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Washers · GB/T 858

M5 Plain Washer Dimensions & Specifications

M5 Plain Washer Dimensions & Specifications reference image

M5 is one of the standard coarse-thread sizes for plain washer under GB/T 858. The sections below reproduce the dimensional row, list the matching tools and hole sizes, and summarize where this size is normally specified.

M5 Dimensional Row (GB/T 858)

For bolt sizeInner diameter d1 (mm)Outer diameter d2 (mm)Thickness t (mm)Reference standard
M55.310.01.0ISO 7089 / GB/T 97.1

Spanner & Drive for M5 Plain Washer — GB/T 858 (Series 071)

Drive geometry for M5 Plain Washer — GB/T 858 (Series 071) is given by the row above; match the tool to the listed values.

Common Applications for M5 Plain Washer — GB/T 858 (Series 071)

M5 Plain Washer — GB/T 858 (Series 071) are commonly specified for small electronics hardware and precision assemblies.

Installation Tips for M5 Plain Washer — GB/T 858 (Series 071)

  • At M5 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 M5

A M5 flat washer pairs with a M5 bolt/screw and matching M5 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

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 858)

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 M5?

Use a 5.5 mm clearance hole (ISO 273 medium) for through-fixing, or a 4.2 mm tapping drill for a coarse M5 thread.

Is M5 Plain Washer — GB/T 858 (Series 071) suitable for electronics and small mechanisms?

M5 Plain Washer — GB/T 858 (Series 071) 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 M5 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 M5?

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.