The tensile strength of a grade 8 bolt is 150,000 pounds per square inch. Tensile strength is the maximum load in tension (stretching) that a part can carry without breaking. In addition to tensile strength, other mechanical factors in a connection should be considered, including yield strength and proper assembly of the parts.
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The two figures indicate the tensile and yield strengths of the bolt or screw. In the case of a 8.8 grade bolt the first figure signifies that the Tensile Strength is at least 800MPa. The second figure signifies that the fastener will begin to yield at 80% of the Ultimate Tensile Strength, i.e. at least 640MPa.
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The most commonly used measure of fastener strength is the proof load, also referred to as the nominal tensile strength, which is a function of the cross sectional diameter of the bolt and the nominal yield stress of the material.
ASTM A193 Grade B7 bolts and threaded studs are manufactured from a chromium-molybdenum steel and are quenched and tempered (heat treated) to develop the desired mechanical properties (strength). Grade B7 is the most common grade of A193 bolts used in construction. B7 threaded studs and short, headed bolts are readily available in the marketplace.
Tensile Strength The most widely associated mechanical property associated with standard threaded fasteners is tensile strength. Tensile strength is the maximum tension-applied load the fastener can support prior to or coinciding with its fracture (see figure 1). Tensile load a fastener can withstand is determined by the formula
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/mm 2 = 145 pounds/inch 2
Formerly under the jurisdiction of Committee F16 on Fasteners, this specification was withdrawn in May 2016 and replaced by Specification F3125/F3125M for High Strength Structural Bolts, Steel and Alloy Steel, Heat Treated, 120 ksi (830 MPa) and 150 ksi (1040 mpa) minimum tensile Strength, Inch and Metric Dimensions.
It should be noted that grade 8 nuts are designed to mate with grade 8 cap screws/bolts. Tensile strength of grade 8 bolts and gr 8 bolts proof load. As complex.