... application synchronously.1.Features Of BF1 Clamp Type Flexible coupling with curved Jaw: * Coupling assembled by pressing a polyurethane sleeve into hubs on ... user end. * D and L can be defined by user; Standard: Outside D=50mm, length=55mm. * Diameter of hollow shaft can ... be defined by user; Standard hole: Φ 4, Φ 5, Φ 6, Φ 6.35, Φ 8, Φ 10, Φ 12, Φ 15 ...