JIS 16K SOHFF 25A Flange

In the flange, FF represents a flat sealing surface, whilst in the Japanese standard, SOP is a plate kind flat welding flange, SOH is a neck flat welding flange, and BL is a flange cowl

Socket welding flange (SW)
Socket welding flange
Socket Welding Flange
Sealing floor form: protruding floor (RF), concave and convex floor (MFM), tongue and groove floor (TG), ring connection floor (RJ)
Materials: Carbon Steel: ASTM A105, 20#, Q235, 16Mn, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70;
Alloy steel: ASTM A182 F1, F5a, F9, F11, F12, F22, F91, A182F12, A182F11, 16MnR, Cr5Mo, 12Cr1MoV, 15CrMo, 12Cr2Mo1, A335P22, St45.8/III., 35CrMoV, 45CrMo, etc
Manufacturing standards: ANSI B16.5, GB/T9117.1-2000—GB/T9117.4-200, etc
(7) Threaded flange (TH)
Thread flange nominal diameter: DN8~DN100 Working pressure: 1.0~2.5 (MPa) Plate kind thread flange material: stainless steel, carbon steel, alloy steel.
Thread flange use: appropriate for fireplace protection, gas, warm and bloodless water, air conditioning, air strain pipe, oil pipe, instrument, hydraulic pipe and different industrial and civil pipe thread lock sealing.
Flange cowl (BL)
Flange cover, additionally recognized as blind flange, is a flange besides a gap in the center for sealing the pipe plug. There are many varieties of sealing surfaces, which includes plane, convex, concave and convex surface, tongue and groove surface, and ring connection surface.
Sealing surface: planar (FF), protruding floor (RF), concave-convex floor (MFM), tongue and groove floor (TG), ring connection floor (RJ)
Production Materials:
Carbon Steel: ASTM A105, 20#, Q235, 16Mn, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70;
Stainless steel: ASTM A182 F304, 304L, F316, 316L, 1Cr18Ni9Ti, 0Cr18Ni9Ti, 321, 18-8;
Alloy steel: ASTM A182 F1, F5a, F9, F11, F12, F22, F91, A182F12, A182F11, 16MnR, Cr5Mo, 12Cr1MoV, 15CrMo, 12Cr2Mo1, A335P22, St45.8/III.