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Due to many variables that affect the torque-tension relationship like human error, surface texture, and lubrication the only way to determine the correct torque is through experimentation under actual joint and assembly conditions.
TORQUE-TENSION RELATIONSHIP FOR A307A, GRADE 5, 8 & 9 BOLTS Locknut Size Threads per inch Steel Hex Locknut Steel Hex Flange Nut Grade C FNL Grade 9 Grade F Grade G Clamp Load (lbs.) Tightening Torque Clamp Load ... Tightening Torque K = 0.15 K = 0.17 K = 0.20 Coarse Thread Series
To calculate the torque required to tighten a bolt: Determine bolt size — find the diameter and thread pitch of the bolt. Look up torque specification — use a torque chart specific to the bolt's size and material.
Maximum recommended tightening torque for coarse threaded metric steel bolts: Metric Bolts - Typical Tightening Torques. Size. (mm) Max. Tightening Torque (Nm) Property Class. Grade 8.8.
This fastener bolt torque calculator will Estimate the unknown torque, diameter, axial force applied and coefficient of turning friction for the given conditions.
In figures this can be defined as the “torque rate”, which is the tightening angle necessary to achieve the recom-mended torque of the screw dimension and quality in ques-tion measured from the snug level – the point at which the components and the screw head become tight. The torque rate can vary considerably for the same diameter of screw.
Example - Required torque for tightening a Metric bolt to proof load. The proof load for a M30 metric bolt grad 8.8 is 337000 N. The torque required to achieve this tension with a dry bolt with 0% lubrication can be calculated as. T dry = (0.2) (337000 N) (30 mm) (10-3 m/mm) = 2022 (Nm)
Learn about all the variables at play and find out how to properly interpret the chart. A bolt torque chart provides the maximum tightening torque required for the most common bolt types.
Finding the maximum tightening torque for most common types of screws and bolts is an important first step in ensuring the required clamping force. Generating clamping force is the goal of tightening, and it is achieved so the assembled parts will function as intended.
When it comes to bolts, torque refers to the amount of force required to tighten the bolt to a specified level. The proper torque for a given bolt depends on a number of factors, including its size, material, and intended use.