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This chart helps to identify the grades of bolts using the identification marks on the bolt's head along with the strength and hardness of common grade bolts. Please note the bolt heads may also include the manufacturer's identification stamp, especially with high strength bolts.
Compatible denotes commercially available nut having suitable mechanical properties and dimensional configuration or style which will make it possible to obtain the desired bolt load. Higher strength nuts or nuts of equal strength may be a suitable substitute provided bolt standard allows.
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.
Printable Chart for easy comparison between Metric Bolt Classes and US grades equivalents. Most common stainless. Similar to 304 / 18-8. Chart for easy comparison of US / Metric screws and bolts. It is always a bit unusual to compare them as they use different measurement systems (PSI vs. Mpa).
Tensile Strength = 150,000 lbs/in² Designated by 6 radial lines on the head (refer AS 2465) Grade 9 Tensile Strength = 180,000 lbs/in² Designated by 9 radial lines on the head (refer AS 2465) Property Class 8.8 Tensile Strength = 800 MpaOn metric high tensile bolts the relevant property class is indicated on the head (refer AS1110). Class 10.9
Bolt Grade Markings and Strength Chart Mechanical Properties Head Marking No Markings 3 Radial Lines 6 Radial Lines Stainless markings vary. Most stainless s non- magnetic Head Marking ... (mm) Al Sizes below 16mm 16mm - 72mm Proof Load 55,000 33,000 85,000 74,000 120,000 Min. Yield Strength (psi) 57,000 36,000 92,000 81,000
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.
