Which term is defined as stretching/wear of chain?

• A. Chain Elongation
• B. Alignment
• C. Pillow Block Bearing
• D. Pneumatics

Answer: (A)

Chain elongation describes stretching and wear of a chain. When a chain is run under load, the pins and bushings wear and the metal can deform slightly, causing the overall length (pitch) of the chain to increase. This elongation means the chain doesn’t fit the sprockets as tightly as designed, leading to slower engagement, increased slack, potential skipping, and accelerated wear on both the chain and sprockets. It’s a measurable change from the original length, often expressed as a percentage of elongation, and once it exceeds spec, the chain should be replaced to prevent more serious drivetrain problems.

Alignment, pillow block bearing, and pneumatics describe other concepts: alignment is about positioning components so they run true and in proper relation to each other; a pillow block bearing is a housing that supports a rotating shaft; pneumatics involves air-powered systems and actuators.