Re: Grade 12 bolts?

Re: Grade 12 bolts?
Re: Grade 12 bolts? -- John Tam	Post Reply	Top of thread	Forum

Posted by: Jim Disharoon

04/22/2003, 17:07:22

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"Grade 12" is not a valid material condition or 'call out' to SAE, ASTM, or ASME specifications.Grade 8 is the highest standard 'western' material condition: ferrous alloy heat treated."Lamalloy L-9" is a proprietary alloy steel material heat treated that is somewhat 'stronger' than Grade 8.( 160m psi tensile vs 180m psi tensile)ISO metric materials are Class 12.9 (applies to hex socket head cap screws, equivalant to ANSI 'heat treated alloy steel' Rc38-45); Class 10.9 (applies to hex head cap screws, equivalant to Grade 8); Class 8.8 (applies to hex head cap screws, equivalant to Grade 5)For tensile strengths over 180m psi uts, special manufacture in a variety of available materials and conditions are the norm.Jim DisharoonTranSpec Fasteners, Inc.

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