A selection of belt drive couple nut for frame builders. Manufactured in Taiwan by Allotec, a foundry which makes steel frame parts using the lost wax investment casting method. Please see diagram and details spec in the manufacturer's catalog.
E38-1/E38-2 A: Ø16mm/Ø19mm M:M5X0.8 WT:43g/63g
E49 A:19mm marerial: CR-MO WT: 78g
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