635 |
2.3 |
|
4-48 |
2.845 |
0.529 |
2.6 |
|
5-40 |
3.175 |
0.635 |
2.65 |
|
5-44 |
3.175 |
0.577 |
2.9 |
|
6-32 |
3.505 |
0.794 |
2.8 |
|
6-40 |
3.505 |
0.635 |
3.0 |
|
8-32 |
4.166 |
0.794 |
3.5 |
|
8-36 |
4.166 |
0.706 |
3.5 |
|
10-24 |
4.826 |
1.058 |
3.9 |
|
10-32 |
4.826 |
0.794 |
4.1 |
|
12-24 |
5.486 |
1.058 |
4.5 |
|
12-28 |
5.486 |
0.907 |
4.7 |
|
1/4-20 |
6.35 |
1.27 |
5.1 |
|
1/4-28 |
6.35 |
0.907 |
5.5 |
|
5/16-18 |
7.938 |
1.411 |
6.6 |
|
5/16-24 |
7.938 |
1.058 |
6.9 |
|
3/8-16 |
9.525 |
1.588 |
8.0 |
|
3/8-24 |
9.525 |
1.058 |
8.5 |
|
7/16-14 |
11.11 |
1.814 |
9.4 |
|
7/16-20 |
11.11 |
1.27 |
9.9 |
|
1/2-13 |
12.7 |
1.954 |
10.8 |
|
1/2-20 |
12.7 |
1.27 |
11.5 |
|
* Dia and
pitch converted from inches to 3dp, 1" = 25.4mm |
|
* Dia and
pitch converted from inches to 3dp, 1" = 25.4mm |
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British Standard Whitworth (BSW)
55 degree thread angle |
|
British Standard Fine (BSF)
55 degree thread angle |
|
Size |
Nom |
Pitch |
Tap
Drill |
|
Size |
Nom |
Pitch |
Tap
Drill |
|
ref |
Dia
(mm)* |
(mm)* |
Dia
(mm) |
|
ref |
Dia
(mm)* |
(mm)* |
Dia
(mm) |
|
1/16" |
1.588 |
0.423 |
1.2 |
|
3/16" |
4.763 |
0.794 |
4.0 |
|
3/32" |
2.381 |
0.529 |
1.9 |
|
7/32" |
5.556 |
0.907 |
4.6 |
|
1/8" |
3.175 |
0.635 |
2.55 |
|
1/4" |
6.350 |
0.977 |
5.3 |
|
5/32" |
3.969 |
0.794 |
3.2 |
|
9/32" |
7.144 |
0.977 |
6.0 |
|
3/16" |
4.763 |
1.058 |
3.7 |
|
5/16" |
7.938 |
1.155 |
6.8 |
|
7/32" |
5.556 |
1.058 |
4.5 |
|
3/8" |
9.525 |
1.27 |
8.3 |
|
1/4" |
6.350 |
1.270 |
5.1 |
|
7/16" |
11.113 |
1.411 |
9.7 |
|
9/32" |
7.144 |
1.27 |
5.8 |
|
1/2" |
12.70 |
1.588 |
11.1 |
|
5/16" |
7.938 |
1.411 |
6.5 |
|
9/16" |
14.288 |
1.588 |
12.7 |
|
3/8" |
9.525 |
1.588 |
7.9 |
|
|
|
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|
|
7/16" |
11.113 |
1.814 |
9.3 |
|
Metric Spark Plug Threads
60 degree thread angle |
|
1/2" |
12.70 |
2.117 |
10.5 |
|
Size |
Nom |
Pitch |
Tap
Drill |
|
9/16" |
14.288 |
2.117 |
12.1 |
|
ref |
Dia
(mm)* |
(mm)* |
Dia
(mm) |
For non critical applications, 1/4"UNC
can be
substituted for 1/4" BSW |
|
M10SP |
10.0 |
1.0 |
9.0 |
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M12SP |
12.0 |
1.25 |
10.75 |
British Association (BA)
47.5 degree thread angle |
|
M14SP |
14.0 |
1.25 |
12.75 |
|
Size |
Nom |
Pitch |
Tap Drill |
|
M18SP |
18.0 |
1.5 |
16.5 |
|
ref |
Dia
(mm) |
(mm) |
Dia (mm) |
|
|
|
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|
