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Caps
For reliable pipe closure and pressure containment across diverse industries, Buttweld Caps from Fortis Forge are trusted for their high strength, corrosion resistance, and dimensional accuracy. Engineered to seal the end of pipes securely, our caps conform to ASTM A234, ASME B16.9, and relevant DIN standards, ensuring durability in demanding industrial environments. Manufactured using carbon steel or mild steel, these caps provide excellent mechanical properties and leak-tight protection for piping systems.
Produced through a precision-controlled forging and forming process, Fortis Forge Buttweld Caps offer superior resistance to impact, oxidation, and high-pressure conditions. These pipe end caps are widely used to terminate the flow in pressure piping systems, prevent contamination, and allow for future system expansion or modifications.
Designed for compatibility with a wide range of pipe sizes and thicknesses, our caps are available in various schedules and comply with both seamless and welded fitting requirements. Whether used in oil & gas, chemical processing, power generation, petrochemical, or water treatment plants, our buttweld pipe caps ensure safe isolation, maintenance efficiency, and long-lasting performance. Choose from standard end caps, hemispherical caps, and ellipsoidal caps to meet your specific project needs.
Buttweld Cap, Carbon Steel Pipe End Caps, Mild Steel Buttweld Caps Price List, ASTM A234 WPB Pipe Caps, Forged Steel End Caps, CS/MS Buttweld Pipe Caps, ASME B16.9 Cap Manufacturer, Buttweld Pipe Cap Manufacturers in India
- Size
½” to 48” (DN15–DN1200)
- Standard
ASME B16.9 / MSS SP-43 / EN 10253
- Material
Carbon Steel (ASTM A234 WPB) / Mild Steel (IS 1239 / IS 3589)
- Enquiry
What is a Buttweld Cap?
A Buttweld Cap is a pipe fitting used to seal the end of a piping system or pressure vessel. It acts as a protective device to stop fluid or gas flow and prevent contamination, corrosion, or damage to open pipe ends.
These caps are welded onto the end of a pipe and are designed to withstand high pressure and temperature environments, ensuring long-lasting system integrity.
Material Grades We Use
At Fortis Forge, our Buttweld Caps are manufactured using:
Carbon Steel (ASTM A234 WPB)
→ Provides excellent strength, temperature resistance, and toughness—ideal for high-pressure and high-temperature systems in industrial and energy sectors.
Mild Steel (IS 2062)
→ Known for affordability, ductility, and ease of welding, making it suitable for low-pressure and general-purpose applications.
All caps are engineered with:
Precision end-beveling (per ASME B16.25)
Uniform wall thickness for balanced pressure distribution
Resistance to internal pressure, corrosion, and mechanical wear
Manufacturing Standards at Fortis Forge
Each Buttweld Cap undergoes:
Hot forming or cold pressing
Heat treatment for mechanical properties
CNC machining & beveling
Non-destructive testing (NDT)
Hydrostatic testing
Complete traceability with test certificates (MTCs)
We adhere to global standards like ASME B16.9, ASTM A234, IS 1239, and EN 10253.
Applications Across Industries
Fortis Forge Buttweld Caps are widely used in:
Oil & Gas Pipelines
Petrochemical Plants & Refineries
Power Plants (Thermal, Nuclear, Renewable)
Marine & Shipbuilding
Water Treatment & Filtration Systems
Firefighting & HVAC Piping Networks
They are essential for temporary pipe closure during maintenance, pressure testing, or system isolation.
Why Choose Fortis Forge?
