DANGER
• Poured Concrete
• Structural Steel
• Concrete Block and Horizontal
Joints in Brick or Masonry Walls
1. Always check the material being
fastened into for hardness before
attempting any fastening operation.
2. Using a fastener as a center punch,
strike the fastener against the work
surface using an average hammer
blow and check the results.
DANGER
SAFETY INSTRUCTIONS
Solid Concrete and
Precast Concrete
Solid or Hollow
Block
Center Punch Test Results
1. If the fastener point is flattened,
the material is too hard for a
powder actuated fastening.
2. If the fastener penetrates the material
easily, the material is too soft.
3. If the material cracks or shatters,
the material is too brittle.
4. If the fastener makes a small
indentation into the material, the
material is suitable for fastening.
SAFETY INSTRUCTIONS
Structural Steel
Horizontal Joints
only in Brick Walls
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