For Eaton Char-Lynn 4000 Series Motor. Output Shaft: 31.75 [1.250] Dia. 375-16unc-2b Thread, 53.1 [2.09] Max Coupling Length, 7.938.3125 Sq X 41.27 [1.625] Straight Key. Mounting Type: Standard, 4 Bolt; 101.60 [4.000] Pilot Dia 14.7.58 Slots On 127.00 [5.000] Dia.