ARK Stainless Inc is one of the leading manufacturers and exporters of Buttweld Fittings in India, supplying high-quality industrial pipe fittings for critical piping systems across oil & gas, petrochemical, power generation, chemical processing, marine, pharmaceutical, and infrastructure industries.
We manufacture ASME B16.9 Buttweld Fittings in Stainless Steel, Duplex Steel, Super Duplex Steel, Carbon Steel, Alloy Steel, Nickel Alloy, Inconel, Monel, Hastelloy, Titanium, and Copper Nickel grades. Our range includes long radius elbows, short radius elbows, tees, reducers, stub ends, caps, bends, and custom buttweld pipe fittings in seamless and welded construction.
All Buttweld Fittings are produced using high-quality raw materials and are manufactured according to ASME, ASTM, ANSI, MSS, and DIN standards. Each fitting undergoes strict quality inspection and dimensional checking to ensure accurate fitment, corrosion resistance, pressure handling capability, and long service life in demanding industrial environments.
As a trusted Buttweld Fittings supplier in Mumbai, India, we maintain ready stock for standard sizes and schedules to support urgent project requirements and bulk export orders. We regularly supply industrial pipe fittings to clients in UAE, Saudi Arabia, Qatar, Kuwait, Oman, USA, Europe, and Southeast Asia.
We offer Buttweld Fittings in various wall thicknesses, pressure ratings, and material grades suitable for both low-temperature and high-temperature applications.
ARK Stainless Inc manufactures and supplies a complete range of industrial Buttweld Pipe Fittings including:
These fittings are available in seamless, welded, fabricated, and custom-built configurations as per project requirements.
We manufacture Buttweld Fittings in the following material grades:
Available in ASTM, ASME, and DIN specifications with complete mill test certificates and third-party inspection support.
Our Buttweld Pipe Fittings are widely used in:
ARK Stainless Inc supplies industrial Buttweld Fittings to EPC contractors, pipeline companies, fabrication companies, refineries, process plants, and industrial distributors worldwide. We support both small quantity requirements and large-volume project supply with quick dispatch and reliable export documentation.
For latest price, technical details, or bulk inquiries, contact our sales team for immediate quotation support.
| Material | Standard | Available Grades | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | ||
| Stainless Steel | ASTM A403 WP | 304 | 304H | 309 | 310 | 316 | 316L | 317L | 321 | 347 | 904L |
| Alloy Steel | ASTM / ASME A/SA 234 | WP1 | WP11 | WP12 | WP22 | WP91 | WP5 | WP9 | |||
| Carbon Steel | ASTM A234 | WPB | WPBW | WPHY 42 | WPHY 46 | WPHY 52 | WPHY 60 | WPHY 65 | WPHY 70 | ||
