M3 Wave Washers (Curved Spring Washers) Dimensions
Controlling dimensions to DIN 137 B, with tolerances and fit.
M3 Wave Washers (Curved Spring Washers) dimensions to DIN 137 B: inside diameter 3.2 mm, outside diameter 6 mm, thickness 0.3 mm, coarse thread pitch 0.5 mm.
Inside diameter
3.2 mm
Outside diameter
6 mm
Thickness
0.3 mm
Coarse thread pitch
0.5 mm
Figures are nominal values from the governing standard. Confirm against the tolerance class for your application before machining or ordering.
Hidden Deck Fasteners Sourcing: Manufacturing, Types & Material Compatibility
The M3 size of Wave Washers (Curved Spring Washers) is dimensioned by DIN 137 B. The table below gives the dimensional row from the standard, followed by the installation notes for this type.
M3 Dimensional Row (DIN 137 B)
Thread size
Inner diameter d1 (mm)
Outer diameter d2 (mm)
Material thickness s (mm)
Free height h (mm)
Reference standard
M3
3.2
6
0.3
0.7
DIN 137 B
Common Applications for M3 Wave Washers (Curved Spring Washers)
M3 Wave Washers (Curved Spring Washers) are commonly specified for small electronics hardware and precision assemblies.
Mating Parts for M3
A M3 flat washer pairs with a M3 bolt/screw and matching M3 nut.
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 (DIN 137 B)
Thread size
Inner diameter d1 (mm)
Outer diameter d2 (mm)
Material thickness s (mm)
Free height h (mm)
Reference standard
M3
3.2
6
0.3
0.7
DIN 137 B
M4
4.3
8
0.3
0.8
DIN 137 B
M5
5.3
10
0.4
1.0
DIN 137 B
M6
6.4
11.8
0.5
1.2
DIN 137 B
M8
8.4
15
0.5
1.4
DIN 137 B
M10
10.5
18
0.6
1.7
DIN 137 B
M12
13
20.5
0.8
2.1
DIN 137 B
M14
15
24
0.8
2.3
DIN 137 B
M16
17
26
1.0
2.6
DIN 137 B
M20
21
32
1.2
3.2
DIN 137 B
M24
25
38
1.5
3.8
DIN 137 B
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 M3 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.
Which washer dimensions matter most for M3?
For a flat washer, the outside diameter (the bearing surface) and the thickness control how the load is spread under the head and how much elastic preload is preserved. The inside diameter must clear the bolt body but not be so large that the head bears mostly on the washer's outer rim.
What is the coarse-thread pitch of M3 for Wave Washers (Curved Spring Washers)?
For M3 the standard coarse pitch is 0.5 mm — this is the value used for Wave Washers (Curved Spring Washers).
What clearance and tapping drill suit M3?
Use a 3.4 mm clearance hole (ISO 273 medium) for through-fixing, or a 2.5 mm tapping drill for a coarse M3 thread.
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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