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.
Tensile Strength Min (ksi) Elong % Min RA % Min. Portland Bolt provides anchor bolts and nonstandard construction fasteners directly to contractors, steel fabricators, and other companies worldwide. Location & Hours.
F – axial bolt force or load (N, lb) torque reduction due to lubrication (%) Note that standard dry torques are normally calculated to produce a tensile stress – or axial force or clamp load – in the bolt that equals to 70% of minimum tensile strength or 75% of proof strength. Metric Bolts – Minimum Ultimate Tensile and Proof Loads
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Tensile strength and proof loads SAE bolts Sponsored Links Proof Load – is the maximum tensile force that can be applied to a bolt that will not result in plastic deformation
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Tensile Class 10.9 Class 12.9 Area Class 8.8 Class 9.8 Proof Load, Yield, & Tensile Chart GFC Engineering & Testing Center 1524 East 14 Mile Road Madison Heights, MI 48071 248-307-0567 www.genfast.com Proof Load, Yield & Tensile Strength Chart Metric
A grade 2 bolt made of low-carbon steel has a tensile strength of 64,000 pounds per square inch or less. Tensile strength is the amount of pull the bolt can withstand before breaking. A bolt head with three raised dashes in a radial pattern marks an SAE grade 5 bolt of tempered medium carbon steel with a tensile strength of at least 105,000 pounds per square inch.
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