These charts 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.

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.

Metric Bolt Strength: Minimum, Ultimate Tensile & Proof Loads - Metric Minimum ultimate tensile and proof loads for metric bolts with coarse or fine threads.

Additonal information on bolts is located at the bottom of the webpage. Note: Some bolts share identical head identification and have significantly different strengths.

Most industrial fasteners are covered by two basic standards: one for materials and properties; the other, for dimensions and tolerances.

ASTM F1852 provides strength comparable to that of ASTM A325 bolts, while ASTM F2280 provides strength comparable to that of ASTM A490 bolts. The chart below summarizes the applicable ASTM …

This chart detailed bolt strength requirements by grade. All specifications below are per ASTM. For more information on fasteners, visit our Fastener Learning Hub.

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.

LIABILITY – Information in this document pertaining to strength or proper working load or performance of materials, tools and equipment has been compiled by the manufacturer for the buyer’s convenience.

Shear strengths of bolts by diameter Bolt Safe Working Loads (lbs) Safe tensile load at 6,000 psi load; safe shear strength at 7500 psi load) ... Bolt Tensile Strength (Breaking Strength - pounds)