High-quality materials with certified traceability (MTCs)
In-house quality control & dimensional checks
Expert fabrication and precision machining
On-time global delivery and logistics support
Custom solutions for special sizes and thicknesses
Buttweld Caps – Carbon Steel Pipe End Caps, Mild Steel Pipe Caps, ASTM A234 WPB Caps, ASME B16.9 End Cap Fittings, High Pressure CS/MS Buttweld Caps, Hemispherical, Ellipsoidal & Torispherical Caps Manufacturer in India
As a leading manufacturer of Buttweld Caps, Fortis Forge is committed to delivering high-quality pipe end fittings that meet stringent international standards. Our manufacturing process includes precision forming, seamless or welded construction, and rigorous quality checks to ensure each cap offers leak-proof sealing, dimensional precision, and long-term durability. In India’s competitive market for buttweld fittings, our emphasis on product integrity, customization, and customer satisfaction sets us apart.
When selecting Buttweld Caps for your piping systems, it is important to consider the type (hemispherical, ellipsoidal, torispherical), size, material grade, and pressure class. These caps are used to permanently or temporarily close the ends of pipes, helping to ensure pressure retention, structural protection, and cleanliness within systems. Our buttweld caps are commonly installed in pipelines for oil & gas, petrochemicals, water treatment, marine, and construction applications.
Available in carbon steel and mild steel (ASTM A234 WPB, IS 2062), Fortis Forge Buttweld Caps comply with ASME B16.9 and other global specifications. They offer exceptional resistance to corrosion, pressure, and harsh environmental conditions. Whether you require seamless pipe closure or terminal sealing in high-stress systems, Fortis Forge provides reliable and robust buttweld caps engineered for industrial performance.
Buttweld Caps, Carbon Steel Pipe End Caps, Mild Steel Buttweld Caps, ASME B16.9 Pipe Caps, Hemispherical & Ellipsoidal Caps, Pipe End Fittings, Buttweld Cap Manufacturers in India
- Buttweld Caps Specification
| Specifications | ASME B16.9 / MSS SP-43 / EN 10253 |
| Size Range | ½” to 48” (DN15 to DN1200) |
| Types | Hemispherical Cap, Ellipsoidal Cap, Torispherical Cap |
| Wall Thickness | Sch 10S, 20, 40, 80, 160, XS, XXS |
| Material Grades | Carbon Steel (ASTM A234 WPB), Mild Steel (IS 1239 / IS 3589) |
| Standard | ASTM, ASME, ANSI, DIN, EN, JIS, BS |
| Applications | Pipeline Closure, Pressure Vessels, Oil & Gas, Chemical Processing, Power Plants, Water Distribution |
- Buttweld Caps Dimensions
PIPE CAPS – ANSI B16.9 Dimensions
| CAPS – ANSI B16.9 Dimension | |||
|---|---|---|---|
| Inches | mm | Height | |
| D | E | ||
| 1/2 | 15 | 21.34 | 25.40 |
| 3/4 | 20 | 26.67 | 31.75 |
| 25 | 33.40 | 38.10 | |
| 1 1/4 | 32 | 42.16 | 38.10 |
| 1 1/2 | 40 | 48.26 | 38.10 |
| 2 | 50 | 60.32 | 38.10 |
| 2 1/2 | 65 | 73.02 | 38.10 |
| 3 | 80 | 88.90 | 50.80 |
| 3 1/2 | 90 | 101.60 | 63.50 |
| 4 | 100 | 114.30 | 63.50 |
| 5 | 125 | 141.30 | 76.20 |
| 6 | 150 | 168.27 | 88.90 |
| 8 | 200 | 219.07 | 101.60 |
| 10 | 250 | 273.05 | 127.00 |
| 12 | 300 | 323.85 | 152.40 |
| 14 | 350 | 355.60 | 165.10 |
