Element spacing within seal stacks affects overall sealing performance and mechanical behavior, with closer spacing increasing total sealing contact length but potentially creating excessive stiffness. Typical spacing places anti-extrusion rings or gauges between seal elements, providing extrusion protection and stack flexibility while maintaining adequate cumulative sealing length. https://linkingbookmark.com/story20902764/replacement-api-6a-wellhead-seals-oem-quality-oil-gas-gaskets