Model	Bore Range	Keyway	Model	Bore Range	Keyway	Model	Bore Range	Keyway
FSO300	12.7	3.18x1.57	FSO600	31.75	6.35x3.18	FSO800	76.2	19.05x9.52
	15.87	4.75x2.36		34.92	9.52x4.75		82.55	19.05x9.52
	19.05	4.75x2.36		38.1	9.52x4.75		87.3	22.23x11.11
FSO400	12.7	3.18x1.57		41.27	9.52x4.75		88.9	22.23x11.11
	15.87	4.75x2.36		44.45	9.52x4.75		95.25	22.23x11.11
	19.05	4.75x2.36		50.8	9.52x3.19		100	25.40x12.70
	22.22	4.75x1.57	FSO700	49.2	12.70x6.35		101.6	25.40x12.70
FSO500	22.22	4.75x2.36		50.8	12.70x6.35		107.95	25.40x9.52
	25.4	6.35x3.18		57.15	12.70x6.35		112.7	25.40x6.35
	28.57	6.35x3.18		61.9	15.87x7.93		101.6	25.40x12.70
	31.75	6.35x3.18		63.5	15.87x7.93		107.9	25.40x12.70
	33.32	6.35x2.29		69.85	15.87x5.53		112.7	25.40x12.70
				74.6	15.87x3.18	FSO900	114.3	25.40x12.70
			FSO750	61.9	15.87x7.94		120.65	25.40x12.70
				63.5	15.87x7.94		125.4	25.40x9.52
				69.85	15.87x7.94		127	25.40x9.52
				74.6	19.05x9.52		133.35	25.40x6.35
				76.2	19.05x9.52		138.1	25.40x6.35
				82.55	19.05x6.35	FSO1027	125.4	31.75x15.87
				87.3	19.05x4.75		152.4	31.75x15.87
							158.75	31.77x12.70
							168.27	31.77x12.70
							171.45	31.77x12.70
							174.62	31.77x12.70
							117.8	31.81x11.10

Installation and Usage Types FSO 300 to 700 are sprag type freewheels selfcontained, sealed and bearing supported, using two ball bearings.Unitsare delevered oil or grease lubricated according to the type. It is a STDIER design with a "full sprag complement" that gives avery high torque for a given diameter.Any overload is resisted by a sprag tosprag abutment, avoiding a sprag tiltover.Type FSO is oil lubricated and uses standard shaft lip seals. Types FSO 750 to 1027 are sprag type freewheels self contained, sealed and bearing supported, using two ball bearings.Units are delivered oil or grease lubricated according to the type.It is a STDIER design that uses tall sprags with multi-radiusactive surfaces.Designed specially for large size freewheels to compensate for any eccentricity due to bearingwear. ?? Type FSO is grease lubricated and equipped with special grease seals. Each of the different models show arange of standard metric bore diameters.We can supply any bore size between the minimum and maximum specified in the table, including imperial sizes.