First screw the Rivet Nuts into the threaded mandrel and apply the specified guaranteed load according to Table 1, and keep it for 15s. The Rivet Nuts should not trip or break. After the load is removed, the Rivet Nuts should be unscrewed by hand, or can be unscrewed by hand after lightening the Rivet Nuts. During the test, the moving speed of the chuck should not exceed 3mm/min. During the test, if the threaded mandrel is damaged, the test is discarded. The hardness of the threaded mandrel should be ≥45HRC. The thread tolerance is 5h6g, but the diameter should be controlled within a quarter of the 6g tolerance zone close to the lower limit.
Next, screw the Rivet Nuts into the threaded mandrel and apply a load until it breaks. The break should not occur at the junction of the head and the cylindrical part; the load value should meet the requirements of Table 1. During the experiment, the moving speed of the chuck should not exceed 3mm/min. During the test, if the threaded mandrel is damaged, the test is invalidated.
The fourth step is to rivet the Rivet Nuts on the riveting mounting plate, and screw in the test bolts without any lubrication. Apply torque until Rivet Nuts break or the thread trips. The torque measurement error of the torque testing machine or tool used in the test should not be more than 2% of the maximum rated torque. The thickness and hole of the riveting plate shall be in accordance with the maximum riveting thickness h and d0 or s0 recommended by the product standard.
Finally, the Rivet Nuts are riveted on the riveting mounting plate, and the test bolts are screwed in without any lubrication. Apply torque until relative rotation between Rivet Nuts and riveting plate occurs. The torque measurement error of the torsion testing machine or tool used in the test should not be greater than the maximum quota h and d0. Its hardness should be ≥45HRC. The test bolt adopts GB/T5782, 8.8 grade hexagon head bolt.
