Translation guide
A pencil with a replaceable, mechanically extendable lead core. In Japanese, the most common term is シャープペンシル (often shortened to シャーペン).
mechanical pencil
Commonly shortened to シャーペン in casual speech.
The most common, everyday word for a mechanical pencil.
The standard, full term for a mechanical pencil. Used in all contexts, from school to office.
I'm going to buy a mechanical pencil.
This mechanical pencil is easy to write with.
A common abbreviation of シャープペンシル, used in casual conversation. Very natural in spoken Japanese.
Do you have a mechanical pencil?
That mechanical pencil is cute.
A more formal or technical term, often seen in product descriptions or official documents.
Literally 'mechanical pencil'. This is a direct translation but is rarely used in everyday speech. It may appear in technical contexts or older texts.
Refill the lead of the mechanical pencil.
The lead for a mechanical pencil is called シャープペンシルの芯 (しん) or simply シャー芯 (シャーしん) in casual contexts.
I need to buy some mechanical pencil lead.