Why A Fastener Holds - Remington 490 Operating Instructions Manual

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 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-
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etration produces a bond on the
power fastener equal to the strength
of the concrete. As a general rule, penetration should be
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approximately 1" to 1 / " into the base concrete. Make sure the
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concrete is at least three times as thick as the intended fastener
penetration. NEVER have the power fastener point protrude
thru 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 simi-
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lar to the reaction when a power
fastener penetrates steel.
In steel, the point of the power
fastener must penetrate completely 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 thru the
steel.
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