Pin attached to bottom of hole through long axis of machine bolt can be used to indicate correct bolt tension without torque meters or extensometers. Bolt elongates when tightened, but pin does not, and so appears to recede within bolt head. Steps cut in exposed end of pin would indicate acceptable range of tightness. Design would be particularly convenient in field locations without specialized instrumentation.
Bolt-tension indicator
NASA Tech Briefs ; 5 , 1
1980-08-01
Miscellaneous
No indication
English
FASTENERS - Direct Tension Indicator Bolt
Online Contents | 2008
Online Contents | 1995
NTRS | 1995
|Ultrasonic Correlation Bolt Tension Analyzer
British Library Conference Proceedings | 1995
Qualification Test. Differential-Thread Tension Bolt
NTIS | 1961
|