This is an anti-backlash nut that works with the 1/2" 10 TPI (Threads Per Inch) 5 start Lead Screw.
Mate this anti-backlash nut with 1/2" the lead screw that has 5 starts and 10 threads per inch. The effective turns per inch is two. CNC Machines require precise movement. Backlash occurs in many parts of the linear motion mechanics. With this anti-backlash nut, you will minimize this backlash tremendously. The anti-backlash is also known as a wear compensating nut.
As the machine is used over time, the lead screw may wear, and this nut will mechanically adjust for this wear. The lead screw and nut specifications: 2 turns per inch, 1/2" outside diameter lead screw, 10 threads per inch and has 5 starts (making it 2 turns per inch). The lead screw is ACME precision (same thing as saying the threads are square, not shaped like a "V"). The maximum continuous length is 77".