Lap Joint Flange Lap Joint Flange(Loose Flange) have all the same common dimensions as any other flange named on this page however it does not have a raised face, they used in conjunction with a "Lap Joint Stub End". Size Plate flange:1/4"-160" DN8-DN4000 Pressure America Series:Class 150 ,Class 300, Class 600, Class 900A , Class 1500,Class 2500. Europe Series:PN2.5,PN6,PN10,PN16,PN25,PN40,PN63,PN100, PN160,PN250,PN320,PN400. Flange Facing Types America Series:Flat face(FF),Raised face(RF),Tongue(T),Groove(G), Female(F),Male(M),Ring type joints face(RJ/RTJ) Europe Series:Type A(Flat Face),Type B(Raised Face),Type C(Tongue),Type D(Groove),Type E(Spigot),Type F(Recess),Type G(O-Ring Spigot),Type H(O-Ring Groove) Material Carbon steel: ASTM A105,ASTM A105N,GB 20,C22.8. Alloy steel: ASTM/ASME A234 WP 1-WP 12-WP 11-WP 22-WP 5-WP 91-WP 911 Stainless steel: ASTM/ASME A403 WP 304-304L-304H-304LN-304N ASTM/ASME A403 WP 316-316L-316H-316LN-316N-316Ti ASTM/ASME A403 WP 321-321H ASTM/ASME A403 WP 347-347H Low temperature steel: ASTM/ASME A402 WPL 3-WPL 6 High performance steel: ASTM/ASME A860 WPHY 42-46-52-60-65-70 Standards ASME ANSI B16.5,ASME ANSI B16.47. API 605,API 6L. MSS SP 44 CSA Z245.12 EN1092-1,EN1759-1. DIN2573,DIN2576. BS1560,BS 4504,BS 10. AFNOR NF E29-200-1 ISO7005-1 AS2129 JIS B2220 UNI 2276. UNI 2277.UNI 2278 .UNI 6089 .UNI 6090 Industrial Processes Die forging,Machining Check from website： http://www.steelfittings-flange.com/html_products/lap-joint-flange-110.html