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Slip on Flanges
For essential pipe-to-pipe connectivity in a wide range of industries, Slip On Flanges from Fortis Forge are recognized for their excellent strength, ease of installation, and superior resistance to pressure, corrosion, and mechanical stress. These flanges are precision-engineered to meet performance and durability standards as per ASTM A105, ASME B16.5, and applicable DIN specifications. Manufactured using carbon steel or mild steel, our slip on flanges offer robust mechanical properties and are ideal for low-pressure piping applications where easy alignment and welding are required.
With advanced machining, controlled forging, and strict quality checks, Fortis Forge Slip On Flanges deliver outstanding sealing integrity and structural reliability in challenging industrial environments. These flanges are designed to slip over the pipe and are welded both on the inside and outside, ensuring a strong, leak-proof connection. Suitable for both indoor and outdoor systems, they help reduce installation time and are commonly used in oil & gas, power plants, refineries, chemical processing, and water treatment facilities.
Available in a variety of sizes, pressure ratings, and facing types (like RF, FF), our Slip On Flanges provide secure, durable, and cost-effective solutions for fluid handling and pipeline integrity across critical applications.
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- Size
½” to 48” (DN15–DN1200)
- Standard
ASME B16.5 / BS 4504 / EN 1092-1
- Material
Carbon Steel (ASTM A105) / Mild Steel (IS 2062)
- Enquiry
What is a Slip-On Flange?
A Slip-On Flange is a low-profile, forged flange that is slipped over the pipe and then fillet welded on both the inside and outside for added strength. It is commonly used in low-pressure, non-critical applications where cost and ease of installation are key considerations.
This type of flange allows for:
Easy alignment of the flange and pipe during installation
Welding on both sides for improved strength and leak resistance
Cost-effective solution for fluid and gas transmission systems
Slip-On Flanges are ideal for pipe systems that require frequent dismantling and inspection or where welding precision is critical but high-pressure strength is not the primary concern.
Material Grades We Use
At Fortis Forge, we manufacture Slip-On Flanges in:
Carbon Steel (ASTM A105)
→ Offers excellent strength, weldability, and pressure resistance. Preferred for medium-to-high temperature applications in refineries, power plants, and process piping.
Mild Steel (IS 2062)
→ Economical option with good machinability and ductility. Well-suited for low-pressure pipelines and general industrial use.
All our flanges are manufactured to deliver:
Precise bore alignment
Uniform thickness and facing finish
Durability under mechanical and thermal stress
Compatibility with gasket sealing standards
Manufacturing Standards at Fortis Forge
We ensure each Slip-On Flange meets international standards through:
Forging and CNC machining
Beveling and facing (RF/FF finishes)
Heat treatment for strength & hardness
Non-destructive testing (NDT)
Dimensional and pressure testing
Mill Test Certificates and full traceability
Conforming to ASME B16.5, IS 6392, EN 1092-1, and other relevant global standards.
Applications Across Industries
Fortis Forge Slip-On Flanges are used in:
Oil & Gas Distribution
Petrochemical & Chemical Plants
Power Generation (Thermal, Hydro, Nuclear)
HVAC & Fire Protection Systems
Water Supply & Wastewater Treatment
General Structural & Utility Piping
Their adaptability and cost-efficiency make them a preferred choice in piping systems requiring reliable yet affordable connection solutions.
Why Choose Fortis Forge?
High-grade carbon & mild steel with MTCs
In-house dimensional and material testing
Reliable forging, machining, and surface finishing
Quick turnaround and global dispatch capabilities
Comprehensive documentation and export support
Slip On Flanges – Class 150/300/600, Carbon Steel Slip On Flange Fittings, Mild Steel SORF Flanges, ASTM A105 Slip On Flanges, ASME B16.5 Flanges, High Pressure CS/MS SORF Flanges, Raised Face & Flat Face Slip On Flanges Manufacturer in India
As a leading manufacturer of Slip On Flanges, Fortis Forge is dedicated to producing high-quality pipe flanges that conform to stringent international standards. Our manufacturing process involves precision machining, accurate drilling, and thorough inspection to ensure each flange delivers superior sealing performance, dimensional accuracy, and long-term durability. In India’s highly competitive market for flanges, our commitment to quality, consistency, and customer satisfaction clearly distinguishes us.
When selecting Slip On Flanges for your piping systems, it is essential to consider the size, pressure class (150#, 300#, etc.), material grade, and end-use requirements. Our slip on flanges are designed to slide over the pipe and are then welded on the inside and outside to provide strength and prevent leakage. These flanges are widely used in oil & gas, petrochemicals, power plants, refineries, water treatment, and general industrial piping systems.
Available in carbon steel and mild steel (ASTM A105, IS 2062) and compliant with ASME B16.5 and DIN standards, our slip on flanges offer excellent mechanical strength, corrosion resistance, and weldability. Whether you’re working in moderate-pressure environments or demanding service conditions, Fortis Forge supplies dependable slip on flanges tailored to your specific operational needs.
