Logic. Shaft: 12-5/8″. OD: 15-3/8″. Johnson Cutless Flanged Bearings are centrifugally cast naval brass with an integral flange for bolting to stern tube or strut housing to retain bearing and prevent rotation in housing. Specially formulated oil and chemical resistant nitrile rubber is securely bonded to the shell. Shells are heavy walled providing structural strength and can be step turned if desired. Flanges are furnished UN-DRILLED unless specified. PRECAUTION: When shrink fitting of the bearing is required, chilling must be achieved by gradual cooling to not more than minus 20� F (-28� C) using freezer or regular ice (DO NOT DRY ICE). NOTE: Pounding or shocking the bearing while in the chilled state could cause the rubber to separate from the shell. Approved Bearings: Johnson Cutless Naval Brass Flanged Bearings meet military specification MIL-B-17901 (Ships) Class II Full-Molded type and have full type approval from The American Bureau of Shipping.