THREAD CUTTING DIESTOCK ASSEMBLY

RT-7433 THREAD CUTTING DIESTOCK ASSEMBLY A thread cutting diestock assembly is disclosed comprising a ratchet housing having a bore adapted to selectively and detachably receive a large thread cutting die head or an adaptor ring, each of which is provided with ratchet teeth engaged by a pawl on the ratchet housing so as to be rotatable therewith. The adaptor ring has a polygonal bore adapted to detachably receive a small thread cutting die head which interengages with the polygonal bore to preclude relative rotation between the die head and adaptor ring. A circumferentially extending recess in the bore in the ratchet housing carries a non-circular split retaining spring ring which interengages with the large die head or adaptor ring to detachably secure the latter in the ratchet housing bore, and a circumferentially extending groove in the adaptor ring bore carries a polygonal split retaining spring ring which interengages with the smaller die head to detachably secure the latter in the adaptor ring bore.