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- Slip On Flanges Specification
| Specifications | ASME B16.5 / BS 4504 / EN 1092-1 |
| Size Range | ½” to 48” (DN15 to DN1200) |
| Types | Slip On Flange, Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Pressure Class | Class 150, 300, 600, 900, 1500 |
| Material Grades | Carbon Steel (ASTM A105), Mild Steel (IS 2062) |
| Standard | ASTM, ASME, ANSI, DIN, EN, JIS, BS |
| Applications | Oil & Gas, Refinery, Power Generation, Petrochemical, Shipbuilding, Water Treatment |
- Slip-On Flange Dimensions (CS/MS) – Class 150 to 600
| NPS (in) | Class | OD (mm) | Thickness (mm) | RF Dia (mm) | Bolt Count | Bolt Dia | Bolt Circle Dia (mm) |
|---|---|---|---|---|---|---|---|
| 1/2 | 150 | 89 | 11.2 | 35 | 4 | M12 | 60.3 |
| 3/4 | 150 | 98 | 12.7 | 43 | 4 | M12 | 69.9 |
| 1 | 150 | 108 | 14.2 | 51 | 4 | M12 | 79.4 |
| 1 1/4 | 150 | 117 | 15.7 | 64 | 4 | M12 | 88.9 |
| 1 1/2 | 150 | 127 | 15.7 | 73 | 4 | M16 | 98.4 |
| 2 | 150 | 152 | 17.5 | 92 | 4 | M16 | 120.7 |
| 2 1/2 | 150 | 178 | 19 | 105 | 4 | M16 | 139.7 |
| 3 | 150 | 190 | 20.6 | 127 | 4 | M16 | 152.4 |
| 4 | 150 | 229 | 22.3 | 157 | 8 | M16 | 190.5 |
| 1/2 | 300 | 95 | 14.3 | 35 | 4 | M12 | 66.7 |
| 3/4 | 300 | 117 | 15.9 | 43 | 4 | M12 | 82.6 |
| 1 | 300 | 124 | 17.5 | 51 | 4 | M16 | 88.9 |
| 1 1/4 | 300 | 133 | 19.1 | 64 | 4 | M16 | 98.4 |
| 1 1/2 | 300 | 156 | 20.6 | 73 | 4 | M16 | 114.3 |
| 2 | 300 | 165 | 22.3 | 92 | 8 | M16 | 127.0 |
| 2 1/2 | 300 | 190 | 25.4 | 105 | 8 | M16 | 149.2 |
| 3 | 300 | 210 | 26.9 | 127 | 8 | M20 | 168.3 |
| 4 | 300 | 254 | 28.5 | 157 | 8 | M20 | 200.0 |
| 1/2 | 600 | 95 | 17.5 | 35 | 4 | M12 | 66.7 |
| 3/4 | 600 | 117 | 19.1 | 43 | 4 | M12 | 82.6 |
| 1 | 600 | 124 | 20.6 | 51 | 4 | M16 | 88.9 |
| 1 1/4 | 600 | 133 | 22.3 | 64 | 4 | M16 | 98.4 |
| 1 1/2 | 600 | 156 | 23.9 | 73 | 4 | M16 | 114.3 |
| 2 | 600 | 165 | 26.9 | 92 | 8 | M16 | 127.0 |
| 2 1/2 | 600 | 190 | 30.2 | 105 | 8 | M20 | 149.2 |
| 3 | 600 | 210 | 31.8 | 127 | 8 | M20 | 168.3 |
| 4 | 600 | 273 | 34.9 | 157 | 8 | M20 | 200.0 |
The Slip On Flange price can vary depending on size, pressure class (150#, 300#, etc.), face type (RF, FF, RTJ), material grade, and order quantity. Typically, the price for carbon steel or mild steel slip on flanges ranges from ₹45 to ₹950 per piece, depending on dimensions and standards. As a trusted slip on flange supplier in India, Fortis Forge offers competitive pricing while maintaining a strong focus on precision engineering and product integrity.
Quality Assurance
To preserve the high standards of our selection of Forged Fittings, Buttweld Fittings, Flanges and we have always adhered to a systematic quality management process.
Team of Experts
Our staff of experts is vibrant and talented, and they have always been our largest supporters and contributors to our success.
- Equivalent Grades of Slip On Flanges
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
| ASTM A105 | 1.0432 | K03504 | SF 440A | 1501-151-430A | 20 | NF A 36-205 | P250GH / S235JR |
If you would like to inquire or place an order.
+91 83330 05894
Forged Fittings, Buttweld Fittings and Flanges Manufacturer in India
- Manufactured from high-strength carbon steel grades
- Available in forged, buttweld, and flange configurations
- Precision-machined for leak-proof, high-pressure applications
- Heat-treated and normalized to ensure durability and strength
- Tested for dimensional accuracy and pressure resistance
- Corrosion-resistant coatings available on request
- Application Industries
