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IPC/WHMA-A-620 Crimp Pull-Force Checker
Class 3 minimum tensile (pull-off) force by wire size.
IPC/WHMA-A-620 Class 3 Minimum Pull-Off Force
55 N
Class 3 also requires the crimp to hold ≥90% of the wire’s ultimate tensile strength. Verify with crimp-height measurement (±0.05 mm window) and pull-force testing; crimp-force monitoring rejects any cycle deviating >5% from the golden sample.
| AWG | mm² | Min Pull-Force (N) |
|---|---|---|
| 20 | 0.50 | 55 |
| 16 | 1.00 | 100 |
| 12 | 2.50 | 160 |
Values per IPC/WHMA-A-620 Table 4-1 (intermediate gauges interpolated for planning). Always confirm against the current standard revision for your class.
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