|
12 |
1.3 |
0.28 |
1.05 |
|
Metric Conduit Threads
60 degree thread angle |
|
11 |
1.5 |
0.31 |
1.2 |
|
Size |
Nom |
Pitch |
Tap
Drill |
|
10 |
1.7 |
0.35 |
1.4 |
|
ref |
Dia
(mm)* |
(mm)* |
Dia
(mm) |
|
9 |
1.9 |
0.39 |
1.55 |
|
M16C |
16.0 |
1.5 |
14.5 |
|
8 |
2.2 |
0.43 |
1.8 |
|
M20 |
20.0 |
1.5 |
18.5 |
|
7 |
2.5 |
0.48 |
2.05 |
|
M25C |
25.0 |
1.5 |
23.5 |
|
6 |
2.8 |
0.53 |
2.3 |
|
M32C |
32.0 |
1.5 |
30.5 |
|
5 |
3.2 |
0.59 |
2.64 |
|
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|
4 |
3.6 |
0.66 |
3.0 |
|
Model Engineer (ME)
(55 degree angle) |
|
3 |
4.1 |
0.73 |
3.4 |
|
Size |
Nom |
Pitch |
Tap Drill |
|
2 |
4.7 |
0.81 |
4.0 |
|
ref |
Dia
(mm) |
(mm) |
Dia (mm) |
|
1 |
5.3 |
0.9 |
4.4 |
|
1/8"-40 |
3.175 |
0.635 |
2.55 |
|
0 |
6.0 |
1.0 |
5.1 |
|
5/32"x32 |
3.969 |
0.794 |
3.2 |
|
For non critical applications, metric M6
coarse (1.0mm pitch) can be substituted for 0BA |
|
5/32"x40 |
3.969 |
0.635 |
3.3 |
|
|
|
|
|
|
3/16"x32 |
4.763 |
0.794 |
4.0 |
Cycle Threads
60 degree thread angle |
|
3/16"x40 |
4.763 |
0.635 |
4.1 |
|
Size |
Nom |
Pitch |
Tap
Drill |
|
7/32"x40 |
5.556 |
0.635 |
4.9 |
|
ref |
Dia
(mm)* |
(mm)* |
Dia
(mm) |
|
1/4"x32 |
6.35 |
0.794 |
5.5 |
|
1/8"x40 |
3.175 |
0.635 |
2.5 |
|
1/4"x40 |
6.35 |
0.635 |
5.7 |
|
5/32"x32 |
3.969 |
0.794 |
3.25 |
|
9/32"x32 |
7.144 |
0.794 |
6.35 |
|
3/16"x32 |
4.763 |
0.794 |
3.97 |
|
9/32"x40 |
7.144 |
0.635 |
6.5 |
|
1/4"x26 |
6.35 |
0.977 |
5.6 |
|
5/16"x32 |
7.938 |
0.794 |
7.15 |
|
9/32"x26 |
7.144 |
0.977 |
6.2 |
|
5/16"x40 |
7.938 |
0.635 |
7.3 |
|
5/16"x26 |
7.938 |
0.977 |
7.0 |
|
3/8"x32 |
9.525 |
0.794 |
8.75 |
|
3/8"x26 |
9.525 |
0.977 |
8.6 |
|
3/8"x40 |
9.525 |
0.635 |
8.9 |
|
7/16"x26 |
11.113 |
0.977 |
10.1 |
|
7/16"x32 |
11.113 |
0.794 |
10.3 |
|
1/2"x26 |
12.7 |
0.977 |
11.7 |
|
7/16"x40 |
11.113 |
0.635 |
10.5 |
|
9/16"x26 |
14.288 |
0.977 |
13.1 |
|
1/2"x32 |
12.7 |
0.794 |
11.9 |
|
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|
|
1/2"x40 |
12.7 |
0.635 |
12.0 |
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The
tables below show thread types listed by ascending nominal diameter (left
hand table) and ascending thread pitch (right hand table) which can be
useful for identifying an unknown thread. The tables include Metric
Coarse, Metric Fine, Unified Coarse (UNC), Unified Fine (UNF), British
Association (BA), Whitworth (BSW) and Whitworth Fine (BSF), from nominal
diamters of 1mm to 14.3mm.
