Measure Roller Chain Elongation & Determine Replacement Need
Prevent costly failures by measuring chain wear before it damages sprockets
| Nominal Length: | 7.500" |
| Measured Length: | 7.500" |
| Difference: | 0.000" |
| Per-Pitch Elongation: | 0.000" |
| Status | Elongation | Action |
|---|---|---|
| Good | 0 - 1.5% | Continue monitoring |
| Warning | 1.5 - 2% | Plan replacement |
| Critical | > 2% (3% max) | Replace immediately |
Chain is in good condition. Continue regular inspections and lubrication.
Chains don't actually stretch - the metal doesn't elongate. Wear occurs at the pins and bushings where the chain articulates. As these surfaces wear, small gaps accumulate across many links, making the chain appear longer.
Beyond 3% elongation, the chain no longer properly engages sprocket teeth. This causes the chain to "ride high" on the teeth, accelerating sprocket wear and risking chain skip or failure.
A worn chain damages sprocket teeth. When replacing a worn chain, always inspect sprockets. Hooked or worn teeth will quickly destroy a new chain. Replace both together for best results.
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