| High Nickel Alloys | ASTM B163 / B333 / B622 | Nickel 200 | Nickel 201 | Alloy 20 | Incoloy 800 | Incoloy 825 | Monel 400 | Monel K500 | Hastelloy C276 | Hastelloy C22 | |
| Titanium | ASTM B348 / B381 | Grade 1 | Grade 2 | Grade 5 | Grade 7 | ||||||
| Monel | ASTM B564 / B865 | Monel 400 | Monel K500 | ||||||||
| Hastelloy | ASTM B622 / B619 | C22 | C276 | B2 | Hastelloy X | ||||||
| Duplex & Super Duplex | ASTM A815 / ASME SA 815 | Duplex 2205 | Duplex 2304 | Super Duplex 2507 | |||||||
| Inconel | ASTM B163 / B167 / B564 | 600 | 601 | 625 | 718 | 800 | 825 | ||||
| Aluminum | ASTM B209 / B221 | 1100 | 2011 | 2014 | 2024 | 3003 | 5052 | 6061 | 6063 | 7075 | |
| Material | Grades | Size Range (NPS) | Wall Thickness (mm) | Weight per Meter (kg) | Chemical Composition (%) | ||||
|---|---|---|---|---|---|---|---|---|---|
| C | Mn | Cr | Ni | Other | |||||
| Stainless Steel | 304, 304L, 316, 316L | ½” - 24” | 2.77 - 15.88 | 1.27 - 150.30 | =0.08 | 2.00 | 18-20 | 8-10.5 | Si: 1.00 |
| 321, 347, 317L | ½” - 24” | 3.18 - 14.27 | 1.55 - 145.20 | =0.08 | 2.00 | 17-19 | 9-13 | Si: 1.00 | |
| Carbon Steel | ASTM A234 WPB, WPC | ½” - 48” | 2.77 - 20.62 | 1.45 - 320.80 | =0.30 | 1.00 | - | - | Fe: Balance |
| ASTM A860 WPHY 42-70 | ½” - 48” | 3.18 - 22.23 | 1.98 - 410.35 | =0.12 | 1.10-1.40 | =0.50 | =0.50 | - | |
| Duplex Steel | UNS S31803, S32205 | ½” - 36” | 3.91 - 15.88 | 2.10 - 180.75 | =0.03 | 2.00 | 21-23 | 4.5-6.5 | Mo: 2.5-3.5 |
| Super Duplex Steel | UNS S32750, S32760 | ½” - 36” | 3.91 - 20.00 | 2.20 - 195.60 | =0.03 | 1.20 | 24-26 | 6-8 | Mo: 3-4.5 |
| Nickel Alloy | 200, 201 | ½” - 30” | 2.77 - 14.27 | 1.60 - 122.50 | =0.15 | 0.35 | - | 99.0 | Fe: Balance |
| Monel 400, K500 | ½” - 30” | 2.90 - 15.88 | 1.90 - 130.45 | =0.30 | 2.00 | - | Balance | Cu: 28-34 | |
| Titanium Alloy | Gr.1, Gr.2, Gr.5, Gr.7 | ½” - 24” | 3.18 - 10.31 | 2.10 - 85.45 | =0.08 | - | - | 99.2 | Mn: 0.03, Si: 0.15 |
| Cupro-Nickel Alloy | 90/10, 70/30 | ½” - 36” | 2.77 - 12.70 | 1.85 - 98.60 | =0.10 | 1.00 | - | 9-11 | Cu: 88 |
| Fitting Type | Size (Inch) | Dimensions (mm) | Wall Thickness (SCH 40) | Standard | |
|---|---|---|---|---|---|
| Outer Diameter (OD) | Center-to-End (C) | ||||
| Elbow 90° | 1/2" | 21.3 | 38 | 2.77 | ASME B16.9 |
| 3/4" | 26.7 | 38 | 2.87 | ||
| 1" | 33.4 | 38 | 3.38 | ||
| Elbow 45° | 1/2" | 21.3 | 16 | 2.77 | ASME B16.9 |
| 3/4" | 26.7 | 22 | 2.87 | ||
| 1" | 33.4 | 25 | 3.38 | ||
| Tee | 1/2" | 21.3 | 25 | 2.77 | ASME B16.9 |
| 3/4" | 26.7 | 29 | 2.87 | ||
| 1" | 33.4 | 38 | 3.38 | ||
| Reducer | 1/2" x 3/8" | 21.3 x 17.1 | 25 | 2.77 | ASME B16.9 |
| 3/4" x 1/2" | 26.7 x 21.3 | 29 | 2.87 | ||
| 1" x 3/4" | 33.4 x 26.7 | 38 | 3.38 | ||
| End Cap | 1/2" | 21.3 | 25 | 2.77 | ASME B16.9 |
