Remington 489 User Manual download pdf (Page 12)

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 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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Remington 489 User Manual Page 12