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At Boston Gear, we manufacture our FC couplings from the highest quality alloy steel - not from powdered metal as many other industrial manufacturers do. Consisting of two metal jaws - or hubs - and an insert, this style of coupling is suited for high-torque and shock loads, does not require lubrication, and is not affected by oil, grease, dirt, or moisture. The allowable torque for the FC series of couplings is determined by the insert material. These inserts are the wearing member of the coupling and can be easily replaced with minimal effort.Thru Bore Length2.625000Product FamilyFC CouplingsWeight6.811Product DescriptionShaft Coupling, 3 Jaw FC Series-Coupling HalfAltra Master No.30214710Bore Diameter1-9/16"Max HP (Poly Insert)67.3HP @1750 RPM MAXUPC781711082980Max OD3.750000Overall Assy Length8.187500Family Id30,018Coupling SizeFC38Hub Diameter3.500000Max Torque3,000Unit Of MeasureEnglish