304042 - Shaft Clamp ( Threaded Collar), One piece, split, 3/8-12 acme right hand thread, one start, Black Delrin, with stainless steel hardware.

Note: These Shaft clamps will work only 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. .   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 1 start lead screw, will NOT fit other start acme thread lead screws.