| 3/4" | 26.7 | 29 | 2.87 | ||
| 1" | 33.4 | 38 | 3.38 | ||
| Material | Grade | Pressure-Temperature Ratings (PSI) | Standard | ||||
|---|---|---|---|---|---|---|---|
| -20°F to 100°F | 200°F | 400°F | 600°F | 800°F | |||
| Stainless Steel | ASTM A403 WP304 | 150 | 125 | 110 | 95 | 80 | ASME B16.5 |
| ASTM A403 WP316 | 160 | 135 | 120 | 100 | 85 | ||
| ASTM A403 WP321 | 155 | 130 | 115 | 98 | 82 | ||
| ASTM A403 WP347 | 158 | 132 | 118 | 99 | 83 | ||
| Carbon Steel | ASTM A234 WPB | 140 | 120 | 100 | 85 | 70 | ASME B16.9 |
| ASTM A234 WPC | 145 | 123 | 103 | 87 | 72 | ||
| ASTM A420 WPL6 | 150 | 127 | 107 | 90 | 75 | ||
| ASTM A860 WPHY52 | 170 | 140 | 120 | 100 | 85 | ||
| Duplex Steel | ASTM A815 UNS S31803 | 180 | 150 | 130 | 110 | 95 | ASME B16.9 |
| ASTM A815 UNS S32205 | 190 | 160 | 140 | 115 | 100 | ||
| ASTM A815 UNS S32750 | 200 | 170 | 150 | 125 | 110 | ||
| Nickel Alloy | ASTM B366 UNS N06600 | 210 | 180 | 160 | 140 | 120 | ASME B16.9 |
| ASTM B366 UNS N08825 | 220 | 190 | 170 | 150 | 130 | ||
| ASTM B366 UNS N10276 | 230 | 200 | 180 | 160 | 140 | ||
| Material | Grade | Dimensional Tolerances (mm) | Wall Thickness Tolerances (%) | Standard | ||||
|---|---|---|---|---|---|---|---|---|
| OD (Outer Diameter) | ID (Inner Diameter) | Length | Min | Max | Average | |||
| Stainless Steel | ASTM A403 WP304 | ±0.5 | ±0.4 | ±1.0 | -12.5% | +12.5% | ±10% | ASME B16.9 |
| ASTM A403 WP316 | ±0.6 | ±0.5 | ±1.2 | -12.5% | +12.5% | ±10% | ||
| ASTM A403 WP321 | ±0.7 | ±0.6 | ±1.5 | -10% | +10% | ±8% | ||
| ASTM A403 WP347 | ±0.8 | ±0.7 | ±1.8 | -10% | +10% | ±8% | ||
| Carbon Steel | ASTM A234 WPB | ±0.5 | ±0.3 | ±1.0 | -12.5% | +12.5% | ±10% | ASME B16.9 |
| ASTM A234 WPC | ±0.6 | ±0.4 | ±1.2 | -12.5% | +12.5% | ±10% | ||
| ASTM A420 WPL6 | ±0.7 | ±0.5 | ±1.4 | -12.5% | +12.5% | ±10% | ||
| Duplex Steel | ASTM A815 UNS S31803 | ±0.6 | ±0.4 | ±1.2 | -10% | +10% | ±8% | ASME B16.9 |
| ASTM A815 UNS S32205 | ±0.7 | ±0.5 | ±1.5 | -10% | +10% | ±8% | ||
| ASTM A815 UNS S32750 | ±0.8 | ±0.6 | ±1.8 | -8% | +8% | ±7% | ||
| Nickel Alloy | ASTM B366 UNS N06600 | ±0.5 | ±0.3 | ±1.0 | -12.5% | +12.5% | ±10% | ASME B16.9 |
| ASTM B366 UNS N08825 | ±0.6 | ±0.4 | ±1.2 | -10% | +10% | ±8% | ||
| ASTM B366 UNS N10276 | ±0.7 | ±0.5 | ±1.4 | -8% | +8% | ±7% | ||
Buttweld pipe fittings are widely used in various industries due to their high strength, durability, and leak-proof connections. Some of the key applications include:
Used in pipelines for transporting crude oil, natural gas, and petroleum products.
Essential for processing plants handling chemicals, fuels, and hydrocarbons.
Applied in thermal, nuclear, and renewable energy sectors for steam and fluid transportation.
Used in desalination and purification plants to ensure corrosion-resistant piping.
