The M2 size of Hex Nuts is dimensioned by ISO 4032 / ISO 4033. The table below gives the dimensional row from the standard, followed by the drive and the installation notes for this type.
M2 Dimensional Row (ISO 4032 / ISO 4033)
Size
Pitch (mm)
Width across flats s (mm)
Width across corners e min (mm)
Nut height m style 1 (mm)
Nut height m style 2 (mm)
Reference standard
M2
0.4
4.0
4.32
1.6
-
ISO 4032 (Style1) / ISO 4033 (Style2)
Spanner & Drive for M2 Hex Nuts
M2 Hex Nuts have a width across flats of 4.0 mm — fit a 4.0 mm open-ended spanner or socket. Use a 6-point socket for tight clearances and to reduce rounding; for repeated assembly choose a torque wrench so the joint preload is repeatable.
Common Applications for M2 Hex Nuts
M2 Hex Nuts are commonly specified for paired with the same-size screws on PCB hardware, light enclosures and small-scale assemblies.
Installation Tips for M2 Hex Nuts
Use a 6-point socket where access allows — 12-point sockets are more prone to rounding the corners on smaller sizes.
On flanged or serrated variants, do NOT add a separate flat washer — the flange already spreads the load and the washer can defeat the locking serrations.
At M2 the joint is sensitive to over-torque — use a torque-limiting driver and check the head doesn't bury into a softer counterpart.
Mating Parts for M2
Pair M2 with the matching M2 bolt or screw, plus a M2 flat washer where required to distribute load on softer materials.
Technical Drawing
Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.
Sends the selected values to the quote form below.
Request a Quote
The form below follows the current technical drawing configuration. Change the drawing values above and the request details update automatically.
Dimensions & Specifications (ISO 4032 / ISO 4033)
Size
Pitch (mm)
Width across flats s (mm)
Width across corners e min (mm)
Nut height m style 1 (mm)
Nut height m style 2 (mm)
Reference standard
M1
0.25
2.5
2.71
0.8
-
ISO 4032 (Style1) / ISO 4033 (Style2)
M1.2
0.25
3.0
3.28
1.0
-
ISO 4032 (Style1) / ISO 4033 (Style2)
M1.4
0.3
3.0
3.28
1.2
-
ISO 4032 (Style1) / ISO 4033 (Style2)
M1.6
0.35
3.2
3.48
1.3
-
ISO 4032 (Style1) / ISO 4033 (Style2)
M2
0.4
4.0
4.32
1.6
-
ISO 4032 (Style1) / ISO 4033 (Style2)
M2.5
0.45
5.0
5.45
2.0
-
ISO 4032 (Style1) / ISO 4033 (Style2)
M3
0.5
5.5
6.01
2.4
-
ISO 4032 (Style1) / ISO 4033 (Style2)
M3.5
0.6
6.0
6.58
2.8
-
ISO 4032 (Style1) / ISO 4033 (Style2)
M4
0.7
7.0
7.66
3.2
-
ISO 4032 (Style1) / ISO 4033 (Style2)
M5
0.8
8.0
8.79
4.0
5.0
ISO 4032 (Style1) / ISO 4033 (Style2)
M6
1.0
10.0
11.05
5.0
6.0
ISO 4032 (Style1) / ISO 4033 (Style2)
M8
1.25
13.0
14.38
6.5
8.0
ISO 4032 (Style1) / ISO 4033 (Style2)
M10
1.5
16.0
17.77
8.0
10.0
ISO 4032 (Style1) / ISO 4033 (Style2)
M12
1.75
18.0
20.03
10.0
12.0
ISO 4032 (Style1) / ISO 4033 (Style2)
M14
2.0
21.0
23.36
11.0
14.0
ISO 4032 (Style1) / ISO 4033 (Style2)
M16
2.0
24.0
26.75
13.0
16.0
ISO 4032 (Style1) / ISO 4033 (Style2)
M18
2.5
27.0
29.56
15.0
18.0
ISO 4032 (Style1) / ISO 4033 (Style2)
M20
2.5
30.0
32.95
16.0
20.0
ISO 4032 (Style1) / ISO 4033 (Style2)
M22
2.5
32.0
35.03
18.0
22.0
ISO 4032 (Style1) / ISO 4033 (Style2)
M24
3.0
36.0
39.55
19.0
24.0
ISO 4032 (Style1) / ISO 4033 (Style2)
M27
3.0
41.0
45.2
22.0
27.0
ISO 4032 (Style1) / ISO 4033 (Style2)
M30
3.5
46.0
50.85
24.0
30.0
ISO 4032 (Style1) / ISO 4033 (Style2)
M33
3.5
50.0
55.37
26.0
33.0
ISO 4032 (Style1) / ISO 4033 (Style2)
M36
4.0
55.0
60.79
29.0
36.0
ISO 4032 (Style1) / ISO 4033 (Style2)
M39
4.0
60.0
66.44
31.0
39.0
ISO 4032 (Style1) / ISO 4033 (Style2)
M42
4.5
65.0
71.3
34.0
42.0
ISO 4032 (Style1) / ISO 4033 (Style2)
M45
4.5
70.0
76.95
36.0
45.0
ISO 4032 (Style1) / ISO 4033 (Style2)
M48
5.0
75.0
82.6
38.0
48.0
ISO 4032 (Style1) / ISO 4033 (Style2)
M52
5.0
80.0
88.25
42.0
52.0
ISO 4032 (Style1) / ISO 4033 (Style2)
M56
5.5
85.0
93.56
45.0
56.0
ISO 4032 (Style1) / ISO 4033 (Style2)
M60
5.5
90.0
99.21
48.0
60.0
ISO 4032 (Style1) / ISO 4033 (Style2)
M64
6.0
95.0
104.86
51.0
64.0
ISO 4032 (Style1) / ISO 4033 (Style2)
Materials & Grades
Select a material class to see the grades we supply it in. Each designation is listed with its ISO/EN, AISI/SAE, JIS and GB equivalents.
Third-party video, selected automatically for this topic. It is not produced by Engineering Hardware and is not a specification source — use the tables on this page for dimensional data.
Inside the plant
Manufactured in our own plant
This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided.
01
Cold heading
Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail.
Head dimensions and under-head radius checked at set-up and per shift.
02
Thread rolling
Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch.
Go / no-go ring gauges to ISO 965 tolerance class 6g.
03
Heat treatment
Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it.
Core hardness and tensile tested per lot to ISO 898-1.
04
Surface treatment
Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list.
Coating thickness and neutral salt spray hours to ISO 9227.
Frequently Asked Questions
What's the typical proof load behavior of M2 class 8.8?
Micro-thread joints are sensitive to plastic deformation in the first turn under load — use a torque-limiting driver and check the bearing surface deformation on softer mating materials.
What is the height of an M2 nut?
The nominal height of a style-1 ISO 4032 M2 nut is in the spec table on this page. Style-2 (thick) is approximately 1.1× this height; thin (ISO 4035 / DIN 439) is approximately 0.5×.
What spanner size fits M2 Hex Nuts?
The width across flats for M2 Hex Nuts is 4.0 mm, so a 4.0 mm spanner or 6-point socket fits.
Is M2 Hex Nuts suitable for electronics and small mechanisms?
M2 Hex Nuts is in the micro range and is widely used in electronics, instrument enclosures and small precision mechanisms. Watch the over-torque margin — micro joints strip easily.
How do I request a quotation?
Use the technical drawing on this page to pick the exact configuration, then submit it with the quote form. We respond within one business day.
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