To preclude premature wear and seal failure, the metal surfaces which contact o-rings during installation and system operation must be properly prepared. Preparation consists of appropriate selection of materials, as well as machining for optimum surface finish.

To prevent o-ring extrusion or nibbling, rectangular, straight-sided, glandular grooves are best. For pressures up to 1,500 psi, 5° sloping sides are acceptable and easier to machine. Break all sharp corners by at least 0.005″ to avoid unnecessary cutting or nicking of o-rings during assembly and operation.