Slip On Flange
SOF · SORF · SOFF · Slip-On Raised Face
Slides over pipe OD and is fillet-welded inside and outside. Easy to align, economical, suitable for moderate pressure services. Class 150# to 600#, sizes ½″–24″.
Your definitive source for every ASME B16.5 flange type — Slip On, Weld Neck, Blind, Orifice, Spectacle Blind, Nipoflange and 26+ more. Sizes ½″ to 60″, Class 150# to 2500#, all grades of steel.
Forging, CNC machining, hydro testing — all under one roof
Supplying to 80+ countries across Middle East, USA, Europe & Asia
Third-party inspection: Bureau Veritas, Lloyd's, SGS, IRS
Ready stock + custom manufacturing. Expedite orders accepted
We are a dedicated manufacturer, supplier, stockist, and global exporter specializing exclusively in ASME B16.5 flanges — covering every type, material, face finish, and pressure class the industrial world demands.
Operating from Mumbai, India — the heart of India's steel and piping industry — our facility spans a modern production floor equipped with advanced forging machines, precision CNC machining centers, hydro-testing systems, and in-house laboratory testing.
From standard carbon steel Slip On flanges for Class 150# water service, to exotic Nicoflange assemblies in Super Duplex for offshore NORSOK applications — we manufacture to your specification, with full MTRs, third-party inspection reports, and certified documentation.
We manufacture every standard and special flange type recognized under ASME B16.5, B16.47, B16.36, and industry-specific standards. Each type is available across all pressure classes and material grades.
Slides over pipe OD and is fillet-welded inside and outside. Easy to align, economical, suitable for moderate pressure services. Class 150# to 600#, sizes ½″–24″.
Long tapered hub butt-welded to pipe. Superior stress distribution, preferred for high-pressure, high-temp and cyclic service. All classes 150#–2500#.
Solid disc used to seal the end of a pipe, valve, or pressure vessel. Available in all pressure classes with RF, FF, or RTJ face types.
Internally threaded bore screwed onto pipe. No welding required — ideal for low-pressure, non-flammable service and where welding is not permitted.
Pipe is inserted into a socket recess and fillet-welded. Excellent for small-bore high-pressure piping NPS ½″ to 2″, Class 3000# to 9000#.
Used with a stub end (lap joint stub end). Rotates freely allowing bolt-hole alignment. Ideal for frequent disassembly and costly alloy piping (only stub end contacts fluid).
Flat plate with bolt holes and a bore. Similar to a Slip On but without the hub. Used in low-pressure, non-critical applications. Available in custom sizes.
Extended neck functions as a nozzle on pressure vessels, columns, and heat exchangers. ASME B16.5 and custom lengths available. High-pressure / high-temp service.
Pairs of flanges with tapped pressure tap holes for measuring flow via orifice plates. Supplied as a complete assembly with orifice plate, jack screws, and centering ring.
Connects pipes of different diameters within the same flange face. Eliminates need for a separate reducing fitting. Available in concentric and eccentric forms.
Increases bore size at the flanged joint — transitions from a smaller to a larger pipe size, acting as an inline reducer in reverse. Custom manufactured to drawing.
Integrates a Nipolet (branch outlet) with a flange face for flanged branch connections on headers. Reduces weld joints, improves flow, used in high-pressure oil & gas piping.
Combines a Weldolet branch outlet with a flange. Welded directly onto the run pipe to create a self-reinforced flanged branch fitting.
Dual-function device: solid blind disc + open ring spacer joined by a web (figure-8 shape). Rotated in-line to isolate or allow flow — ideal for maintenance and shutdown operations.
Individual components of the spectacle blind: Spade (solid blind paddle) and Spacer (open ring). Used separately for larger bore sizes where a combined spectacle is too heavy.
Hub and flange ring are separate — flange ring rotates freely around hub for precise bolt-hole alignment in subsea, offshore, and remote installation environments.
High-integrity compact flanges per NORSOK L-005. Smaller, lighter than ASME equivalents — designed for offshore/subsea where space and weight are critical. RTJ-style metal seal.
Flanges NPS 26″ to 60″ per ASME B16.47 Series A (MSS SP-44) and Series B (API 605). Used in large-bore pipelines, tanks, pressure vessels, and industrial plants.
