Skip to content
info@engineeringhardware.com
Request a Quote

Screws · ISO 7046 / DIN 965

Grade 8.8 Steel Phillips Countersunk Screws

For Phillips Countersunk Screws in Grade 8.8 Steel, the controlling decisions are corrosion, strength and service temperature. This guide summarizes those three for Grade 8.8 Steel Phillips Countersunk Screws and lists every size we supply.

Why Choose Grade 8.8 Steel for Phillips Countersunk Screws

The workhorse medium-carbon alloy grade for structural joints. For phillips countersunk 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 phillips countersunk 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.

Comparable Grades

For Phillips Countersunk Screws, 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 Countersunk Screws Available in Grade 8.8 Steel

SizePitch (mm)Head diameter dk (mm)Head height k (mm)Cross recessCountersink angle (deg)Reference standard
M1.60.353.00.96PH090ISO 7046 / DIN 965
M20.43.81.2PH190ISO 7046 / DIN 965
M2.50.454.71.5PH190ISO 7046 / DIN 965
M30.55.61.65PH190ISO 7046 / DIN 965
M3.50.66.51.93PH290ISO 7046 / DIN 965
M40.77.52.2PH290ISO 7046 / DIN 965
M50.89.22.5PH290ISO 7046 / DIN 965
M61.011.03.0PH390ISO 7046 / DIN 965
M81.2514.54.0PH390ISO 7046 / DIN 965
M101.518.05.0PH490ISO 7046 / DIN 965

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.

Request a Quotation

Specification
Business Information

Dimensions & Specifications (ISO 7046 / DIN 965)

SizePitch (mm)Head diameter dk (mm)Head height k (mm)Cross recessCountersink angle (deg)Reference standard
M1.60.353.00.96PH090ISO 7046 / DIN 965
M20.43.81.2PH190ISO 7046 / DIN 965
M2.50.454.71.5PH190ISO 7046 / DIN 965
M30.55.61.65PH190ISO 7046 / DIN 965
M3.50.66.51.93PH290ISO 7046 / DIN 965
M40.77.52.2PH290ISO 7046 / DIN 965
M50.89.22.5PH290ISO 7046 / DIN 965
M61.011.03.0PH390ISO 7046 / DIN 965
M81.2514.54.0PH390ISO 7046 / DIN 965
M101.518.05.0PH490ISO 7046 / DIN 965

Frequently Asked Questions

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 Countersunk Screws magnetic?

Grade 8.8 Steel Phillips Countersunk Screws are magnetic.

What corrosion resistance do Grade 8.8 Steel Phillips Countersunk Screws offer?

Grade 8.8 Steel Phillips Countersunk 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 Phillips Countersunk 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.

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.