Ensures hygienic and contamination-free fluid transportation.
Stainless steel buttweld fittings are preferred for their hygienic and corrosion-resistant properties.
Used for seawater pipelines, ballast systems, and offshore drilling.
Essential for underground and overhead pipeline networks in cities.
The manufacturing process of buttweld fittings involves several precise steps to ensure strength, durability, and compliance with industry standards. The process includes cutting, heating, forming, machining, and testing to produce high-quality fittings.
High-quality seamless or welded pipes are selected based on material specifications such as stainless steel, carbon steel, duplex steel, nickel alloys, etc.
Pipes are cut into specific lengths using band saw cutting, plasma cutting, or water jet cutting to match the required fitting size.
The cut pipe is heated in a furnace to a specific temperature and formed into elbows, tees, reducers, or caps using hydraulic presses or induction bending.
Annealing or normalizing is done to enhance mechanical properties, relieve stress, and improve corrosion resistance.
CNC machining, grinding, and beveling are performed to achieve precise dimensions, smooth surfaces, and proper welding end preparation.
Non-destructive testing (NDT), ultrasonic testing (UT), hydrostatic testing, and positive material identification (PMI) are conducted to ensure quality.
Pickling & passivation for stainless steel and galvanization or epoxy coating for carbon steel to improve corrosion resistance.
Fittings are packed securely, labeled with material specifications, and shipped to customers ensuring safe handling and delivery.
Elbow Buttweld Fittings are used to change the direction of flow in industrial piping systems. These fittings are manufactured in 45 Degree, 90 Degree, and 180 Degree configurations for low, medium, and high-pressure applications.
ARK Stainless Inc manufactures long radius and short radius buttweld elbows in seamless and welded construction according to ASME B16.9 standards. Our elbows are available in Stainless Steel, Duplex Steel, Super Duplex Steel, Carbon Steel, Alloy Steel, Inconel, Monel, Hastelloy, Titanium, and Nickel Alloy grades.
These fittings are widely used in oil & gas pipelines, refineries, petrochemical plants, power plants, marine piping systems, and process industries where strength, corrosion resistance, and leak-proof performance are critical.
| Nominal Pipe Size (NPS) | Outside Diameter (OD) | Center-to-End (90° Elbow) (A) | Center-to-End (45° Elbow) (B) | Center-to-Center (180° Elbow) (C) |
|---|---|---|---|---|
| 1/2" | 21.3 mm | 38 mm | 16 mm | 76 mm |
| 3/4" | 26.7 mm | 38 mm | 19 mm | 76 mm |
| 1" | 33.4 mm | 38 mm | 22 mm | 76 mm |
| 1 1/4" | 42.2 mm | 48 mm | 25 mm | 95 mm |
| 1 1/2" | 48.3 mm | 57 mm | 29 mm | 114 mm |
| 2" | 60.3 mm | 76 mm | 35 mm | 152 mm |
| 3" | 88.9 mm | 114 mm | 51 mm | 229 mm |
| 4" | 114.3 mm | 152 mm | 64 mm | 305 mm |
| 6" | 168.3 mm | 229 mm | 95 mm | 457 mm |
| 8" | 219.1 mm | 305 mm | 127 mm | 610 mm |
Tee Buttweld Fittings are used for branch connections in industrial piping systems where flow distribution or diversion is required. These fittings are manufactured in Equal Tee and Reducing Tee configurations, depending on pipeline size and process requirements.
ARK Stainless Inc manufactures ASME B16.9 Buttweld Tees in seamless and welded construction for high-pressure and high-temperature piping applications. Our manufacturing range includes Stainless Steel, Duplex Steel, Super Duplex Steel, Carbon Steel, Alloy Steel, Inconel, Monel, Hastelloy, Titanium, and Nickel Alloy grades.
