ASME B16.11 Threaded & Socket Weld
ASME B16.11 Boss: Dimensions | Specifications | Material Grade | About Forged Boss | All Product Types
Forged pipe bosses are precision-engineered fittings used to reinforce branch connections in high-pressure piping systems. These components are typically welded or threaded into the pipe wall to create a robust and leak-proof outlet for instrumentation, valves, or secondary lines. Manufactured in compliance with MSS SP-97, ASME B16.11, and other global standards, our forged bosses are widely used in sectors like oil & gas, petrochemical, marine, power generation, and refining.
Nutech offers a full range of forged bosses including Threaded Boss, Socket Weld Boss, Plain/Butt Weld Boss, Flat Face Boss, Raised Face Boss, and Extended Boss—each precisely machined and available in pressure ratings of 3000#, 6000#, and 9000#. Whether your requirement is for NPT or BSP threaded outlets, butt-weld reinforcements, or extended-length bosses for specific engineering needs, we deliver consistent quality and dimensional accuracy.
Our forged bosses are available in materials such as Carbon Steel A105 / A350 LF2, Stainless Steel A182 F304/L, F316/L, F321/H, Alloy Steel F5, F9, F22, and high-performance alloys including Duplex Steel F51 / F60, Super Duplex F53 / F55, Inconel, Monel, Hastelloy, and Copper Nickel 70/30 & 90/10. Custom machining, surface finish options, and marking as per client specifications are available upon request.
Every fitting is tested under strict quality control processes to ensure corrosion resistance, pressure integrity, and dimensional tolerance, making them suitable for critical service environments.
For complete technical details, including dimensions, pressure ratings, weight charts, and material specifications of our Socket Weld and Threaded Pipe Boss, please download the full Catalog PDF below.
Specification | Details |
---|---|
Product Name | Forged Pipe Boss / Reinforcing Boss |
Standard | ASME B16.11, ANSI B16.11, MSS-SP-79, MSS-SP-83, MSS-SP-95, MSS-SP-97, BS 3799 |
Connection Type | Threaded (NPT/BSP), Socket Weld, Butt Weld |
Size Range | ¼" to 4" (DN 6 to DN 100) |
Pressure Class | Class 2000 / 3000 / 6000 / 9000 LBS |
Types Available | Threaded Boss, Socket Weld Boss, Plain/Butt Weld Boss, Flat Face Boss, Raised Face Boss, Extended Boss |
Face Types | Flat Face (FF), Raised Face (RF) |
Design & Construction | Forged, Heat Treated, Precision Machined |
Testing & Certification | 100% Pressure Tested, PMI, IGC, NACE MR0175, MTC as per EN 10204 3.1/3.2 |
Application Industries | Oil & Gas, Construction, Ship Building, Power Plants, Petrochemical, Pharmaceutical, Water Treatment, Automobile, Chemical, Pulp & Paper |
Origin | Made in India (by Nutech Overseas) |
Export Network | USA, Europe, and Middle East |
Material | Grades / Standards / UNS Numbers |
---|---|
Stainless Steel Bosses | ASTM A182 F304 / F304L, F316 / F316L, F310, F321 / F321H, F347 / F347H, SS 904L, DIN 1.4301, 1.4306, 1.4401, 1.4404 |
Carbon Steel Bosses | ASTM A105, ASTM A106 Gr B, ASTM A234 WPB, ASTM A350 LF2 CL.1, MSS-SP-75 WPHY 42, WPHY 46, WPHY 52, WPHY 60, WPHY 65, WPHY 70 |
Low Temperature Carbon Steel Bosses | ASTM A420 WPL3, ASTM A420 WPL6 |
Alloy Steel Bosses | ASTM A182 F1, F5, F9, F11, F12, F22, F91, ASTM A234 WP1, WP5, WP9, WP11, WP22, WP91 |
Duplex Steel Bosses | ASTM A815 UNS S31803, S32205, Werkstoff No. 1.4462 |
Super Duplex Steel Bosses | ASTM A815 UNS S32750, S32760, S32950 |
Nickel Alloys Bosses | Nickel 200 (UNS N02200), Nickel 201 (UNS N02201), Inconel 600 (UNS N06600), 601 (UNS N06601), 625 (UNS N06625), 800 (UNS N08800), 825 (UNS N08825), Monel 400 (UNS N04400), Monel K500 (UNS N05500), Hastelloy C276 (UNS N10276), Hastelloy C22 (UNS N06022), Alloy 20 (UNS N08020), Nimonic 75 / 90 |
Copper Nickel Bosses | Cu-Ni 90/10 (C70600), Cu-Ni 70/30 (C71500), CuNi10Fe1Mn, CuNi30Mn1Fe |
Titanium Bosses | Grade 1, Grade 2, ASTM B381 |
Aluminium Bosses | ASTM B361, Aluminium 6061, 6082, 7075 |
Brass Bosses | ASTM B62, C23000, C26000 |
Bronze Bosses | Tin Bronze, Aluminium Bronze (C95400), Leaded Bronze (C93200), ASTM B148 |
254 SMO Bosses | UNS S31254, ASTM A182 F44 |
Definition and Purpose:
A forged boss fitting is a forged pipe accessory designed to provide a secure branch connection or nozzle on high-pressure piping systems. It acts as a reinforced outlet for instrumentation, valves, or auxiliary piping, ensuring reliable system access without compromising pipe integrity.
