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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.
A chart to identify bolt grades using bolt grade markings; also provides a strength chart for common grade bolts.
SAE steel bolts - grades ranging grade 1 to 8.2 - proof and tensile strength. Endurance limits and fatigue stress for steels. Threaded bolts tensile stress area. Hex Bolt, Lag Bolt, Square Bolt and Heavy Hex Bolt. Recommended bolt torques. ANSI/ASME B18.2.3M Dimensions of Hex Bolts - Metric units.
Grade 8 bolts are made of medium-strength carbon or alloy steel and can be finished in a variety of coatings and platings for added corrosion resistance and lubricity. You can identify a Grade 8 bolt by looking at its head markings. An SAE J429 Grade 8 bolt’s head marking will show six radial lines like this:
strength requirements (a) A) Proof loads and tensile strengths are computed by multiplying the proof load stresses and tensile strength stresses given in Table 1 by the stress area of the thread.
Bolt Grade Markings and Strength Chart for US Bolts. Head Marking, Grade, Material, Nominal Size Range (inches) and Bolt Strength.
Proof Load Tensile Strength for Grade 2, 5 & 8 Coarse Thread Series – UNRC Nominal Diameter of Products & Threads per inch Stress Area (sq. in.) Grade 2 Grade 5 Grade 8 Proof Load (lbs.) Tensile Strength Min. (lbs.) Proof Load (lbs.) Tensile Strength Min. (lbs.) Proof Load (lbs.) Tensile Strength Min. (lbs.)
• Stamping of F1554 and A307 Grade C bolts is a supplemental requirement while color coding is required. • Although markings are shown on hex heads, grade markings apply equally to products with other head configurations. • All Grade BD products shall be marked “BD”. In addition to the “BD” marking, the product may be
The torque values can only be achieved if nut (or tapped hole) has a proof load greater than or equal to the bolt's minimum ultimate tensile strength. Clamp load calculated as 75% of the proof load when specified by the standard. ASTM A307 utilized 75% of 36,000 PSI. Torque values for 1/4 and 5/16-in series are in inch-pounds.
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.