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Why A Power Fastener Holds
WHY A POWER FASTENER HOLDS
IN CONCRETE
The compression bond of the concrete to the power fastener
accounts for the majority of the holding power. The fastener
displaces the concrete which tries to return to its original form
causing a squeezing effect.
Maximum holding power is achieved when the depth of pen-
etration produces 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
fastener penetration. NEVER have the power fastener point
protrude through the concrete.
NOTE: Concrete needs to cure for 28 days before maximum
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 fastener penetrates steel.
In steel, the point of the power fastener must penetrate com-
pletely through for highest holding power. If the fastener does
not penetrate, the spring action of the steel pushes back on the
point and tends to force the fastener out.
Recommended applications are between 3/16-3/8" steel.
NOTE: When fastening in steel be sure the point goes through
the steel.
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