Calculate the Tightening Torques for Grade 8 Fasteners

Calculating Tightening Torques for Grade 8 Fasteners

When fastening grade 8 bolts, it is crucial to apply the correct tightening torque to ensure the bolts are securely fastened. Let's calculate the tightening torques for two grade 8 fasteners: a ¼-20 fastener and a ¼-28 fastener.

Final answer:

The tightening torque for a ¼-20 fastener is 23.1 Nm, and for a ¼-28 fastener it is also 23.1 Nm. The units for torque are newton-meters (Nm). Assumptions made during the calculations include ideal conditions, such as no friction or other external forces.

Explanation:

The tightening torque for a ¼-20 fastener is calculated by multiplying the force applied to the wrench by the perpendicular distance from the center of the bolt. In this case, the force is 165 N and the distance is 0.140 m. The torque is therefore 23.1 Nm. The tightening torque for a ¼-28 fastener is calculated in the same way. Assuming the same force of 165 N and a different distance of 0.140 m, the torque is still 23.1 Nm. The torque units are newton-meters (Nm), which represents the amount of rotational force exerted on an object. Assumptions made during the calculations include the assumption of ideal conditions, such as no friction or other external forces affecting the torque calculation.