What is a lock bolt ?. No threads but lock grooves No nut but collar No torque but clamp No friction but direct tension. Form. Pin. Collar. Break Groove. Pull Grooves. Lock Grooves. How Bolts Work. The idea is clamp The method is torque There’s the problem!
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The idea is clamp
The method is torque
There’s the problem!
Torque doesn’t determine clamp
The distance the bolt is stretched!
Torquing s - t - r - e - t - c - h - e - s the bolt
The bolt acts like a spring
The spring holds clamp in the joint
Clamp should exceed service loads of the fastener
An uphill battle!
Threads are inclined planes
Wrapped around a cylinder
Twisting or ‘torquing’ pushes nut thread ‘up’ bolt thread
For 1/2" through 1-3/8" diameter lock bolts, the installation tool is powered by hydraulics. Low voltage electricity from the installation tool is used to actuate hydraulic valves for pull (swage) and return (eject) cycles. An installation sequence is shown in Figure 2. Installation tools are shown in Figure 3.
LOCK BOLT WITH PINTAIL
PINTAIL-LESS LOCK BOLT
1-3/8” INSTALLATION TOOLS
TORQUE INDUCED TENSION
TENSION INDUCED TENSION
BY TYPE AND METHOD
TORQUE IMPACT WRENCH ± 45%
TORQUE FEEL ± 35%
TORQUE TORQUE WRENCH ± 30%
TENSION TURN OF NUT ± 15%
TENSION LOAD INDICATING WASHER ± 10%
TENSION ELONGATION MEASUREMENT ± 5%
TENSION SWAGED LOCK BOLT ± 5%
ON A 10° BEVELED SURFACE