Equal Tees are used where all three pipe outlets are of the same size, while Reducing Tees are used when branch outlet size differs from the main pipeline. These fittings are widely supplied for refineries, chemical plants, power generation units, offshore piping, water treatment facilities, and process industries.
| Nominal Pipe Size (NPS) | Outside Diameter (OD) | Center-to-End (A) | Center-to-End (B) | Wall Thickness (SCH 40) |
|---|---|---|---|---|
| 1/2" | 21.3 mm | 25 mm | 25 mm | 2.77 mm |
| 3/4" | 26.7 mm | 29 mm | 29 mm | 2.87 mm |
| 1" | 33.4 mm | 38 mm | 38 mm | 3.38 mm |
| 1 1/4" | 42.2 mm | 48 mm | 48 mm | 3.56 mm |
| 1 1/2" | 48.3 mm | 57 mm | 57 mm | 3.68 mm |
| 2" | 60.3 mm | 64 mm | 64 mm | 3.91 mm |
| 3" | 88.9 mm | 76 mm | 76 mm | 5.49 mm |
| 4" | 114.3 mm | 95 mm | 95 mm | 6.02 mm |
| 6" | 168.3 mm | 143 mm | 143 mm | 7.11 mm |
| 8" | 219.1 mm | 191 mm | 191 mm | 8.18 mm |
Cross Buttweld Fittings are manufactured for piping systems requiring four-way flow distribution from a common connection point. These fittings are supplied in Equal Cross and Reducing Cross configurations depending on pipeline size and branch outlet requirements.
ARK Stainless Inc manufactures Buttweld Cross Fittings in Stainless Steel, Duplex Steel, Carbon Steel, Alloy Steel, Inconel, Monel, Hastelloy, Titanium, and Nickel Alloy grades according to ASME B16.9 and MSS SP standards.
Equal Cross fittings are used where all four openings are of the same pipe size, while Reducing Cross fittings are used for branch line size reduction within process piping systems. These fittings are commonly supplied for chemical plants, fire protection systems, offshore piping, water treatment facilities, and high-pressure industrial applications.
| Nominal Pipe Size (NPS) | Outside Diameter (OD) | Center-to-End (A) | Center-to-End (B) | Wall Thickness (SCH 40) |
|---|---|---|---|---|
| 1/2" | 21.3 mm | 25 mm | 25 mm | 2.77 mm |
| 3/4" | 26.7 mm | 29 mm | 29 mm | 2.87 mm |
| 1" | 33.4 mm | 38 mm | 38 mm | 3.38 mm |
| 1 1/4" | 42.2 mm | 48 mm | 48 mm | 3.56 mm |
| 1 1/2" | 48.3 mm | 57 mm | 57 mm | 3.68 mm |
| 2" | 60.3 mm | 64 mm | 64 mm | 3.91 mm |
| 3" | 88.9 mm | 76 mm | 76 mm | 5.49 mm |
| 4" | 114.3 mm | 95 mm | 95 mm | 6.02 mm |
| 6" | 168.3 mm | 143 mm | 143 mm | 7.11 mm |
| 8" | 219.1 mm | 191 mm | 191 mm | 8.18 mm |
Pipe Caps are manufactured to close pipeline ends in industrial piping systems during permanent installation or temporary shutdown applications. These Buttweld Caps are widely supplied for process piping, pressure vessels, chemical plants, oil & gas pipelines, and power generation systems where secure end closure is required.
ARK Stainless Inc manufactures ASME B16.9 Buttweld Pipe Caps in seamless and welded construction using Stainless Steel, Duplex Steel, Super Duplex Steel, Carbon Steel, Alloy Steel, Inconel, Monel, Hastelloy, Titanium, and Nickel Alloy materials.
