DeWalt P35s Mode D'emploi page 4

360˚ around the shank of the fastener. Since steel is an elastic material, it presses back
against the shank of the fastener to hold it in place. As the diameter of the fastener
shank is increased, the load capacity obtained will generally increase provided the steel
thickness is sufficient to accept the fastener. To further increase fastener performance
in steel, some fasteners have a knurled shank which allows the steel to form a key lock
into the grooves to provide higher capacities than those obtained with a smooth shank.
For optimum performance, the fastener point should completely penetrate the steel.
Normally, a minimum of 1/4" (6.35mm) is allowed for the point length. An increase
in performance can be expected until the fastener no longer completely penetrates
through the steel. At this point, the elastic properties of the steel cause a compression
force to be developed at an angle against the fastener point which reduces load
capacity. In thicker steel base materials, adequate load capacities may be obtained for
applications in which the point of the fastener does not fully penetrate the steel. Job
site performance tests are recommended.
as these procedures may have caused local hardening of the steel. Over driving of the
fastener should be avoided as the rebound created may reduce the load capacity or
cause damage to the fastener. When fastening into unsupported long steel members,
it may be necessary to provide support in the area of the fastening to prevent spring
action which can cause inconsistent penetration and a reduction in load capacity.
SUITABLE BASE MATERIAL
While powder actuated fasteners can be used successfully in concrete, certain masonry
materials, and A 36 steel, some materials are completely unsuitable. Fasteners should
never be fired into hard or brittle materials such as cast iron, tile, glass, or rock. These
materials can shatter easily resulting in a potential safety hazard. In addition, soft base
materials such as wallboard, plaster, or wood are not appropriate as the fastener could
pass completely through these materials. The user should never guess when fastening
into any base material. Failure to follow the recommended installation and safety
guidelines can result in severe injury or death to the tool operator and/or bystanders.
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Point Flattens
CENTER PUNCH TEST
A center punch test should always be performed to determine the suitability of the base
material for a powder actuated fastening. This test is relatively simple and can help to
insure a safe, successful fastening. Be sure to wear safety glasses, goggles or a face
shield when performing this test. To begin, select the fastener to be used for the job.
No Indent
Then, place the point of the fastener against the proposed base material. Strike the
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fastener with a single hammer blow, then examine the point. If the point of the fastener
Surface Shatters
is not blunted and the base material has a clear point indentation, it is acceptable to
proceed with the first test installation.
the center punch test:
1. The fastener point has been blunted. This indicates that the base material is too hard.
Material Cracks
2. The base material cracks or shatters. This indicates that the base material is too brittle.
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3. When using an average hammer blow, the fastener penetrates the base material
FASTENER INSTALLATION REQUIREMENTS
Fastener Sinks in with
Average Hammer Blow It is important to understand the required minimum base material thickness
requirements along with the minimum spacing and edge distance requirements.
Failure to follow these requirements can result in an unsuccessful fastening and create
a safety hazard.
BASE MATERIAL THICKNESS
P35s
When a powder actuated fastener is driven into steel, it displaces the steel laterally
Fasteners should not be used in areas that have been welded or cut with a torch
Use of a powder actuated system is not recommended if the following occurs during
easily. This indicates that the base material is too soft.
EN
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