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Washers · GB/T 93 / DIN 127B

M4 Spring Lock Washer Dimensions & Specifications

M4 Spring Lock Washer Dimensions & Specifications reference image

M4 is one of the standard coarse-thread sizes for spring lock washer under GB/T 93 / DIN 127B. The sections below reproduce the dimensional row, list the matching tools and hole sizes, and summarize where this size is normally specified.

M4 Dimensional Row (GB/T 93 / DIN 127B)

For bolt sizeInner diameter d1 (mm)Outer diameter d2 (mm)Width b (mm)Thickness t (mm)Reference standard
M44.17.61.21.0GB/T 93 / DIN 127B

Spanner & Drive for M4 Spring Lock Washer — GB/T 93 / DIN 127B (Series 082)

Drive geometry for M4 Spring Lock Washer — GB/T 93 / DIN 127B (Series 082) is given by the row above; match the tool to the listed values.

Common Applications for M4 Spring Lock Washer — GB/T 93 / DIN 127B (Series 082)

M4 Spring Lock Washer — GB/T 93 / DIN 127B (Series 082) are commonly specified for small electronics hardware and precision assemblies.

Installation Tips for M4 Spring Lock Washer — GB/T 93 / DIN 127B (Series 082)

  • 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 93 / DIN 127B)

For bolt sizeInner diameter d1 (mm)Outer diameter d2 (mm)Width b (mm)Thickness t (mm)Reference standard
M33.16.21.00.8GB/T 93 / DIN 127B
M44.17.61.21.0GB/T 93 / DIN 127B
M55.19.21.51.2GB/T 93 / DIN 127B
M66.111.82.01.6GB/T 93 / DIN 127B
M88.114.82.52.0GB/T 93 / DIN 127B
M1010.218.13.02.5GB/T 93 / DIN 127B
M1212.221.13.53.0GB/T 93 / DIN 127B
M1414.224.14.03.5GB/T 93 / DIN 127B
M1616.227.44.54.0GB/T 93 / DIN 127B
M1818.229.45.04.5GB/T 93 / DIN 127B
M2020.233.65.55.0GB/T 93 / DIN 127B
M2424.540.16.56.0GB/T 93 / DIN 127B
M3030.550.08.07.5GB/T 93 / DIN 127B

Frequently Asked Questions

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 Spring Lock Washer — GB/T 93 / DIN 127B (Series 082)?

For M4 the standard coarse pitch is 0.7 mm — this is the value used for Spring Lock Washer — GB/T 93 / DIN 127B (Series 082).

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 Spring Lock Washer — GB/T 93 / DIN 127B (Series 082) suitable for electronics and small mechanisms?

M4 Spring Lock Washer — GB/T 93 / DIN 127B (Series 082) 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.

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.