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#18 8 STAINLESS STEEL VS 304 CODE#

Active Gearbox And Power-Train Components.Īny Nut Or Bolt Stamped With A 10:9 Or 12:9 Should Be Replaced With An Identically Rated (Or Higher) Component AND NOT An A2-70 Component.

Active Engine Componets (Con-Rods, Crank Shaft, Clutch, Transmission & Power Off-Takes).

Areas Of Direct Loading On The Steering Column And Linkages.

Areas Of Direct Loading On The Suspension.

Where Should I NOT Use A2-70 Stainless Steel Bolts ?Ī2-70 Should Not Be Used In Heavily Loaded Mechanical Or Structural Areas. I.e: Inlet & Exhaust Manifold Attachment, Ancilliary Attachment, Pipe Clamps, Flange Joining etc.Ī2-70 Can Also Be Used For Securing Access Panels, Cover Plates And Accessory Items To The Vehicle. Where Can I Use A2-70 Stainless Steel Bolts ?Ī2-70 Can Be Safely Used To Hold Car Body Panels And Bumpers Wing (Fender) Bolts, Hinge Bolts, Handles, Locks, Light Fittings Etc.Ī2-70 Can Be Safely Used On Non-Mechanically Loaded Engine Components Where A Simple Clamping Action Is Required (Subject To Torque Limitations). Nuts Will Also Have Markings On Them For Identification. Sometimes "Specials" Are Made By Turning Hex Bar, For Example. Any Bolt WITHOUT Markings Shall Be Considered To Be Of The Most Inferior Grade - Unless Its Composition Is Supported By Paperwork.

#18 8 STAINLESS STEEL VS 304 CODE#

If You Are Replacing A 4:6 Or A 5:8 Bolt Then There Are No Concerns.Īll Bolt Heads Will Have A Strength Code Or Reference Forged, Stamped Or Engraved On To Them For Identification. It Does Mean That You Have To Think A Little About Mechanical Loadings Before You Replace An 8:8 Steel Bolt With An A2-70 Stainless Steel Bolt.! Though It Is Weaker Than 8:8 Heat Treated Steels, Which Are Quite Commonplace. Deformation At This Point Usually Takes Dimensions Out Of Tolerance And Therefore Into The Realm Of Quality Assurance (Q.A.) Failure.Īs Can Be Seen : A2-70 Stainless Exceeds Ordinary Low Grade Steels For Strength. This Is Sometimes Referred To As The Elastic Limit. Tensile Strength Denotes The Load At Which The Material Breaks.Ġ.2% Yield Strength Denotes The Load That Will PERMANENTLY Deform / Stretch The Material By 0.2% Of Its Original Size.

How Do A2-70's Material Properties Compare To OEM Mild Steel Bolts ? Though Some Residual Magnetism Can Be Introduced When The Material Is Cold Worked.Ī2 / 304 Stainless Steel Is One Of The Most Highly Corrosion-Resistant Materials Available To The 50 & -80 Grades Are Also Available But Are Not All That Common.Ī2 / 304 Stainless Steel Is What Is Known As An Austenitic Stainless Steel : It Is (Mostly) Non-Magnetic. The -70 Representing The Tensile Strength Divided By 10. Article Updated : May 2020ĭIN/ISO A2 Stainless Steel Is A Corrosion Resistant Steel It Is Also Known As ASTM-304.Ī2 / ASTM-304 Is An 18/8 Stainless Steel : This Designates A Metallurgical Content Of 18% Chromium & 8% Nickel.Ī Bolt Marked A2-70 Is A 304 Stainless Steel Bolt With A 700 N/mm2 Tensile Strength (See Below Table). Stainless Steel & High Tensile Steel Bolts & Quality PartsĪrticle Created : Feb 2007.