Manufacturing Process:
Produced by forging solid metal billets, these bosses undergo heat treatment and precision machining to enhance mechanical strength and dimensional accuracy. Forging improves the grain structure, resulting in superior toughness and pressure resistance compared to cast or fabricated alternatives.
Types and Connection Methods:
Forged bosses are available in several types, including threaded boss, socket weld boss, plain (butt) weld boss, flat face boss, raised face boss, and extended boss. They can be attached to pipes via socket weld, butt weld, or threaded connections depending on application requirements.
Standards and Pressure Classes:
These fittings conform to internationally recognized standards such as MSS SP-97 and ASME B16.11. They are designed to operate efficiently across pressure classes ranging from 3000# to 9000#, ensuring compatibility with diverse industrial piping systems.
Applications:
Commonly utilized in oil & gas, petrochemical, power generation, marine, and chemical industries, forged bosses are ideal for high-temperature and high-pressure conditions where safety, durability, and leak-tight performance are critical.
Stringent Quality Control:
Forged boss fittings undergo rigorous quality assurance protocols to meet the demanding requirements of high-pressure piping systems. The manufacturing process includes multiple inspections such as dimensional checks, visual examinations, and surface finish assessments to ensure compliance with design specifications.
Material Verification and Testing:
Each forged boss is tested for chemical composition and mechanical properties to guarantee material integrity. Techniques like Positive Material Identification (PMI), hardness testing, and tensile strength evaluation are standard procedures. These tests confirm conformity with the specified grades of carbon steel, stainless steel, alloy steel, and duplex materials.
Non-Destructive Testing (NDT):
To detect internal and surface defects, forged bosses are subjected to non-destructive testing methods such as ultrasonic testing (UT), radiographic testing (RT), magnetic particle inspection (MPI), and dye penetrant testing (DPT). These NDT techniques help ensure the reliability and safety of the fittings under operational stresses.
Certifications:
Forged bosses are manufactured in compliance with globally recognized standards including ASME B16.11, MSS SP-97, and BS 3799. ISO 9001 certification of the manufacturing facility ensures consistent quality management practices. Additionally, certifications such as PED (Pressure Equipment Directive) and API (American Petroleum Institute) may be provided based on customer requirements and regional regulations.
Traceability and Documentation:
Complete traceability is maintained for every forged boss, including mill test certificates (MTC), material test reports (MTR), and inspection certificates. These documents provide transparency and assurance about the product’s origin, quality, and compliance with industry standards.
Protective Packaging:
Forged boss fittings are carefully packaged to prevent damage during transportation and storage. Standard packaging includes wooden crates, sturdy cartons, or palletized packing with protective cushioning such as foam or bubble wrap. This ensures protection against mechanical impacts, corrosion, and environmental exposure.
Customized Packaging Solutions:
Depending on customer requirements and shipment destination, customized packaging options are available. This may include weatherproof wrapping, anti-rust coatings, or vacuum sealing to preserve product integrity during long transit times or harsh climatic conditions.
Labeling and Documentation:
Each package is clearly labeled with product identification, batch numbers, and relevant handling instructions. Shipping documents such as packing lists, certificates of conformity, and customs paperwork are included to facilitate smooth import and export processes.
Shipping and Delivery:
Forged bosses can be shipped worldwide via air, sea, or land freight. Delivery schedules and logistics are tailored based on order volume, urgency, and destination. Reliable logistics partners ensure timely and safe delivery to ports, warehouses, or project sites.
Bulk and Small Order Flexibility:
Both bulk and small quantity orders are accommodated with efficient packaging and consolidated shipping solutions to optimize cost-effectiveness without compromising product safety.
Threaded Boss:
This type features internal threads allowing direct connection to threaded pipes or instrumentation. It’s ideal for applications requiring easy assembly and disassembly without welding.
Socket Weld Boss:
Designed with a socket to insert the pipe, this boss type is welded around the socket, offering a strong, leak-proof joint suitable for high-pressure systems.
Plain (Butt) Weld Boss:
With a plain end, this boss is welded directly to the pipe using butt welding, providing excellent strength and durability, commonly used in critical pipeline sections.
Flat Face Boss:
Characterized by a flat sealing surface, this boss facilitates easy mating with flat-faced flanges or equipment, often used where surface contact is essential.
Raised Face Boss:
Features a raised sealing surface for improved gasket sealing and pressure containment, making it suitable for high-pressure and high-temperature applications.
Extended Boss:
This variant has an extended neck length, providing extra clearance or flexibility for connecting instruments or auxiliary piping in complex piping layouts.
Our global logistics network ensures timely deliveries, adherence to regional certifications, and compliance with international trade regulations, making us a trusted supplier worldwide.
Forged boss fittings offer numerous advantages compared to cast or fabricated fittings. Their forged manufacturing process refines the metal structure, resulting in enhanced strength, toughness, and resistance to impact and fatigue. This makes them highly reliable for high-pressure and high-temperature environments. Forged bosses also exhibit superior dimensional accuracy and uniformity, ensuring excellent fit-up and reducing the risk of leaks. Additionally, they provide better corrosion resistance when made from appropriate alloy grades like stainless steel, duplex, or super duplex. These benefits translate into longer service life, reduced maintenance costs, and improved safety in critical piping applications.