BX ring gaskets for 15,000–20,000 psi API 6A flanges feature precise pitch-diameter control and 23° sealing angles. Manufactured from materials traceable to NACE MR0175/ISO 15156, they accommodate thermal cycling and vibration without loss of preload, ensuring flange integrity during frac operations pumping 100+ stages. https://globalsealstech.com/product-category/oil-gas-seals/api-6a-wellhead-equipment-seals/