Washers · DIN 6798

M4 Serrated Lock Washers

A serrated lock washer in M4: this guide pulls the row from the standard, adds the assembly numbers an engineer actually uses, and links you straight to a quote.

M4 Dimensional Row (DIN 6798)

For size	Inner diameter d1 (mm)	Outer diameter d2 (mm)	Thickness h (mm)	Type	Reference standard
M4	4.3	7.6	0.5	Internal-tooth type A	DIN 6798 A/J

Spanner & Drive for M4 Serrated Lock Washers

Drive geometry for M4 Serrated Lock Washers is given by the row above; match the tool to the listed values.

Common Applications for M4 Serrated Lock Washers

M4 Serrated Lock Washers are commonly specified for small electronics hardware and precision assemblies.

Installation Tips for M4 Serrated Lock Washers

At M4 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 M4

A M4 flat washer pairs with a M4 bolt/screw and matching M4 nut.

When to Step Up or Down from M4

When the joint preload approaches the proof load of M4 class 8.8, step up to M5 class 8.8 (or move to M4 class 10.9). When the joint is over-specified, M3 often saves weight and cost without losing the safety margin.

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

Adjust the parameters in the drawing above and click "Request this configuration" to send the exact specification straight to this form.

Category Type Standard Thread size Material Finish

Dimensions & Specifications (DIN 6798)

For size	Inner diameter d1 (mm)	Outer diameter d2 (mm)	Thickness h (mm)	Type	Reference standard
M3	3.2	6.0	0.5	Internal-tooth type A	DIN 6798 A/J
M4	4.3	7.6	0.5	Internal-tooth type A	DIN 6798 A/J
M5	5.3	9.2	0.6	Internal-tooth type A	DIN 6798 A/J
M6	6.4	11.0	0.7	Internal-tooth type A	DIN 6798 A/J
M8	8.4	14.8	0.8	Internal-tooth type A	DIN 6798 A/J
M10	10.5	18.0	0.9	Internal-tooth type A	DIN 6798 A/J
M12	13.0	21.5	1.0	Internal-tooth type A	DIN 6798 A/J
M16	17.0	27.0	1.2	Internal-tooth type A	DIN 6798 A/J
M20	21.0	33.0	1.5	Internal-tooth type A	DIN 6798 A/J
M3	3.2	7.0	0.5	External-tooth type J	DIN 6798 A/J
M4	4.3	9.0	0.5	External-tooth type J	DIN 6798 A/J
M5	5.3	10.0	0.6	External-tooth type J	DIN 6798 A/J
M6	6.4	12.0	0.7	External-tooth type J	DIN 6798 A/J
M8	8.4	15.0	0.8	External-tooth type J	DIN 6798 A/J
M10	10.5	19.0	0.9	External-tooth type J	DIN 6798 A/J
M12	13.0	22.0	1.0	External-tooth type J	DIN 6798 A/J
M16	17.0	28.0	1.2	External-tooth type J	DIN 6798 A/J
M20	21.0	34.0	1.5	External-tooth type J	DIN 6798 A/J

Frequently Asked Questions

What clearance and tapping drill suit M4?

Use a 4.5 mm clearance hole (ISO 273 medium) for through-fixing, or a 3.3 mm tapping drill for a coarse M4 thread.

Is M4 Serrated Lock Washers suitable for electronics and small mechanisms?

M4 Serrated Lock Washers 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.

What's the typical proof load behavior of M4 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 M4?

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.

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.