Why a Power
Fastener Holds
WHY A POWER FASTENER HOLDS IN CONCRETE
The compression bond of the con- crete to the power fastener accounts for the majority of the holding power. The power fastener displaces the con- crete which tries to return to its original form causing a squeezing effect.
Maximum holding power is achieved when the depth of penetration pro- duces a bond on the power fastener equal to the strength of the concrete.
As a general rule, penetration should be approximately 1" to 1 1/4" into the base concrete. Make sure the concrete is at least three times as thick as the intended power fastener penetration. NEVER have the power fastener point protrude thru the concrete.
NOTE: Concrete needs to cure for 28 days before maxi- mum fastening holding power will be achieved.
WHY A POWER FASTENER HOLDS IN STEEL
Holding power in steel depends on the elasticity of the steel. The steel pushes back on the shank of the power fastener.
Drop a marble into water; the water parts, the marble continues down, the water closes back. This is similar
to the reaction when a power fas- tener penetrates steel.
In steel, the point of the power fastener must penetrate com- pletely through for highest holding power. If the power fastener does not penetrate, the spring action of the steel pushes back on the point and tends to force the power fastener out.
Recommended applications are between
NOTE: When fastening in steel be sure the point goes thru the steel.
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