| 16 | 400 | 406.40 | 177.80 |
| 18 | 450 | 457.20 | 203.20 |
| 20 | 500 | 508.00 | 228.60 |
| 22 | 550 | 558.80 | 254.00 |
| 24 | 600 | 609.60 | 266.70 |
| 28 | 700 | 711.20 | 266.70 |
| Dimensions in mm | |||
PIPE CAPS – ANSI B16.9 Tolerances
| DIMENSIONAL TOLERANCES – CAPS | ||||
|---|---|---|---|---|
| For All Fittings | Caps | |||
| NPS | Outside Ø at Bevel | Inside Ø at End | Wall Thickness (t / t1) | Overall Length E |
| 1/2 to 2 1/2 | 1 | 0.8 | Not | 4 |
| 3 to 3 1/2 | 1 | 1.6 | Less | 4 |
| 4 | +2 -1 | 1.6 | Than | 4 |
| 5 to 6 | +3 -1 | 1.6 | 87.5% | 7 |
| 8 | 2 | 1.6 | of nominal | 7 |
| 10 | +4 -3 | 3.2 | Thickness | 7 |
| 12 to 18 | +4 -3 | 3.2 | 7 | |
| 20 to 24 | +6 -5 | 4.8 | 7 | |
| 26 to 30 | +7 -5 | 4.8 | 10 | |
| 32 to 48 | +7 -5 | 4.8 | 10 | |
CAPS – Weights
| NPS (Inches) | CAPS (Approx. Weight in kg) | |||
|---|---|---|---|---|
| Sch. 5S | Sch. 10S | Sch. 40S | Sch. 80S | |
| 1/2 | 0.04 | 0.04 | 0.05 | 0.05 |
| 3/4 | 0.05 | 0.05 | 0.06 | 0.08 |
| 1 | 0.09 | 0.09 | 0.13 | 0.17 |
| 1 1/4 | 0.11 | 0.11 | 0.15 | 0.18 |
| 1 1/2 | 0.15 | 0.15 | 0.20 | 0.22 |
| 2 | 0.17 | 0.17 | 0.25 | 0.30 |
| 2 1/2 | 0.25 | 0.25 | 0.45 | 0.50 |
| 3 | 0.40 | 0.40 | 0.70 | 0.90 |
| 4 | 0.60 | 0.60 | 1.20 | 1.60 |
| 5 | 1.00 | 1.00 | 1.90 | 2.70 |
| 6 | 1.40 | 1.40 | 2.90 | 4.30 |
| 8 | 2.50 | 2.50 | 5.10 | 7.60 |
| 10 | 3.90 | 3.90 | 9.00 | 12.0 |
| 12 | 6.50 | 6.50 | 13.5 | 17.5 |
| 14 | 8.00 | 8.00 | 16.0 | 20.5 |
| 16 | 14.5 | 14.5 | 20.5 | 26.0 |
| 18 | 17.0 | 17.0 | 26.0 | 34.0 |
| 20 | 18.0 | 18.0 | 32.0 | 43.0 |
| 24 | 26.0 | 26.0 | 46.0 | 60.0 |
| Approximate weights in kg, density 8 kg/dm³ | ||||
The Buttweld Cap price can vary depending on size, wall thickness (schedule), material grade, type (hemispherical, ellipsoidal, or torispherical), and order quantity. Typically, the price for carbon steel or mild steel buttweld caps ranges from ₹30 to ₹600 per piece, depending on dimensions and specifications. As a trusted buttweld fittings supplier in India, Fortis Forge offers competitive pricing while upholding a strong focus on precision engineering, sealing performance, and structural integrity.
Our pipe end caps are manufactured in strict compliance with ASME B16.9 and ASTM A234 WPB standards, ensuring full closure of the pipeline with excellent resistance to internal pressure and external corrosion. Designed to permanently or temporarily seal off pipeline ends, our buttweld caps are available in hemispherical, ellipsoidal, and torispherical types to suit varied pressure and service conditions.
Ideal for applications across oil & gas, chemical processing, marine infrastructure, power plants, and water treatment systems, Fortis Forge Buttweld Caps provide a secure and leak-free end to piping systems. Customers across industries trust us for our reliable supply, custom manufacturing capabilities, and adherence to quality and delivery commitments—even in the most demanding operational environments.
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 Buttweld Caps
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
| ASTM A234 WPB | 1.0457 | K03006 | STPA 24 | 360 LT50 | 10 / 20 | NF A 49-215 | P265GH / 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
