O-rings and guide rings are both used on hydraulic cylinders, but they handle different tasks. O-rings are often the first choice for engineers because of their flexibility and performance in static ...

But this doesn't always work and O-rings can pop out. The Trap-Seal, a trapezoidal O-ring from Parker Hannifin Tube Fittings Div. (parker.com/tfd), eliminates this ...

Many of the synthetic molecular machines 1 that have been developed in the past 40 years are based on rotaxanes: molecules in which a ring-shaped component encircles a linear axle that is terminated ...