On April 11, 2025, an old customer from China sent us an inquiry for ASTM A105 Threaded Fittings, which are made of common carbon steel. After receiving the quotation, the customer spoke highly of our professional service and confirmed the order on April 30, 2025. This cooperation further consolidated our long-term cooperative relationship with this old customer and laid a solid foundation for cooperation on more subsequent projects.
ZIZI is a professional manufacturer and processor of pipes and fittings, dedicated to providing high-quality products for core sectors such as chemical, petroleum, natural gas, water conservancy, electric power, and marine engineering. We offer a comprehensive range of pipes and fittings, including seamless pipes, welded pipes, butt-weld fittings, high-pressure forged fittings, and flanges. Crucially, we also possess strong capabilities in producing machined parts, allowing us to customize products to meet specific client requirements. Our materials expertise covers a wide array, including carbon steel, stainless steel, alloy steel, low-temperature steel, duplex steel, and nickel-based alloys, ensuring we can satisfy demanding application needs across various harsh operating conditions.
Purchase List
Since this order contains many products, only a partial list is shown.
| DESCRIPTION | MATERIAL | PRESSURE | END | QUANTITY | UNIT | Remark |
| ELBOW 90°DN65 SCH80 CS | ASTM A105 | 3000# | RC Thread | 6 | PCS | Hot dip galvanizing |
| ELBOW 90°DN50 SCH80 CS | ASTM A105 | 3000# | RC Thread | 36 | PCS | Hot dip galvanizing |
| ELBOW 90°DN40 SCH80 CS | ASTM A105 | 3000# | RC Thread | 10 | PCS | Hot dip galvanizing |
| ELBOW 90°DN32 SCH80 CS | ASTM A105 | 3000# | RC Thread | 120 | PCS | Hot dip galvanizing |
| ELBOW 90°DN25 SCH80 CS | ASTM A105 | 3000# | RC Thread | 65 | PCS | Hot dip galvanizing |
| TEE DN32 SCH80 CS | ASTM A105 | 3000# | RC Thread | 28 | PCS | Hot dip galvanizing |
| TEE DN25 SCH80 CS | ASTM A105 | 3000# | RC Thread | 15 | PCS | Hot dip galvanizing |
| TEE DN20 SCH80 CS | ASTM A105 | 3000# | RC Thread | 5 | PCS | Hot dip galvanizing |
| TEE DN15 SCH80 CS | ASTM A105 | 3000# | RC Thread | 5 | PCS | Hot dip galvanizing |
| HEX NIPPLE DN50x32 SCH80 CS | ASTM A105 | 3000# | RC Thread | 14 | PCS | Hot dip galvanizing |
| HEX NIPPLE DN40x32 SCH80 CS | ASTM A105 | 3000# | RC Thread | 7 | PCS | Hot dip galvanizing |
| HEX NIPPLE DN32x25 SCH80 CS | ASTM A105 | 3000# | RC Thread | 7 | PCS | Hot dip galvanizing |
| CAP DN32 SCH80 CS | ASTM A105 | 3000# | RC Thread | 25 | PCS | Hot dip galvanizing |
Inspection of Threaded Fittings
Surface defects: Check whether there are cracks, sand holes, shrinkage holes, slag inclusions, delamination, heavy skin, depressions, rust and other defects on the surface of the pipe fittings. These defects will affect the strength and sealing of the pipe fittings.
Dimension inspection: Use calipers, vernier calipers, tape measures and other tools to check whether the nominal diameter, wall thickness, length, end face, etc. of the pipe fittings meet the requirements of the design drawings or relevant standards (such as ASME B16.11).
Thread quality: Check whether the thread profile is complete and clear, and whether there are missing teeth, irregular teeth, burrs, knife marks and other phenomena.
Marking inspection: Check whether the manufacturer’s logo, material brand, furnace batch number, size, pressure level and other markings on the pipe fittings are clear, accurate and complete, and consistent with relevant certificates and documents.
What is Hot-Dip Galvanizing?
Hot-dip galvanizing, is a very common and effective method of preventing corrosion on steel. Its basic principle is to dip cleaned steel products into a molten zinc solution, and through the metallurgical reaction between zinc and iron, a dense layer of zinc alloy and pure zinc is formed on the surface of the steel, thus providing protection.
Threaded Fittings Specification
| Size: | 1/4″ to 4″ ( DN6 to DN100) |
| Pressure Rating: | Class 2000, 3000, 6000 LBS |
| Standard: | ASME B16.11, BS3799, MSS SP-79 / 83 / 85 / 97 |
| Type: | Threaded Elbow, Tee, Cross, Cap, Coupling, Boss, Plug, Bushing and Union. |
| Material: | ASTM A105, A350 LF2/LF3, A182 F5, F9, F11, F12, F22, F91, F304/304L, F316/316L, F317, F310S, F321, F347, F904. |
ASTM A105 Threaded Fittings Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Cu | Ni | Cr | Mo | V |
| ASTM A105 | MIN | 0.60 | 0.10 | ||||||||
| MAX | 0.35 | 1.05 | 0.035 | 0.040 | 0.35 | 0.40 | 0.40 | 0.30 | 0.12 | 0.08 |
ASTM A105 Threaded Fittings Mechanical Property
| MATERIAL | T.S (MPA) | Y.S (MPA) | EL % | R/A % | HARDNESS |
| ASTM A105 | 485 min | 250 min | 22 min | 30 min | 197 max |
Common Types of Threaded Fittings
Elbows (90° and 45°) – Used to change pipe direction.
Tees – Allow branching of the pipeline.
Couplings – Connect two pipes together.
Unions – Provide easy disconnection for maintenance.
Bushings – Reduce pipe size.
Nipples – Short sections of threaded pipe.
Caps & Plugs – Seal pipe ends.
