part; component part
Refers to a constituent part of a machine, device, or system; often used in technical or manufacturing contexts.
この機械の部分品はすべて国産です。
All the parts for this machine are domestically produced.
故障した部分品を交換する必要があります。
We need to replace the faulty component.
Compound of 部分 (ぶぶん, 'part, portion') and 品 (ひん, 'article, goods').