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Screws · ISO 4762 / DIN 912

Grade 8.8 Steel Socket Head Cap Screws

When Socket Head Cap Screws are required in Grade 8.8 Steel, the alternative grades and the trade-offs between them matter as much as the dimensions. This page covers both, plus mechanical and corrosion data.

Why Choose Grade 8.8 Steel for Socket Head Cap Screws

The workhorse medium-carbon alloy grade for structural joints. For socket head cap screws, this matters when requires plating (zinc) for corrosion protection is the primary requirement.

Mechanical & Physical Properties

Grade designationclass 8.8
Magnetic responseMagnetic
Service temperatureup to approx. +300 °C
Corrosion characteristicRequires plating (zinc) for corrosion protection

Corrosion Behavior in Service

Carbon and alloy steel socket head cap screws 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.

Galvanic & Galling Considerations

For socket head cap screws in steel, the dominant compatibility issue is hydrogen embrittlement at high property classes (10.9 and above) when electroplated. Plating must be followed by an appropriate baking treatment, or a non-electroplated finish (mechanical zinc, zinc flake) should be substituted.

Sizes of Socket Head Cap Screws Available in Grade 8.8 Steel

SizePitch (mm)Head diameter dk (mm)Head height k (mm)Hex key s (mm)Socket depth t min (mm)Reference standard
M10.251.91.00.70.5ISO 4762 / DIN 912
M1.20.252.31.20.90.6ISO 4762 / DIN 912
M1.40.32.61.41.00.7ISO 4762 / DIN 912
M1.60.353.01.61.50.7ISO 4762 / DIN 912
M20.43.82.01.51.0ISO 4762 / DIN 912
M2.50.454.52.52.01.1ISO 4762 / DIN 912
M30.55.53.02.51.3ISO 4762 / DIN 912
M40.77.04.03.02.0ISO 4762 / DIN 912
M50.88.55.04.02.5ISO 4762 / DIN 912
M61.010.06.05.03.0ISO 4762 / DIN 912
M81.2513.08.06.04.0ISO 4762 / DIN 912
M101.516.010.08.05.0ISO 4762 / DIN 912
M121.7518.012.010.06.0ISO 4762 / DIN 912
M142.021.014.012.07.0ISO 4762 / DIN 912
M162.024.016.014.08.0ISO 4762 / DIN 912
M182.527.018.014.09.0ISO 4762 / DIN 912
M202.530.020.017.010.0ISO 4762 / DIN 912
M222.533.022.017.011.0ISO 4762 / DIN 912
M243.036.024.019.012.0ISO 4762 / DIN 912
M273.040.027.019.013.5ISO 4762 / DIN 912
M303.545.030.022.015.5ISO 4762 / DIN 912
M333.550.033.024.017.5ISO 4762 / DIN 912
M364.054.036.027.019.0ISO 4762 / DIN 912
M424.563.042.032.021.0ISO 4762 / DIN 912
M485.072.048.036.025.0ISO 4762 / DIN 912

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 (ISO 4762 / DIN 912)

SizePitch (mm)Head diameter dk (mm)Head height k (mm)Hex key s (mm)Socket depth t min (mm)Reference standard
M10.251.91.00.70.5ISO 4762 / DIN 912
M1.20.252.31.20.90.6ISO 4762 / DIN 912
M1.40.32.61.41.00.7ISO 4762 / DIN 912
M1.60.353.01.61.50.7ISO 4762 / DIN 912
M20.43.82.01.51.0ISO 4762 / DIN 912
M2.50.454.52.52.01.1ISO 4762 / DIN 912
M30.55.53.02.51.3ISO 4762 / DIN 912
M40.77.04.03.02.0ISO 4762 / DIN 912
M50.88.55.04.02.5ISO 4762 / DIN 912
M61.010.06.05.03.0ISO 4762 / DIN 912
M81.2513.08.06.04.0ISO 4762 / DIN 912
M101.516.010.08.05.0ISO 4762 / DIN 912
M121.7518.012.010.06.0ISO 4762 / DIN 912
M142.021.014.012.07.0ISO 4762 / DIN 912
M162.024.016.014.08.0ISO 4762 / DIN 912
M182.527.018.014.09.0ISO 4762 / DIN 912
M202.530.020.017.010.0ISO 4762 / DIN 912
M222.533.022.017.011.0ISO 4762 / DIN 912
M243.036.024.019.012.0ISO 4762 / DIN 912
M273.040.027.019.013.5ISO 4762 / DIN 912
M303.545.030.022.015.5ISO 4762 / DIN 912
M333.550.033.024.017.5ISO 4762 / DIN 912
M364.054.036.027.019.0ISO 4762 / DIN 912
M424.563.042.032.021.0ISO 4762 / DIN 912
M485.072.048.036.025.0ISO 4762 / DIN 912

Frequently Asked Questions

What corrosion resistance do Grade 8.8 Steel Socket Head Cap Screws offer?

Grade 8.8 Steel Socket Head Cap Screws provide requires plating (zinc) for corrosion protection with a service range of up to approx. +300 °C.

When should I move from class 8.8 to class 10.9 / 12.9 for Socket Head Cap Screws?

Step up to class 10.9 / 12.9 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 8.8 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 Socket Head Cap Screws?

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.