What is the term for a raised knob on the end of a moving blade that is peened over shrouding to retain the blade?

What is the term for a raised knob on the end of a moving blade that is peened over shrouding to retain the blade?

• A. Dowel
• B. Boss
• C. Tenon
• D. Pin

Answer: (C)

The key idea is a projecting male feature that fits into a matching recess and is secured by peening to lock the blade in place. That projecting end is a tenon. It acts like a tongue that slides into a mortise or socket in the shroud, and then peening the end traps the blade so it can’t back out during operation. Dowel is just a round pin used mainly for alignment, not a peened retention feature. A boss is a raised protrusion used for mounting or locating, not specifically a blade-retention method. A pin would be a through-fastener or a separate fastener, not a knurled, peened end on the blade itself.

The key idea is a projecting male feature that fits into a matching recess and is secured by peening to lock the blade in place. That projecting end is a tenon. It acts like a tongue that slides into a mortise or socket in the shroud, and then peening the end traps the blade so it can’t back out during operation.

Dowel is just a round pin used mainly for alignment, not a peened retention feature. A boss is a raised protrusion used for mounting or locating, not specifically a blade-retention method. A pin would be a through-fastener or a separate fastener, not a knurled, peened end on the blade itself.