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Washers · GB/T 93 / DIN 127B

Grade 12.9 Steel Spring Lock Washer (GB/T 93)

Grade 12.9 Steel Spring Lock Washer (GB/T 93) reference image

Material specification page for spring lock washer (gb/t 93) in Grade 12.9 Steel. Covers the grade designation (class 12.9), corrosion and magnetic behavior, comparable grades and their trade-offs, and the sizes available to GB/T 93 / DIN 127B.

Why Choose Grade 12.9 Steel for Spring Lock Washer (GB/T 93) — GB/T 93 / DIN 127B (Series 081)

The highest common strength class, for high-load machine assembly. For spring lock washer (gb/t 93) — gb/t 93 / din 127b (series 081), this matters when requires plating or black-oxide protection is the primary requirement.

Mechanical & Physical Properties

Grade designationclass 12.9
Magnetic responseMagnetic
Service temperatureup to approx. +300 °C
Corrosion characteristicRequires plating or black-oxide protection

Corrosion Behavior in Service

Carbon and alloy steel spring lock washer (gb/t 93) — gb/t 93 / din 127b (series 081) require a coating for corrosion protection. Zinc plating (with or without passivation) is the most common; hot-dip galvanizing is used for outdoor structural service; black-oxide is mainly a tarnish-prevention finish for tool-room use.

Comparable Grades

For Spring Lock Washer (GB/T 93) — GB/T 93 / DIN 127B (Series 081), class 8.8 is the comparable strength step. Move up when the joint preload approaches the proof load of the current class; move down when the joint is over-specified. For corrosion-critical service, switch to stainless A2 or A4.

Sizes of Spring Lock Washer (GB/T 93) — GB/T 93 / DIN 127B (Series 081) Available in Grade 12.9 Steel

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

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.

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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

What corrosion resistance do Grade 12.9 Steel Spring Lock Washer (GB/T 93) — GB/T 93 / DIN 127B (Series 081) offer?

Grade 12.9 Steel Spring Lock Washer (GB/T 93) — GB/T 93 / DIN 127B (Series 081) provide requires plating or black-oxide protection with a service range of up to approx. +300 °C.

When should I move from class 12.9 to class 8.8 for Spring Lock Washer (GB/T 93) — GB/T 93 / DIN 127B (Series 081)?

Step up to class 8.8 when the joint preload approaches the proof load of the current class. The higher class adds preload at the same diameter, often saving size and weight.

Is Grade 12.9 Steel prone to hydrogen embrittlement?

Class 10.9 and above can be susceptible to hydrogen embrittlement when electroplated. Specify post-plating baking, or use mechanical-zinc / zinc-flake finishes which avoid the cathodic plating step.

Which finish is best for outdoor Spring Lock Washer (GB/T 93) — GB/T 93 / DIN 127B (Series 081)?

For outdoor service in steel, hot-dip galvanizing gives the longest life; zinc-flake (Geomet/Delta-Tone family) gives a thinner film with excellent salt-spray performance; standard zinc plating is the lowest-cost option for general indoor / shielded outdoor use.

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.