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What is anti seize?
Anti-seize is a lubricant designed to limit the friction on fasteners during installation and reduce the chance of thread galling.
What is threadlocker?
Threadlocker is a paste that is applied to fastener threading before installation. Once installed the paste cures and holds the threads in place.
What is tolerance?
Tolerance is the accepted amount of variation from fastener to fastener that is allowed while still being considered the same size.
What is shear strength?
Shear strength is the amount of force a fastener can handle from its side without shearing.
What is tensile strength?
Tensile strenght is the maximum load in tension a fastener can handle before or at breaking point.
What is tensile load?
Tensile load is maximum load that can be applied to a fastener before its breaking point. This force is tested by the installation materials pushing against the head and nut of the bolt.
What is elongation?
Elongation is the stretching of a fastener from head to tip which causes the bolt to warp. It is caused by too much torque applied to a bolt or too much pressure being applied.
What is torsional strength?
Torsional strength is the amount of torque a fastener can handle before it breaks.
What is yield strength?
Yield strength is the amount of force that can be applied to a fastener before it "yields" and begins to warp.
What is hardness?
Hardness refers to a materials ability to cause damage to another material without causing damage to itself. Example: It is possible to scratch your phone screen with your keys without damaging the keys. This is because your keys are harder than the glass screen.
What is fatigue strength?
When a fastener is exposed to multiple elements (heat, removal and reapplying pressure and other stress factors), a fastener will change shape and return to its original form. Fatigue strength refers to the maximum amount of stress it can handle for a number of cycles and still return to normal. Once a fastener exceeds its fatigue strength it is very likely to develop faults.
What is galling?
Galling is the fusion that occurs when metal is moving very fast against metal with friction and pressure. It causes the two pieces to weld together on the surface level which is known as galling. Stainless steel, aluminum, titanium and hot dip galvanized fasteners are all prone to galling.
How can I prevent galling?
Galling can be prevented by making sure an quality anti-seize lubrication is applied to the threads of a fastener prior to installation.
What is corrosion?
Corrosion is the breakdown of a material due to contact with either a corrosive chemical or another material it reacts with. The latter is known as galvanic corrosion.
What is galvanic corrosion?
Galvanic corrosion is the transfer of electrons from one material to the other which compromises the integrity of that material.
What is prevailing torque?
Prevailing torque is the measure pressure it takes to cause frictional resistance to rotation.
What is installation torque?
Installation torque is the highest torque needed to install a fastener before axial loading occurs.
What is breakaway torque?
The amount of torque required to start rotation between a fastener and its locking mechanism (such as a nut) when no axial load is present.
What is breakloose torque?
Breakloose torque is the initial amount of torque required to begin decompressing a fastener assembly
What is seating torque?
Seating torque is the torque that needs to be applied to create a compressive load under the head of the fastener.
What is an axial load?
An axail load is the amount of pulling or stretching force placed on the axis of rotation. One way to think of axial load is when attatching two pieces of wood together with a nut and bolt. Once the nut begins to firmly press against the wood, it begings to exert compression force. As the two pieces of wood struggle to maintain their original shape, force is exerted against the nut and bolt head by the wood. The force exerted against the nut and bolt are the axial load. This load can be increased by adding additional weight to the wood itself.
For more detailed information please visit our Fasteners 101 Resource Pages
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