304046 - Shaft Clamp ( Threaded Collar), One piece, split, 3/8-8 acme right hand thread, four start, Black Delrin, with stainless steel hardware.

Note: These Shaft clamps will not work with Single start threaded rod.

This item is used to pre-load thrust bearings on CNC machines.  The preload eliminates axis drift caused by changes of direction.    These are made from acetyl copolymer (Delrin).  See our matching zero backlash lead nuts. Both items are available in 1 start and 4 start versions.   1" OD x 7/16 thick.  6-32 unc socket clamp screw The nuts are made in USA. ( Note 1/2-single start version shown in photo).  This item will fit only 4 start lead screw, will NOT fit 1 start acme thread lead screws.