The Mitsubishi HG-JR903BK is a servo motor from the HG series, classified under servo motors in the Motors & Motor Controls category. It carries an oil seal and a standard straight shaft end.
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The oil seal means the motor is built to retain lubricant and exclude contaminants in the bearing area — relevant for applications where washdown or particulate exposure is a concern. Standard straight shaft is the common keyed-shaft interface; no special machining or adapter needed for most couplings or pulleys.