Our Pipe End Caps are produced with accurate wall thickness, smooth finishing, and proper bevel preparation for easy welding and reliable fit-up in high-pressure piping systems.
| Nominal Pipe Size (NPS) | Outside Diameter (OD) | End Cap Height (H) | Wall Thickness (SCH 40) |
|---|---|---|---|
| 1/2" | 21.3 mm | 25 mm | 2.77 mm |
| 3/4" | 26.7 mm | 29 mm | 2.87 mm |
| 1" | 33.4 mm | 38 mm | 3.38 mm |
| 1 1/2" | 48.3 mm | 57 mm | 3.68 mm |
| 2" | 60.3 mm | 64 mm | 3.91 mm |
| 3" | 88.9 mm | 76 mm | 5.49 mm |
| 4" | 114.3 mm | 95 mm | 6.02 mm |
| 6" | 168.3 mm | 143 mm | 7.11 mm |
| 8" | 219.1 mm | 191 mm | 8.18 mm |
| 10" | 273.0 mm | 229 mm | 9.27 mm |
| 12" | 323.9 mm | 267 mm | 9.52 mm |
Stub End Buttweld Fittings are manufactured for lap joint flange connections in piping systems requiring frequent dismantling, inspection, or maintenance access. These fittings allow easy flange rotation and alignment during installation, especially in large-diameter and low-pressure piping systems.
ARK Stainless Inc manufactures Lap Joint Stub Ends in short pattern and long pattern designs according to ASME B16.9 standards. Our manufacturing range includes Stainless Steel, Duplex Steel, Super Duplex Steel, Carbon Steel, Alloy Steel, Inconel, Monel, Hastelloy, Titanium, and Nickel Alloy grades.
Stub Ends are widely supplied for chemical processing plants, water treatment systems, food processing units, pharmaceutical piping, and process industries where quick assembly and flange alignment are important.
| Nominal Pipe Size (NPS) | Outside Diameter (OD) | Stub End Length (Long Pattern) | Stub End Length (Short Pattern) | Lap Diameter |
|---|---|---|---|---|
| 1/2" | 21.3 mm | 57 mm | 32 mm | 34 mm |
| 3/4" | 26.7 mm | 59 mm | 35 mm | 42 mm |
| 1" | 33.4 mm | 64 mm | 38 mm | 51 mm |
| 1 1/2" | 48.3 mm | 76 mm | 44 mm | 73 mm |
| 2" | 60.3 mm | 89 mm | 51 mm | 92 mm |
| 3" | 88.9 mm | 108 mm | 64 mm | 127 mm |
| 4" | 114.3 mm | 140 mm | 76 mm | 157 mm |
| 6" | 168.3 mm | 178 mm | 89 mm | 219 mm |
| 8" | 219.1 mm | 203 mm | 102 mm | 273 mm |
ARK Stainless Inc manufactures and supplies Swage Nipples and Pipe Nipples for industrial piping systems requiring pipe extension, size reduction, and threaded connections. These fittings are available in Stainless Steel, Carbon Steel, Alloy Steel, Duplex Steel, Inconel, Monel, Hastelloy, Titanium, and Nickel Alloy grades.
Swage Nipples are supplied in concentric and eccentric designs for reducing pipe sizes within high-pressure process piping systems. Pipe Nipples are manufactured with threaded ends for connecting valves, fittings, and pipe sections in industrial utility lines and general piping applications.
Our manufacturing range includes seamless and welded construction in multiple schedules, lengths, and end connection types according to ASME and ASTM standards.
| Nominal Pipe Size (NPS) | Pipe Nipple Length | Swage Nipple Large End | Swage Nipple Small End | Thread Type |
|---|---|---|---|---|
| 1/2" | 50 mm - 150 mm | 21.3 mm | 15 mm | NPT / BSP |
| 3/4" | 60 mm - 200 mm | 26.7 mm | 21.3 mm | NPT / BSP |
| 1" | 75 mm - 250 mm | 33.4 mm | 26.7 mm | NPT / BSP |
| 1 1/2" | 100 mm - 300 mm | 48.3 mm | 33.4 mm | NPT / BSP |
| 2" | 125 mm - 400 mm | 60.3 mm | 48.3 mm | NPT / BSP |
| 3" | 150 mm - 500 mm | 88.9 mm | 60.3 mm | NPT / BSP |
