For custom ceramic tubes and sleeves, specify OD, ID, length, straightness, roundness, concentricity and critical end-face requirements separately. Tight tolerances should be reserved for dimensions that truly control fit, sealing or flow.

Bolt holes create stress concentration in ceramic. Provide suitable edge distance, assembly clearance and broad load distribution, and avoid excessive preload or metal interference around the hole.

Successful ceramic sealing requires controlled flatness, compatible gasket compliance, distributed bolt load and careful tightening. Avoid applying generic metal-flange torque practices directly to brittle ceramic components.

Metal and ceramic usually expand differently with temperature. Rigidly locking them together can create high interface stress and ceramic cracking. Use appropriate clearance, compliant support or controlled movement when designing ceramic-to-metal assemblies.

Custom ceramic parts are generally more reliable when wall thickness is reasonably uniform and thick-to-thin transitions are gradual. Abrupt section changes can create drying, firing, shrinkage and thermal stresses even when the ceramic material itself is suitable.