Torque testing 'super-glued' nuts and bolts

Lloyd Instruments has developed a steel jig for testing the torque of 'super-glued' nuts and bolts clamps the nut/bolt assembly while a lever arm is driven down to apply torque to the nut.

A steel jig for testing the torque of 'super-glued' nuts and bolts clamps the nut/bolt assembly while a lever arm is driven down to apply torque to the nut.

A steel jig for testing the torque of 'super-glued' nuts and bolts is the latest adhesives testing system to be introduced by Lloyd Instruments.

The test jigs can be used with Lloyd Instruments LRX or LRXPlus universal materials testing machines.

The jig clamps the glued nut/bolt into position while a lever arm is driven down, applying torque force to the nut.

Nuts are super-glued onto bolts for use in environments where there is vibration.

Accurate measurement of the torque is extremely important to ensure that the assembly can withstand specific levels of vibration.

The jig comprises a slide block into which the sample bolt head is inserted.

A swivel plate is then moved across and the sample secured into position by an adjusting screw.

The slide block itself is then bolted to the testing instrument baseplate.

A spanner lever, featuring a special socket mechanism to engage the nut, is located into the jig at an angle of approximately 45 deg.

The test can be carried out completely automatically using Lloyd Instruments' NEXYGEN MT materials test and analysis software.

A dome-ended probe fitted to the crosshead of the test machine is driven down onto the spanner lever to apply force to the superglued bolt assembly.

Failure in the adhesive is indicated when the nut moves freely on the bolt thread.

This is measured by NEXYGEN software as a drop in force applied to the nut.

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