Surface finish specifications on sealing surfaces directly impact seal effectiveness. Metal gasket sealing surfaces require 63 to 125 microinch Ra finishes per API specifications. Elastomeric seal surfaces typically need 16 to 32 microinch Ra. Excessive roughness creates leak paths and accelerates wear. Overly smooth surfaces may not retain adequate gasket bite or lubrication. Proper ... https://globalsealstech.com/product-category/oil-gas-seals/api-6a-wellhead-equipment-seals/