A retainer for a pneumatic tool and assembly therefor is disclosed. The
retainer includes a tool body having an internal surface defining a bore
and an external surface having a threaded portion. A retainer cap is used
with the tool body and includes an internal surface having a threaded
portion adapted to engage the threaded portion of the tool body. An insert
having an outer surface is rotatably mounted in the retainer cap. The
insert includes an inner surface with a first inner surface portion
adapted for conforming with a non-circular lug surface of a tool shank and
a second inner surface portion radially offset from the first portion
adapted for conforming with the non-circular lug surface.
