ANSI B16.5 SO Flange

QS Flange: Yuyao ANSI B16.5 SO Flange

Forged ANSI B16.5 SO flange, 4 inch 150LB RF in A182 F304 stainless steel, for fast fillet-weld connection to equipment or pipe.

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One-Minute Overview

SO flange dimensioned to ANSI B16.5 for a 4 inch 150LB joint.
Forged body with a raised face for reliable gasket seating.
ASTM A182 F304 stainless steel fights corrosion in general industrial service.
Connected to equipment or pipe by fillet weld directly.

This ANSI B16.5 SO flange covers the common 4 inch 150LB connection. ANSI B16.5 sets the dimensions, bolt drilling and facing, so parts from different batches still line up on site. The body is forged, not plate-cut, for the strength a pressure part needs, and ASTM A182 F304 gives the face and hub good corrosion resistance in normal plant utility duty.

Name: ANSI B16.5 SO Flange
Size: 4"
Pressure: 150LB
Material: ASTM A182 F304
Flange Face: RF
Process: Forged
Standard: ANSI B16.5

Welding the flange on by fillet weld keeps fit-up quick on equipment nozzles and pipe ends that do not need a butt-weld preparation. The raised face works with the usual 150LB gasket styles, and the 304 grade handles water, air and mildly corrosive chemicals without the maintenance load of carbon steel. Order with class-matching studs and nuts, and tighten in a cross pattern to the gasket maker's guidance. Because the dimensions are fully standardized, one spare flange covers several lines of the same size and class, which simplifies stocking and speeds emergency repairs.

FAQ

Q1. Will this flange rust if I leave it on the loading dock?

Forged A182 F304 shrugs off normal rain and humidity far better than carbon steel, but no stainless enjoys a salt bath for months. Store it dry, keep the face protected, and it arrives ready to bolt. Long-term corrosion resistance in service is what the 304 grade is really for.

Q2. How does ANSI B16.5 affect everyday installation of this flange?

ANSI B16.5 fixes the outside diameter, thickness, bolt circle and drilling for this 4 inch 150LB flange, so it mates with any compliant flange of the same size and class. Gaskets, studs and mating flanges therefore remain standard, interchangeable parts.

Q3. What does connected by fillet weld directly mean in practice?

It means you weld the flange to the pipe or equipment with a fillet weld instead of a butt weld. Fit-up is faster and more forgiving in the field, which is handy on skids and valve outlets. Follow your welding procedure for the actual fillet size and passes.

Q4. Do you have a minimum order quantity?

Standard flange insulation gasket kits start at one set, and standard gaskets, studs, washers and sleeves start at one piece. Parts made to your drawing or to a non-standard bolt pattern are quoted one by one, because the minimum really depends on the material and the tooling involved.

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