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Threaded pipe fittings are forged components designed to be screwed onto the ends of pipes or other fittings, creating secure and leak-proof connections in high-pressure piping systems. | |
Types & Applications | Elbows: 90° Elbow, 45° Elbow, Street Elbow |
Tees: Tee, 45° Lateral Tee, Cross | |
Couplings: Full Coupling, Half Coupling, Reducing Coupling, Couplet | |
Caps & Plugs: Cap, Square Head Plug, Round Head Plug, Bull Plug, Hex Head Plug | |
Bushings & Nipples: Hex Head Bushing, Boss, Hex Nipple, Pipe Nipple, Concentric/Eccentric Swage Nipple | |
Unions & Adapters: Threaded Union, Union Male x Female, Union Male x SW, Threaded Adapter | |
Branch Outlets: 90° Branch Outlet, 45° Branch Outlet, 90° Elbow Outlet, Nipple Branch Outlet | |
Materials | Stainless Steel & Alloy: ASTM A182 (F304, F304L, F316, F316L, F304H, F316H, F317L, F321, F11, F22, F91) |
Carbon Steel & Others: ASTM A105, A350 LF2, A106 Gr.B, A234 WPB, A312, A403 | |
Standards & Dimensions | ASME B16.11, MSS SP-79, 83, 95, 97, BS3799 |
Pressure Ratings | 2000 LBS, 3000 LBS, 6000 LBS |
Size Range | NPS 1/8" ~ 4" (DN6 ~ DN100) |
Our threaded pipe fittings are widely used in oil & gas, petrochemical, power, shipbuilding, and industrial piping systems, providing reliable performance, durability, and safety under high-pressure conditions. | |
The company possesses an experienced R&D team capable of designing and manufacturing precision screws of various specifications according to customer needs.
If you have any questions or requirements regarding portable outdoor power solutions, please feel free to contact our customer service team. Our professional team will provide you with detailed product information, answer your questions, and tailor the best solution to meet your needs.
Mob：+86-18833207623
E-mail：inquiry@maitoleadfitting.com
At MaitoLead Group, we strictly control every step of the production process to ensure our pipe fittings meet the highest international standards (ASME, DIN, JIS). Our comprehensive manufacturing workflow guarantees precision, durability, and reliability for every product.
Quality begins at the source. Upon arrival, all raw materials (steel bars/billets) undergo strict chemical composition and mechanical property testing to ensure they meet specific grade requirements (e.g., ASTM A105, SS304/316) before entering the warehouse.
Using advanced CNC band sawing machines (such as the SGT-330Z shown), we precisely cut raw materials into specific weights and lengths. This automated process minimizes material waste and ensures consistency for the subsequent forging stage.
The cut billets are heated to optimal temperatures in industrial furnaces to achieve high plasticity. They are then forged under high pressure. This forging process refines the internal grain structure of the metal, significantly enhancing the strength and impact resistance of the fittings compared to casting.
After forging, the rough parts move to our precision machining workshop. Using CNC lathes and drilling equipment, we machine the outer diameter, inner bore, bevel ends, and threads to exact tolerances defined by ASME B16.9 or B16.11 standards.
To achieve the required mechanical properties, the machined fittings undergo specific heat treatment processes (such as normalizing, quenching, tempering, or solution annealing). This step eliminates internal stresses and optimizes hardness and toughness.
Our Quality Control (QC) team conducts rigorous dimensional checks and visual inspections. We verify wall thickness, diameter, angles (45°/90°), and surface finish to ensure zero defects before the products proceed to surface treatment.
For stainless steel fittings, we perform pickling to remove scale and oxidation from the forging and heat treatment process. This is followed by passivation to form a protective oxide layer, maximizing corrosion resistance and ensuring a clean, uniform silver-white finish.
Finally, the finished products are carefully packed in plywood cases or pallets according to export standards. Each package is clearly marked with material grades, sizes, and heat numbers for full traceability, ready for global shipment.
At MaitoLead, quality is not just a promise; it is a verified standard. We implement a comprehensive inspection protocol for every batch of pipe fittings to ensure they meet strict international standards like ASME B16.11 and ASTM specifications. Our "Zero Defect" policy ensures that only flawless products reach your project site.
Using high-precision calipers and micrometers, our QC team meticulously checks critical dimensions including outer diameter, wall thickness, and center-to-end length. This ensures perfect fit-up during on-site installation and welding.
For threaded fittings (NPT, BSPT, BSPP), we perform 100% thread verification using standardized Go/No-Go ring gauges and plug gauges. As seen in our testing workshop, this step guarantees that threads are free from defects and will seal tightly under high pressure without leakage.
Every fitting undergoes a strict visual check to ensure the surface is free from cracks, scars, heavy pitting, or forging laps. We also verify that the pickling and passivation process has been correctly applied to stainless steel products to maximize corrosion resistance.
We maintain full traceability for all products. Each batch is cross-referenced with Mill Test Certificates (MTC) to confirm chemical composition and mechanical properties match the ordered grade (e.g., A105, SS316L).
Maitolead Group – Professional Manufacturer of High-Pressure Forged Fittings
Maitolead Group specializes in the production and supply of high-pressure forged pipe fittings, including both threaded and socket welded types. Our threaded fittings are manufactured in collaboration with several long-term partner factories, ensuring consistent quality and precision across every stage of forging, machining, and inspection.
We offer a full range of threaded fittings — Elbows, Tees, Couplings, Caps, Bushings, Nipples, Unions, and Branch Outlets — designed for use in high-pressure piping systems.
All fittings are produced in accordance with ASME B16.11, MSS SP-79/83/95/97, and BS3799 standards, with pressure ratings of 2000LBS, 3000LBS, and 6000LBS, and available in sizes from NPS 1/8" to 4" (DN6–DN100).
Our materials cover carbon steel (ASTM A105, A350 LF2), stainless steel (ASTM A182 F304, F316, etc.), and alloy steel grades (F11, F22, F91), ensuring optimal mechanical strength and corrosion resistance.
Thanks to our deep manufacturing expertise, rigorous testing procedures, and global supply experience, Maitolead forged fittings are widely applied in oil & gas, petrochemical, power generation, shipbuilding, and industrial piping systems, delivering long-term reliability under high-pressure and high-temperature conditions.
