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These couplings are radially displaceable, enabling prealignment of
driving and driven shafts prior to assembly. A metallic flexible disc
coupling is fitted to both ends. They give starting torque down to 120%
of nominal torque. The HF is a standard coupling; HFD comes with a
delayfil chamber and HF-DX with extended delayfil chamber. Standard
fusible plug blow off temperature is 130 degrees C.
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