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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 034)

When Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 034) 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 Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 034)

The workhorse medium-carbon alloy grade for structural joints. For phillips pan head machine screw — gb/t 818 / iso 7045 (series 034), 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 phillips pan head machine screw — gb/t 818 / iso 7045 (series 034) 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 Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 034), 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 034) 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

Which finish is best for outdoor Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 034)?

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.

What's the service temperature limit for Grade 8.8 Steel?

The practical service range is up to approx. +300 °C.

Can Grade 8.8 Steel replace stainless steel structurally?

No — stainless A2/A4 cannot match class 10.9 / 12.9 strength. Stainless is selected for corrosion, not raw strength.

Are Grade 8.8 Steel Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 034) magnetic?

Grade 8.8 Steel Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 034) are magnetic.

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.