Pump Drive Components Standard Dentex® Coupling B4R and B3R H* is the minimum dimension required for the disengaging of the coupling. Finish bores according to ISO-standard H7, keyway according to DIN 6885, sheet 1 (JS9). Weight and moment of inertia values refer to maximum diameter d without keyway. B3R with inner and outer circlips B4R with dust seal and circlips H* is the minimum dimension required for the disengaging of the coupling. Finish bores according to ISO-standard H7, keyway according to DIN 6885, sheet 1 (JS9). Weight and moment of inertia values refer to maximum diameter d without keyway. Steel Nylon Steel Nylon 29 #DriveLineHarmony www.jbj.co.uk/couplings.html
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