Which letter represents the gear tooth working depth of the gear set illustrated? Refer to Illustration GS-0111

Correct Answer: Option A — A

Gear tooth geometry defines the operational efficiency of mechanical drives. Illustration GS-0111 identifies 'A' as the working depth, representing the distance the teeth of mating gears penetrate each other. This dimension is fundamental for ensuring correct backlash and load distribution across the gear teeth during operation under marine load conditions.