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Screws · GB/T 818 / ISO 7045

Grade 8.8 Steel Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 035)

Grade 8.8 Steel Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 035) pairs the standard GB/T 818 / ISO 7045 with a Grade 8.8 Steel base material. The sections below cover why engineers select this grade for phillips pan head machine screw — gb/t 818 / iso 7045 (series 035), its corrosion and temperature behavior, and the sizes available.

Why Choose Grade 8.8 Steel for Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 035)

The workhorse medium-carbon alloy grade for structural joints. For phillips pan head machine screw — gb/t 818 / iso 7045 (series 035), 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

Galvanic & Galling Considerations

For phillips pan head machine screw — gb/t 818 / iso 7045 (series 035) 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.

Comparable Grades

For Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 035), class 10.9 or 12.9 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 Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 035) Available in Grade 8.8 Steel

SizePitch (mm)Length L (mm)Head diameter dk (mm)Head height k (mm)Cross recessReference standard
M30.5205.61.8PH1ISO 7045 / GB/T 818
M40.7258.02.4PH2ISO 7045 / GB/T 818
M50.8309.53.0PH2ISO 7045 / GB/T 818
M61.04012.03.6PH3ISO 7045 / GB/T 818
M81.255016.04.8PH3ISO 7045 / GB/T 818
M101.56020.06.0PH4ISO 7045 / GB/T 818

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 818 / ISO 7045)

SizePitch (mm)Length L (mm)Head diameter dk (mm)Head height k (mm)Cross recessReference standard
M30.5205.61.8PH1ISO 7045 / GB/T 818
M40.7258.02.4PH2ISO 7045 / GB/T 818
M50.8309.53.0PH2ISO 7045 / GB/T 818
M61.04012.03.6PH3ISO 7045 / GB/T 818
M81.255016.04.8PH3ISO 7045 / GB/T 818
M101.56020.06.0PH4ISO 7045 / GB/T 818

Frequently Asked Questions

What corrosion resistance do Grade 8.8 Steel Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 035) offer?

Grade 8.8 Steel Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 035) 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 Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 035)?

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 Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 035)?

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.