Remington 490 - Manual (Page 12)

12 101274
WHY A POWER FASTENER HOLDS
IN CONCRETE
The compression bond of the con-
crete to the power fastener ac-
counts for the majority of the hold-
ing power. The power fastener dis-
places 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 power 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-
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 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 3/16-3/8" steel.
NOTE: When fastening in steel be sure the point goes thru the
steel.
Why a Power
Fastener Holds