Like the lead-offset nut, the pitch-offset nut uses a shift machined in the I.D. threads to enable 2-point contact of balls. The only difference is that the pitch-offset nut uses a two-start thread and the offset is between the two starts.
Each thread start has its own set of balls and ball returns.
- Pitch-offset nuts are extremely compact
- Pitch-offset preload can only be used in nuts with two (or more) starts
The pitch-offset nut has at least two threads. By the offset each set of balls uses an other thread flank of the spindle.