N293FF-SS - Stainless Steel 150# Lap Joint Flat Face Flange These are "floating" flanges that are also known as lap-joint or Vanstone flanges. When used with a turnback nipple (which creates a raised face), they will swivel to allow simple alignment of bolt holes. They are ideal where the hose or pipe must be continually broken down for inspection or cleaning. Detail Comments: Conforms to ASTM A-105 and ASME/ANSI B16.5