Isa screw is a genuine BMW part with catalog number 46518531478 (BMW notation: 46 51 8 531 478). It is listed in the Motorcycle Parts & Gear category of our catalog. Weight: 0.026 kg. Price: 7,87 € excl. VAT. We source every part to order — that usually takes 1–2 weeks — and every order comes with a VAT invoice.