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Explain each of the following: (i) Countersunk (CSK) hole and (ii) Tapping size hole. - Leaving Cert Engineering - Question f - 2013
Question f
Explain each of the following: (i) Countersunk (CSK) hole and (ii) Tapping size hole.
Worked Solution & Example Answer:Explain each of the following: (i) Countersunk (CSK) hole and (ii) Tapping size hole. - Leaving Cert Engineering - Question f - 2013
Step 1
(i) Countersunk (CSK) hole
Answer
A countersunk hole is one that has an enlarged mouth designed to accommodate the head of countersunk screws or rivets. This type of hole allows the screw or rivet to sit flush with the surface of the material, providing a smooth finish and preventing the fastener from sticking out. The angle of the countersink is typically 82 degrees for wood screws, but it may vary for different applications.
Step 2
(ii) Tapping size hole
Answer
A tapping size hole is one that is drilled before cutting an internal thread. The diameter of this hole must be smaller than the tap to facilitate the depth required for the thread cutting process. By using a tapping size hole, it ensures proper threading, allowing the material to be fitted with screws or bolts securely. The actual size often depends on the type of thread and the material being used.