A round thread is a thread profile with rounded flanks, distinguished by its round or semi-circular shape from standard thread profiles like trapezoidal or metric ISO threads. It is frequently employed in applications requiring low-wear, smooth-running, or self-cleaning connections.
Round threads offer advantages in specific applications:
- Low wear due to rounded flanks
- Smooth running: Minimized friction during screwing in and out
- Self-cleaning: Dirt and particles are more easily displaced from the thread
- Shock absorption: Suitable for applications with soft or impact loads
Typical Applications
- Tailstocks and clamping systems
- Mechanical engineering with lighter loads
- Hydraulic or pneumatic cylinders
- Assemblies requiring frequent disassembly
Characteristics
- Flank shape: rounded, mostly semi-circular
- Pitch: often larger than ISO threads to allow for easy feed
- Load capacity: lower than trapezoidal or ball screw drives for the same dimensions
- Torque: lower due to the rounded flanks