The 19-year-old joins the club having made four appearances for the England Under-20s following stints at Under-16s and Under-18s level.
"This season we have been running on just two hookers and that is always a bit risky," BBC Sport quotes coach James Shanahan as saying. "He is a good physical hooker who knows me and he knows my systems.
"I have been looking for another hooker for a while and when the A League matches finished I contacted Saracens about the availability of Max. We will see how the first month goes but I would like the loan to continue until the end of the season."
Crumpton previously played under Shanahan at Old Albanians.