|
Listed by ascending nominal diameter (1mm to
14.3mm) |
|
Listed by ascending pitch (0.25mm to 2.2mm) |
Thread
Type |
Thread
Size |
Nominal
Diameter
(mm) |
Thread
Pitch
(mm) |
Threads
per inch |
Tap Drill
Dia
(mm) |
|
Thread
Type |
Thread
Size |
Nominal
Diameter
(mm) |
Thread
Pitch
(mm) |
Threads
per inch |
Tap Drill
Dia
(mm) |
|
Metric Coarse |
M1 |
1.00 |
0.25 |
101.6 |
0.75 |
|
Metric Coarse |
M1 |
1 |
0.25 |
101.6 |
0.75 |
|
BA |
11 |
1.50 |
0.31 |
81.9 |
1.2 |
|
BA |
11 |
1.5 |
0.31 |
81.9 |
1.2 |
|
BSW |
1/16" |
1.59 |
0.423 |
60 |
1.2 |
|
Metric Coarse |
M1.6 |
1.6 |
0.35 |
72.6 |
1.25 |
|
Metric Coarse |
M1.6 |
1.60 |
0.35 |
72.6 |
1.25 |
|
BA |
10 |
1.7 |
0.35 |
72.6 |
1.4 |
|
BA |
10 |
1.70 |
0.35 |
72.6 |
1.4 |
|
Metric Fine |
M3 |
3 |
0.35 |
72.6 |
2.65 |
|
UNF |
1-72 |
1.85 |
0.353 |
72 |
1.7 |
|
UNF |
1-72 |
1.854 |
0.353 |
72 |
1.7 |
|
UNC |
1-64 |
1.85 |
0.397 |
64 |
1.6 |
|
BA |
9 |
1.9 |
0.39 |
65.1 |
1.55 |
|
BA |
9 |
1.90 |
0.39 |
65.1 |
1.55 |
|
UNC |
1-64 |
1.854 |
0.397 |
64 |
1.6 |
|
Metric Coarse |
M2 |
2.00 |
0.4 |
63.5 |
1.6 |
|
UNF |
2-64 |
2.184 |
0.397 |
64 |
2 |
|
Metric Fine |
M2 |
2.00 |
0.45 |
56.4 |
1.55 |
|
Metric Coarse |
M2 |
2 |
0.4 |
63.5 |
1.6 |
|
UNF |
2-64 |
2.18 |
0.397 |
64 |
2 |
|
Metric Fine |
M2.3 |
2.3 |
0.4 |
63.5 |
1.9 |
|
UNC |
2-56 |
2.18 |
0.454 |
56 |
1.8 |
|
BSW |
1/16" |
1.588 |
0.423 |
60 |
1.2 |
|
BA |
8 |
2.20 |
0.43 |
59.1 |
1.8 |
|
BA |
8 |
2.2 |
0.43 |
59.1 |
1.8 |
|
Metric Fine |
M2.3 |
2.30 |
0.4 |
63.5 |
1.9 |
|
Metric Fine |
M2 |
2 |
0.45 |
56.4 |
1.55 |
|
BSW |
3/32" |
2.38 |
0.529 |
48 |
1.9 |
|
Metric Coarse |
M2.5 |
2.5 |
0.45 |
56.4 |
2.05 |
|
Metric Coarse |
M2.5 |
2.50 |
0.45 |
56.4 |
2.05 |
|
Metric Fine |
M2.6 |
2.6 |
0.45 |
56.4 |
2.15 |
|
BA |
7 |
2.50 |
0.48 |
52.9 |
2.05 |
|
UNC |
2-56 |
2.184 |
0.454 |
56 |
1.8 |
|
UNF |
3-56 |
2.52 |
0.454 |
56 |
2.3 |
|
UNF |
3-56 |
2.515 |
0.454 |
56 |
2.3 |
|
UNC |
3-48 |
2.52 |
0.529 |
48 |
2.1 |
|
BA |
7 |
2.5 |
0.48 |
52.9 |
2.05 |
|
Metric Fine |
M2.6 |
2.60 |
0.45 |
56.4 |
2.15 |
|
Metric Coarse |
M3 |
3 |
0.5 |
50.8 |
2.5 |
|
BA |
6 |
2.80 |
0.53 |
47.9 |
2.3 |
|
Metric Fine |
M4 |
4 |
0.5 |
50.8 |
3.5 |
|
UNF |
4-48 |
2.85 |
0.529 |
48 |
2.6 |
|
Metric Fine |
M5 |
5 |
0.5 |
50.8 |
4.5 |
|
UNC |
4-40 |
2.85 |
0.635 |
40 |
2.3 |
|
BSW |
3/32" |
2.381 |
0.529 |
48 |
1.9 |
|
Metric Fine |
M3 |
3.00 |
0.35 |
72.6 |
2.65 |
|
UNC |
3-48 |
2.515 |
0.529 |
48 |
2.1 |
|
