Dimensional data for M3 Spring Lock Washer. Selection is by nominal bolt size rather than by thread, so the controlling figures are the ones in the row below together with the fit and tolerance the mating feature requires.
M3 Dimensional Row (GB/T 5782 / ISO 4014)
For bolt size
Inner diameter d1 (mm)
Outer diameter d2 (mm)
Width b (mm)
Thickness t (mm)
Reference standard
M3
3.1
6.2
1.0
0.8
GB/T 93 / DIN 127B
Common Applications for M3 Spring Lock Washer — GB/T 5782 / ISO 4014 (Series 003)
M3 Spring Lock Washer — GB/T 5782 / ISO 4014 (Series 003) 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 (GB/T 5782 / ISO 4014)
For bolt size
Inner diameter d1 (mm)
Outer diameter d2 (mm)
Width b (mm)
Thickness t (mm)
Reference standard
M3
3.1
6.2
1.0
0.8
GB/T 93 / DIN 127B
M4
4.1
7.6
1.2
1.0
GB/T 93 / DIN 127B
M5
5.1
9.2
1.5
1.2
GB/T 93 / DIN 127B
M6
6.1
11.8
2.0
1.6
GB/T 93 / DIN 127B
M8
8.1
14.8
2.5
2.0
GB/T 93 / DIN 127B
M10
10.2
18.1
3.0
2.5
GB/T 93 / DIN 127B
M12
12.2
21.1
3.5
3.0
GB/T 93 / DIN 127B
M14
14.2
24.1
4.0
3.5
GB/T 93 / DIN 127B
M16
16.2
27.4
4.5
4.0
GB/T 93 / DIN 127B
M18
18.2
29.4
5.0
4.5
GB/T 93 / DIN 127B
M20
20.2
33.6
5.5
5.0
GB/T 93 / DIN 127B
M24
24.5
40.1
6.5
6.0
GB/T 93 / DIN 127B
M30
30.5
50.0
8.0
7.5
GB/T 93 / DIN 127B
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
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 Spring Lock Washer — GB/T 5782 / ISO 4014 (Series 003)?
For M3 the standard coarse pitch is 0.5 mm — this is the value used for Spring Lock Washer — GB/T 5782 / ISO 4014 (Series 003).
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.
Is M3 Spring Lock Washer — GB/T 5782 / ISO 4014 (Series 003) suitable for electronics and small mechanisms?
M3 Spring Lock Washer — GB/T 5782 / ISO 4014 (Series 003) 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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