This is an original replacement part manufactured for use with Hitachi drill drivers. The special self-tapping screw is commonly used to fasten the two halves of the motor housing. This screw is used with several different models and can have multiple applications. The screw is sold individually, please see model diagram for associative parts.
This is a genuine replacement part sourced directly from the manufacturer. The washer is commonly found in Hitachi impact drivers. This part is made of metal, and is placed in the nose of the machine to secure the guide spring. You may require a screwdriver when replacing this item. The washer is sold as an individual replacement part.