Coupling Bore

Bores are cylindrical or conical holes in hubs of couplings with axes coincident with the rotational axis of the coupling. Nominal bore is a commonly used term to identify the basic bore size without tolerance. Rough bore is a centrally located axial hole produced with dimensions and tolerances in accordance with the practice of each manufacturer and is not appropriate for mounting. A spline bore has a series of parallel slots formed internal with the bore and mating with corresponding grooves cut in a shaft. A straight bore is a concentric axial cylindrical hole finished to tolerances appropriate for mounting. A tapered bore is a concentric axial conical hole finished to tolerances appropriate for mounting.