Tapered, Precision Fit
Precision machining of the tapered bore in the hub of the “QD” rim and the tapered mating surface of the bushing ensures a snug, precision fit between rim and bushing. Tightening the cap screws draws the sheave up tight on the bushing.
Full - Not Partial Split
This feature, together with the tapered, precision fit of rim and bushing, enables the “QD” Bushing to compress evenly through the overall bushing length, thus gripping the shaft with tremendous pressure, the equivalent of a press fit on the shaft. And the full split makes it just as easy to install “QD” Bushings on all standard size shafts as it is to install them on shafts, which may be slightly oversized or slightly undersized.
Easy to Install, Easy to Remove
To install “QD” Bushings, the cap screws are used as pull-wrench only – no additional leverage is necessary. To remove “QD” Sheaves, the cap screws are taken out and used as jack screws. A few quick turns on each screw, and the tight grip of the bushing on the shaft is easily broken.
Set Screw Over the Key
Once the correct position of the “QD” Bushing on the shaft is determined, tightening the set screw in the bushing flange down on the key will hold the bushing in this position while the pull-up bolts are tightened. This set screw holds the key in place on the shaft during drive operation - an especially desirable feature on drives that have vertical shafts facing down. Available on all “QD” bushings except W and S.
Fully Interchangeable With Other “QD” Bushings
“QD” Bushings conform to standardized “QD” dimensions and sheave types. Because of this feature, any “QD” Stock Bushing may be interchanged with the same size bushing that other “QD” manufacturers produce.