Metric Coarse |
M3 |
3.00 |
0.5 |
50.8 |
2.5 |
|
UNF |
4-48 |
2.845 |
0.529 |
48 |
2.6 |
|
Metric Fine |
M3 |
3.00 |
0.6 |
42.3 |
2.4 |
|
BA |
6 |
2.8 |
0.53 |
47.9 |
2.3 |
|
UNF |
5-44 |
3.18 |
0.577 |
44 |
2.9 |
|
UNF |
5-44 |
3.175 |
0.577 |
44 |
2.9 |
|
UNC |
5-40 |
3.18 |
0.635 |
40 |
2.65 |
|
BA |
5 |
3.2 |
0.59 |
43.1 |
2.64 |
|
BSW |
1/8" |
3.18 |
0.635 |
40 |
2.55 |
|
Metric Fine |
M3 |
3 |
0.6 |
42.3 |
2.4 |
|
BA |
5 |
3.20 |
0.59 |
43.1 |
2.64 |
|
Metric Coarse |
M3.5 |
3.5 |
0.6 |
42.3 |
2.9 |
|
Metric Coarse |
M3.5 |
3.50 |
0.6 |
42.3 |
2.9 |
|
UNC |
4-40 |
2.845 |
0.635 |
40 |
2.3 |
|
UNF |
6-40 |
3.51 |
0.635 |
40 |
3 |
|
UNC |
5-40 |
3.175 |
0.635 |
40 |
2.65 |
|
UNC |
6-32 |
3.51 |
0.794 |
32 |
2.8 |
|
BSW |
1/8" |
3.175 |
0.635 |
40 |
2.55 |
|
BA |
4 |
3.60 |
0.66 |
38.5 |
3 |
|
UNF |
6-40 |
3.505 |
0.635 |
40 |
3 |
|
BSW |
5/32" |
3.97 |
0.794 |
32 |
3.2 |
|
BA |
4 |
3.6 |
0.66 |
38.5 |
3 |
|
Metric Fine |
M4 |
4.00 |
0.5 |
50.8 |
3.5 |
|
Metric Coarse |
M4 |
4 |
0.7 |
36.3 |
3.3 |
|
Metric Coarse |
M4 |
4.00 |
0.7 |
36.3 |
3.3 |
|
UNF |
8-36 |
4.166 |
0.706 |
36 |
3.5 |
|
Metric Fine |
M4 |
4.00 |
0.75 |
33.9 |
3.25 |
|
BA |
3 |
4.1 |
0.73 |
34.8 |
3.4 |
|
BA |
3 |
4.10 |
0.73 |
34.8 |
3.4 |
|
Metric Fine |
M4 |
4 |
0.75 |
33.9 |
3.25 |
|
UNF |
8-36 |
4.17 |
0.706 |
36 |
3.5 |
|
Metric Fine |
M5 |
5 |
0.75 |
33.9 |
4.25 |
|
UNC |
8-32 |
4.17 |
0.794 |
32 |
3.5 |
|
Metric Fine |
M6 |
6 |
0.75 |
33.9 |
5.25 |
|
BA |
2 |
4.70 |
0.81 |
31.4 |
4 |
|
Metric Fine |
M8 |
8 |
0.75 |
33.9 |
7.25 |
|
BSF |
3/16" |
4.76 |
0.794 |
32 |
4 |
|
UNC |
6-32 |
3.505 |
0.794 |
32 |
2.8 |
|
BSW |
3/16" |
4.76 |
1.058 |
24 |
3.7 |
|
BSW |
5/32" |
3.969 |
0.794 |
32 |
3.2 |
|
UNF |
10-32 |
4.83 |
0.794 |
32 |
4.1 |
|
UNC |
8-32 |
4.166 |
0.794 |
32 |
3.5 |
|
UNC |
10-24 |
4.83 |
1.058 |
24 |
3.9 |
|
BSF |
3/16" |
4.763 |
0.794 |
32 |
4 |
|
Metric Fine |
M5 |
5.00 |
0.5 |
50.8 |
4.5 |
|
UNF |
10-32 |
4.826 |
0.794 |
32 |
4.1 |
|
Metric Fine |
M5 |
5.00 |
0.75 |
33.9 |
4.25 |
|
Metric Coarse |
M5 |
5 |
0.8 |
31.8 |
4.2 |
|
Metric Coarse |
M5 |
5.00 |
0.8 |
31.8 |
4.2 |
|
BA |
2 |
4.7 |
0.81 |
31.4 |
4 |
|
BA |
1 |
5.30 |
0.9 |
28.2 |
4.4 |
|
BA |
1 |
5.3 |
0.9 |
28.2 |
4.4 |
|
UNF |
12-28 |
5.49 |
0.907 |
28 |
4.7 |
|
UNF |
12-28 |
5.486 |
0.907 |
28 |
4.7 |
|
UNC |
12-24 |
5.49 |
1.058 |
24 |
4.5 |
|
BSF |
7/32" |
5.556 |
0.907 |
28 |
4.6 |
|
BSF |
7/32" |
5.56 |
0.907 |
28 |
4.6 |
|
UNF |