Crosses – Four-way connection.
Carbon Steel Threaded Fittings Dimensions+
Elbow & Tee & Cross Dimension
| Threaded 45 Elbow | Threaded 45 ° Elbow | Threaded Tee | Threaded Cross | ||||||||||||
| Nominal Size | Center-to-End | Outside Diameter of Band | Wall Thickness | Length of Thread | |||||||||||
| DN | NPS | A | H | G min | L5 min | L2 min | |||||||||
| 90° Elbows, Tees, Crosses | 45 ° Elbows | ||||||||||||||
| 2000 | 3000 | 6000 | 2000 | 3000 | 6000 | 2000 | 3000 | 6000 | 2000 | 3000 | 6000 | ||||
| 6 | 1/8
1/4 3/8 |
21 | 21 | 25 | 17 | 17 | 19 | 22 | 22 | 25 | 3.18 | 3.18 | 6.35 | 6.4 | 6.7 |
| 8 | 1/4 | 21 | 25 | 28 | 17 | 19 | 22 | 22 | 25 | 33 | 3.18 | 3.30 | 6.60 | 8.1 | 10.2 |
| 10 | 3/8 | 25 | 28 | 33 | 19 | 22 | 25 | 25 | 33 | 38 | 3.18 | 3.51 | 6.98 | 9.1 | 10.4 |
| 15 | 1/2 | 28 | 33 | 38 | 22 | 25 | 28 | 33 | 38 | 46 | 3.18 | 4.09 | 8.15 | 10.9 | 13.6 |
| 20 | 3/4 | 33 | 38 | 44 | 25 | 28 | 33 | 38 | 46 | 56 | 3.18 | 4.32 | 8.53 | 12.7 | 13.9 |
| 25 | 1 | 38 | 44 | 51 | 28 | 33 | 35 | 46 | 56 | 62 | 3.68 | 4.98 | 9.93 | 14.7 | 17.3 |
| 32 | 1 1/4 | 44 | 51 | 60 | 33 | 35 | 43 | 56 | 62 | 75 | 3.89 | 5.28 | 10.59 | 17.0 | 18.0 |
| 40 | 1 1/2 | 51 | 60 | 64 | 35 | 43 | 44 | 62 | 75 | 84 | 4.01 | 5.56 | 11.07 | 17.8 | 18.4 |
| 50 | 2 | 60 | 64 | 53 | 43 | 44 | 52 | 75 | 84 | 102 | 4.27 | 7.14 | 12.09 | 19.0 | 19.2 |
| 65 | 2 1/2 | 76 | 83 | 95 | 52 | 52 | 64 | 92 | 102 | 121 | 5.61 | 7.65 | 15.29 | 23.6 | 28.9 |
| 80 | 3 | 86 | 95 | 106 | 64 | 64 | 79 | 109 | 121 | 146 | 5.99 | 8.84 | 16.64 | 25.9 | 30.5 |
| 100 | 4 | 106 | 114 | 114 | 79 | 79 | 79 | 146 | 152 | 152 | 6.55 | 11.18 | 18.67 | 27.7 | 33 |
Coupling & Boss & Cap Dimension
| Coupling | Half-Coupling | Boss | Cap | |||||||
| Nominal Size | End-to-End | End-to-End | Outside Diameter | End Wall | Length of Thread | |||||
| DN | NPS | W | P | D | G min | L5 min | L2 min | |||
| 3000 & 6000 | 3000 | 6000 | 3000 | 6000 | 3000 | 6000 | ||||
| 6 | 1/8 | 32 | 19 | 16 | 22 | 4.8 | 6.4 | 6.7 | ||
| 8 | 1/4 | 35 | 25 | 27 | 19 | 25 | 4.8 | 6.4 | 8.1 | 10.2 |
| 10 | 3/8 | 38 | 25 | 27 | 22 | 32 | 4.8 | 6.4 | 9.1 | 10.4 |
| 15 | 1/2 | 48 | 32 | 33 | 28 | 38 | 6.4 | 7.9 | 10.9 | 13.6 |
| 20 | 3/4 | 51 | 37 | 38 | 35 | 44 | 6.4 | 7.9 | 12.7 | 13.9 |
| 25 | 1 | 60 | 41 | 43 | 44 | 57 | 9.7 | 11.2 | 14.7 | 17.3 |
| 32 | 1 1/4 | 67 | 44 | 46 | 57 | 64 | 9.7 | 11.2 | 17.0 | 18.0 |
| 40 | 1 1/2 | 79 | 44 | 48 | 64 | 76 | 11.2 | 12.7 | 17.8 | 18.4 |
| 50 | 2 | 86 | 48 | 51 | 76 | 92 | 12.7 | 15.7 | 19.0 | 19.2 |
| 65 | 2 1/2 | 92 | 60 | 64 | 92 | 108 | 15.7 | 19.0 | 23.6 | 28.9 |
| 80 | 3 | 108 | 65 | 68 | 108 | 127 | 19.0 | 22.4 | 25.9 | 30.5 |
| 100 | 4 | 121 | 68 | 75 | 140 | 159 | 22.4 | 28.4 | 27.7 | 33.0 |
Application of Carbon Steel Threaded Pipe Fittings
Low-pressure and medium-low-pressure piping systems: They are often used in systems with relatively less stringent pressure and temperature requirements.
Water treatment and water supply and drainage systems: Common water supply, drainage and fire protection pipelines.
Gas pipelines: They are also used in some low-pressure gas transmission pipelines.
Light industry and civil construction: Suitable for general industrial fluid transportation, heating, ventilation and air conditioning (HVAC) systems and residential pipelines.
Systems that require frequent disassembly and maintenance: The characteristics of threaded connections make it easy to disassemble and replace, which is convenient for maintenance.