Remington 489 - Manual (Page 12)

Why A Power Fastener Holds
10
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 penetration 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 pro-
trude 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
similar 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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