for lending; for loan; for circulation
Used for books, equipment, media, or other items set aside to be lent out, especially in contexts such as libraries, offices, schools, or service counters. Often modifies another noun with の or appears as a predicate with です.
This book is for loan.
I borrowed a loaner laptop at the reception desk.
The library also has DVDs available for circulation.
This library also has lending copies of magazines available.
We decided to set this bicycle aside for lending out.
We had umbrellas ready for lending out on rainy days.
貸出 is the act or system of lending something out, whereas 貸出用 is the adjectival label meaning an item is set aside for that purpose; learners often confuse the two because of their shared root.
A transparent compound of 貸出, meaning lending or checking out, plus 用, meaning use or purpose; together it means something intended for lending.