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Washers · GB/T 97.1 / ISO 7089

M12 Flat Plain Washer (GB/T 95) — GB/T 97.1 / ISO 7089 (Series 086)

For Flat Plain Washer (GB/T 95) — GB/T 97.1 / ISO 7089 (Series 086), the M12 thread sits in the medium range of the catalog and is one of the most-asked flat plain washer (gb/t 95) — gb/t 97.1 / iso 7089 (series 086) in this family. The dimensional and assembly data follow.

M12 Dimensional Row (GB/T 97.1 / ISO 7089)

For bolt sizeInner diameter d1 (mm)Outer diameter d2 (mm)Thickness t (mm)Reference standard
M1213.024.02.5ISO 7089 / GB/T 97.1

Spanner & Drive for M12 Flat Plain Washer (GB/T 95) — GB/T 97.1 / ISO 7089 (Series 086)

Drive geometry for M12 Flat Plain Washer (GB/T 95) — GB/T 97.1 / ISO 7089 (Series 086) is given by the row above; match the tool to the listed values.

Common Applications for M12 Flat Plain Washer (GB/T 95) — GB/T 97.1 / ISO 7089 (Series 086)

M12 Flat Plain Washer (GB/T 95) — GB/T 97.1 / ISO 7089 (Series 086) are commonly specified for medium-duty structural joints.

Mating Parts for M12

A M12 flat washer pairs with a M12 bolt/screw and matching M12 nut.

When to Step Up or Down from M12

When the joint preload approaches the proof load of M12 class 8.8, step up to M16 class 8.8 (or move to M12 class 10.9). When the joint is over-specified, M10 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 (GB/T 97.1 / ISO 7089)

For bolt sizeInner diameter d1 (mm)Outer diameter d2 (mm)Thickness t (mm)Reference standard
M33.27.00.5ISO 7089 / GB/T 97.1
M44.39.00.8ISO 7089 / GB/T 97.1
M55.310.01.0ISO 7089 / GB/T 97.1
M66.412.01.6ISO 7089 / GB/T 97.1
M88.416.01.6ISO 7089 / GB/T 97.1
M1010.520.02.0ISO 7089 / GB/T 97.1
M1213.024.02.5ISO 7089 / GB/T 97.1
M1415.028.02.5ISO 7089 / GB/T 97.1
M1617.030.03.0ISO 7089 / GB/T 97.1
M1819.034.03.0ISO 7089 / GB/T 97.1
M2021.037.03.0ISO 7089 / GB/T 97.1
M2425.044.04.0ISO 7089 / GB/T 97.1
M3031.056.04.0ISO 7089 / GB/T 97.1
M3637.066.05.0ISO 7089 / GB/T 97.1

Frequently Asked Questions

What clearance and tapping drill suit M12?

Use a 13.5 mm clearance hole (ISO 273 medium) for through-fixing, or a 10.2 mm tapping drill for a coarse M12 thread.

Which washer dimensions matter most for M12?

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 M12 for Flat Plain Washer (GB/T 95) — GB/T 97.1 / ISO 7089 (Series 086)?

For M12 the standard coarse pitch is 1.75 mm — this is the value used for Flat Plain Washer (GB/T 95) — GB/T 97.1 / ISO 7089 (Series 086).

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.