1/4-28 |
6.35 |
0.907 |
28 |
5.5 |
|
BSW |
7/32" |
5.56 |
1.058 |
24 |
4.5 |
|
BSF |
1/4" |
6.35 |
0.977 |
26 |
5.3 |
|
Metric Fine |
M6 |
6.00 |
0.75 |
33.9 |
5.25 |
|
BSF |
9/32" |
7.144 |
0.977 |
26 |
6 |
|
Metric Coarse |
M6 |
6.00 |
1 |
25.4 |
5 |
|
Metric Coarse |
M6 |
6 |
1 |
25.4 |
5 |
|
BA |
0 |
6.00 |
1 |
25.4 |
5.1 |
|
BA |
0 |
6 |
1 |
25.4 |
5.1 |
|
UNF |
1/4-28 |
6.35 |
0.907 |
28 |
5.5 |
|
BSW |
3/16" |
4.763 |
1.058 |
24 |
3.7 |
|
BSF |
1/4" |
6.35 |
0.977 |
26 |
5.3 |
|
UNC |
10-24 |
4.826 |
1.058 |
24 |
3.9 |
|
UNC |
1/4-20 |
6.35 |
1.27 |
20 |
5.1 |
|
UNC |
12-24 |
5.486 |
1.058 |
24 |
4.5 |
|
BSW |
1/4" |
6.35 |
1.27 |
20 |
5.1 |
|
BSW |
7/32" |
5.556 |
1.058 |
24 |
4.5 |
|
BSF |
9/32" |
7.14 |
0.977 |
26 |
6 |
|
UNF |
5/16-24 |
7.938 |
1.058 |
24 |
6.9 |
|
BSW |
9/32" |
7.14 |
1.27 |
20 |
5.8 |
|
UNF |
3/8-24 |
9.525 |
1.058 |
24 |
8.5 |
|
UNF |
5/16-24 |
7.94 |
1.058 |
24 |
6.9 |
|
BSF |
5/16" |
7.938 |
1.155 |
22 |
6.8 |
|
BSF |
5/16" |
7.94 |
1.155 |
22 |
6.8 |
|
Metric Coarse |
M8 |
8 |
1.25 |
20.3 |
6.8 |
|
UNC |
5/16-18 |
7.94 |
1.411 |
18 |
6.6 |
|
Metric Fine |
M10 |
10 |
1.25 |
20.3 |
8.75 |
|
BSW |
5/16" |
7.94 |
1.411 |
18 |
6.5 |
|
UNC |
1/4-20 |
6.35 |
1.27 |
20 |
5.1 |
|
Metric Fine |
M8 |
8.00 |
0.75 |
33.9 |
7.25 |
|
BSW |
1/4" |
6.35 |
1.27 |
20 |
5.1 |
|
Metric Coarse |
M8 |
8.00 |
1.25 |
20.3 |
6.8 |
|
BSW |
9/32" |
7.144 |
1.27 |
20 |
5.8 |
|
UNF |
3/8-24 |
9.53 |
1.058 |
24 |
8.5 |
|
BSF |
3/8" |
9.525 |
1.27 |
20 |
8.3 |
|
BSF |
3/8" |
9.53 |
1.27 |
20 |
8.3 |
|
UNF |
7/16-20 |
11.11 |
1.27 |
20 |
9.9 |
|
UNC |
3/8-16 |
9.53 |
1.588 |
16 |
8 |
|
UNF |
1/2-20 |
12.7 |
1.27 |
20 |
11.5 |
|
BSW |
3/8" |
9.53 |
1.588 |
16 |
7.9 |
|
UNC |
5/16-18 |
7.938 |
1.411 |
18 |
6.6 |
|
Metric Fine |
M10 |
10.00 |
1.25 |
20.3 |
8.75 |
|
BSW |
5/16" |
7.938 |
1.411 |
18 |
6.5 |
|
Metric Coarse |
M10 |
10.00 |
1.5 |
16.9 |
8.5 |
|
BSF |
7/16" |
11.113 |
1.411 |
18 |
9.7 |
|
UNF |
7/16-20 |
11.11 |
1.27 |
20 |
9.9 |
|
Metric Coarse |
M10 |
10 |
1.5 |
16.9 |
8.5 |
|
UNC |
7/16-14 |
11.11 |
1.814 |
14 |
9.4 |
|
UNC |
3/8-16 |
9.525 |
1.588 |
16 |
8 |
|
BSF |
7/16" |
11.11 |
1.411 |
18 |
9.7 |
|
BSW |
3/8" |
9.525 |
1.588 |
16 |
7.9 |
|
BSW |
7/16" |
11.11 |
1.814 |
14 |
9.3 |
|
BSF |
1/2" |
12.7 |
1.588 |
16 |
11.1 |
|
Metric Coarse |
M12 |
12.00 |
1.75 |
14.5 |
10.2 |
|
BSF |
9/16" |
14.288 |
1.588 |
16 |
12.7 |
|
UNF |
1/2-20 |
12.70 |
1.27 |
20 |
11.5 |
|