Custom forged and precision CNC-machined flanges to customer drawings. Available in any shape, size, and material — from standard carbon steel to exotic nickel alloys.
Blind flanges with elevated hubs for additional reinforcement in high-pressure applications. Used where extra wall thickness and face-to-face dimensions exceed standard B16.5.
Square-body flanges for hydraulic systems and JIS B2291 standard applications. Common in hydraulic power units, industrial presses, and Japanese standard piping.
Elliptical or oval-shaped flanges manufactured to special drawings for unique equipment connections, heat exchangers, and non-standard industrial applications.
Two-piece flanges that clamp around pipe OD for retrofitting without disassembly of the line. Used for hydraulic piping repairs and line additions.
Ultra-high vacuum (UHV) flanges for laboratory, semiconductor, and scientific equipment. KF (NW), CF (ConFlat), ISO-K and ISO-F types with knife-edge metal seals.
Electrically isolating flange assemblies with non-conductive gaskets, sleeves, and washers for cathodic protection of buried or submerged pipelines. Full kits supplied.
Backing flange used with Stub Ends (Lap Joint Stub Ends) per ASME B16.9. Loose ring rotates for bolt-hole alignment. Economical for corrosion-resistant alloy piping.
Fully custom flanges machined to customer-supplied 2D/3D drawings or specifications. Any material, any dimension, any face finish — DXF, DWG, PDF drawing accepted.
The face type determines gasket compatibility and sealing performance. We supply all standard ASME facing types plus special custom designs.
Most common ASME face type. A raised circular area around the bore where the gasket sits. Works with flat, spiral wound, and ring gaskets. Suitable for most industrial applications.
Entire flange face is flat. Required when mating with cast iron or non-metallic flanges to prevent face cracking under bolt load. Uses full-face gaskets spanning all bolt holes.
Machined groove accepts oval or octagonal metal ring gaskets. Creates high-integrity metal-to-metal seal for high-pressure, high-temperature services. Preferred in refineries and HPHT.
One flange has a raised male face, the matching flange has a recessed female face. Gasket is confined and self-centering. Used in pumps, compressors, and lined equipment.
Tongue projects into a matching groove on the mating flange, fully confining the gasket. Provides excellent sealing and gasket location control. Available in large and small variants.
Recessed bore area for specific gasket configurations in heat exchangers and shell-and-tube applications.
Machined groove accommodates O-ring seals for gas-tight applications requiring elastomeric sealing.
Circumferential grooves machined on pipe ends for Victaulic-style mechanical coupling systems.
PTFE, rubber, or other lining applied to the flange face for chemical resistance and electrical isolation.
Stock finish — concentric or spiral grooves machined at 125–250 AARH. Provides positive grip on soft gaskets. Default finish per ASME B16.5.
Finish ≤63 AARH. Required for ring joint grooves, metallic gaskets, and special applications where precision contact is critical.
125–250 AARH machined finish for standard industrial flanges. Provides proper gasket seating without excessive surface roughness.
ASME B16.5 flanges are available in a comprehensive range of ASTM/ASME certified material grades to suit every process condition — from ambient temperature water service to extreme sour/offshore environments.
A105 / A105N
A350 LF2 / LF3
A694 F42–F70
A181 Gr.60/70
ASTM A182 F304
F304L / F304H
UNS S30400
ASTM A182 F316
F316L / F316H
F316Ti
A182 F321 / F321H
F347 / F347H
Stabilized grades
A182 F310 / F310S
F317 / F317L
High-temp grades
ASTM A182
UNS N08904
High corrosion resistance
F5 / F9 / F11
F22 / F91
ASTM A182
UNS S31803
S32205 (2205)
A182 F51
UNS S32750 (2507)
S32760
A182 F53 / F55
Alloy 600 / 601
625 / 718
Incoloy 800/825
Monel 400
Monel K500
ASME SB564
C-22 / C-276
B-2 / B-3
Hastelloy X
Cu-Ni 90/10
Cu-Ni 70/30
ASME SB151
Grade 2 / Grade 5
ASME SB381
Ti-6Al-4V
Carpenter 20
UNS N08020
ASME SB462
UNS S31254
6Mo Austenitic
ASTM A182 F44
Quick reference guide to ASME B16.5 standard parameters. Full dimension tables available on request.
