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Washers · GB/T 852

M4 Wedge / Taper Washer Dimensions & Specifications

M4 Wedge / Taper Washer Dimensions & Specifications reference image

This page covers M4 Wedge / Taper Washer to GB/T 852: the full dimensional row, hole and tool sizes, proof-load data and typical applications. All values are taken from the governing standards (GB/T 852 together with ISO 273, ISO 724 and ISO 898-1 where applicable).

M4 Dimensional Row (GB/T 852)

For bolt sizeInner diameter d1 (mm)Outer diameter d2 (mm)Mean thickness t (mm)SlopeReference standard
M44.581.61:6DIN 6917 / GB/T 853

Spanner & Drive for M4 Wedge / Taper Washer — GB/T 852 (Series 084)

Drive geometry for M4 Wedge / Taper Washer — GB/T 852 (Series 084) is given by the row above; match the tool to the listed values.

Common Applications for M4 Wedge / Taper Washer — GB/T 852 (Series 084)

M4 Wedge / Taper Washer — GB/T 852 (Series 084) are commonly specified for small electronics hardware and precision assemblies.

Installation Tips for M4 Wedge / Taper Washer — GB/T 852 (Series 084)

  • 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.

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 852)

For bolt sizeInner diameter d1 (mm)Outer diameter d2 (mm)Mean thickness t (mm)SlopeReference standard
M33.561.21:6DIN 6917 / GB/T 853
M44.581.61:6DIN 6917 / GB/T 853
M55.5112.01:6DIN 6917 / GB/T 853
M66.5132.41:6DIN 6917 / GB/T 853
M88.5173.21:6DIN 6917 / GB/T 853
M1010.5224.01:6DIN 6917 / GB/T 853
M1212.5264.81:6DIN 6917 / GB/T 853
M1414.5305.61:6DIN 6917 / GB/T 853
M1616.5356.41:6DIN 6917 / GB/T 853
M1818.5397.21:6DIN 6917 / GB/T 853

Frequently Asked Questions

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.

What is the coarse-thread pitch of M4 for Wedge / Taper Washer — GB/T 852 (Series 084)?

For M4 the standard coarse pitch is 0.7 mm — this is the value used for Wedge / Taper Washer — GB/T 852 (Series 084).

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.

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.