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Difficulty: MediumNails and Brads

When installing interior trim and moulding, carpenters commonly use finish nails instead of common framing nails. What is the primary purpose of the small, cupped indentation located on the head of a finish nail?

  1. A
    To provide a wide bearing surface that prevents the head from pulling through soft wood
  2. B
    To indicate the nail's penny size and metallurgical hardness rating for building code inspection
  3. To receive and align the tip of a nail set so the fastener can be driven below the wood surface without slippingAnswer
  4. D
    To allow the nail head to remain exposed so it can be gripped easily by a claw hammer during disassembly

Answer

The cupped indentation receives and aligns the tip of a nail set so the fastener can be driven below the wood surface without slipping.
A finish nail features a small, barrel-shaped head with a concave (cupped) indentation on top. This depression allows the pointed tip of a nail set punch to sit securely without sliding off and marring the surrounding wood. By striking the nail set with a hammer, the carpenter drives the nail head slightly below the wood surface (countersinking) so the hole can be concealed with wood putty and painted or stained.

Step-by-Step Solution

1
Identify the distinguishing physical features and purpose of finish nails in carpentry.
Finish nails possess a slender shank and a small, barrel-shaped head with a concave indentation on top.
They are specifically designed for interior woodworking where visible fastener heads would detract from appearance.
2
Determine the function of the cupped head indentation during installation.
The concave depression firmly seats the tapered end of a nail set punch.
Using a nail set allows the carpenter to drive the nail head 1/161/16 to 1/8 inch1/8\text{ inch} below the surface without denting the finished moulding with a hammer face.

Key Concept

Finish nail anatomy and the use of a nail set for countersinking trim fasteners
Estimated Time:45s
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Topics

Nails and Brads

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