Metric Coarse |
M12 |
12 |
1.75 |
14.5 |
10.2 |
|
BSF |
1/2" |
12.70 |
1.588 |
16 |
11.1 |
|
UNC |
7/16-14 |
11.11 |
1.814 |
14 |
9.4 |
|
UNC |
1/2-13 |
12.70 |
1.954 |
13 |
10.8 |
|
BSW |
7/16" |
11.113 |
1.814 |
14 |
9.3 |
|
BSW |
1/2" |
12.70 |
2.117 |
12 |
10.5 |
|
UNC |
1/2-13 |
12.7 |
1.954 |
13 |
10.8 |
|
BSF |
9/16" |
14.29 |
1.588 |
16 |
12.7 |
|
BSW |
1/2" |
12.7 |
2.117 |
12 |
10.5 |
|
BSW |
9/16" |
14.29 |
2.117 |
12 |
12.1 |
|
BSW |
9/16" |
14.288 |
2.117 |
12 |
12.1 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
You can download this table in printer friendly PDF form by clicking on the titles
below: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
By ascending diameter 1.0 to
4.7mm |
|
By ascending pitch 0.25 to
0.75mm |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
By ascending diameter 4.76 to
14.3mm |
|
By ascending pitch 0.794 to
2.117mm |
|
|
|
Dimensions for Metric Hex Nuts |
|
 |
|
Thread Size |
Thread Pitch |
A/F Dim |
A/C Dim |
Thickness |
|
F |
G |
H |
|
Max |
Min |
Nom |
Max |
Min |
|
M1* |
0.25 |
2.52 |
2.45 |
2.8 |
0.8 |
0.7 |
|
M1.6 |
0.35 |
3.2 |
3.02 |
3.41 |
1.3 |
1.05 |
|
M2 |
0.4 |
4 |
3.82 |
4.32 |
1.6 |
1.35 |
|
M2.5 |
0.45 |
5 |
4.82 |
5.45 |
2.0 |
1.75 |
|
M3 |
0.5 |
5.5 |
5.32 |
6.01 |
2.4 |
2.15 |
|
M3.5* |
0.6 |
6 |
5.82 |
6.60 |
2.8 |
2.55 |
|
M4 |
0.7 |
7 |
6.78 |
7.66 |
3.2 |
2.9 |
|
M5 |
0.8 |
8 |
7.78 |
8.79 |
4.7 |
4.4 |
|
M6 |
1.0 |
10 |
9.78 |
11.05 |
5.2 |
4.9 |
|
M8 |
1.25 |
13 |
12.73 |
14.38 |
6.8 |
6.44 |
|
M10 |
1.5 |
16 |
15.73 |
17.77 |
8.4 |
8.04 |
|
M12 |
1.75 |
18 |
17.73 |
20.03 |
10.8 |
10.37 |
|
M14 |
2.0 |
21 |
20.67 |
23.35 |
12.8 |
12.1 |
|
M16 |
2.0 |
24 |
23.67 |
26.75 |
14.8 |
14.1 |
*Dimensions for M1 & M3.5 are as
measured from stock samples
A/F (Across flats)
dimensions are also valid for Nylocs and AerotightTM
nuts
|
Wire Gauge Conversion
Table |
|
S.W.G |
Millimetres |
Inches |
|
6 |
4.88 |
0.192 |
|
8 |
4.06 |
0.16 |
|
10 |
3.25 |
0.128 |
|
12 |
2.64 |
0.104 |
|
14 |
2.03 |
0.08 |
|
16 |
1.63 |
0.064 |
|
18 |
1.22 |
0.048 |
|
20 |
0.91 |
0.036 |
|
22 |
0.71 |
0.028 |
|
24 |
0.56 |
0.022 |
|
26 |
0.46 |
0.018 |
|
28 |
0.38 |
0.015 |
|
30 |
0.32 |
0.012 |
Inch to Metric Conversion
Table
In increments of
1/128" with metric equivalent in millimetres to 2 decimal places
(based on 1" = 25.4mm) |
|
|
|
|
|
|
|
|
|
|
|
|
|
Inches |
mm |
|
Inches |
mm |
|
Inches |
mm |
|
Inches |
mm |
|
1/128 |
0.20 |
|