| Parameter | ASME B16.5 Range | ASME B16.47 Range | Notes |
|---|---|---|---|
| Size Range (NPS) | ½″ to 24″ (DN 15–600) | NPS 26″ to 60″ | Special sizes on request |
| Pressure Classes | 150, 300, 600, 900, 1500, 2500 | 75, 150, 300, 600, 900 | Higher classes for severe service |
| Flange Face Types | RF, FF, RTJ, M&F, T&G | RF, FF, RTJ | Special faces on request |
| Facing Finish | 125–250 AARH (serrated), 63 AARH (smooth) | Same as B16.5 | Per ASME B16.5 Clause 6 |
| Carbon Steel (A105) | –29°C to 538°C | Same | Pressure varies by class & temp |
| SS 316L (F316L) | –254°C to 538°C | Same | Low-temp & cryogenic service |
| Bolting Standard | ASME B18.2.1 / B18.2.2 | Same | Stud bolts + 2 heavy hex nuts |
| Inspection Standard | ASME B16.5 MSS SP-6, NACE | MSS SP-44 / API 605 | 3.1 / 3.2 MTR available |
| Testing | Hydro / PMI / Hardness / UT | Same | Third-party inspection available |
| Surface Treatment | Black, Galvanized, Primer, Coated | Same | Anti-rust oil as standard |
ASME B16.5 flanges serve as critical connection components across virtually every major process industry worldwide.
Upstream, midstream & downstream. Wellhead, manifold, pipeline, refinery, LNG and FPSO applications.
Process vessels, reactors, columns, heat exchangers, and corrosive chemical service requiring alloy flanges.
Desalination plants, water distribution, wastewater treatment, and municipal water works infrastructure.
Thermal, nuclear, hydro, and gas turbine plants — boiler feedwater, steam, condensate and cooling systems.
HVAC, fire suppression, process piping in industrial buildings, commercial complexes, and infrastructure.
Compressed air, cooling water, hydraulic, and process fluid systems in general industrial manufacturing plants.
Subsea, offshore platforms, FPSO vessels. Cu-Ni, Super Duplex, and NORSOK compact flanges for seawater service.
High-purity SS 316L flanges for clean room, sterile processing, and pharmaceutical process piping.
Ultra-high vacuum flanges (KF, CF, ISO) for semiconductor fabrication, particle accelerators, and laboratory systems.
What sets us apart as your ASME B16.5 flange manufacturer and supplier of choice.
Complete vertical integration — forging, heat treatment, CNC machining, facing, hydro testing, and marking — all under one roof for full quality control.
EN 10204 3.1 and 3.2 Mill Test Reports, NACE MR0175, PWHT certificates, dimensional inspection reports, and hydrotest records supplied with every order.
Bureau Veritas, Lloyd's Register, SGS, IRS, and client-nominated TPI agencies accepted. Witness tests arranged on request.
Export-packed and shipped to 80+ countries including UAE, Saudi Arabia, USA, UK, Singapore, Australia, and across Africa and Southeast Asia.
Ready stock of common sizes. Expedited manufacturing for urgent requirements. Partial shipments accepted to meet project deadlines.
Non-standard flanges manufactured to customer drawings (DXF, DWG, PDF). Any size, any material, any face finish. Engineering support available.
We supply ASME B16.5 flanges to procurement teams, EPC contractors, and distributors across 80+ countries worldwide.
Middle East: United Arab Emirates, Saudi Arabia, Qatar, Oman, Kuwait, Bahrain, Iraq, Jordan, Lebanon, Yemen | Asia: India, Singapore, Malaysia, Indonesia, Philippines, Vietnam, Thailand, Bangladesh, Sri Lanka, Myanmar, Cambodia | North America: United States, Canada, Mexico | Europe: Germany, UK, France, Italy, Spain, Netherlands, Norway, Sweden, Poland, Turkey | Africa: South Africa, Nigeria, Egypt, Kenya, Morocco, Algeria, Ghana, Tanzania, Ethiopia | South America: Brazil, Argentina, Chile, Colombia, Peru, Venezuela | Oceania: Australia, New Zealand
Answers to the most common questions about ASME B16.5 flanges — optimized for search engines and AI assistants.
Send us your inquiry with flange type, size, quantity, material, and standard. Our technical sales team will respond with a competitive quote within 24 hours — typically faster.