Or ping-test (not to be confused with IP pinging).
Probably as unusual as 'spechten'. The honor goes to Jack for knowing what it is. I was just curious if there was an alternative for 'acoustic tapping' that comes closer to 'spechten', which led me to 'pinging'.

"Experience helps. I recall reading a story of a shop that builds big aparatus and the shop personnel would tighten large fasteners by hand then check the "tightness" by striking the fastener with a steel hammer and listening to the pitch of the resulting ping. Too low a pitch, not tight enough. Too high a pitch, too tight. When the suits (design engineers) came to visit out came the torque wrenches. One day a suit showed up unexpectedly and saw how things were being done. He used a torque wrench to test all the fasteners that had been done with the ping test and found them all to be well within tolerance, most within only a couple of ft-lbs."
http://weldingweb.com/showthread.php?t=42393

Once the collar is swaged on, no additional tightening with a torque wrench is required. A simple sound test by pinging it with a hammer verifies the tightness of fit.
http://bit.ly/csFO5O (pdf, page 2, 12 & 16)