PVFPro.com — Industrial Supply
Industrial Flanges
Carbon Steel, Stainless & Companion
Weld neck, slip-on, blind, threaded, and socket weld flanges. ASME B16.5 in 150# through 2500#. Real inventory, fast shipping, project pricing available.
Get a Quote →Weld Neck • Slip-On • Blind • Threaded • Socket Weld • Lap Joint • Companion • Carbon Steel • Stainless • 150# to 2500#
Overview
Pipe Flange Supplier — All Types & Pressure Classes
PVFPro stocks carbon steel pipe flanges manufactured to ASME B16.5 in pressure classes 150# through 2500#. Available flange types include weld neck, slip-on, blind, threaded, socket weld, and lap joint. Material grade A105 for standard carbon steel service.
We also stock companion flanges for connecting pipe to pumps, valves, meters, and flanged equipment — available in threaded and slip-on configurations. Sizes 1/2" through 24". Raised face standard; flat face and ring type joint available on request. Mill certifications provided. Bulk and project pricing available — same-day quotes.
Shop Flanges
Flange Categories
Carbon Steel Flanges
ASME B16.5, A105. Weld neck, slip-on, blind, threaded, socket weld, lap joint. 150# to 2500#. 1/2" to 24".
18 products
Companion Flanges
Threaded and slip-on. Carbon steel and stainless. For pumps, valves, meters, and equipment connections.
In stock
Stainless & Alloy Flanges
304/316 stainless, duplex, and specialty alloy flanges available on request. Contact us for availability and pricing.
Quote required
Flange Types Explained
Which Flange Type Do You Need?
Not sure which flange type fits your application? Here’s a quick breakdown of the most common types we stock.
Weld Neck Flange
Long tapered hub welded to the pipe with a full-penetration butt weld. Strongest flange type — preferred for high-pressure, high-temperature, and cyclic service where stress concentration must be minimized. Radiographically inspectable.
Slip-On Flange
Slides over the pipe and is fillet welded inside and outside. Easier to align than weld neck. Used in lower-pressure applications and where the added strength of a weld neck is not required. Lower cost and widely stocked.
Blind Flange
Solid disc used to blank off the end of a pipe, valve, or pressure vessel. Used to isolate sections of a system, for future tie-in points, or for pressure testing. Available in all pressure classes.
Threaded Flange
Threaded bore threads onto the pipe end — no welding required. Used where welding is not permitted (hazardous locations) or for temporary connections. Not recommended for high-pressure or high-temperature cyclic service.
Socket Weld Flange
Pipe inserts into a recessed socket and is fillet welded. Used on small-bore, high-pressure piping (typically 2" and under). Provides a smoother bore than threaded flanges. Common in Class 600 and above service.
Lap Joint Flange
Used with a stub end fitting — the flange is free to rotate around the stub end, making bolt hole alignment easy. Common in systems requiring frequent disassembly or where stub ends are a different (more expensive) alloy than the flange.
Quick Reference
Flange Specifications
Standards
- ASME B16.5 (1/2" to 24")
- ASME B16.47 (26" to 60", on request)
- API 605 (large diameter, on request)
- MSS SP-44 (pipeline flanges)
Pressure Classes
- Class 150 (285 PSI at ambient)
- Class 300 (740 PSI at ambient)
- Class 600 (1480 PSI at ambient)
- Class 900, 1500, 2500 available
Materials
- A105 carbon steel (standard)
- A694 (high-yield pipeline service)
- A350 LF2 (low-temperature)
- 304/316 stainless (A182, on request)
- Duplex and alloy (on request)
Facing Types
- Raised face (RF) — standard
- Flat face (FF) — for cast iron mating
- Ring type joint (RTJ) — high-pressure
- Tongue & groove, male & female available
Common Questions
Flange FAQ
What flange class do I need for my application?
Flange class is determined by your operating pressure and temperature. Class 150 is rated to approximately 285 PSI at ambient for carbon steel — common for water, steam, and low-pressure process piping. Class 300 handles up to ~740 PSI. For higher-pressure service, Class 600, 900, 1500, or 2500 may be required. Always confirm with your engineering spec. Not sure? Call us and we can help.
What is the difference between raised face and flat face flanges?
Raised face (RF) flanges have a small raised ring on the gasket seating surface — the standard for most industrial steel piping. Flat face (FF) flanges have a flat seating surface across the full flange face — required when mating to cast iron flanges to prevent cracking from uneven bolt load. Most carbon steel flanges are supplied raised face unless otherwise specified.
Do you stock flanges with mill certifications?
Yes. Mill test reports (MTRs) are available for carbon steel flanges. For applications requiring full material traceability, certified material, or NACE compliance, contact us and we’ll confirm certification availability before you order.
Can I get project pricing on a flange order?
Yes. PVFPro handles project flange packages — submit your sizes, pressure classes, and quantities through the quote request page and we’ll respond same day. We supply everything from single flanges to full project takeoffs.