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Washers · DIN 6798

M8 Serrated Lock Washers Dimensions & Specifications

M8 Serrated Lock Washers Dimensions & Specifications reference image

M8 is one of the standard coarse-thread sizes for serrated lock washers under DIN 6798. The sections below reproduce the dimensional row, list the matching tools and hole sizes, and summarize where this size is normally specified.

M8 Dimensional Row (DIN 6798)

For sizeInner diameter d1 (mm)Outer diameter d2 (mm)Thickness h (mm)TypeReference standard
M88.414.80.8Internal-tooth type ADIN 6798 A/J

Spanner & Drive for M8 Serrated Lock Washers

Drive geometry for M8 Serrated Lock Washers is given by the row above; match the tool to the listed values.

Common Applications for M8 Serrated Lock Washers

M8 Serrated Lock Washers are commonly specified for general-purpose load-spreading and locking under machine bolts.

Mating Parts for M8

A M8 flat washer pairs with a M8 bolt/screw and matching M8 nut.

When to Step Up or Down from M8

When the joint preload approaches the proof load of M8 class 8.8, step up to M10 class 8.8 (or move to M8 class 10.9). When the joint is over-specified, M6 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.

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

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Specification
Business Information

Dimensions & Specifications (DIN 6798)

For sizeInner diameter d1 (mm)Outer diameter d2 (mm)Thickness h (mm)TypeReference standard
M33.26.00.5Internal-tooth type ADIN 6798 A/J
M44.37.60.5Internal-tooth type ADIN 6798 A/J
M55.39.20.6Internal-tooth type ADIN 6798 A/J
M66.411.00.7Internal-tooth type ADIN 6798 A/J
M88.414.80.8Internal-tooth type ADIN 6798 A/J
M1010.518.00.9Internal-tooth type ADIN 6798 A/J
M1213.021.51.0Internal-tooth type ADIN 6798 A/J
M1617.027.01.2Internal-tooth type ADIN 6798 A/J
M2021.033.01.5Internal-tooth type ADIN 6798 A/J
M33.27.00.5External-tooth type JDIN 6798 A/J
M44.39.00.5External-tooth type JDIN 6798 A/J
M55.310.00.6External-tooth type JDIN 6798 A/J
M66.412.00.7External-tooth type JDIN 6798 A/J
M88.415.00.8External-tooth type JDIN 6798 A/J
M1010.519.00.9External-tooth type JDIN 6798 A/J
M1213.022.01.0External-tooth type JDIN 6798 A/J
M1617.028.01.2External-tooth type JDIN 6798 A/J
M2021.034.01.5External-tooth type JDIN 6798 A/J

Frequently Asked Questions

Which washer dimensions matter most for M8?

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 M8 for Serrated Lock Washers?

For M8 the standard coarse pitch is 1.25 mm — this is the value used for Serrated Lock Washers.

What clearance and tapping drill suit M8?

Use a 9 mm clearance hole (ISO 273 medium) for through-fixing, or a 6.8 mm tapping drill for a coarse M8 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.