www.jbj.co.uk/couplings.html#flender 16 #DriveLineHarmony Clamping Hubs, Type 124 & 125 Torsionally Rigid All-Steel Couplings N-ARPEX clamping hubs transmit torque with the aid of a flexible press fit. By pulling the clamping ring on by means of the tightening screws the necessary surface pressure is applied in the "shaft/hub" contact area.After the tightening operation the clamping ring lies up against the clamping hub. The transmissible torques allow for the maximum fitting clearance for a quality IT6 bore and shaft and maximum surface roughness. For other shaft tolerances reduced torques or other bore tolerances must be used. The surface roughness of the shaft should be ≤ Ra = 1.6 μm. Transmissible torque Function Fitting clearance and surface roughness The clamping connections are designed to enable the specifiedmaximum torques to be transmitted. Thesemaximum torques must not be exceeded, even in the case of overload. The fit pairing G6/h6 should be used wherever possible. Divergent shaft tolerances must be specified when ordering. Type 124 and 125 standard clamping hubs can be combined with any spacer of theARN-6 series. It should be noted that the clamping hub can be used only as an "N hub" (hub core outside). The product code for the specificationmust end in "-Z" and include the code "Y26" for the fit. Type 124 (standard type) Type 125
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