Here you are Larry just what you asked for. Bolt Grade Markings and Strength Chart
Table with 6 columns and 20 rows Head Marking Grade and Material Nominal Size Range (inches) Mechanical Properties Proof Load (psi) Min. Yield Strength (psi) Min. Tensile Strength (psi) US Bolts No Markings Grade 2 Low or medium carbon steel 1/4 thru 3/4 55,000 57,000 74,000 Over 3/4 thru 1-1/2 33,000 36,000 60,000 3 Radial Lines Grade 5 Medium Carbon Steel, Quenched and Tempered 1/4 thru 1 85,000 92,000 120,000 Over 1 thru 1-1/2 74,000 81,000 105,000 6 Radial Lines Grade 8 Medium Carbon Alloy Steel, Quenched and Tempered 1/4 thru 1-1/2 120,000 130,000 150,000 Stainless markings vary. Most stainless is non-magnetic 18-8 Stainless Steel alloy with 17-19% Chromium and 8-13% Nickel 1/4 thru 5/8 40,000 Min. 80,000 - 90,000 Typical 100,000 - 125,000 Typical 3/4 thru 1 40,000 Min. 45,000 - 70,000 Typical 100,000 Typical Above 1 80,000 - 90,000 Typical Head Marking Class and Material Nominal Size Range (mm) Mechanical Properties Proof Load (MPa) Min. Yield Strength (MPa) Min. Tensile Strength (MPa) Metric bolts 8.8 Class 8.8 Medium Carbon Steel, Quenched and Tempered All Sizes below 16mm 580 640 800 16mm - 72mm 600 660 830 10.9 Class 10.9 Alloy Steel, Quenched and Tempered 5mm - 100mm 830 940 1040 12.9 Class 12.9 Alloy Steel, Quenched and Tempered 1.6mm - 100mm 970 1100 1220 Stainless markings vary. Most stainless is non-magnetic. Usualy stamped A-2 A-2 Stainless Steel alloy with 17- 19% Chromium and 8-13% Nickel All Sizes thru 20mm 210 Min. 450 Typical 500 Min. 700 Typical Tensile Strength: The maximum load in tension (pulling apart) which a material can withstand before breaking or fracturing. Yield Strength: The maximum load at which a material exhibits a specific permanent deformation Proof Load: An axial tensile load which the product must withstand without evidence of any permanent set. 1MPa = 1N/mm2 = 0.2248 pounds/mm2 ********************************************************************** This message and its attachments may contain legally privileged or confidential information. If you are not the intended recipient, you must not disclose or use the information contained in it. If you have received this e-mail in error, please notify the sender immediately by return e-mail and delete the e-mail. Any content of this message and its attachments which does not relate to the official business of Eraring Energy must be taken not to have been sent or endorsed by Eraring Energy. No warranty is made that the e-mail or attachment(s) are free from computer virus or other defect. ********************************************************************** [Non-text portions of this message have been removed]
