What is a lock bolt
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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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What is a lock bolt
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
How Bolts Work

The idea is clamp

The method is torque

There’s the problem!

Torque doesn’t determine clamp

Distance does

The distance the bolt is stretched!


How bolts work1
How Bolts Work

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


How bolts work2
How Bolts Work

An uphill battle!

Threads are inclined planes

Wrapped around a cylinder

Twisting or ‘torquing’ pushes nut thread ‘up’ bolt thread


Installation sequence
Installation Sequence

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.

Figure 2


1-3/8” LOCK BOLTS & COLLARS

COLLAR

PINTAIL

LOCK BOLT WITH PINTAIL

PINTAIL-LESS LOCK BOLT


PINTAIL-LESS

TYPE

PINTAIL TYPE

1-3/8” INSTALLATION TOOLS



TENSION ONLY

TENSION

+

TORQUE

BOLT TENSION

BOLT ELONGATION

TORQUE INDUCED TENSION

VERSUS

TENSION INDUCED TENSION


BOLT PRELOAD VARIATION

BY TYPE AND METHOD

TYPEMETHODVARIATION

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%


INSTALLING A FLANGED COLLAR

ON A 10° BEVELED SURFACE


LOCK BOLT

NO GAP

COLLAR

STD. BOLT

GAP

NUT

LOCK BOLT

&

COLLAR

STANDARD

BOLT &

NUT


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