Complete guide to the flange types we manufacture – weld neck, slip-on, blind, socket weld, threaded, lap joint and flat face flanges in carbon steel, stainless steel and alloy steel, from 3/8″ to 160″ and PN2.5 to PN400 / Class 150 to 2500.
What Is a Flange?
A flange is a forged ring that connects pipes, valves, pumps and vessels, bolted with a gasket between the sealing faces. Flanges allow easy assembly, disassembly, inspection and cleaning of piping systems. For a full explanation see What Is a Flange?
Types of Flanges
Weld Neck Flange
Weld neck flanges (WN) have a long tapered hub for superior stress distribution, ideal for high-pressure and high-temperature piping. Pressure classes 150-2500. View Weld Neck flange details →
Slip-On Flange
Slip-on flanges (SO) slide over the pipe and are welded inside and outside. Economical and easy to align, for low-pressure service PN6-PN100. View Slip-On flange details →
Blind Flange
Blind flanges (BL) seal pipe ends or vessel nozzles. Available in FF, RF, MFM, TG and RJ facing, class 150-2500. View Blind flange details →
Socket Weld Flange
Socket weld flanges (SW) for small-bore high-pressure piping up to 3″. The pipe is inserted and fillet-welded. View Socket Weld flange details →
Threaded Flange
Threaded flanges (TH) screw onto the pipe without welding – suited where welding is impractical, 3/8″ to 4″. View Threaded flange details →
Lap Joint Flange
Lap joint flanges (LJ) pair with a stub end, allowing bolt alignment and easy rotation for maintenance. View Lap Joint flange details →
Flat Face Flange
Flat face (FF) flanges mate with cast iron or ductile iron equipment to prevent bolting stress cracking. View Flat Face flange details →
ISO / DIN EN 1092-1 Flange
DIN and EN 1092-1 flanges in PN6-PN100 pressure ratings with type 05 blind, type 01 plate and welded-neck forms. View ISO / DIN EN 1092-1 flange details →
Flange Standards We Supply
| Standard | Pressure Ratings | Sizes |
|---|---|---|
| ASME B16.5 / ANSI | Class 150 – 2500 | 1/2″ – 24″ |
| ASME B16.47 | Class 75 – 900 | 26″ – 60″ |
| DIN 2576 / 2633 / 2634 | PN6 – PN100 | DN10 – DN4000 |
| EN 1092-1 | PN2.5 – PN400 | DN10 – DN4000 |
| JIS B2220 | 5K – 63K | 10A – 1500A |
| GB / HG (China) | PN2.5 – PN400 | DN10 – DN4000 |
Sealing Faces (Flange Facing)
We machine all standard facing types: FF (flat face), RF (raised face), MFM (male-female), TG (tongue-and-groove) and RJ (ring joint). Pairing the right facing with the right gasket prevents leaks – see our flange gasket guide.
Flange Sizes & Dimensions
Need dimensions? Check our flange size charts for ASME B16.5 Class 150-2500 covering OD, bolt circle, number of bolts and thickness for each class.
Request a Quote
Send your drawing or specification to request a free flange quote – custom sizes, special materials and OEM marking available.