- Classical QD High-quality cast iron heavy duty pulleys for classical (A, B, C, D) V-Belts. Standardized QD bushings - Power-Wedge QD High-capacity cast iron pulleys for use with narrow (3V, 5V, 8V) V-Belts. Standardized QD bushings. QD is a registered trademark - Emerson Electric o Neoprene is a registered trademark - DuPont Dow Corp. - QD Bushings Standardized for interchangeability. Tapered and fully split through bore length for equivalent of interference fit.
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