Compare nails and screws for wood joints in terms of withdrawal resistance and load scenarios?

Compare nails and screws for wood joints in terms of withdrawal resistance and load scenarios?

• A. Nails are quick and cheap but offer lower withdrawal resistance.
• B. Screws provide high clamp force and withdrawal resistance; nails for temporary or light loads.
• C. Nails and screws are identical.
• D. Screws with glue cannot be used for structural joints.

Answer: (A)

Withdrawal resistance is about how well a fastener resists being pulled out along the grain of the wood. Nails have a smooth shank and no threads, so they grip mainly through friction and the wood’s shear around the shank. That makes their withdrawal resistance relatively low. They are quick to install and cheap, which is why they’re well suited to temporary or light-load joints where you don’t expect strong pull-out forces. Screws, on the other hand, have threads that bite into the wood, creating a mechanical interlock that significantly increases withdrawal resistance and also allows a strong clamping force when the joint is tightened. This is why screws are preferred for permanent or heavier-load joints that might experience pulling forces. So the statement nails are quick and cheap but have lower withdrawal resistance captures the key trade-off: you trade hold-force for speed and cost. The other choices either introduce extra details that aren’t as directly relevant to withdrawal resistance or include incorrect notions about joint use.

Withdrawal resistance is about how well a fastener resists being pulled out along the grain of the wood. Nails have a smooth shank and no threads, so they grip mainly through friction and the wood’s shear around the shank. That makes their withdrawal resistance relatively low. They are quick to install and cheap, which is why they’re well suited to temporary or light-load joints where you don’t expect strong pull-out forces. Screws, on the other hand, have threads that bite into the wood, creating a mechanical interlock that significantly increases withdrawal resistance and also allows a strong clamping force when the joint is tightened. This is why screws are preferred for permanent or heavier-load joints that might experience pulling forces. So the statement nails are quick and cheap but have lower withdrawal resistance captures the key trade-off: you trade hold-force for speed and cost. The other choices either introduce extra details that aren’t as directly relevant to withdrawal resistance or include incorrect notions about joint use.