Screw threads are another simple machine, ... One place you commonly encounter multiple start threads is when you screw/unscrew the cap on a high-quality Fountain Pen.

Black phenolic closed screw cap 13-425 thread with Silicone/PTFE liner: PK/1000: CP-03-13425CE-BD: £345.00: Image Credit: Chromatography Direct Ltd. Image Credit: Chromatography Direct Ltd.

Screw caps for wine bottles have been around since the late 1950s, but they were initially associated with value-oriented jugs of wine. That image started to change about a decade ago, ...

Black phenolic closed screw cap 15-415 thread with Silicone/PTFE liner: PK/1000: CP-03-15415C: £745.00: Black phenolic closed screw cap 13-425 thread with Silicone/PTFE liner: PK/1000: ...

Precise moves depend on ball-screw threads. May 5, 2005. The degree to which a ball screw performs well in the field is the direct result of the process used to make it. Lawrence Kren.