Metal-to-metal seals represent the primary sealing technology in API 6A wellhead equipment utilizing precision-machined metal rings creating gas-tight barriers through controlled deformation under bolt load. These seals include R-type oval rings, RX-type pressure-energized rings, and BX-type self-energizing gaskets manufactured from soft iron, stainless steel, or corrosion-resistant a... https://globalsealstech.com/product-category/oil-gas-seals/api-6a-wellhead-equipment-seals/