33/128 |
6.55 |
|
65/128 |
12.90 |
|
97/128 |
19.25 |
|
1/64
|
0.40 |
|
17/64
|
6.75 |
|
33/64
|
13.10 |
|
49/64
|
19.45 |
|
3/128 |
0.60 |
|
35/128 |
6.95 |
|
67/128 |
13.30 |
|
99/128 |
19.65 |
|
1/32
|
0.79 |
|
9/32
|
7.14 |
|
17/32
|
13.49 |
|
25/32
|
19.84 |
|
5/128 |
0.99 |
|
37/128 |
7.34 |
|
69/128 |
13.69 |
|
101/128 |
20.04 |
|
3/64
|
1.19 |
|
19/64
|
7.54 |
|
35/64
|
13.89 |
|
51/64
|
20.24 |
|
7/128 |
1.39 |
|
39/128 |
7.74 |
|
71/128 |
14.09 |
|
103/128 |
20.44 |
|
1/16
|
1.59 |
|
5/16
|
7.94 |
|
9/16
|
14.29 |
|
13/16
|
20.64 |
|
9/128 |
1.79 |
|
41/128 |
8.14 |
|
73/128 |
14.49 |
|
105/128 |
20.84 |
|
5/64
|
1.98 |
|
21/64
|
8.33 |
|
37/64
|
14.68 |
|
53/64
|
21.03 |
|
11/128 |
2.18 |
|
43/128 |
8.53 |
|
75/128 |
14.88 |
|
107/128 |
21.23 |
|
3/32
|
2.38 |
|
11/32
|
8.73 |
|
19/32
|
15.08 |
|
27/32
|
21.43 |
|
13/128 |
2.58 |
|
45/128 |
8.93 |
|
77/128 |
15.28 |
|
109/128 |
21.63 |
|
7/64
|
2.78 |
|
23/64
|
9.13 |
|
39/64
|
15.48 |
|
55/64
|
21.83 |
|
15/128 |
2.98 |
|
47/128 |
9.33 |
|
79/128 |
15.68 |
|
111/128 |
22.03 |
|
1/8
|
3.18 |
|
3/8
|
9.53 |
|
5/8
|
15.88 |
|
7/8
|
22.23 |
|
17/128 |
3.37 |
|
49/128 |
9.72 |
|
81/128 |
16.07 |
|
113/128 |
22.42 |
|
9/64
|
3.57 |
|
25/64
|
9.92 |
|
41/64
|
16.27 |
|
57/64
|
22.62 |
|
19/128 |
3.77 |
|
51/128 |
10.12 |
|
83/128 |
16.47 |
|
115/128 |
22.82 |
|
5/32
|
3.97 |
|
13/32
|
10.32 |
|
21/32
|
16.67 |
|
29/32
|
23.02 |
|
21/128 |
4.17 |
|
53/128 |
10.52 |
|
85/128 |
16.87 |
|
117/128 |
23.22 |
|
11/64
|
4.37 |
|
27/64
|
10.72 |
|
43/64
|
17.07 |
|
59/64
|
23.42 |
|
23/128 |
4.56 |
|
55/128 |
10.91 |
|
87/128 |
17.26 |
|
119/128 |
23.61 |
|
3/16
|
4.76 |
|
7/16
|
11.11 |
|
11/16
|
17.46 |
|
15/16
|
23.81 |
|
25/128 |
4.96 |
|
57/128 |
11.31 |
|
89/128 |
17.66 |
|
121/128 |
24.01 |
|
13/64
|
5.16 |
|
29/64
|
11.51 |
|
45/64
|
17.86 |
|
61/64
|
24.21 |
|
27/128 |
5.36 |
|
59/128 |
11.71 |
|
91/128 |
18.06 |
|
123/128 |
24.41 |
|
7/32
|
5.56 |
|
15/32
|
11.91 |
|
23/32
|
18.26 |
|
31/32
|
24.61 |
|
29/128 |
5.75 |
|
61/128 |
12.10 |
|
93/128 |
18.45 |
|
125/128 |
24.80 |
|
15/64
|
5.95 |
|
31/64
|
12.30 |
|
47/64
|
18.65 |
|
63/64
|
25.00 |
|
31/128 |
6.15 |
|
63/128 |
12.50 |
|
95/128 |
18.85 |
|
127/128 |
25.20 |
|
1/4
|
6.35 |
|
1/2
|
12.70 |
|
3/4
|
19.05 |
|
1 |
25.40 |
To download a PDF version of this table
which you can print -
click here
(opens in a new browser
window) |
Drill Size Conversions
Number
