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Introduction
Problem: Most elastomer coupling “failures” are installation failures—loose fits, wrong element hardness, and cold alignment that ignores hot growth.
Target (what good looks like)
Hub runout (OD TIR): ≤ 0.05 mm
Cold alignment targets (1,500–3,600 rpm): parallel offset ≤ 0.05–0.10 mm; angular ≤ 0.10 mm per 100 mm DBSE (bias for thermal growth)
Fits & fasteners: light interference per OEM; heat hubs ≤150 °C to mount; torque bolts with a calibrated wrench
Elastomer element: correct family + hardness (Shore A) for torsional/temperature duty; zero solvent-swell risk
E-dimension (gap): per OEM, uniform within 0.10 mm at 4 points
Defer to OEM if their numbers differ; otherwise, hold these minimums.