(57) ) Apparatus for installing rivet nuts comprises a body (9) having therein a spindle
(5) which is drivable in the forward and reverse directions and a threaded mandrel
(29) for receiving the rivet nut, and an anvil (35) against which the rivet nut abuts. In order to avoid damaging of the rivet nut when crimping it in position, a clutch
(45, 47) is disposed between the spindle and threaded mandrel to prevent rotation
of the latter when a predetermined torque is reached. The mandrel is engaged by a
pull sleeve (21) and an axial load is applied to the mandrel and hence to the rivet
nut by way of a pull nut (19) which is received threadingly on the spindle and which
co-operates with the pull sleeve (21).
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