sized drills equivalent inch and metric sizes |
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Number
Size |
Metric
Equiv
(mm) |
Inch
Equiv |
|
Number
Size |
Metric
Equiv
(mm) |
Inch
Equiv |
|
Number
Size |
Metric
Equiv
(mm) |
Inch
Equiv |
|
Number
Size |
Metric
Equiv
(mm) |
Inch
Equiv |
|
80 |
0.3429 |
0.0135 |
|
60 |
1.0160 |
0.0400 |
|
40 |
2.4892 |
0.0980 |
|
20 |
4.0894 |
0.1610 |
|
79 |
0.3683 |
0.0145 |
|
59 |
1.0414 |
0.0410 |
|
39 |
2.5273 |
0.0995 |
|
19 |
4.2164 |
0.1660 |
|
78 |
0.4064 |
0.0160 |
|
58 |
1.0668 |
0.0420 |
|
38 |
2.5781 |
0.1015 |
|
18 |
4.3053 |
0.1695 |
|
77 |
0.4572 |
0.0180 |
|
57 |
1.0922 |
0.0430 |
|
37 |
2.6416 |
0.1040 |
|
17 |
4.3942 |
0.1730 |
|
76 |
0.5080 |
0.0200 |
|
56 |
1.1811 |
0.0465 |
|
36 |
2.7051 |
0.1065 |
|
16 |
4.4958 |
0 .1770 |
|
75 |
0.5334 |
0.0210 |
|
55 |
1.3208 |
0.0520 |
|
35 |
2.7940 |
0.1100 |
|
15 |
4.5720 |
0.1800 |
|
74 |
0.5715 |
0.0225 |
|
54 |
1.3970 |
0.0550 |
|
34 |
2.8194 |
0.1110 |
|
14 |
4.6228 |
0.1820 |
|
73 |
0.6096 |
0.0240 |
|
53 |
1.5113 |
0.0595 |
|
33 |
2.8702 |
0.1130 |
|
13 |
4.6990 |
0.1850 |
|
72 |
0.6350 |
0.0250 |
|
52 |
1.6129 |
0.0635 |
|
32 |
2.9464 |
0.1160 |
|
12 |
4.8006 |
0.1890 |
|
71 |
0.6604 |
0.0260 |
|
51 |
1.7018 |
0.0670 |
|
31 |
3.0480 |
0.1200 |
|
11 |
4.8514 |
0.1910 |
|
70 |
0.7112 |
0.0280 |
|
50 |
1.7780 |
0.0700 |
|
30 |
3.2639 |
0.1285 |
|
10 |
4.9149 |
0.1935 |
|
69 |
0.7417 |
0.0292 |
|
49 |
1.8542 |
0.0730 |
|
29 |
3.4544 |
0.1360 |
|
9 |
4.9784 |
0.1960 |
|
68 |
0.7874 |
0.0310 |
|
48 |
1.9304 |
0.0760 |
|
28 |
3.5687 |
0.1405 |
|
8 |
5.0546 |
0.1990 |
|
67 |
0.8128 |
0.0320 |
|
47 |
1.9939 |
0.0785 |
|
27 |
3.6576 |
0.1440 |
|
7 |
5.1054 |
0.2010 |
|
66 |
0.8382 |
0.0330 |
|
46 |
2.0574 |
0.0810 |
|
26 |
3.7338 |
0.1470 |
|
6 |
5.1816 |
0.2040 |
|
65 |
0.8890 |
0.0350 |
|
45 |
2.0828 |
0.0820 |
|
25 |
3.7973 |
0.1495 |
|
5 |
5.2197 |
0.2055 |
|
64 |
0.9144 |
0.0360 |
|
44 |
2.1844 |
0.0860 |
|
24 |
3.8608 |
0.1520 |
|
4 |
5.3086 |
0.2090 |
|
63 |
0.9398 |
0.0370 |
|
43 |
2.2606 |
0.0980 |
|
23 |
3.9116 |
0.1540 |
|
3 |
5.4102 |
0.2130 |
|
62 |
0.9652 |
0.0380 |
|
42 |
2.3749 |
0.0935 |
|
22 |
3.9878 |
0.1570 |
|
2 |
5.6134 |
0.2210 |
|
61 |
0.9906 |
0.0390 |
|
41 |
2.4384 |
0.0960 |
|
21 |
4.0386 |
0.1590 |
|
1 |
5.7912 |
0.2280 |
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This page was last modified on :
September 21, 2024
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